hybridfree/eevblog-posts huggingface dataset:
Owon TDS8204/PeakTech 1300 repair - Page 1
Forum section: electronics / repair

author: ra-ma
author_rank: Contributor
timestamp: March 28, 2024, 01:05:48 pm
content: Hello, I got a PeakTech 1300 aka Owon TDS8204 oscilloscope from my father in law. Issue description is "stuck in boot screen".To check if it's potentially the power supply, I connected the main board directly to my lab power supply, skipping the internal power supply: The board takes 3 amps at 5 volts. It starts, shows the PeakTech logo but nothing more. So exactly same behavious as with the internal power supply.In the input area of channel 2 I found a burnt 50 Ohms resistor (see picture) which I already swapped with a new one, but no change.I was checking around that area for issues, but can't find anything:- NEC relays are fine as far I can tell (measuring resistance between pins 1 and 8, unsoldering the one close to the burnt resistor, applying 4.5 volts, it's closing/opening).- The battery (MS621FE) only has 2.5 Volts. I added another one in addition with 3.1 volts but no difference.Any ideas where to look? Could it be more a soft- or hardware issue? Unfortunaltely I can't find helpful material online, doesn't seem to be a well selling oscilloscope...I don't know the boot sequence of the Owon. My Rigol does some relais clicking at the end of the boot sequence, the Owon does a click (sound like several relais are switching) at the moment it gets power. Afterwards nothing happens anymore...Looking forward for any tips and ideas.

author: m k
author_rank: Super Contributor
timestamp: April 02, 2024, 02:32:42 pm
content: Maybe battery voltage was too low, settings disappeared and the machine doesn't know how to boot.
OWON XDS3202A need a dump NAND - Page 1
Forum section: electronics / repair

author: Kirill0502
author_rank: Newbie
timestamp: August 12, 2022, 01:38:11 pm
content: OWON XDS3202A oscilloscope turns off by itself 10 seconds after startup, shows the OWON picture and turns off.Does anyone have a firmware or can someone take a NAND memory dump?
Owon XSA815-TG - Page 1
Forum section: electronics / repair

author: XTEC
author_rank: Contributor
timestamp: May 13, 2024, 04:14:11 pm
content: Anyone bought one of these SA's? Any good? Price is very attractive, but almost too cheap... about US$1K. Hummm. But then I don't need the best SA ever, just something on a budget for some basic EMC pre tests (which is seems this model includes).I was looking at the Rigol DSA800 series, but once you add the EMC kit it's getting up above US$2K. I'll spend that if necessary, but just wondering how the Owon is?
OwonHDS242S  - Page 1
Forum section: electronics / repair

author: gupa
author_rank: Newbie
timestamp: September 17, 2024, 10:28:38 pm
content: Hello, I'm new here, so please excuse any rudeness if I commit it. I managed to cancel one smd component on the output of the signal generator marked 52 and the E placed next to it. I guess it is a protection component and size is 2,9x1,6mm:https://www.s-manuals.com/pdf/datasheet/d/t/dta123ye%2C_dta123yka%2C_dta123ysa%2C_dta123yua_rohm.pdfProblem and question. I can't find a part or equivalent to buy. If you were to solve it, how would you solve it?I thought of finding a similar PNP transistor and adding two resistors. Is this the right way? Is there any other solution to fix the generator?Or I'm wrong and the component at the signal output is something completely different than a transistor.Thank you and greetings from the Czech Republic

author: tatel
author_rank: Frequent Contributor
timestamp: September 18, 2024, 05:40:53 am
content: https://www.eevblog.com/forum/testgear/owon-hds-200-handheld-oscilloscope-w-builtin-dmmawg/msg5507536/#msg5507536

author: gupa
author_rank: Newbie
timestamp: September 18, 2024, 06:19:02 pm
content: Sorry, it won't be a transistor, I had a better look at the description of the component on the PCB and it is D11, so it will be some kind of diode. What index do you use to search for SMD codes? So far I have no success, I am searching by component size.
OWON/Lilliput TDS8104 firmware/dump - Page 1
Forum section: electronics / repair

author: sad_m0nk3y
author_rank: Newbie
timestamp: June 30, 2020, 07:42:53 pm
content: Ok, i will make it quick - i need firmware file or firmware dump for tds8104(actually any additional info on the scope would be sweet as well, like board photos, maybe some info about straight analogue from siglent(since i am aware that they sell some siglent rebranded scopes)To the story behind this, so recently i stumbled upon a sweet deal on owon tds8104(like 250$), however this particular unit has some problems with firmware(it doesn't boot, and it spits out an error in uboot when you try to get the info on the jffs2, which probably means that nand chip is damaged, since the seller says that the unit never was successfully flashed). I tried contacting owon to provide me with some known good firmware on their part, since their website doen't have firmware updates for that scope, but they failed to respond. The seller actually provides mtd dumps of the tds8204 nand(200mhz version, however he says that they are problems with flashing them via uboot, as you can clearly guess it's a dump of a linux distribution that this things runs on, not fpga configuration, i doubt it is broken, but it would be still nice to have a dump of the fpga configuration).Thanks in advance everybody.P.s. Yes i know of the ds1054z, but compared to this one - it has lower sample rate(2ghz vs 1 ghz), it has only 250 Mgs /s in 4 channel(where this puppy packs 1gs/s in 4 channel mode), it has less waveforms/s(30k on 1054z vs 50k on this fella). And yes i am aware of it's shortcomings like bad firmware, less math functions, no clever memory tricks, less memory in general, no digital phosphor and no equivalent mode.
[Solved] P2/P3 Motherboard standby power issue - Page 1
Forum section: electronics / repair

author: spilihps
author_rank: Regular Contributor
timestamp: March 23, 2024, 05:27:27 pm
content: Hello,Pulled out a P3 rig from storage to play around with. Noticed that as soon as PSU is connected power "leaks" in standby, causing CPU and GPU fan to run for example.Power LED in front is also lit, but very dim. Likewise using a postcard the power indication LEDs on that is also lit, but very dimChecked the PSU, and it is not providing anything more than the +5VSB as it should.System power on and works as normal.To me it seems like the VSB on the motherboard is leaking to other rails for some reason. I did not want to keep it plugged in more than necessary with this issue.Any tips or hints what might be the cause, or what to check?The motherboard model is unknown, it only has "INTEL BX-B" written on it. Its one of these built to order boards from late 90s.I actually have two of these boards, one that failed in a worse way, but it was saved in this thread:https://www.eevblog.com/forum/repair/broken-ic-on-old-pentium-2-motherboard/I attach a image of the board for identification.

author: m k
author_rank: Super Contributor
timestamp: March 29, 2024, 02:11:59 pm
content: What voltages those other pins have?VSB is very small, it can't really do anything.Maybe one low current voltage is on, so regulation is not really starting around other higher current voltages.

author: amyk
author_rank: Super Contributor
timestamp: March 29, 2024, 08:17:49 pm
content: What does the BIOS POST screen show? That should help identify the model.As for troubleshooting the actual issue, "BX-B" suggests this is one of the many mobos based on the famous 440BX chipset, for which the reference schematics are easily found:https://elektrotanya.com/intel_440bx_rev_1.0_sch.pdf/download.html

author: coromonadalix
author_rank: Super Contributor
timestamp: March 30, 2024, 10:24:43 pm
content: 1st: check all caps on the mobo if they are inflated,2: the psu in theses must be very old ... it would be normal to have caps failing in it ...for tests, you remove the psu form the mobothe only power you should have is the 5vdc standby pin / power pin active, you ground this pin and the psu should come alive, should be the green wireyou have many 20 pins atx psu pinouts on the web to cross check the voltages, but at some point you need to check if you have ac noise / voltages not filtered correctly coming from the psu, a scope would helpthe psu would be the 1st part i would change if the mobo caps are not buldged ( they seems fine from the photo ? )

author: spilihps
author_rank: Regular Contributor
timestamp: April 01, 2024, 06:38:16 pm
content: Hey everyone!Thanks for your help so far!However, It turned out to not be the motherboard at all, but a pretty weird issue with the PSU.Opened up a new thread on the forum for this, as it is a completely different topic all on its own.https://www.eevblog.com/forum/repair/atx-psu-ps_on-issue/
P440C07 Datasheet - Page 1
Forum section: electronics / repair

author: TobiasG
author_rank: Contributor
timestamp: January 12, 2024, 02:27:02 pm
content: Hello all,could anyone help me to find the datasheet of P440C07?I found a lot to sell, very easy to find in internet, but datasheet I can't find.

author: TobiasG
author_rank: Contributor
timestamp: January 15, 2024, 12:32:35 am
content: one more information, the manufacturer is "TYCO"

author: amyk
author_rank: Super Contributor
timestamp: January 16, 2024, 03:37:42 am
content: Quote from: TobiasG on January 15, 2024, 12:32:35 amThey're now called Vincotech so you could try asking them:https://www.vincotech.com/
P51 Lenovo keyboard righlt alt key phantom press after boot into W10 - Page 1
Forum section: electronics / repair

author: Zucca
author_rank: Unknown
timestamp: November 21, 2023, 04:43:47 am
content: I don't know if this is the right place, or maybe the computer section was be better.Anyway this one is big puzzle for me.What is the problem:Left alt key is being registered as pressed even when I do not touch the key.Frequency: 1 phantom press every 5 to 1 sec, it varies and only God knows why.When it happens:Only sporadically (2/3 times every 10 startup) after W10 is booted up from turned off machine.When I reboot the problem never happens again.BIOS diagnose always passes: no phantom presses during the BIOS Keyboard diagnoses...How to resolve the problem:Press right alt once for real, and everything goes back to normalRight alt key feels normal and equal to the left one. I even disassemble it and could no find anything wrong with it.Problem started 1-3 months after I swapped the keyboard from German Layout to English one.I can't wrap my mind on this one. If the keyboard is bad why can't be reproduced in the BIOS diagnose?How can be the Windows operating system is responsible for the problem?WTF?

author: p.larner
author_rank: Frequent Contributor
timestamp: November 21, 2023, 06:32:12 am
content: try another kb if you can and try it.
SMART TV memory upgrade - Page 1
Forum section: electronics / repair

author: bitcom
author_rank: Newbie
timestamp: February 02, 2020, 05:30:11 pm
content: Hi everyone, I was given a 32 inch tv with a dead mother board.Specs here:[https://www.kazmielecom.com/2019/05/12/onida-leo32hain-smart-tv-software-free-download.html/url]I have already ordered a new one but have not yet received it.This board being a android based I want to run MOBDRO on it, however MOBDRO requires 1G ram to run, and this board only comes with 512MB RAM.On closer look of the board it has this 2 pcs H5TQ4G63CFR which are indeed 4Mb chips from Hynix.I figure one is used for main memory and the other one for display memory.Anyway my question for the experts here comes to the following.I was unable to find an exact match for a 8Gb chip from Hynix, the closest one comes to be: H5TC8G63AMR which has the same bank arrangement with a minor difference in voltage (1.35 vs 1.50) but I guess that is not a problem the main problem I can see is that this chip is a DDP dual die package intead of the SDP on the original chip even though they are both 96 ball packages.So the question becomes can I use this chip to upgrade to 1GB ram.Thank you all for you support, I'll really appreciate your input.Luis
PA Amplifier MWL-5E/200 Repair Advice 2 - Page 1
Forum section: electronics / repair

author: Legoman
author_rank: Newbie
timestamp: October 11, 2021, 03:22:39 pm
content: Hi,here's the second part of my previous post.2.) Circuit understandingTo get a better understanding I tried to mark up the different sections of the circuit to the best of my knowledge.Probably I got it terribly wrong. If someone can spare some time to comment on my assumptions, this would be great.Please check attached:Schematic_Amp_Input_Stage.pdf(1238.42 kB - downloaded 69 times.)Schematic_Amp_Final_Stage.pdf(985.96 kB - downloaded 82 times.)Schematic_Amp_Final_Stage.pdfSchematic_Amp_Input_Stage.pdfthanks for all help.If any info is missing, please let me know.Johannes
Pace MBT350 firmware help - Page 1
Forum section: electronics / repair

author: lotsapins
author_rank: Newbie
timestamp: March 26, 2021, 01:01:11 pm
content: Looking for the firmware for a Pace MBT350. I have several and the newest one has 2.5. I can burn a eprom, but can't find any files.

author: Shock
author_rank: Super Contributor
timestamp: March 27, 2021, 10:39:46 am
content: Contact Pace, I doubt they ever distributed the files. Consider though there could have just been small changes due to specific customer requests in the last few releases. It's likely been feature complete and stable since your stations were sold (over a decade ago).

author: lotsapins
author_rank: Newbie
timestamp: March 28, 2021, 02:46:30 pm
content: Pace does not reply. I have since opened one and it is a square chip in a socket that has the firmware on it, so I will likely have to buy new chips with the latest firmware. Just need to know where to get them.

author: RayRay
author_rank: Frequent Contributor
timestamp: March 28, 2021, 04:46:30 pm
content: Well, if Pace doesn't reply, then your out of luck (couldn't find anything on Google). But that said, I'm curious as to your reasoning on this matter! Is there a specific reason why you'd wanna update the firmware? If not, maybe you should just let it go.

author: lotsapins
author_rank: Newbie
timestamp: April 02, 2021, 09:27:11 pm
content: Looks like i will let it go. Had 3 stations for sale and they sold. Only reason would be to update my own , and it has 2.5 and works fine.
Pace SX-80 heater connector problem - Page 1
Forum section: electronics / repair

author: Phaseseeker
author_rank: Regular Contributor
timestamp: April 25, 2023, 08:17:36 am
content: I have a Pace SX-80 desoldering gun with an open heater wire; taking it apart, turns out the insulation on the (nichrome?) heater wire is crumbling apart allowing the two heater connections to short out and that has melted the connection near the crimp. I can reconnect it but, how can insulate the two wires again? On the part going to the connector, I could just slide on one of those fiberglass sleeves, but (see picture) on the part that's wound around the heater tube I really can't do that. I thought about replacing the whole thing with new insulated nichrome wire but I'd prefer avoiding messing with it... (also, the spare part is available from Pace, but 130€ for a heater seems a bit steep)Thanks in advance

author: tooki
author_rank: Super Contributor
timestamp: April 25, 2023, 01:08:15 pm
content: How much is your time worth? And how much do you care for this piece of fine equipment? I would just spend the 130 euros and get a new heater — you should get the upgraded SX-90-style heater, which will allow you to use the superior SX-90 tips. (Your existing SX-80 tips remain compatible.) The part number stayed the same, so any spare you get now should be the SX-90 style.Also, make sure the heater connector color matches: Ithinkthe SX-80 always has a black connector, but make sure. Early SX-90 also had black, but later SX-90, and the SX-100, use a blue connector. (This is about the color of the internal heater connector, not the DIN connector on the cable.)Black connector heater: 6010-0107-P1Blue connector heater: 6010-0163-P1Also, given the heat damage you have, I would also make sure the heater connector in the handpiece isn’t damaged.
PACE Thermoflo TF 1700 unit repair - Page 1
Forum section: electronics / repair

author: saveme
author_rank: Newbie
timestamp: February 13, 2025, 10:38:50 pm
content: I have recently gotten into the possession of one of these units which is missing the pc and the power switch. I have reached out to pace and was given some software but they let me know it was an end of life product with no support as nobody who has handled this bga machine works there. I am aware that there is a matrox gpu that came with the unit but there is no information on models beyond that I received. The only information I can currently find is the manual and a video on youtube that doesn't give me much in terms of getting this up and running. Upon plugging it in and turning on the rear switch i get no feedback of any sort. If theres anyone familiar with this unit that can help me trouble shoot I would majorly appreciate it.

author: asis
author_rank: Frequent Contributor
timestamp: February 16, 2025, 08:45:11 am
content: Hi,On which PC did you try to install the SW you got from PACE and on what media CD/FDD or WinRAR?

author: dxhydro
author_rank: Newbie
timestamp: October 18, 2025 02:13:05 am
content: Hello - I bought a TF1700 from University of Iowa a while back but the PC had been removed. Per university policy they always wipe PC's but I wish they had at least kept it with machine so I don't have to locate the Matrox card...The software would be a good start and I was able to locate the Matrox unit on eBay but have since forgot the model number/If I could get a copy of the software I'd appreciate it. And will keep you updated on progress of getting uniot uip and running.Thanks, Dan Weddle - Burlington, Iowa

author: Paceguy
author_rank: Regular Contributor
timestamp: October 18, 2025 10:40:29 am
content: Hi, Have you tried contacting Matrox directly to try to get that card?. They are located in the Montreal, Quebec, Canada area. 1055 St-Regis Blvd., Dorval, Quebec, H9P 2T4, phone # 514-822-6000 sales @ 514-822 6364. I would suggest contacting them, it's possible they might be able to help you out or at least point you in the direction of finding what you are looking for.
Pace Thermojet heater assembly smoking - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: September 01, 2020, 08:33:34 am
content: I just got a thermojet from ebay and first try it heated well but also smoked a bit. Looking inside the heater assembly could not see any thing burned or melted. And the smoke seems to come from inside the heating element.I left it on for around 5min. Heating well and smoking a bit. If the element was really shorted it would not provide 5 min of stable heatingI will get back to the seller for sure.But interested to know if that is how Pace heating elements fail. I never had a soldering iron smoking the element before failing.

author: perdrix
author_rank: Frequent Contributor
timestamp: September 01, 2020, 09:17:43 am
content: If that was a small amount of smoke and it was new or "new old stock" then it may just have been protective grease or similar burning off.Does it still get hot?David

author: gkmaia
author_rank: Frequent Contributor
timestamp: September 01, 2020, 11:14:16 am
content: Yes gets hot as it should.It seems to be new as the assembly has no heat coloration, plastic looks new no dirty or scratches.Maybe should I just let if on for 30 min and see if it burn it off?

author: Squoip
author_rank: Contributor
timestamp: September 01, 2020, 04:41:09 pm
content: If it's new, it is normal for some smoke to be emitted when it's first heated up. Pace has a burn-in procedure for it. 600F for 10 minutes, then 800F for 15 minutes. After that, should be no smoke.
Packard-Bell Model 621 Radio Ground Safety - Page 1
Forum section: electronics / repair

author: Scottman
author_rank: Newbie
timestamp: September 27, 2020, 08:03:00 am
content: I am starting into electronics, emphasis on old radios. I was given the PB Model 621 but was told to be very careful since I would have a 50-50 chance of plugging it in and having the chassis be hot. Given that, is there a way to change the power cord and have one with the larger spade to minimize this potential hazard? Bottom line is I don't want to kill myself when I plug the radio in. Thanks for being here as I just found this site and joined.

author: iteratee
author_rank: Contributor
timestamp: September 27, 2020, 09:08:53 am
content: It's using a shared chasis-neutral. You need to separate them so there's a dedicated earth ground and have the chasis connected only to earth, not neutral. This is rather critical to fix before use.
Pairing extra headphone to Sony MDR station - Page 1
Forum section: electronics / repair

author: sairfan1
author_rank: Frequent Contributor
timestamp: April 25, 2019, 10:41:50 pm
content: Hi I have a Sony MDR-6500 headphone, i want to include an other headphone so that at a time two persons can listen.Is it possible that pair extra same Sony MDR-6500 headphone with my existing MDR-6500 base unit? so that it transmit to both units at same time.Thanks,

author: Psi
author_rank: Super Contributor
timestamp: April 25, 2019, 10:45:25 pm
content: Looks like nohttps://community.sony.ie/t5/portable-audio/mdr-ds6500-multiple-headsets/td-p/2293665
Panasonic 40PFL5606H/58 LED TV low standby voltage? - Page 1
Forum section: electronics / repair

author: szevlin
author_rank: Newbie
timestamp: November 24, 2020, 08:37:02 pm
content: I got a Panasonic tv from the trash, it looked like it was in pretty good condition, at first I couldn't power it on, only the standby led was on, and the capacitive touch buttons didnt work, also it drew 20 watts,then when i restarted it, it started working, and it worked normally on 1 occasion, then i restarted it and it didnt work again, not a single time,so it seemed like it is completely random if it worked or not, then i saw that I needed to heat up the main chip with a halogen lamp to make it work so i gave it a try,(i covered the other components with aluminium foil to shield them from the heat)it didn't fix the problem but the tv only draws 12 watts now for some reason, and the standby led doesnt power on anymore, did I kill the tv?I measured the power supply voltages and they all seemed fine, except the standby voltage which was 2.6 volts when I removed the psu from the main board and it dropped to 1.4 volts when i connected it back, but strangely there wasnt any current going in the wire, i could measure it with a clamp meter with 1mA resolution and it was 0.also there was a "3v3stndby" pin as well and i was measuring 3.3 volts on it so it seems fine, something I dont understand is why are there 2 seperate voltages for standby?I dont know where to look for problems, it can be a power supply issue or maybe a main board issue? (but again why did it work completely fine on 1 occasion, then it can't be the power supply right?)(sorry for my bad english)

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 24, 2020, 09:37:56 pm
content: Philips?

author: szevlin
author_rank: Newbie
timestamp: November 24, 2020, 10:25:53 pm
content: yes its Philips sorry its late at night, i tried to delete the post but i couldnt so i created a new one
Panasonic Air Con - Page 1
Forum section: electronics / repair

author: iwack
author_rank: Newbie
timestamp: September 21, 2019, 09:13:05 am
content: Hello,I have come across a Split Air Con which in heating mode interrupts operation and stops working and in cooling mode the power surges up and down.The self-diagnosis indicates a H98 error which the Service Manual describes as: "Indoor high pressure protection", "Air circulation short circuit".Below are photos of the power board. Anybody know which components most likely needing replacement? I'm curious to see if I can find it.Regards,

author: Psi
author_rank: Super Contributor
timestamp: September 21, 2019, 09:46:56 am
content: I could be wrong but it sounds more like a refrigeration hardware/sensor issue than a PCB issue.

author: iwack
author_rank: Newbie
timestamp: September 21, 2019, 10:09:54 am
content: I tried warming the power board with hot air blower a couple of times and the problem usually went away.

author: Electro Detective
author_rank: Super Contributor
timestamp: September 21, 2019, 10:57:26 am
content: It looks to me that some of the soldering in the lower right hand side of the uppermost/top/first photo may have a joint or three with cracks,which may explain why the 'problem' goes away when hit with a hot air blower = the cracks expand and close up slightly just enough to make contactMight be worth a closer looksee
Panasonic BT-S1050Y CRT makes sparking noise turns off immediately - Page 1
Forum section: electronics / repair

author: Lilyu
author_rank: Newbie
timestamp: March 27, 2025, 11:13:57 pm
content: Hey,I was searching all over the web to find any place that might be able to help me in regards of my old Panasonic crt monitor.The main issue with this display is that it doesn't turn on, whenever connected to 220V power source the power led turns on for a second and then turns off nothing more.This display has 12v battery input that i can also hook up to external power supply to see if it works but to no avail whenever i turn on the power the unfortunate ticking noise can be heard from the flyback area of the tvSo far i have opened up the display itself not too dusty(definitely will take it apart later for a deep clean), whenever i am trying to discharge the tube there's no spark so i presume the fbt doesn't generate enoug power? or is it shorted somewhere so the flyback doesn't get enough power to begin with?Would anyone have any idea? i can post the video of the noise the unit makes when connected to reasonably stable 12v power

author: cte
author_rank: Regular Contributor
timestamp: March 30, 2025, 09:59:57 am
content: While searching for a schematic I found you already asked for help in another forum...https://forum.vcfed.org/index.php?threads/panasonic-bt-s1050y-crt-turns-off-immediately.1251270/Please don't attempt any further repair.This device operates with high voltages and you seem to lack some basic knowledge about electronics and especially the theory of operation of CRT TVs.
Panasonic CF-54 Toughbook Mk ii Repair and Maintenance Manual - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: April 08, 2025, 10:18:46 am
content: I know that this has escaped into the wild, but I can only find dead links to it.Can anyone point me to the right place?ThanksDavid

author: amyk
author_rank: Super Contributor
timestamp: April 08, 2025, 10:57:46 pm
content: https://elektrotanya.com/panasonic_cf-54d0001zz.pdf/download.html?

author: perdrix
author_rank: Frequent Contributor
timestamp: April 09, 2025, 11:58:32 am
content: Thank you loads - it is for the mark I AFICT, but it will by far be better than what I had before!!!A great pity it only contains parts explosions and parts lists but still better than naught!David

author: perdrix
author_rank: Frequent Contributor
timestamp: April 10, 2025, 07:39:15 am
content: Does anyone know of any other repair level documents for these laptops?Thanks a lot.David
Panasonic DECT phone Base Station - Page 1
Forum section: electronics / repair

author: tchoy668
author_rank: Newbie
timestamp: January 09, 2023, 09:33:01 am
content: I have a Phansonic KX-TG2512CX DECT phone system with 3 phone set.recently the base station just generate the alarm call signal without anyone press on it.how to resolve it, thank you

author: MathWizard
author_rank: Super Contributor
timestamp: January 09, 2023, 05:34:25 pm
content: So do you mean there's a button on the base station, that press to make the phone ring ?If so you could try taking it apart and clean the button. There could be some bad voltage/noise on the button too.Then there's way worse problems, like something going wrong inside some micro-controller or similar chip.I haven't taken a cordless phone apart before, but I bet they are a nightmare of micro parts, and micro soldering. And IC's with phonebook sized manuals.
Panasonic DLP Connector identification (PT-DZ13K) - Page 1
Forum section: electronics / repair

author: ianscott
author_rank: Contributor
timestamp: August 28, 2023, 01:16:15 pm
content: Hello AllGot a Panasonic PT-DZ13K projector with a damaged connector on one of its DLP modulesI have attached some photos of the connector the damaged one and the same type on the main controller PCBCan anyone identify what the connector is?Or if anyone has a service manual with that info that would be great also!

author: wasedadoc
author_rank: Super Contributor
timestamp: August 28, 2023, 02:00:13 pm
content: I cannot help with identifying the connector but have some advice if it must be removed and discarded. As a first step, use a Dremel type tool with rotary cutting blade to cut throuugh all those tails between board and connector body. Then use the same tool to cut through the metal body close to where each tab is soldered to the board. Lift the bulk of the connector away and individually desolder the remains of each pin and tab.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 28, 2023, 02:22:55 pm
content: i would only use hot air station only,using rotary tool may or could create mechanical stress ....my 2 cents
Panasonic DMC-GX1 camera crash - Page 1
Forum section: electronics / repair

author: vgamesx2
author_rank: Regular Contributor
timestamp: October 14, 2021, 12:47:35 am
content: Hi, I got this camera as broken/no power, after taking it apart I happened to put the battery in and was rather surprised to see it turn on, after putting it back together I couldn't get it to power up again and after playing with it some more I had thought that I had a ground issue with the case (it's entirely metal) but upon further testing I'm fairly certain that the memory chip has cracked solder joints, if I apply some pressure then it will refuse to power on which at least explains why it works without the case and doesn't when the case is put on, but I would like to know what you think? Should I just go ahead and make an effort to reflow it or do you think there could be another issue?I've attached a photo of the chip, looks like an hb01c08150-f and I also made a quick demonstration of my problem here:https://youtu.be/6iUqMlOTwdUWhat I'm doing is very gently tapping the Panasonic processor then moving up to the memory chip, I'm hesitant to reflow it since of course if I screw it up, finding a replacement would be near impossible.
Panasonic EP30004 massage chair with motor issues - Page 1
Forum section: electronics / repair

author: Puffie40
author_rank: Regular Contributor
timestamp: January 02, 2022, 05:19:59 am
content: My coworker has a Panasonic EP30004 massage chair that has started acting up on him. Basically, the chair shuts down in the middle of moving the massage block - the voice system announces "The massage is ending", then beeps about 5 times. You then have to press the power button again to turn it on. If a program is not selected, you can operate the recliner functions with no issues.I've narrowed the problem down to the "Width" mechanism - the width motor will move the rollers outward until they lock and the belt starts slipping, then the controller shuts down. If I manually rotate the width mechanism to the narrowest position and begin a program, the rollers will once again move to the furthest position and slip the belt. (I have not tried this with me sitting in the chair)so my question at the moment is would this be a belt or width sensor issue? I found a service manual for an EP30006 (https://www.manualslib.com/products/Panasonic-Real-Pro-Ultra-Ep30006-55068.html), and while Panasonic's service manual has pretty good detail on dismantling the machine, there is not must detail on how the sensor systems work. There is a section on page 50 on testing the output of the sensors, so Im going to try that tomorrow.

author: mike01101011
author_rank: Newbie
timestamp: February 07, 2024, 10:10:22 pm
content: Hi Puffie40,Thanks for making this post. I’m having a very similar issue with my EP30004 lounger.Toward the end of the back scan, with the massage heads at shoulder height; the heads begin to tap quite intensely, the unit emits a series of beeps / announces that the massage is ending, and the chair shuts down.Were you able to find a solution? Did it end up being a belt or sensor issue?Please let me know,Mike

author: Puffie40
author_rank: Regular Contributor
timestamp: February 12, 2024, 07:08:03 pm
content: Hi Mike,I had purchased a replacement position encoding strip for the back massage unit, removed the module from the back to install it, and it seemed to work properly after I reassembled it. I didn't see anything wrong as the old encoder strip was still in good shape, and didn't need to do any electronic repair. My guess is some lint was blocking the optical sensor so it could not read the encoder strip.I did replace the belt as well - it was pretty worn and seemed to slip easily, but I don't think that was the issue.I should also note the EP30004 appears to be an economized EP30006, so the directions provided in the manual I found will also work with your model.
Panasonic EY0L82 Charger Repair // SMD Diode recognition - Page 1
Forum section: electronics / repair

author: olliisit
author_rank: Newbie
timestamp: August 18, 2020, 06:15:13 am
content: The Primary side on these Charger has been blown.Defective: FA13845P (Fuji Controller),FQPF8N90C,....But also these Diode - [Marking "FD"] - as seen in attached Photo.I am searching for the Type of these Diode.The following Diodes would fit to the marking Code,I have checked the datasheets,but NONE of these Diodes (according to datasheet) have the 3 Stripe Cathode Band as seen in Photo.Any suggestions ?----------------------------------Datasheets i have/checked :BZT52B... (Taitron)KDZ33B (Rohm)MM3Z2B... (Zowie)P6SMBJ (Littlefuse) [different Package]PZU...B (Nexperia)STZ8.... (Semtech+others)
Panasonic Industrial Europe ETX1EZ714MEA-C power supply - Page 1
Forum section: electronics / repair

author: FenixEletronica
author_rank: Newbie
timestamp: September 09, 2024, 11:44:05 pm
content: Hi everyone!My first interactiona here.Does anybody have any information on Panasonic Industrial Europe ETX1EZ714MEA-C power supply?Anything such as power on connection, diagrams, parts of diagram, anything that could give me some tips how it works.I have already found the 24VDC section failures and some components I can replace from a dead one - dead means there is an issue on some tracks that cannot be fixed and the whole set is scrap.Thank you.Lima
Panasonic JU 253 troubleshooting help needed - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: April 26, 2020, 01:30:02 am
content: Hi, I got a Panasonic JU 253A drive that is not being able to read or write data.It spins, head moves, mechanically is seems to be all operational. But the logic side is not.I've attached a bunch of scans of the main signals sent from and to the drive. Also the service manual for the 253/257 series.I just would like to ask if any of you see any signal that do not seem right. Or based on the signals if we can pin point the issue to heads, controller, etc...
Panasonic Microwave Door Monitor Switch Annoyance - Page 1
Forum section: electronics / repair

author: EHT
author_rank: Frequent Contributor
timestamp: June 08, 2022, 11:41:00 pm
content: Hi everyone, I wonder if anyone has had this annoyance before and fixed it for good!?I learned that it is a common design for microwave ovens to have three door switches, one of which is a protection mechanism wired as a dead short (referred to as the monitor switch). In series there is a 10A time delay fuse. The plastic bracket these switches are mounted on accommodates some adjustment and is meant to be adjusted such that the door is firm and the switches operate together. However, it is pretty wobbly and crap.What I’m finding is that intermittently this fuse blows when operating the door, not related to using the oven itself. Initially I found the plastic bracket holding the switches was loose and I’m sure the fuse blowing is just related to these door switches. I thought a good way to test it is to detect a short with DMM on continuity but I haven’t managed to replicate it. Maybe the switch contacts could get damaged with the shorting but they test OK. Anyone come across this?The oven is Panasonic NN-CT579S, service manualhere

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: June 13, 2022, 02:58:51 pm
content: Yes. Correct and guilty on both charges... Wobbly, and Crap.My co. threw away a bunch of these ovens. Managed to get one woking and another for spares.
Panasonic p42st30 part number i need help finding - Page 1
Forum section: electronics / repair

author: Doolittle
author_rank: Newbie
timestamp: October 26, 2020, 08:55:34 pm
content: I’m in the u.s. and Panasonic no longer sells their TVs over year or support them. I’m looking for a part number for q501 on the ysus board (it was in pieces and thus no print. I think it’s some sorta duel transistor with 5 leads. Any help would be appreciated.

author: KevinA
author_rank: Regular Contributor
timestamp: October 26, 2020, 10:46:19 pm
content: The service manual lists it as part number B1HFPFA00001, nothing more. Listed on the web as a DAF30You may be better off looking for a YSUS board repair kit for the set, as this will include the part, and all the other bits it blows up

author: Doolittle
author_rank: Newbie
timestamp: October 27, 2020, 10:45:13 pm
content: I did and it’s not a compenet. Thank you.
Panasonic PV-1265K Playback Problem - Page 1
Forum section: electronics / repair

author: HarukoVCR
author_rank: Newbie
timestamp: June 21, 2021, 11:09:43 pm
content: Hello, Been a fan of EEVBlog for a while, and since I know he has looked at various old and unique electronics that I thought I would ask for help from this forum.I bought a Panasonic PV-1265K from a thrift store, it wasn't in very good shape, the front plastic was damaged and was quite dirty, I bought it because in my area you rarely get anything interesting, plus it came with the original remote and even instruction manual. When I first turned it on, nothing about the playback mechanism worked, all that worked was the power and the clock. I did the standard troubleshooting, I replaced the majority of the belts on this unit that was suspect, although in this case surprisingly all the belts were intact and some of them were even still okay, which is surprising for such an old VCR. I believe the original owner attempted to fix this haphazardly, which caused the damage to the front plastic. I re-greased all the areas that needed grease, right now I am in the middle of cleaning all of the rubber parts inside the VCR. As of right now I got decent Fast Forward operation, and the Rewind is at least attempting to rewind, however playback is still a mystery to me. The VCR takes in the tape no problem, and takes the tape to the video head without any issue, however the moment it tries to play, it struggles, and the already played tape doesn't go into the end spool of the cassette and just spews out into the open, until the VCR stops and ejects the tape, it doesn't eat it or anything. While fixing it, I discovered a random spring that came out, I tried to find a service manual for the unit, but I couldn't find a free one to see if this spring is apart of the system.I will attach photos, any help is appreciated. Thanks in advance, have a wonderful day everyone.
Panasonic Relay Marking - Page 1
Forum section: electronics / repair

author: chick0n
author_rank: Regular Contributor
timestamp: December 29, 2023, 08:05:28 pm
content: HiIm wondering about Panasonic / Nais brand Relay markings.For example, there are RF-Relais marked:RK1-L2-5V, but some are marked RK1-L2-5V-H51, or RK1-L2-5V-H23.What does the "H" marking mean? I couldnt find any information in the datasheets.I also found this on other series from panasonic: JJM2W-12V, JJM2W-12V-H52...

author: chick0n
author_rank: Regular Contributor
timestamp: December 30, 2023, 11:02:32 am
content: I found this:https://forum.digikey.com/t/panasonic-hxx-suffix-information/1909"the Hxx suffixes are custom parts and the part numbering is not standardized. This can be a simple as a custom part marking and can be more complicated with plated up/down version or high temp epoxy. It is possible that the standard part will work, however if for example it is a high temp epoxy the replacement part may not be suitable for the application."
Panasonic RF-562DD2 AM\FM receiver, distortion - Page 1
Forum section: electronics / repair

author: xavier60
author_rank: Super Contributor
timestamp: March 09, 2025, 11:16:39 pm
content: In case this becomes useful to others.New, out of the box, it had harsh, scratchy audio. Sounded like speaker rattle.After ruling out a speaker fault, found it was crossover distortion.Replacing its LM4990 audio amplifier IC didn't help.Although there's no mention in the data PDF, I have come to the conclusion that the IC has inherentlyhigh crossover distortion and relies on large negative feedback to minimize it.The IC consists mainly of 2 power opamps, bridged. The application schematic shows the master configured for unity gain.In the radio, it's configured for 70.Reducing the gain to 4.7 reduced the distortion to inaudible level but greatly reduced the volume control range.I changed R53 from 680Ω to 10K.
Panasonic SC-PT470 home theater - Page 1
Forum section: electronics / repair

author: SEABIRD.HEL
author_rank: Newbie
timestamp: May 05, 2019, 10:18:42 am
content: I'm at the end of my rope with this one and could use some help, much appreciated!Schematics and boardview to be found:https://elektrotanya.com/panasonic_sa-pt470.pdf/download.htmlI got this unit with defect in the SMPS, after diognostics i replaced:The diode bridge, input cap, 2 fuses, and the pwm flyback (mip2f2).The circuit had a short on mainz and after the diodebridge. Both are solved.Now i have 330VDC on the input cap, all good since here in belgium we have 230VAC mainz. And the device workes. Once i boot the device however the voltage goes up to >600VDC which fries the 400V rated inputcap. I checked the diode, resistor & capacitor for preventing EMI and they check out fine.Scope image of problem on startup in attachment.Please help because i'm at the end of my knowledge with this one it seems.I thank anyone in advance for their help, hope i can return the favor some day!
Panasonic TX-58DXX789   Display doesnt Work  - Page 1
Forum section: electronics / repair

author: Michaelaudio
author_rank: Regular Contributor
timestamp: December 20, 2023, 07:18:15 pm
content: Hello people,my father has this TV where the Screen looks like in the Pic down below. Its not a physical damage, so ist must be the Board. Dies anyone hast a clue what this could be?

author: Jwillis
author_rank: Super Contributor
timestamp: December 21, 2023, 06:58:23 am
content: The most common cause of vertical lines is the COF bonding from the control boards on the top of the LCD screen become detached. Usually the lines tend to be continuous. These lines look broken which would lead me to believe its a main board issue.If it's the connections on the LCD, then a little pressure on the FFC/FPC cables (copper coloured ribbons) connected to the top of display will reconnect the breaks and the lines disappear. If that fails try re-seating the flat cables from the main mother board to the LCD control boards. If that fails then the main mother board is probably on it's last breath and needs replacing.

author: Michaelaudio
author_rank: Regular Contributor
timestamp: December 21, 2023, 08:48:48 am
content: All right i will try that, will write an Update.Thanks!

author: Michaelaudio
author_rank: Regular Contributor
timestamp: January 21, 2024, 04:32:14 pm
content: So i've tested every Display related connector/cable now and nothing hast changed. If i disconnect every Signal cable, and only let the Backlight connected, the lines are still there and Look Like in the Pictures attached, its just a black Screen with those lines.So im thinking that it must be the Display itself then?
panasonic vp 5020 Oscilloscope arcing  - Page 1
Forum section: electronics / repair

author: dh109f4
author_rank: Newbie
timestamp: June 09, 2025, 05:42:18 am
content: i got a broken panasonic VP 5020 and plugged it up, it showed a faint trace before disappearing, but the rest of the oscilloscope is finewhen i opened it up the CRT board was slightly misaligned(probably due to shipping, the case is bent too) and i pushed it back in with a screwdriver tip. after plugging it in and checking it with a multimeter pin 1(on the image) was climbing from 0.1v to 0.24v pin 2 was about 10v both pin 3 and pin 4 arced and overloaded my multimeter. and then pin 3 started arcing to the adjacent pin, i think the crt is cooked, can anybody help me solve this. also this is the doc i got my info fromhttps://hirokun.jp/av/vp-5020a.htmlalso i snipped off the capacitor connection since they were cooked (im pretty sure theyre cooked theyre like black at the top)

author: dh109f4
author_rank: Newbie
timestamp: June 09, 2025, 06:04:00 am
content: UPDATE: it does show a trace now and it looks like this, i still dont know how to proceed and i cant find the damn thing's schematic, but the "trace" does response to waveforms and triggers(the digital board seems fine)

author: m k
author_rank: Super Contributor
timestamp: June 22, 2025, 07:19:30 pm
content: Naming goes like Matsushita National Panasonic, not much help though.Maybe groups.io Japanese-Test-Equipment knows better.Maybe it's a Meguro, yes, very helpful.

author: sarahMCML
author_rank: Regular Contributor
timestamp: June 22, 2025, 11:35:21 pm
content: The black marking at the top of those capacitors is perfectly normal.

author: andy3055
author_rank: Super Contributor
timestamp: June 22, 2025, 11:56:43 pm
content: There is a lot of carbonized soot on the board. That can make other HV parts to fail. Make sure it has discharged completely and give it a good clean up. Leave it to dry for a long while-like a day and try it. The arching should be gone. The fuzziness in the trace is due to focus circuit not working properly. Check also the HV multiplier and the associated parts nearby. Check the HT cable going to the tube. You will need to clean any soot on it and the sorrounding area where it connects to the tube. Do these things before you go repacing parts randomly.

author: CaptDon
author_rank: Super Contributor
timestamp: June 23, 2025, 02:12:33 am
content: You do realize that end of the CRT could have something like negative 1800 volts on the pins. Not a smart place to go probing with a multimeter. You have probably killed some of the focus divider resistors by now and maybe your multimeter.
Panasonic VP-7635A/P? Manual Service Guide? - Page 1
Forum section: electronics / repair

author: USMC_Spike
author_rank: Regular Contributor
timestamp: December 25, 2016, 09:11:29 pm
content: Needed for a Panasonic/National/Matsushita VP-7635 a/p/m?Maybe someone has a manual, service guide, schematic, calibration manual it?I have a partially working unit that doesn't seem to function properlyand 1/2 the functions don't work.With some documentation I think I could get it working again.I've not been able to find anything at all for this. What peopledo have them either don't have a manual or won't help or sharewhat they do have.Assistance would be greatly appreciated.Spike

author: USMC_Spike
author_rank: Regular Contributor
timestamp: January 04, 2017, 06:27:41 am
content: Still looking.I hope I'm not

author: USMC_Spike
author_rank: Regular Contributor
timestamp: March 05, 2018, 05:36:48 am
content: Still looking.

author: USMC_Spike
author_rank: Regular Contributor
timestamp: February 03, 2021, 08:45:44 am
content: Hey Spike,Here is another manual number to try:VP-7635A nat-qvp7635aDid you know:Output impedance 75 Ohms. Mates with Leader 3215, Meguro MSG-2570 or any FM generators that accepts external modulation input like the Panasonic/Matsushita VP-8191A, etc.

author: aarons
author_rank: Regular Contributor
timestamp: July 10, 2025, 06:30:51 am
content: For anyone else that stumbles upon this in the future, I had AI translate that french calibration doc. Better than nothing.