hybridfree/eevblog-posts huggingface dataset:
Sony PVM-1442QM monitor no picture - Page 1
Forum section: electronics / repair

author: naujoks
author_rank: Regular Contributor
timestamp: July 07, 2023, 02:49:39 pm
content: I have received a Sony PVM-1442QM which has a fault with the two composite connectors.Yesterday it was running just fine, when after half an hour or so the picture would go dark. Both composite connectors are affected.This morning I tried it again, but no picture. I left the monitor on for a while, turned on the video source (a VHS player), no picture. Then I switched the monitor off and on again after 15 seconds - bam the picture is there again. Watched for half an hour.Turned everything off for a few hours, then on again, and no picture. Leaving the monitor on for a good while and then switching it on and off brought the picture back.I was wiggling the connector around a bit, but it doesn't make a difference, I would exclude a cold solder joint as a cause.I was having problems with the SVIDEO connection as well, but here wiggling the plug around and pushing it in really deep made a difference. I checked the board for cold solder joints, but there were none, so I suspect there is a problem with the socket.In either case, the SVIDEO problem seems unrelated the the composite connectors.Any ideas what I could try? Capacitors maybe? Which ones though, there's literally a hundred on those boards.

author: MathWizard
author_rank: Super Contributor
timestamp: July 09, 2023, 03:24:37 pm
content: Do you have an oscilloscope ? Maybe some rail voltages are close to unacceptable levels, and something shuts down kind of at random ? When it loses picture, is it just the backlight going out ? Anyway to see if the video data is still being sent out ??

author: naujoks
author_rank: Regular Contributor
timestamp: July 10, 2023, 08:34:31 am
content: I do have a scope.It would be odd if there's a problem with the power rails that only the two composite channels are affected?It's a CRT, so there's no backlight.The PCB is crazy complicated, I don't have the schematics, don't know if they exist. I'd need those to trace the video signal.

author: decoder_82
author_rank: Regular Contributor
timestamp: July 10, 2023, 12:36:16 pm
content: You can find the schematics in the service manual:https://archive.org/details/sony_PVM-1440QM_1442QM_1444QM_Service_ManualI believe signal tracing is the best option. If you have a signal generator you can inject color bars and try to follow it.

author: belzrebuth
author_rank: Frequent Contributor
timestamp: January 13, 2024, 09:13:25 pm
content: Did you ever fix this issue?Happened to me as well with a PVM-1444QM.RGB input is fine it's only the component input (not composite!) that gives trouble.Funny thing is that it goes away when I power cycle the unit, and it's not the connectors because RGB utilises the same connectors.After a minute or so it gradually goes dark..
Sony PVM-1442QM problem - Page 1
Forum section: electronics / repair

author: naujoks
author_rank: Regular Contributor
timestamp: August 15, 2023, 06:37:06 pm
content: I have a beautiful Sony PVM-1442QM, which has developed a problem out of the blue.When switching it on, there was a hissing sound and the power LED went from bright green to dim green after 2 seconds. No picture.Opening up I could see no blown parts.I swapped the power supply board from another monitor, same model, and it actually came on again.I didn't use it for a couple of weeks and when I switched it on again today, the same symptoms as before were showing. The power supply board is good, I checked the voltages and tried it in the other monitor.I switched on the monitor, leaving it uncovered to try and see/hear where the hissing sound is coming from, and I could see some arching and the smell of ozone (lovely!) coming from Q501 on the main board, which I think is the HOT.I took it out, measured it through, but it seemed fine. I replaced it with a new one (2SD1397), but it didn't fix it.Any ideas what could be responsible for those symptoms and what else I could check?

author: inse
author_rank: Super Contributor
timestamp: August 17, 2023, 09:41:43 pm
content: Mmaybe the FBT is cracked and there is a HV discharge.Might be intermittent in the beginning.Run the set in a darkened room and look for arcing.
Sony PVM-14M2E Power Supply - Page 1
Forum section: electronics / repair

author: decoder_82
author_rank: Regular Contributor
timestamp: August 10, 2021, 12:48:27 pm
content: Hello !I am trying to repair a Sony PVM-14M2E that has an issue with the power supply. When powered on, nothing happens.See the diagram of the PSU in attachment.What has been checked/done:- Fuse was blown, the fuse has been replaced,- STRS 3115 had pin 1 and 2 shorted. It seems a common issue on those PVMs (seehttps://www.arcade-projects.com/threads/str-s3115-datasheet-wtb.15830/). The faulty IC has been removed and replaced with a good one.- All electrolytics capacitors, resistor and diodes have been tested and are OK.- Power switch is working fine, when turned on I get 230v at the main rectifier input. When I check the output voltage of main rectifier D601 (D4SB60L), I get 330v DC. Is that normal?Even after replacement of the components, I get nothing from the PSU, the capacitors are not even taking any load.Does someone has some suggestion on what to check next to further trouble shoot?

author: decoder_82
author_rank: Regular Contributor
timestamp: August 11, 2021, 05:11:25 am
content: Adding in blue some measurements done.

author: ambrosia heart
author_rank: Regular Contributor
timestamp: August 12, 2021, 02:14:54 pm
content: Repair steps see pm.
Sony PVM 20M4E Only Displays Picture / Menu when Underscan Button is Pressed - Page 1
Forum section: electronics / repair

author: pvmhelp
author_rank: Newbie
timestamp: November 11, 2023, 08:26:17 pm
content: I have a Sony PVM 20M4E that only displays the picture / menu when in underscan mode. If I take it out of U/S mode, I just get a blank screen (Menu doesn't work) brightness / contrast controls don't work.I'm hoping that that is enough of a clue to help me narrow down the issue. (Definitely rules out the PSU, Neckboard and Input Board at the very least).I've been testing capacitors and found two which were out of spec in the defection area (as far as I can tell). They were both adjacent to heatsinks. I replaced them thinking that that would solve the issue.I put it all back together and it has made no difference at all.So I guess I'm back to testing the remaining caps and reflowing every joint).It's a lovely burn free, sharp tube. I'd love to get this going again.Any pointers would be greatly appreciated!Service manual:https://archive.org/details/SonyPVM20M220M4ServiceManual

author: m k
author_rank: Super Contributor
timestamp: November 14, 2023, 09:31:48 am
content: The machine is not generating any pictures.OSD menu is piggypacking what is coming it.So underscan picture goes thru, but normal size is cut out somewhere.Start following U/S signal, it's either on or off.Maybe it is partially faulty and not selecting everything it should.
Sony PVM-9044 composite audio not working - Page 1
Forum section: electronics / repair

author: belzrebuth
author_rank: Frequent Contributor
timestamp: May 19, 2023, 12:33:09 pm
content: Hi,I've got a weird issue with a Sony PVM 9044 that outputs no audio from either Line A or Line B composite inputs.RGB audio input works fine..IC402 audio switch is used for both RGB and Composite audio inputs.I think that is unlikely for 2/3 of this chip to fail, so kind of stuck on what might be the fault here.Any ideas would be welcome!I attached part of the audio schematic, the full schematic is located here:https://ia600604.us.archive.org/28/items/sony_PVM-9041QM_9044QM_Service_Manual/PVM-9041QM_9044QM_Service_Manual.pdf

author: wasedadoc
author_rank: Super Contributor
timestamp: May 19, 2023, 05:01:20 pm
content: The A and B inputs first go to a changeover switch in the IC. Then a second changeover switch selects that output or RGB audio input. That second switch is controlled by the voltage on pin 4. Is that voltage changing?It only needs half the chip to fail, not two thirds.

author: belzrebuth
author_rank: Frequent Contributor
timestamp: May 19, 2023, 05:40:04 pm
content: Yeah half you are right.! I saw the audio reaching the inputs but I didn't check the switch signal. Will report back..
Sony PVM developed issue with VHOLD latch - Page 1
Forum section: electronics / repair

author: mikeyp
author_rank: Newbie
timestamp: July 02, 2023, 05:44:21 pm
content: Hi, I have 2 9" SONY PVMs. When last used in 2020, they were both working fine. Yesterday, one worked fine, the other is latching its vhold in the wrong place. This is irrespective of console or input type. Adjusting the VHOLD knob will cause it to roll but will still ultimately latch in the same place. See photos for comparison. They are close in type but not entirely identical. The bagged one is in somewhat better physical shape too but this didn't seem to matter 3 years ago.For reference, the good one in the bag is a SONY PVM-9045QM and the failed one is a PVM-9041QM.Re. my skills, I'm not averse to measuring or soldering anything, dealing with sensitive electronics or high voltages so please don't worry about that. I'm just not familiar with these units and don't know what I'm looking for. Any help fixing it is greatly appreciated.Rear/FrontRGB ComparisonS-Video ComparisonComposite Comparison(I need to post and see if I can fix the pictures as I'm not great at this)

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: July 02, 2023, 11:14:30 pm
content: Although I have not seen these models, similar units have had bad capacitors cause these problemsalso check for cold solder joints.Jeff

author: mikeyp
author_rank: Newbie
timestamp: July 03, 2023, 07:25:23 pm
content: Thank you. I was hoping to avoid generic "check all the capacitors" replies as this thing has ~150 of them and most of the unit is working fine. I don't think it's a cold solder joint issue as it's not something that's coming/going with vibration. I did try thumping it when you mentioned it but no change. It seems that the H/V Delay circuit is stuck for V delay at least. I'm hoping to investigate around here for something. There is some corrosion in this area too but hard to investigate.I have found the service manual here:https://archive.org/details/sony_PVM-9041QM_9044QM_Service_Manual
Sony-reader DPT-RP1: Ghosting - Page 1
Forum section: electronics / repair

author: MarkFalk
author_rank: Contributor
timestamp: November 06, 2024, 04:27:38 pm
content: Hello,I am owning and using a Sony DPT-RP1 13,3"-reader for several year, daily usage. Since some months the display shows the effect of "ghosting" - when opening / going to a new page the previous pages are still visible as "background-shadow", like a "ghost"picture of the previous pages, In darker and lighter colour. When changing a page the display is not erased to a "white" background and the background is no longer "white" (as it was in the past) but something as grey. When zooming into the page the "ghosting"-effect is less, but after "Exit" the zoom "ghosting" comes back.Does anybody has an idea, what is the reason for this and how I can "repair" the device? I have already disassembled the device and remove/reinserted the connectors of the display, but w/o success. The battery-voltage is o.k. (charged around 4,1V).
Sony RX1R II Service Manual anyone? - Page 1
Forum section: electronics / repair

author: 0xPIT
author_rank: Regular Contributor
timestamp: February 16, 2023, 02:19:23 pm
content: Hi,I'm desperately looking for the fullService Manual(Level 3 - Schematics + PCB) for aSony RX1R II Camera.I have the RX1R from Electrotanya, and there was a(n incorrectly rendered) Version of the RX1R II at servicemanuals.us. (Site is down since this week)However, I'd need a PDF version (i.e. vector images) that alsocontains the PCB placementsof components.My problem is that I can't get the LCD to work, despite the View Finder and HDMI work and they share signals.Thanks,pit

author: naw
author_rank: Newbie
timestamp: December 08, 2023, 10:18:26 pm
content: Hey were you able to find the manual for the Sony dscrx1rm2Thanks

author: 0xPIT
author_rank: Regular Contributor
timestamp: December 08, 2023, 10:44:08 pm
content: Unfortunately not...
Sony Security Camera power board repair - Page 1
Forum section: electronics / repair

author: Ariannus
author_rank: Newbie
timestamp: September 02, 2014, 10:52:45 pm
content: I'm looking for advice for how to proceed repairing this power board for a Sony SNC-CS10/CS11 camera. I previously repaired one of these that just had a blow fuse, and when this ones fuse was blown I figured it would also be a simple repair. I put in the new fuse, but it blew immediately so I took it apart and started poking around.When I probed the common mode choke with my multimeter I found that there was a dead short between the two sides of the AC input. I think that the short has to be in the choke itself, D853, D854 or one of the components under the choke D851, D852, or C851 - C854 as those are the only components that are before the "C9 7N" diodes and I don't read the short past them. I'm not sure how to isolate the short any further except by starting to remove components.If I'm totally wrong in my diagnosis or if you can give men any advice on how to proceed it would be be appreciated.For reference the AC 24v input is on pins 1 and 2 of CN802, pins 3, 4, 7 and 8 are chassis ground. That's as far as I've worked out so far. I've also included a picture of a second camera opened, but with everything still wired up, just for reference.

author: Legit-Design
author_rank: Frequent Contributor
timestamp: September 02, 2014, 11:26:58 pm
content: Flux in itself might not be conductive, but once you start to get all kinds of things mixed with flux it might become conductive. Things like moisture from the air and all kinds of things.

author: Ariannus
author_rank: Newbie
timestamp: September 03, 2014, 02:39:22 am
content: I didn't think it would help, but I cleaned off the flux residue anyway. It didn't make a difference. I know the CS10 was a budget camera by Sony's standards but I was pretty disappointed when I saw all that flux residue on the board when I first opened it.

author: Rasz
author_rank: Super Contributor
timestamp: September 04, 2014, 01:47:57 am
content: short is the easiest type of defect to diagnosejust start pulling components until there is no short

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 04, 2014, 10:46:45 am
content: If you are reading across the choke, it's normal to have a low ohm reading on the meter.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 04, 2014, 10:55:22 am
content: Quote from: 4thDoctorWhoFan on September 04, 2014, 10:46:45 am

author: kjn4685
author_rank: Regular Contributor
timestamp: September 06, 2014, 08:42:29 pm
content: I would definitely clean the board off. You have a lot of crusty parts and connections.

author: bradcit
author_rank: Newbie
timestamp: July 31, 2020, 06:03:13 am
content: We know that security camera save the hidden record and we can store all data in hard drive, But recently I faced the security camera power board problem. Then I uninstall the software from my device. But when I tried to reinstall at that timecctv installationfailed message shown on my system. I was so frustrated with that problem. Need suggestion.
Sony soundbase HT-XT2 - Page 1
Forum section: electronics / repair

author: keland_uk
author_rank: Contributor
timestamp: May 18, 2020, 03:26:27 pm
content: Really inspired by Dave and his videos and you guys helping....Setting up an electronics lab, different story, but have reworking capability...My sound base (SONY HT-XT2) has become unresponsive. This appears to be a common problem for these, I can find a service manual for the HT-XT1 and the HT-XT3, but no HT-XT21) Anyone know where I can get a service manual from?2) To be honest it kind of works but is dead slow, as if the clock speed has gone, or the software is busy. Nothing obviously blownI've tried to update the firmware, but like most things it is a) up to date and b) won't let me upgrade to same version.
Sony SRF-HM55 FM/AM Walkman Repair - Page 1
Forum section: electronics / repair

author: spongella
author_rank: Contributor
timestamp: April 04, 2020, 11:12:10 am
content: My Sony FM/AM Walkman headphone radio was sporadically shutting off over the past few months. I would install new batteries but they would last only a few days. I checked the batteries using a battery checker and most times they tested good. I was using Kodak batteries and figured that might be the problem. After months of having this problem I finally decided to open up the Walkman. The problem was faulty battery contacts.If you open up the side where the batteries are installed you'll see that the batteries connect to the main board by touching the + and - solder points on the main board. A poor design in my opinion. Over the years the solder points had holes worn into them by the battery contact pins. Problem was solved by just flowing new solder onto the main board solder points and building them up a bit.These headphones are used daily in- and outside and are excellent on AM. Bought them used from a Good Will store a few years ago. Was on the verge of tossing them out and buying new, but it turned out to be a simple fix.I've also seen the same poor battery contact problems with two of my wife's Dakota watches.
Sony srs-xb30 Bluetooth speaker - Page 1
Forum section: electronics / repair

author: moochinazz
author_rank: Newbie
timestamp: February 06, 2020, 05:13:42 pm
content: Hi, i have bought sony srsxb30 Bluetooth speaker (used). Iy wont turn on, i have checked the battery and it's good. Im suspecting the controller on power supply board, but google won't identify the part, could you please help me identify the part in question?
Sony SRS-XB40 charge circuit repair notes - Page 1
Forum section: electronics / repair

author: fixy88
author_rank: Contributor
timestamp: October 31, 2020, 08:49:07 am
content: Symptom: After incorrect charger used, orange charge LED remains on when charger unplugged and unit powered off, battery discharges when unit powered off.Repair: Replace U8 charge control IC with BQ24133 and shorted mosfet Q2 on underside with SI2306.
Sony STR-DB870QS standby transformer - Page 1
Forum section: electronics / repair

author: denisten
author_rank: Newbie
timestamp: April 16, 2023, 07:28:55 am
content: Hi everyone, i am a newbie here and i hope i will find the help i need. I have the above mentioned receiver with standby transformer's primary coil damaged. I have searched the net without success to find any tech data about this transformer. I have only the Sony part number1-437-313-11 and TAM Malaysia M0126. I guess i could find replacement for it, but i need to know the secondary coil voltages and VA. It is 220v on the primary. It has 5 pins on the secondary, the outer two are not used and i have 6.5 ohms between pins 2and 4, 3,9 ohms between 2 and 3, and 3,6 ohms between 3 and 4. Can someone determine looking the schematics what voltage i need on the secondary? This transformer is mounted on a small board called AC board and the only voltage going out of it is 8v to the main cpu. Other 4 pins on the connector CN51 are ground and 3 incoming voltages, i think. There are two transistors right after the transformer and i am wondering if it is 15-0-15 or maybe something else. Any thoughts about it will be highly appreciated.

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 02, 2023, 09:04:32 pm
content: Hi!There is a supplier that list your transformer as an orderable spare part here:–https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.searspartsdirect.com/product/64koykq1kb-0003-474/id-1-437-313-11&ved=2ahUKEwjln5uJxdf-AhVKZMAKHb7cCuEQFnoECBUQAQ&usg=AOvVaw2W06ajnvAo4Rpxg59FoeunAlternatively, if that's too expensive and you want to try replacing it yourself, it's 6–0–6 V at about 500 mA!You should be able to find something in the encapsulated "block" type of transformer about 4 to 6VA rating that should fit the PCB, altho' you might have to drill additional holes in suitable places in the PCB to fit a new one!Chris Williams
Sony str dg500 dim display - Page 1
Forum section: electronics / repair

author: Connecteur
author_rank: Frequent Contributor
timestamp: May 17, 2021, 09:17:51 pm
content: I have what appears to be a VFD (vacuum fluorescent display).It's turned up to full brightness and it's barely readable, even in low light.It seems to be on it's way out. Is there a simple and uncostly repair available?

author: AtomicRob
author_rank: Contributor
timestamp: May 18, 2021, 05:36:35 pm
content: I have some gear with a similar issue and I saw an interesting thread here:https://www.eevblog.com/forum/chat/vacuum-fluorescent-display-rejuvenation/with some suggestions.

author: mzacharias
author_rank: Frequent Contributor
timestamp: May 19, 2021, 02:01:09 pm
content: The display tube may be bad, but before condemning it I would check the filament voltages, any small parts like resistors or diodes associated with the filaments,and also check the -30V bias supply.
Sony TA-V5 amplifier diagram / service manual - Page 1
Forum section: electronics / repair

author: xavlaur
author_rank: Contributor
timestamp: April 20, 2021, 04:13:23 pm
content: Hello !If anyone has the diagram from the Sony TA-V5 amplifier. I found the Sony TA-V7 but it differs a lot.Thank you

author: joe-cool
author_rank: Newbie
timestamp: February 13, 2024, 08:58:26 am
content: Don't know if still relevant, but on my search for it I found your post and.... the manual:https://archive.org/details/manual_TAV5_SM_SONY_EN/mode/2up
SONY TV ERROR REGISTER KDL32CX527 - Page 1
Forum section: electronics / repair

author: quinoara
author_rank: Contributor
timestamp: January 30, 2020, 09:00:23 pm
content: Dear friends of the Forum, you have an idea how to remove this error record 002 from a mainboard sony KDL32CX527. What was brikeo? ... I explain ... this TV was supposedly bought two boards in good condition but when mounted they give the same error as the original mainboard ...... the mainboards were mounted on another TV just like it is operating well, in good condition and presented the same errors, the mainboard of the TV that is good was extracted and the TV was put with failure and I present the same error ..... the mainboard was put back on the good TV and now it has the same error as the others ... that is, it is saving the error in the rom or the EEprom but it does not remove it, as it does not immediately turn on the stanby led is not lit but it gives two flashes indicating source error , there is no way to enter the service mode, or the service attached in the image, you can not update the Firmware under these conditions, I appreciate any ideas. regards
Sony TV KD55X8500G power on issue - schematics? ideas? - Page 1
Forum section: electronics / repair

author: DTJ
author_rank: Super Contributor
timestamp: January 07, 2023, 06:04:01 am
content: My 3 year old Sony TV shutdown unexpectedly the other night and now will not power on. The factory reset doesn't work either. It appears completely dead.I found a service manual for an earlier variant online athttps://servlib.com/sony/tv/kd-55x8500a.html?start=0Being completely dead had me hoping it was just a fuse or similar but I cannot see anything obvious.Before I started poking around further I wondered is there such thing as schematics available for these things?If so where will I find them?Thanks

author: fzabkar
author_rank: Super Contributor
timestamp: January 07, 2023, 06:22:15 am
content: https://elektrotanya.com/showresult?what=KD55X8500G&kategoria=All&kat2=All

author: DTJ
author_rank: Super Contributor
timestamp: January 07, 2023, 06:40:28 am
content: Excellent. Thanks Frank. No detail schematics but much more information than I had.Cheers.

author: DTJ
author_rank: Super Contributor
timestamp: January 08, 2023, 11:11:11 am
content: Follow up for posterity.The 3V3 stay alive rail was not present.It had a DDA010 switching supply chip driving a transformer followed by a schottky rectifier.The SB260 schotty had failed S/C. I replaced it and it now works ok.

author: bow
author_rank: Newbie
timestamp: November 14, 2024, 08:48:41 am
content: Thanks! I found the same issue with my Sony XBR-75X900F. The TV suddenly wouldn’t power up. After replacing the Schottky diode SB260, it’s now working again. I was worried the eMMC might have been damaged from wear after 6ish years.I also have an SB560 on hand, so if the issue happens again, I’ll try replacing it with that.
Sony 40" LCD TV: static blue stripes - Page 1
Forum section: electronics / repair

author: analogix
author_rank: Frequent Contributor
timestamp: July 27, 2019, 08:54:15 pm
content: One day when I switched on our TV (Sony KDL-40W3000) we had a series of blue stripes along the bottom of the screen which won't go away.Does anyone have an idea what the cause of this could be and if it's an easy repair or not? If it's an easy fix I have no problem replacing broken components, but I don't have the knowledge (or gear) for any deep troubleshooting.

author: analogix
author_rank: Frequent Contributor
timestamp: August 20, 2019, 09:12:33 pm
content: Anyone?Is it worth repairing, and doable for a non-engineer?

author: Rasz
author_rank: Super Contributor
timestamp: August 21, 2019, 09:02:15 am
content: 12 year old, bad panel (glass)

author: analogix
author_rank: Frequent Contributor
timestamp: August 21, 2019, 09:13:58 am
content: So this is a common symptom of the LCD starting to die, or just a wild guess?I suppose if it's the former, the solution is to replace the entire LCD panel?

author: Rasz
author_rank: Super Contributor
timestamp: August 21, 2019, 02:20:30 pm
content: you can try percussive maintenance around glass/flex cable interfacebut due to age reasonable solution is to replace whole tv
Sony VCR Repair (SLV-ED10) - Page 1
Forum section: electronics / repair

author: paddyfield77
author_rank: Newbie
timestamp: October 21, 2022, 03:49:53 pm
content: I got this VCR from a friend of mine as it stopped working and he wasn't interested in fixing it, makes sense as it isn't worth much nowadays. However, I got a few tapes around the house and I would like to watch them with my kids. I know some basic stuff about repairing electronics.So it doesn't power up at all. I opened it up and checked the cable and one of the wire was open! I thought I was really lucky and I replaced the cord. I plugged in the power supply (it wasn't attached to the machine) and measured the output voltage and it read way high! +6V line was at +8V, +35V line was around +45V and the +13V and -13V lines were around +18V and -18V.I am fairly confident that something is wrong with the power supply board and luckily I didn't plug it into the machine. I have also attached the schematic diagram of the power supply board.So can someone in this forum point me in the right direction to fix this issue? Thanks

author: inse
author_rank: Super Contributor
timestamp: October 21, 2022, 04:58:22 pm
content: First question is: what is the VCR doing now?Basically, only the 6V rail is regulated, the other voltages are defined by the turns ratio of the transformer.Did you measure the voltage levels around IC201?You can adjust the voltage with RV201.

author: paddyfield77
author_rank: Newbie
timestamp: October 22, 2022, 02:25:25 am
content: Initially it was not powering on. No signs of life at all. I opened the cover and found out that the power cord was broken so I replaced it with a good one I had. So before connecting the power supply board back to the unit's main board, I decided to check if it is working and I found out that the voltages were way above what they should be as I have said in my original post. So I did not plug it into the unit as it looked like there is something wrong with the power supply and it might fry something in the main board.Yes. I did measure the voltages around IC201. There was 3.7V on the pin which is connected to the optocoupler, 2.5V on the second pin and the third pin is ground.I did try adjusting RV201 but it did not affect the voltage much. There was only a slight change in the millivolts range when I adjusted it.

author: fzabkar
author_rank: Super Contributor
timestamp: October 22, 2022, 03:29:02 am
content: Check the electrolytic B+ capacitors.

author: inse
author_rank: Super Contributor
timestamp: October 22, 2022, 04:46:54 am
content: Or the regulation is not working properly without a load…

author: paddyfield77
author_rank: Newbie
timestamp: October 22, 2022, 05:13:30 pm
content: Is it possible to check capacitors without an ESR or capacitance meter?

author: paddyfield77
author_rank: Newbie
timestamp: October 22, 2022, 05:15:54 pm
content: Replying to @inse - You might right about that but I am worried if I might fry up something on the main board if I plug it in as some voltages are really really higher than what they should be.
Sony VPL-FHZ65  professional project ( laser model) - Page 1
Forum section: electronics / repair

author: charlyd
author_rank: Frequent Contributor
timestamp: November 29, 2019, 03:59:33 pm
content: Hi i have a Sony VPL-FHZ65 projector and i am looking for some info regarding to my problem. i am curious if i can also ask some repair question here for sony projectors.One of my question with is: after powering on the green led starts blinking for some 15 seconds (warmup) after that i hear a click inside the power supply and see on the same location of the green led now a red led flashing twice shortly. with a pause.. and the power goes in protect after the click.like----red--red-------------------------red--red-------------------------red--red-------------------------red--red-------------------------red--red-------------------------red--red----
SONY VPL-VW760ES  - Page 1
Forum section: electronics / repair

author: gwelect
author_rank: Newbie
timestamp: July 08, 2025, 06:12:32 am
content: Hi, there is no clue on the web for error codes for this projector.. It turns on and after few seconds turns off with 4 red blinks at the error LED. any idea?

author: AndyC_772
author_rank: Super Contributor
timestamp: July 08, 2025, 06:42:17 am
content: I'd check on a site like AVForums, these projectors are quite popular but you'll need to find someone into home cinema rather than electronics as such.Maybe start by checking the obvious things, the bulb and then the cooling fan?

author: aronake
author_rank: Frequent Contributor
timestamp: July 14, 2025, 05:29:22 pm
content: If on/standby is red and warning blink 4 times, it is supposed to be a "Firmware update error"
Sony Walkman TPS-L2 Battery Cover & SPring Help - Page 1
Forum section: electronics / repair

author: Queezoman
author_rank: Newbie
timestamp: June 23, 2024, 06:52:24 pm
content: Just replaced the belts on my vintage Sony Walkman TPS-L2 but don't recall how to reassemble the battery cover. There's a hinged metal bar at the bottom of the cover. Where does it go? How does the cover stay in place? I also can't get the bottom screw to align with the hole in the black piece inside battery compartment. Lastly, the tape door doesn't stay closed flush. Is it possible I stretched the spring and that's the cause because it's too long now? How to make the spring more compact so the door closes flush? Would rather not cut it. Videos and pics would help. Thanks!

author: m k
author_rank: Super Contributor
timestamp: June 30, 2024, 03:38:13 pm
content: https://www.eevblog.com/forum/blog/eevblog-752-original-sony-walkman-tps-l2-teardown/
Sony wf-1000xm4 ic identification  - Page 1
Forum section: electronics / repair

author: Tarien
author_rank: Contributor
timestamp: October 02, 2022, 06:57:56 pm
content: Hi everyone,im repairing sony wf-1000xm4 case, i got problem with chip identification with i assume is some kind of hall sensor.If anybody have idea i will be thankfull
[Solved] Sony XBR IC ID - Page 1
Forum section: electronics / repair

author: jeffjmr
author_rank: Regular Contributor
timestamp: May 02, 2022, 03:19:02 pm
content: Trying to repair a common problem; Sony XBR XXX930D no power.Sony replaced the power board once. Problem reappeared a few months later. All indications are this IC is the culprit, and this replacement board shows signs of this IC having been replaced along with the installation of a 72K resistor between pin 8 and the cap to the right. I have removed the resistor to ID the chip.But no combination of the codes on the chip are returning a hit. Pretty sure it is a LDO DC buck converter but no schematic or parts list in the service manual. Troubleshooting just says replace the board.Any ideas?Thanks,Jeff

author: fzabkar
author_rank: Super Contributor
timestamp: May 02, 2022, 05:27:41 pm
content: I couldn't find anything in TI's part marking database:https://www.ti.com/packaging/docs/partlookup.tsp

author: jeffjmr
author_rank: Regular Contributor
timestamp: May 02, 2022, 05:56:50 pm
content: Yeah, neither could I, but several other units have a TI TPS54334, which I now believe is the same or equivalent part. Have one on order.Thanks.Jeff
Sony Xperia XZ2 Compact Schematic? - Page 1
Forum section: electronics / repair

author: sirtet
author_rank: Contributor
timestamp: August 17, 2020, 09:50:39 am
content: So, after a water damage my Phone's Touchscreen registers ghost-touches...Opening it, i see a blown cap. (i guess) next to the screen connector.I could not google a service manual to figure it's value, does anyone here have access to one, or has an idea where to get access to?

author: Mario87
author_rank: Frequent Contributor
timestamp: August 18, 2020, 04:45:57 pm
content: Looks like its just for decoupling to me. Check if one side connects to ground, if it does then it's only there to clean up the DC signal. However if it has failed it may be shorted to ground and hence you are getting problems.Simply removing the cap and cleaning the area to ensure there is no short may be all that is required.
Sonytek Curve tracer 370A Self test ram failure - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: October 11, 2025, 06:24:38 am
content: hello AllSony tek 370A self test failure - Ram errorPFA attached error code and CPU board and the Ni cad batterybattery is showing 0.8 Voltshave just downloaded the manualLV and HV supplies appears to be okHas anyone worked on this model previously. need to make extenders to probe the CPU BoardThanks in advanceAnand

author: squadchannel
author_rank: Frequent Contributor
timestamp: October 11, 2025, 07:19:50 am
content: if it's a RAM error, it's reasonable that the SRAM would fail when the battery runs out, uses the battery to retain the data.(it's called NVRAM.)Where is the calibration stored? If it's in NVRAM, that's a big problem!

author: picburner
author_rank: Frequent Contributor
timestamp: October 11, 2025, 08:41:05 am
content: You probably just need to replace the battery only.The U800 and U810 memory doesn't contain calibration data, but the CPU workspace and user configurations only.But the CPU needs to read this data to boot the system and function properly and a drained battery is likely preventing it from doing so.My Tek 370 (without letters) doesn't have a battery but uses bubble memory for user data; the CPU workspace is in DRAM.Calibration for these machines is done the old-fashioned way by turning trimmers.

author: squadchannel
author_rank: Frequent Contributor
timestamp: October 11, 2025, 09:34:32 am
content: Quote from: picburner on October 11, 2025, 08:41:05 amThat's good news.it means we won't have to deal with a bomb like DALLAS NVRAM.

author: Greybeard
author_rank: Frequent Contributor
timestamp: October 13, 2025, 10:03:08 am
content: Quote from: picburner on October 11, 2025, 08:41:05 amDo you know a modern replacement for the bubble memory cartridge?

author: picburner
author_rank: Frequent Contributor
timestamp: October 13, 2025, 03:21:48 pm
content: Some time ago I had the idea of ​​creating a modern replacement for bubble memory cartridges.All I had to do was analyze the data transfer with a logic analyzer and understand the protocol.Then, because it was a very time-consuming task, I gave up.I hope bubble memory lasts as long as possible.I don't think there's a ready-made solution on the market.

author: Greybeard
author_rank: Frequent Contributor
timestamp: October 14, 2025, 06:47:37 pm
content: Maybe someone has an idea how to adapt FRAM?

author: edavid
author_rank: Super Contributor
timestamp: October 14, 2025, 07:08:52 pm
content: I don't understand how a battery failure would cause a self test error, unless the battery is shorting the RAM VCC. I would try desoldering the battery and see if the error goes away.

author: hitecelec
author_rank: Regular Contributor
timestamp: October 15, 2025, 05:00:06 am
content: Hello AllReplaced the battery with an equivalent though not the right fit.The self test error disappeared after replacing both the RAMS. Unit now passes self tests.seems to be ok. Yet to do a functional checkThanks for all the assistanceRegardsAnand
Sony/Tektronix 326 scope trace disappears on some time/div settings - Page 1
Forum section: electronics / repair

author: Tim88
author_rank: Regular Contributor
timestamp: January 30, 2022, 04:30:59 pm
content: I bought this neat little scope 7 years ago and shelved it. It was missing the detachable power pack/charger and miraculously, one popped up on the ebay for $9.99! Anyway, it works, kinda. On certain time/div settings, the trace either disappears or kinda fades in and out with the intensity. The kinda trace fades settings are 10ms, 1ms, .1ms 10μs, 2μs, 1μs and the trace disappear settings are 5ms, .5ms, 50μs, 5μs, 1μs. I discovered, quite on accident, that if you turn the cal knob out of its calibrated position (about half way), the trace comes in on the CRT. In the manual, there is a nice schematic of the timing board and the problem settings match up with switch positions exactly.So, tested the switch, tested fine. Used an ohmmeter from point AH to points AA and Z (where I figgered the problem was) and it tests perfect, 0 ohms. Checked the timing resistors and the cal pots R622 and they are perfect. The -5 volt CC to the pot is dead on.I am usually pretty good at figgering out problems but this has got me at a dead end. Thought sure it was that daggum switch, then that daggum pot. I need some fresh eyes, what am I overlooking?

author: Tim88
author_rank: Regular Contributor
timestamp: January 30, 2022, 05:30:40 pm
content: A couple more sch of the horizontal section.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 01, 2022, 02:15:16 pm
content: Age? check capacitors would be my first thought, not that I am familiar with that scope.Jeff

author: med6753
author_rank: Super Contributor
timestamp: February 02, 2022, 04:57:15 am
content: I'm not familiar with that scope and while looking at pictures it appears that it does not have an "Auto" mode for the triggering. Is that true? If yes, there may not be an issue. If you apply a signal to channel 1 and select triggering to channel 1 and then rotate the triggering control does the trace appear and lock in the time setting where it was previously missing? If it does I would say that's normal function for that scope.
Soonree Plasma Cutter LGK-40 wont make any Cutting Arc - Page 1
Forum section: electronics / repair

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 30, 2023, 05:59:12 am
content: this is only one time use of this china hung low plasma cutter. the first time its working then i put in storage. now i want to make a cutting, but it wont cut anymore. the unit turn on. relay to pass the compressed air is working, everything working except when i want to cut, nothing happened... i checked ground and nozzle cables all in good shape and continuity.. any hint which component is broken? and way to fix this? damned the hunglow design and parts..

author: Psi
author_rank: Super Contributor
timestamp: April 30, 2023, 06:26:10 am
content: Can you make it start by touching a small piece of wire between the tip and the grounded work piece to create the initial arc?If so it isolates the problem to a fault with the HF starting arc

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 30, 2023, 08:08:32 am
content: Quote from: Psi on April 30, 2023, 06:26:10 amdo you mean try to form arc between workpiece and A? (stock photo attached) my nozzle assembly start with nozzle handle, and then we put A into it, and then ceramic sleeve B and then C and then ceramic cover D... C is the one connected (touching) workpiece but not electrically connected to A due to B isolation... A is electrically connected down to nozzle handle to the cutter unit/body. if anything (by right), if we touch C to work piece, arc should be formed between C and A (there is very thin gap between them inside).. trying to play around with wire to arc with A is a bit tricky as A is enclosed in C with only a tiny hole at C. i have to dissasemble D, C and B, find a way to hold A to the nozzle handle and try to play arc with wire workpiece...

author: Psi
author_rank: Super Contributor
timestamp: April 30, 2023, 08:46:34 am
content: Not too sure, I only have a TIG not a plasma cutter, but I assume it also produces a high voltage pulse to start the arc.

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 30, 2023, 10:01:05 am
content: if i'm going to probe nozzle tip with DSO for diagnosis at open circuit, what voltage should i expect? kVac?

author: CapLeaker
author_rank: Regular Contributor
timestamp: April 30, 2023, 04:32:22 pm
content: I dealt with that on an LGK-60 over at badcaps.https://www.badcaps.net/forum/showthread.php?t=68275&highlight=plasma+cutter

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 30, 2023, 05:27:03 pm
content: Quote from: CapLeaker on April 30, 2023, 04:32:22 pmthanks, but i cannot register, so i cannot see pictures. the only hints i can get are broken resistors and adjusting spark gap.. if you can post pictures here that will be good.

author: CapLeaker
author_rank: Regular Contributor
timestamp: April 30, 2023, 07:04:49 pm
content: Let’s see if this works…

author: CapLeaker
author_rank: Regular Contributor
timestamp: April 30, 2023, 07:08:07 pm
content: Another pic…

author: CapLeaker
author_rank: Regular Contributor
timestamp: April 30, 2023, 07:27:25 pm
content: More pics again
sop8 unknow - Page 1
Forum section: electronics / repair

author: gbr600
author_rank: Newbie
timestamp: September 12, 2020, 02:32:30 pm
content: Goodmorning everyone i came across the repair of an elevator inverter but i can't find the technical data sheet of this smd sop8 component marked sgc does anyone kindly know it?

author: TheMG
author_rank: Frequent Contributor
timestamp: September 12, 2020, 03:25:41 pm
content: Some context would definitely help. What is the manufacturer of the inverter? What part of the circuit is this IC from? Any idea as to its function?I don't even recognize the logo on that IC. Without more information it will be pretty hard to find anything.

author: gbr600
author_rank: Newbie
timestamp: September 12, 2020, 05:49:08 pm
content: the inverter is otis ovfr3is the integrated is placed at the serial input that goes to the panel board

author: gamalot
author_rank: Super Contributor
timestamp: September 12, 2020, 07:06:27 pm
content: Its a PLCDA12 TVS array from Protek Deviceshttp://www.protekdevices.com/xyz/documents/datasheets/plcda.pdf

author: gbr600
author_rank: Newbie
timestamp: September 12, 2020, 08:30:11 pm
content: Great!!Thanks you so much for the help!!!!
Sorensen / Xantrex XHR 600-1.7 repair - Page 1
Forum section: electronics / repair

author: jack075
author_rank: Newbie
timestamp: February 08, 2020, 05:19:17 pm
content: So I have a Sorensen / Xantrex 600V power supply which had a short across STP4NB100 and it took shunt resistor (17) and 2 other resistors(11, 14). Photos attached.The problem as always the schematics are unobtainium.I would really appreciate if someone could help me to identify the resistor. It is possible to check the value without opening the unit through the holes in the cover.

author: Prehistoricman
author_rank: Regular Contributor
timestamp: February 09, 2020, 08:01:36 pm
content: I found someone on DIYaudio forums that has one, he seems active too:threadprofileAlternatively, maybe the people behind this video would know:

author: jack075
author_rank: Newbie
timestamp: February 10, 2020, 06:57:31 pm
content: Thank you very much for your reply. I appreciate your help.

author: Dacke
author_rank: Regular Contributor
timestamp: February 11, 2020, 09:00:44 am
content: I have a couple of Xantrex supplies but unfortunately not that one. It's possible that the charred resistors still measure correctly, it's happened to me a few times so you could try getting a reading from them. Beyond that, the primary on a switch mode power supply has fairly typical values for many resistors depending on their purpose, such as gate resistors that will be fairly low value, usually 47 ohms or less. Try to trace the circuit out and figure out the purpose of those resistors and you may be able to figure out a reasonable value.

author: jack075
author_rank: Newbie
timestamp: February 11, 2020, 08:21:28 pm
content: Thanks for your input. Both resistors have damage. However I managed to read some of the marking and I think the gate resistor could be 24.3 ohms or 243 ohms.Secound resistor has just two outside brown bands so it could be anything. I suspect it would be 15k ohms but not sure.

author: funzt
author_rank: Contributor
timestamp: January 30, 2025, 05:59:25 pm
content: Hello jack 075,do you got schematics for your Xantrex XHR version?is it possible to upgrade my 600-1 (REV 2660) to the 600-1.7 (REV 2600) version?what to change? perhaps you have more pictures from the 1.7A PC-boardsI got an old schematic, not my version PC-boards.I could help with the resistors, but mine is the 600-1 version, not 1.7 A!see foto