hybridfree/eevblog-posts huggingface dataset:
HY3003D-3 Display  - Page 1
Forum section: electronics / repair

author: alecs
author_rank: Newbie
timestamp: December 21, 2023, 09:16:22 pm
content: Hi,anyone knows where can i find one display for this power source (the one on the left)?Is it possible to repair?Thanks.Regards,Alex

author: tunk
author_rank: Super Contributor
timestamp: December 21, 2023, 09:27:45 pm
content: Open it and post photos.If it uses zebra strips it could possibly be fixed by cleaning.

author: alecs
author_rank: Newbie
timestamp: December 22, 2023, 04:33:15 pm
content: Thank you Tunk.Just posted two photos of the display.Alex

author: coromonadalix
author_rank: Super Contributor
timestamp: December 22, 2023, 05:21:49 pm
content: mmm i would check some 3 1/2 digit lcd'syou have an 40 pin dip icl7106 foot print on the pcb .... or maybe MAX7231 ??40 pin lcd driver ....

author: Jwillis
author_rank: Super Contributor
timestamp: December 23, 2023, 08:03:00 am
content: Give the rubber zebra connections a good cleaning with isopropyl alcohol. Note the orientation of each zebra connectors in relation to the board and glass LCD display. Clean the gold traces as well. If the connectors are separated from the glass be careful not to scratch the glass. You will see vary faint conducting stripes on the glass where the connector sits. Just a light cleaning with IP alcohol and reposition the rubber connectors. You can use a small strip of tape on the side of the connector to hold the connector in place. Don't use glue. Re-orientate the the connectors and secure the screws. Should work again. Takes patients and a steady hand but it can be done.

author: Jwillis
author_rank: Super Contributor
timestamp: December 23, 2023, 08:04:53 am
content: Quote from: coromonadalix on December 22, 2023, 05:21:49 pmICL7106 most likely. At least that's what's in the Mastech HY3005-3.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 23, 2023, 01:14:30 pm
content: not sure since they are dmm chip, lots of parts are missing aroundi dont see the other side of the display pcb, is there a blob or something else ?

author: alecs
author_rank: Newbie
timestamp: December 23, 2023, 02:29:26 pm
content: Thank you all for your replies.Coromonadalix, I attached an image of the back of the board.I will try to clean up and see what happens.Alex

author: coromonadalix
author_rank: Super Contributor
timestamp: December 23, 2023, 05:41:35 pm
content: ahhhhhhhhhhh defintely an 3 1/2 dmm chip like 7106now it's a matter fo finding the 3 1/2 digits lcd glass ..... but if youre stuck maybe in this site or elsewhere panel meters with lcd .... some are very cheap on Ali or Ebayhttps://www.circuitspecialists.com/panel-meterssomething could fit the holeunless you find some markings on the lcd glassmany will come with pins, but ones with zebra strips .... harder to findand the other may end up with the same problems ?dont take the ones with some small mcu in them, most of them dont go at zero volts ... start at 3v and up, take ones with the same dmm ic,you can or could find ones with almost the same bezel size and could snap in place ? or do a small adjustment ?
Hyelec HY5003B no displays - Page 1
Forum section: electronics / repair

author: ResR
author_rank: Regular Contributor
timestamp: February 13, 2022, 01:40:24 pm
content: I turned on the mains input power one day and power supply no longer has neither voltage or current display working, but both knobs does control both voltage and current output and the three 3mm LED's are operational, showing output state and CV or CC state. Nothing seemed to be burned as far as I could see inside, didn't find any blown fuses either.

author: ResR
author_rank: Regular Contributor
timestamp: August 15, 2022, 02:54:41 pm
content: Got some free time to take it apart again carefully and fixed, found a faulty zener diode at the upper right corner of the display board that pulled one of the voltage rails below operating voltage, temporary replaced with a bulb._
Hyperion EOS 610i Duo2 Charger: Schematics / Wiring diagramm? - Page 1
Forum section: electronics / repair

author: RK_aus_S
author_rank: Contributor
timestamp: July 13, 2020, 10:52:05 am
content: HiThere was once a company called "Hyperion" that made pretty good all chemistry chargers.Perhaps someone happens to have schemes for the following chargers:Hyperion EOS 610i Duo2Hyperion EOS 720i Super Duo3That would help me a lot. I have a broken one and would like to try a repair.RegardsRoman
Hyundai HPS-600 BMS issue - Page 1
Forum section: electronics / repair

author: Mokko
author_rank: Newbie
timestamp: February 21, 2024, 08:17:45 am
content: Hi there!I have a Hyundai HPS-600 with a 8S 120A BMS that isn't doing what it should be doing, im going to try and give a decent explanation what's going on.This BMS is not outputting anything at all on P- while there is around 20v on C- and 26v on B-, it cannot be charged thru C- while it does take charge thru P- for some reason, all the cells is within 0.01v.What i would like to do is to get this BMS to fire back up or replace it with another one but im not sure what type of communication it does via the 4 pin connector that says "VCC" "SD" "SC" "GND, VCC is obviously power, GND is just ground but is "SD" serial data and "SC" serial communication? Could it be RS-485 or CAN communication? That part (the 4-pin) of the BMS sends power and data to the front panel (that has a SMD and SMC pin) while everything else just looks like a "normal" separate port BMS.I did try to drain the battery fully to see if the BMS would wake up as many other people reports as a working soulution on these but that did not work, i then charged it back up thru P- to get power back into the pack then i also tested to short B- to P- to jumpstart it but as soon as i remove the "short" there is nothing going on again.If i short B- to P- the front panel fires up and both AC and DC out is functional but it reads 1% battery on the display so the BMS is not communicating, however there is about 24v on both "SD" and "SC".Does anyone have any idea what to do or know of some other BMS that i could replace this one with?Best regards from Sweden
I am looking for the Rohde & Schwarz NRV-Z51 service manual.  - Page 1
Forum section: electronics / repair

author: cmu2017
author_rank: Contributor
timestamp: December 30, 2023, 11:16:30 am
content: I have a Rohde & Schwarz NRV-Z51 Thermal Power Sensor which no longer works. It continuously displays -30mW whatever signal I connect to the sensor. And if I zero it I get the message “ERROR ZERO”. I have already searched the internet for a service manual or any information about it to see if I can repair it. But I can't find anything :-(
I am looking for this part (mosfet ?) on an ASUS GTX 1070 GPU - Page 1
Forum section: electronics / repair

author: adrianTNT
author_rank: Newbie
timestamp: March 23, 2022, 12:53:20 am
content: Hello.Can anyone tell me more about this burnt part ? First image is from another card, second image is the burnt oneIt is from an "Asus GTX 1070 dual" video card, part is next to the 6+2 power connector.Someone said it would replace it for me but I would need to find the part.- Where can I buy it ?-Is it different if it says "B20 P03" but something else than "JJD4302" on next line ?- That logo is a certain brand ? Maybe I can find it easier by that.- Does it look from the image that parts next to it or circuit lines are burnt ?- Are the other small parts more common or should I look for those too ?Thank you.

author: fenugrec
author_rank: Frequent Contributor
timestamp: March 23, 2022, 12:55:48 am
content: Possiblyhttps://www.alldatasheet.com/datasheet-pdf/pdf/1138779/EXCELLIANCE/EMB20P03A.htmlYou'll need to look at other components around that area, that may have sustained ( or caused) the damage.Good lukc

author: adrianTNT
author_rank: Newbie
timestamp: March 23, 2022, 01:21:53 am
content: Mine has 4 pins on a side and 4 on the other, the one I seen in the link seems different, no ?

author: fenugrec
author_rank: Frequent Contributor
timestamp: March 23, 2022, 01:28:45 am
content: Indeed, it seems to be a partnumber available in a few different packages. I just pasted the first link without looking closer, when I saw the same logo and a familiar nomenclature of xxPyy which is popular for P-mosfets.I just ran a search for B20P03 herehttps://www.alldatasheet.com/view_datasheet.jsp?Searchword=B20P03&sField=1

author: Venturi962
author_rank: Regular Contributor
timestamp: March 23, 2022, 02:08:10 am
content: You can find the parts and datasheets here:http://www.excelliancemos.com/product_search.php?part_number=B20P03Likely either EDFN3X3, or EDFN5X6 - should be able to measure and confirm.

author: adrianTNT
author_rank: Newbie
timestamp: March 23, 2022, 03:32:16 am
content: They already replied to my email, saying that my image is product "EMB20P03V", I guess "package EDFN 3X3" from that page.What confuses me is that on the above link and when I look for EMB20P03V on their website, I get a datasheet pdf that says EMB12P03V (B12 instead of B20). So not sure what is that.The longer code below B20 P03 seems to be factory code, year code, etc.

author: Venturi962
author_rank: Regular Contributor
timestamp: March 23, 2022, 03:47:45 am
content: Probably just a link issue on the website, that part's datasheet can be found here:https://pdf1.alldatasheet.com/datasheet-pdf/view/1133008/EXCELLIANCE/EMB20P03V.html

author: adrianTNT
author_rank: Newbie
timestamp: March 23, 2022, 04:02:01 am
content: EMB20P03Vit is thenI placed an order on eBay.
I am repairing a hair clipper - Page 1
Forum section: electronics / repair

author: Hextejas
author_rank: Frequent Contributor
timestamp: February 16, 2021, 03:17:22 pm
content: And i made a mistake when reassembling it. I got a polarity wrong and blew a capacitor. I replaced it with one that i had but it is not the exact same. Plus the razor does not seem to have as much power. So can the differences in these 2 capacitors account for the drop in power ?The 16v is the original.Thanks

author: Johnny10
author_rank: Frequent Contributor
timestamp: February 16, 2021, 03:55:46 pm
content: Actually there is no difference between those capacitors.
i bend C XM bender - XM System inc, now SDSautomation  - Page 1
Forum section: electronics / repair

author: bartek102842
author_rank: Newbie
timestamp: June 02, 2023, 10:06:06 am
content: I have a problem with a machine for bending three-dimensional letters. There is an issue with the positioning of the bending element—it doesn't base correctly. After starting the machine, the basing plate moves towards the bending tool, reaches the end, slows down, and continues moving further, as shown in the video.The worst part is that the limit switch is functioning properly, and the computer detects its presence because there is a preview of the output available. The controller for the machine is custom-made for several FPGAs, and there is no documentation available—I have checked.I have inspected the following:End switchesCablesCold solder jointsThe servo is working fine, and there are no error messages. Does anyone have a similar machine or know what could be causing this issue?sds do not want to help me I called them.https://youtube.com/shorts/43mfNpNBp-I?feature=sharehttps://youtu.be/Vapkq7l49nU
I bricked APC UPS SMT2200RM2U - can anyone help me? - Page 1
Forum section: electronics / repair

author: tkamiya
author_rank: Super Contributor
timestamp: February 10, 2023, 04:28:35 pm
content: Hello...I have an UPS by APC, SMT2200RM2U. During firmware update, something went wrong and as a result, it's now a very heavy paper weight. I looked for a flash EPROM but I couldn't find it either. Does anyone know what I can do to re-upload the original version of firmware into this thing?I have multiple SMT2200RM2U so if there is a way, I can read from one and write to this paperweight, also.

author: Swake
author_rank: Frequent Contributor
timestamp: February 10, 2023, 05:51:51 pm
content: No (E)EPROM? Did you looked at both sides of the boards? If still not found the firmware is likely stored in a µController.If you can't find that one then post pictures of the board so we can read the names.You might also look for a SPI interface or similar on the board.

author: CapLeaker
author_rank: Regular Contributor
timestamp: February 12, 2023, 07:32:43 pm
content: There are different versions of the SMT2200. So you just can’t take some dump and flash whatever version on it.

author: asis
author_rank: Frequent Contributor
timestamp: February 12, 2023, 08:33:09 pm
content: Hi,For starters, it would be nice to see the PCB (version: 640-xxxx).And, in the same way, how the firmware was performed.Through which NMC?You can find answers to many questions on the forum.https://community.se.com/t5/tag/smart-ups/tg-p
I broke my PC's USB port by using multimeter for testing my PCB - Page 1
Forum section: electronics / repair

author: bjdhjy888
author_rank: Regular Contributor
timestamp: September 23, 2019, 12:48:28 am
content: jee...I cant believe it...The ports aint working anymore.I guess I shortcircuited it when I test my PCB's jump wires with my multimeter, cuz I did hear my windows 10 made some noise when I did the test... Now it doesn't recognize any plugged in devices.Is it possible to repair the ports?

author: sokoloff
author_rank: Super Contributor
timestamp: September 23, 2019, 12:56:26 am
content: I thought I blew one on my Macbook testing last year's Halloween costume circuits.After a reboot, they came back, so if you've jumped to the conclusion that it's hardware before trying a reboot, try one.

author: magic
author_rank: Super Contributor
timestamp: September 23, 2019, 08:54:29 am
content: What exactly has been shorted to what?

author: nali
author_rank: Frequent Contributor
timestamp: September 23, 2019, 09:13:30 am
content: Quote from: blueskull on September 23, 2019, 12:50:54 amBut not always... Through an unfortunate set of circumstances (and admittedly not enough diligence on my part) I managed to bridge a +12v supply to my Dell laptop's USB V+. Result = magic smoke and a brand new bookend/paperweight.I'm guessing the equipment's supply's current limit was less than the laptop's fuse. I don't know as I was kinda preoccupied at the time.

author: magic
author_rank: Super Contributor
timestamp: September 23, 2019, 09:27:04 am
content: Applying 12V is not something you are supposed to do. By the time the PTC trips, overvoltage is already done to components hanging on the 5V rail in the computer.But USB is supposed to withstand short circuits indefinitely between any of the GND,5V,D+,D- pins. At least that was guaranteed up to gen 2.0; I think they've relaxed the requirements somewhat for the new high-speed lanes.

author: bjdhjy888
author_rank: Regular Contributor
timestamp: September 24, 2019, 12:04:43 am
content: my USB ports are BACK! Thanks to fuses inside.

author: notsob
author_rank: Frequent Contributor
timestamp: September 24, 2019, 12:30:36 am
content: might be an idea to use a USB hub next time - killing that would be better than damaging your laptop
I broke off a GPU capacitor, what should I do? - Page 1
Forum section: electronics / repair

author: BigSaki
author_rank: Newbie
timestamp: July 15, 2022, 07:11:09 am
content: While cleaning my gpu I knocked off multiple capacitors near the gpu die. All the pads are intact and I even have on of the capacitors in a bag. How can I find out what capacitor it was? The gpu is a 1080 ti ftw3 from evga.

author: sahko123
author_rank: Frequent Contributor
timestamp: July 15, 2022, 11:42:45 am
content: Honestly chances are the GPU will run fine. It would only be an issue if you are like perpetually maxing out the gpu while undervolting it (like in mining). But for gaming use the gpu should be perfectly fine. Nvidia would most likely have over-specced the amount of bypassing on the rails so if a few tiny caps fall off it shouldnt be an issue.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: July 15, 2022, 02:02:51 pm
content: may pull a pin to meter it, if it's faulty try to meter its place V, and oscilloscope/else way to get freq.hopefully could figure out whether its function either as- storage- bypass (to filtering or coupling) being || of s.o. intended to solve, which's more often likelythen find onhttps://www.pdfdrive.com/what-is-an-smd-capacitor-e201332265.html

author: alligatorblues
author_rank: Regular Contributor
timestamp: July 17, 2022, 12:00:40 am
content: You can look at the size of the caps. Then look on the board for simlilar sized. Read the values. Those are polymer smd caps. Just get some from digikey or mouser. Unless they're through hole, but those don't usually fall off. Then, you'll need some bluetak and a heat gun. Affix the caps to the board with a tiny piece of bluetak. Use the heat gun to solder, unless you''re good enough to use an iron. You also might want to heat up the others, to make sure they make sure thaey're soldered down good.There's also an over controller you can get that is 120V. You can use a toaster over, and program the controller the way you need to resolder everything on the board. It's a great thing to have for computer stuff, which is forever getting cold solder joints.
I cannot find any information about the SOT23-3 package marking code. - Page 1
Forum section: electronics / repair

author: redneksi
author_rank: Newbie
timestamp: November 25, 2024, 01:22:08 pm
content: I can't find any information about the SOT23-3 packaged marking code.Hello everyone,I can't verify whether a product I shared the image of is intact or not. Because I don't understand what the product is. When I disassemble and measure it, it seems like an NPN transistor, but there is a 40ohm resistance between the collector and emitter. If it was defective, there would have to be a short circuit. I looked at the marking codebooks, but there is no equivalent there either! Can you help me find this component?Thank you everyone in advance.

author: iAleks
author_rank: Regular Contributor
timestamp: November 25, 2024, 02:58:15 pm
content: I couldn't find this component either. Try draw a scheme of this block from pcb, this should make it clear.

author: u666sa
author_rank: Frequent Contributor
timestamp: November 25, 2024, 05:03:18 pm
content: It's a voltage stabilizer, isn't it?

author: Harry_22
author_rank: Frequent Contributor
timestamp: November 25, 2024, 05:43:51 pm
content: ?
I can’t find where to solder a component... - Page 1
Forum section: electronics / repair

author: Andrewlee1739
author_rank: Newbie
timestamp: March 07, 2021, 09:38:53 am
content: I own an Origin EVO 17-s and a 100uf 25v capacitor fell out and I can’t find where it should go. How should I go about finding it’s home? I’ve looked all over for a diagram but I’m unsuccessful. Below are some pictures of the component and the computer it came from. The capacitor says ED(M)105°C (C)18071638 on the other side.

author: Andrewlee1739
author_rank: Newbie
timestamp: March 07, 2021, 09:41:11 am
content: I didn’t realize how small the pictures were. Here they are clearer.

author: Andrewlee1739
author_rank: Newbie
timestamp: March 07, 2021, 09:44:17 am
content: Pic 2

author: Andrewlee1739
author_rank: Newbie
timestamp: March 07, 2021, 09:44:53 am
content: Pic 3

author: The Soulman
author_rank: Super Contributor
timestamp: March 07, 2021, 09:58:40 am
content: If anywhere, I'd suspect near the charger input.Good luck.

author: ogden
author_rank: Super Contributor
timestamp: March 07, 2021, 09:59:07 am
content: You search for review/teardown of your device or similar. Often there's pics of boards.https://www.ign.com/articles/2019/07/22/origin-evo16-s-gaming-laptop-reviewComparing two you can find differences. So expensive laptop and capacitors that are not properly glued. Shame.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 07, 2021, 11:04:29 am
content: Does it still work? If so, are you sure it was ever intended to be attached? How long had you owned the laptop before it fell out?

author: Haenk
author_rank: Super Contributor
timestamp: March 07, 2021, 07:00:37 pm
content: I find the legs surprisingly long, it almost looks like this has not been soldered in (and have its legs cut) at all.

author: ogden
author_rank: Super Contributor
timestamp: March 07, 2021, 07:05:42 pm
content: Quote from: Haenk on March 07, 2021, 07:00:37 pmLook how it's legs are bent. Also look at picture in URL I posted - it lies flat on the PCB. OP's cap was not glued - that's why it fell off.
I get confused so easily - I cannot find this resistor size - Page 1
Forum section: electronics / repair

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 23, 2021, 03:20:26 am
content: Hi again,Sometimes it feels like life is out to get me.Here is a photo of today's dilemma. I have no doubt it will take you 2 seconds to tell me how easy this was to Google or otherwise find out, but I searched for a while on Mouser, Google, DigiKey etc and could not find an answer.Basically as you can see in the photo, I have a 51R0 resistor that measures approximately 9.88mm.However, according to the chart inset, there is no such thing ? 6.3mm is the largest SMD resistor.Why is the resistor in the image nearly 10mm in length and yet according to SMD resistor charts they only go to 6.3mA bit more explanation......without measuring the pads on the PCB, I get the approximate size in the chart....but I'm working in KiCAD and when I put the footprint down it is too small.Maybe the problem lies in the KiCAD footprint sizes?The spec sheets say this is a 1206 size SMD resistor.When I pick that footprint in KiCAD, the footprint is too small.It's like I have to custom make a footprint for this...even though 1206 is a very common resistor size.These kinds of things delay me often and throw hurdles at me. I would imagine no one else has these kinds of problems.It's hard not to let it drive one crazy. I'll bet this is one of those things that requires a special kind of dumb to not figure out.Thanks for explaining and please pardon my frustration.

author: sleemanj
author_rank: Super Contributor
timestamp: October 23, 2021, 03:31:20 am
content: Photo clearly shows you are not measuring the resistor correctly, you seem to be measuring from the ends of the pads, not the ends of the resistor.

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 23, 2021, 03:55:37 am
content: Quote from: sleemanj on October 23, 2021, 03:31:20 amI know.Maybe this is more of a KiCAD question than a SMD resistor question.My apologies.

author: MarkF
author_rank: Super Contributor
timestamp: October 23, 2021, 06:17:54 pm
content: I use Diptrace.And the latest version has three different sizes for SMD passive pads (least, nominal, maximum).See this description:https://www.ultralibrarian.com/2020/12/03/0603-package-footprints-and-sizes-of-smd-passives-ulcIt's the users choice to meet their design requirements.
I have a Hameg Model HM203-6 Oscilloscope that is not workin - Page 1
Forum section: electronics / repair

author: kastell123
author_rank: Contributor
timestamp: May 28, 2020, 07:36:48 am
content: For a better description of the fault, see this video uploaded by me to YouTubeThank you

author: Grandchuck
author_rank: Super Contributor
timestamp: May 29, 2020, 09:12:11 pm
content: Have you checked the supply rail voltages? Perhaps there is some ripple due to bad filter capacitors?Hard to follow the video ... could not see what knobs/controls affected the symptoms.

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 29, 2020, 09:32:37 pm
content: First and main topic on this is here:https://www.eevblog.com/forum/repair/i-have-a-hameg-model-hm203-6-oscilloscope-that-is-not-working/Please drop and get this one locked
I have a powersupply board for TV  -> PD46B2-BDY - Page 1
Forum section: electronics / repair

author: Tony.T
author_rank: Regular Contributor
timestamp: January 26, 2024, 08:23:53 pm
content: I have the board PD46B2-BDYBut internet sais that it is the same as Samsung bn44-00427B ??I cant agree but it is very similar.The Schematic seems to be somehow correct but not the labels...But anywayhttps://pdfcoffee.com/samsung-bn44-00427b-schematic-pdf-free.htmlThe problem is that OVP on the led driver side seems to kick in all the time. FLAG on pin 14 on slc4011m (dont have datasheet on it but found pinout) is high and also ovp1 and ovp2 is high. And then the relay shuts down.Connected 12V....5V directly to the transistors named 12V....5V. And i third powersupply to 85V. (normally 85V)When i turn on 5V...12V the relay clicks. Instead of having 85V produced by the board a use third powerspupply on the 85V rail and start to increase the voltage. As soon i reach 53V the relay clicks and should cut down the switching by shutting og the mains. But as i use external powersupply i can still maintain 53V. The SLC4011M starts to switch as it gets 12V on VCC but now something strange happens. After the diode that is after the coil it gets 380V. Boost converter i know. But this seems WAY to much. That is why OVP kicks in. i have tried to unsolder the mosfets that SLC4011 is switching on by one (green track) and ALL 4 coils ...after their diode gives 380V. When there is no mosfet, i can see switching frequency on the gates (using oscilloscope). But when they are connected i get nothing??? As soon i lower the voltage to 49 V....the relay activates again and no switching is made....no 12V at input on SLC4011M.PSon is NOT activated 5V during the test.I have a spareboard that i can put power on and it is stable. No clicking at all. But this board as soon i just turn it on...it turns on...then off. On again...and continues like this. Restarting all the time.Any ideas what king of problem it can be? if i unsolder the 85V bridge to the coil...the board does not restart. Some kind of problem it is on the leddriver part.... No shortage that i could see. Used thermal camera and nothing gets warm at all.The spareboard that i have...stays 85V after the diode that is after the coil even at standby. But this board boost it to 380V even if PS on is low. and no rebooting. But this board seems to start to switch even with PSon low.... and to 380V and as i said...OVP kicks in.Any ideas?
i have a problem in agilent 34970a  - Page 1
Forum section: electronics / repair

author: coromonadalix
author_rank: Super Contributor
timestamp: August 18, 2021, 05:33:06 pm
content: the problem is the user ....Dont start a thread that way if it's your first, doesn't seem/sound seriousthe 34970a has a service manual available

author: peter1980s
author_rank: Newbie
timestamp: August 19, 2021, 03:51:47 am
content: any details about ur problem?the rather old but classic model for data acquisition.
I have a problem with Hantek DSO4102C - Page 1
Forum section: electronics / repair

author: azemati
author_rank: Contributor
timestamp: August 19, 2023, 10:31:55 am
content: Hello good timeI have an oscilloscope Hantek DSO4102C ,unfortunately, I have a problemit freezes on the QR code while turning on.Please advice meThank you
I have a TV question - Page 1
Forum section: electronics / repair

author: cinque8
author_rank: Newbie
timestamp: May 07, 2024, 02:50:14 am
content: Hello,The attached file shows a device that attaches my Insignia TV to my external antennae. I think I need to replace this item because my TV picture is blurry. What is this item called, and how do I replace it.Thank you.

author: Kim Christensen
author_rank: Super Contributor
timestamp: May 07, 2024, 05:17:15 am
content: Well, the LED isn't on... Is the wall adapter plugged in?You could also try connecting your TV to the antenna directly without this device and see how it performs. Sometimes these amplifiers actually make things worse or do very little to improve reception.I assume it's one of these HDTV amplifiers:https://www.newegg.com/p/05U-0160-00001
I have found Fluke PM6306 RCL calibration command - Page 1
Forum section: electronics / repair

author: mzspring
author_rank: Contributor
timestamp: June 25, 2021, 02:49:51 pm
content: I have found Fluke PM6306 RCL calibration command.I decompiled the FW (PM6306_LCR_Meter_EPROM_v1.5.zip) , so I found Fluke PM6306 RCL calibration command.Operation method (RS-232 interface):step 1 : input HEX 1B 32 0A (ESC 2), go to remote controlstep 2 : input command CAL 1(HEX: 43 41 4C 20 31 0A). format CAL numberNow, I have decompiled FW only a little. I look forward to decompile it together.

author: BravoV
author_rank: Super Contributor
timestamp: June 26, 2021, 01:22:35 pm
content: Thanks for the info.Once calibrated, how to exit the cal mode ?

author: mzspring
author_rank: Contributor
timestamp: June 26, 2021, 03:11:54 pm
content: Sorry, I only finished part of the decompiled work, so I can't solve this problem.

author: alex79
author_rank: Newbie
timestamp: February 11, 2024, 05:16:01 pm
content: Isnt it same as PM6304? According to service manual, see pic.

author: Stray Electron
author_rank: Super Contributor
timestamp: August 25, 2025, 05:40:35 pm
content: Quote from: BravoV on June 26, 2021, 01:22:35 pmNot sure but try Cal 0. (zero)

author: Geek459
author_rank: Contributor
timestamp: September 18, 2025, 12:35:25 am
content: Hi someone has a pm6304 with rs232 and can make a copy of the eprom ?i've done a new pcb of rs232 but i don't have a eprom.Regard.. Claudio

author: bastl_r
author_rank: Regular Contributor
timestamp: September 18, 2025, 01:50:25 am
content: HiI own a 3604.If you can gve a description how to extract the eprom i will read it out.regards

author: Geek459
author_rank: Contributor
timestamp: September 19, 2025, 08:38:19 am
content: Hello, thank you for the reply. To read the EPROM mounted on the RS232 interface, it needs to be removed from the socket and read on an EPROM reader, but the EPROM is in PLCC32 format, so you need to have the adapter. At the moment, I have built a serial interface that captures the display data and intercepts the keyboard data and sends it to the MCU in order to control it from a PC, but I cannot perform the calibration. If you can't make a copy for me, thank you anyway for your availability. Claudio.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 07, 2025, 09:08:34 am
content: ca you post it on normal file sharing like file.ioQQ is not a prefered communication, because some can not registerand you could attach the file here in the thread it should fit ?thks

author: ximao1315
author_rank: Newbie
timestamp: October 09, 2025, 06:04:23 pm
content: Quote from: BravoV on June 26, 2021, 01:22:35 pmHello, could you please provide the complete instructions?
I have some issues regarding the voltage output of the Keithley 6430. - Page 1
Forum section: electronics / repair

author: nanjihai
author_rank: Newbie
timestamp: July 24, 2025, 08:40:52 am
content: I currently have a Keithley 6430 SOURCE METER. The problem I'm encountering is that whenever the set voltage is higher than 190V, the output is always 216V. Do you have the circuit diagram for this instrument?

author: nanjihai
author_rank: Newbie
timestamp: August 01, 2025, 03:56:24 am
content: Perhaps someone has a circuit diagram?

author: inse
author_rank: Super Contributor
timestamp: August 01, 2025, 08:47:13 am
content: “Keithley 6430 Sub-Femtoampere Source-Meter“ ~30k BucksI would not even dare to open the case - did you ask Tek tech support already?P.S. 1fA equals six electrons per second, did I get this right?

author: nanjihai
author_rank: Newbie
timestamp: August 01, 2025, 09:26:52 am
content: It's this source table that has this problem. I haven't found any useful information on the official website. Now I need to fix it.
I need Bk Precision 4086AWG Schematics - Page 1
Forum section: electronics / repair

author: Nuljaska
author_rank: Newbie
timestamp: October 14, 2019, 10:26:07 am
content: Hello. I need this function generator schematics. This generatotor is VFD display version. Thanks

author: Paul Moir
author_rank: Frequent Contributor
timestamp: October 14, 2019, 05:36:01 pm
content: Have you tried emailing them? They were very responsive for me for an old out of support instrument. I was pretty impressed.https://www.bkprecision.com/support/request.html

author: Nuljaska
author_rank: Newbie
timestamp: October 15, 2019, 07:02:08 am
content: I asked for schematics and got answer which just said that the generator is discontinued. :/
I need ERICSSON BML 231 201 PSU modification detail - Page 1
Forum section: electronics / repair

author: TA5FA
author_rank: Newbie
timestamp: October 30, 2018, 10:42:32 am
content: Hi,I have seen ERICSSON BML 231 201 PSU modifications on some of Indonesia's web pages "27V to>> 13,8V modification"Do you have knowledge about model psu modification "ASTEC/EMERSON/ERICSSON BML 231 201"I see some post-modification sales on some web resources, but I haven't found any details.Examples;http://www.modifikasi.com/showthread...thanks-modcom-)https://www.tokopedia.com/darwyscrea...lt?m_id=441132http://adisolo416.blogspot.com/2009/...8-volt_07.htmlIf you have information about the modification I would like your help.Best Regards

author: coromonadalix
author_rank: Super Contributor
timestamp: October 30, 2018, 10:06:47 pm
content: Nice to see your search on QRZ forumsDo you have one on hand ? the thing we need to know is the smps controller in it

author: TA5FA
author_rank: Newbie
timestamp: October 31, 2018, 07:40:10 pm
content: YesI have got 5 qty

author: coromonadalix
author_rank: Super Contributor
timestamp: October 31, 2018, 10:16:00 pm
content: well if you could tear one appart and write all the chip markings, you will surely find an smps driver ic and maybe we will be able to give some toughts

author: TA5FA
author_rank: Newbie
timestamp: April 23, 2019, 08:33:12 am
content: for "coromonadalix"

author: G0MJW
author_rank: Regular Contributor
timestamp: December 07, 2020, 08:12:51 pm
content: Did you ever find the answer to this? I have one I want to modify for 28V

author: YO2LSP
author_rank: Newbie
timestamp: March 17, 2021, 09:12:04 am
content: Hello,Any update regarding this mod? I have 4 pcs and i need to go up at 31V.Thank you.
I need help finding this component - Page 1
Forum section: electronics / repair

author: johny7893
author_rank: Newbie
timestamp: October 30, 2024, 02:53:33 am
content: hey everyone. I have burned out a lutron MACL 153-M and I can't find this component part. There's no datasheet or any info about it. I think it might be a triac but I would like to be able to find a replacement part that can be ordered. This is the marking on it gk01U. I really appreciate any help!

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2024, 03:33:36 am
content: I think the actual part number is 130082 or 130-082, ie a house number.Advice from an ST employee:https://community.st.com/t5/other-hardware/st-micro-part-from-marking-code/m-p/405573/highlight/true#M2814An expired URL says "Original imported 130-082 instead of BTA12-600B 12A 600V bidirectional semiconductor control rectifier TO-220".See these parts:https://vn.world.taobao.com/item/560161448991.htmhttps://ae-pic-a1.aliexpress-media.com/kf/Hb659474f3bc04082b4e3ab4cbb4c427cK.jpghttps://www.google.com/search?q=bta06&newwindow=1&udm=2https://www.google.com/search?q=bta16&newwindow=1&udm=2
I need Help Identifying an electronic component  - Page 1
Forum section: electronics / repair

author: adwdlh
author_rank: Newbie
timestamp: May 16, 2020, 01:03:19 pm
content: I am a newbie. I am trying to fix a front loader washing machine with an error code F22. I took the latch apart to try to test and fix it. I think the part is called (Actuator / Solenoid) has a number on the side 1809 1. It locks and unlocks the door. I have some questions about the part.1) Where would I find a spec sheet on the part?2) How many volts and amps do you need to make the part work?3) Do I have the pins labeled correctly starting right to leftPin 1: Piston outPin 2: Ground?Pin 3: Piston In4) How would I go about testing the part with a Multi Meter?5) If the part is defective where would I find an equivalent part on digikey or similar website.I would like to test the part and find a replacement if needed. I also took apart the CCU. One of the capacitors looks bad. I am not sure if it is the latch or the CCU.Notes:MaytagModel mhwe300vf00Error Code F22Model NumberMHWE300VF00BrandMaytagAge1-5 yearsHi, read thread about error code f22. Replaced latch. Machine started and did 3/4 of a load and gave error code f22 again. Where should I start next? I've read some about a CCU...location? Thank you for any help.• #2F22DOOR LOCK ERRORA Door Lock Error occurs if the door cannot be locked. It will tryto lock it six times before displaying the error code.Possible Causes/Procedure■Door lock mechanism is broken or removed from door.■Door switch/lock unit failure.1. Unplug washer or disconnect power.2. Check door switch/lock unit.3. Check the wire harness connections to the door switch/lock unit and Central Control Unit (CCU).Ok, since you already replaced the door latch lock switch assembly part#WPW10253483, You will want to check the wire harness connections to the door latch lock switch assembly and CCU to make sure that they are not broken or detached. Make sure the connector internal pins are visible.FOR YOUR CCU: Take the top panel off, should be 3 screws on the back of the top panel. Then look at your CCU, and remove the wire connections from it and inspect the wiring in the connectors to make sure non of the pins are broken or burned. Then reset all the connectors back to the CCU and see if that fixes it, if not then your CCU would need to be replaced.Do the same check for the door latch lock assembly wire harness as well.Here's the CCU for your model you can order here:Whirlpool WPW10157481 Cntrl-Elec

author: ArthurDent
author_rank: Super Contributor
timestamp: May 16, 2020, 01:16:39 pm
content: One thing to check is the vertical green capacitor in the middle right on the photo of the circuit board. I'm not sure but it looks like the top is bulging which would be a bad sign. It could be bad.

author: telectric
author_rank: Contributor
timestamp: May 18, 2020, 10:38:57 am
content: Try:https://www.repairclinic.com/for replacement parts here in the USA. But I would follow AuthurDents advise about the capacitor first. Even if it's not the problem it will become one soon.Regards, Tracy
I need help on AWG420 Hard Disk Image - Page 1
Forum section: electronics / repair

author: lugaw
author_rank: Regular Contributor
timestamp: November 05, 2021, 09:12:29 am
content: I acquired a Tektronix AWG420 but the hard disk is broken. Is there a way to get an image for it? Tek support only have an update firmware that needs a working AWG420 OS. Thanks!!

author: lugaw
author_rank: Regular Contributor
timestamp: November 18, 2021, 04:36:08 pm
content: Fixed my AWG420 with the help of DC1MC images he sent and discovered how to make a vxworks bootable drive.More info here.https://github.com/nukem/Tektronix-AWG420-Support-FilesI can now use any drive and format it with FAT16 and FAT32 and vxwork will boot. The old bootloader uses FAT12.
I need help reviving my Lablot LB1102 oscilloscope - Page 1
Forum section: electronics / repair

author: Ratmayor
author_rank: Newbie
timestamp: October 21, 2023, 01:08:42 pm
content: Hello everyone, I'm new to this forum, but I've been reading your posts for quite some time now. A few days ago I bought a Lablot LB1102 oscilloscope (it's basically the same OWON SDS1102) which the first few days worked perfectlybut out of nowhere it just didn't want to turn on again.Because I live in Venezuela and the shipping cost to return it to the seller would be higher than the cost of the oscilloscope itself and I'm not a dishonest guy to tell eBay that the package never arrived so they can send me another one, well, I it's time to repair itThe 5V input is measuring 0 ohms, which shows a serious short circuit. Checking the power circuits, I found that these 2 TLV62130ARGTR regulators have simply died and I would like to know based on your experience, why is this happening? and Are there any other considerations I should take to bring my oscilloscope back to life? (This equipment has some sentimental value, my wife gave it to me on my birthday)

author: samtron
author_rank: Newbie
timestamp: January 21, 2025, 07:03:05 pm
content: Hello Ratmayor,I have the same type of oscilloscope. with the same failure. did you manage to solve the error? what is the solution? Thanks.

author: m k
author_rank: Super Contributor
timestamp: January 22, 2025, 08:30:14 am
content: Hanmatek DOS1102 also, maybe many with 1102 in their name.Should widen the possibility of deeper manual?

author: samtron
author_rank: Newbie
timestamp: January 22, 2025, 05:07:46 pm
content: i am experiencing the same issue with my oscilloscope as Ratmayor described. From one day to the next, there was a short circuit on the main board. I would like to know if they managed to repair it.
I need help to rapair sr620 - Page 1
Forum section: electronics / repair

author: nanjihai
author_rank: Newbie
timestamp: July 15, 2025, 02:53:44 am
content: My instrument reported an error 17 upon startup, which is related to counter channel two. I have no idea how to locate the problem or which areas I should pay attention to.

author: nardisk
author_rank: Contributor
timestamp: July 15, 2025, 07:36:00 am
content: Yes, we have already talked about your problem and there are also the diagrams. Do a search, the problem is in channel 2.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 15, 2025, 07:54:31 am
content: geezhttps://www.eevblog.com/forum/repair/repair-sr620-(schematics-wanted)/msg4479316/#msg4479316

author: nanjihai
author_rank: Newbie
timestamp: July 15, 2025, 09:05:58 am
content: thanks

author: nanjihai
author_rank: Newbie
timestamp: July 15, 2025, 09:08:35 am
content: I have looked up the circuit diagram, but I don't understand where the fault of the counter in channel two lies. I suspect that the chip CP82C54Z is broken.

author: nanjihai
author_rank: Newbie
timestamp: July 17, 2025, 08:50:09 am
content: 屏幕显示的读数一直在不停的跳动，灯也是，请问有人真的什么原因吗

author: coromonadalix
author_rank: Super Contributor
timestamp: July 18, 2025, 03:23:42 am
content: Quote from: nanjihai on July 17, 2025, 08:50:09 amENGLISH FORUMtranslatedThe reading on the screen keeps jumping, and so does the light. Does anyone know why?
I need help with this smd component (SOLVED) - Page 1
Forum section: electronics / repair

author: Jorge12
author_rank: Newbie
timestamp: May 17, 2021, 08:53:37 pm
content: Hello,No matter how hard I tried, I could not identify either the manufacturer or the type of component shown in picture. I assume it is a mosfet but I have never seen components marked with this KS logo. Any ideas?

author: fzabkar
author_rank: Super Contributor
timestamp: May 18, 2021, 06:52:38 am
content: Can you identify the date codes on other chips? I suspect that "6224" may be some kind of date code, but it would help to see the chip in the context of its surroundings.

author: Jorge12
author_rank: Newbie
timestamp: May 18, 2021, 07:33:16 am
content: Quote from: fzabkar on May 18, 2021, 06:52:38 amThe component is part of a circuit board found inside a brand new plasma pen. Given its location near the primary of the voltage-elevating transformer I think it is a drive mosfet. The thing that surprises me is the difficulty to know the manufacturer based on the part logo, evidently I'm getting old and/or there are too many (chinese?) manufacturers around...

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: May 18, 2021, 02:20:51 pm
content: Here you go my friend:http://www.kwansemi.com/uploadfile/2020/0610/KS6224DA.pdfEdit: Gotta love their website:"Kwansemi semiconductor is a technology driven integrated circuit and the power semiconductor device chip design company, by more than a dozen us/German/Japanesesea turtlesand core technology research and development personnel was registered in 2010 in Taiwan, with a registered capital of one hundred million new Taiwan dollars, the company headquarters is located in hsinchu science park in Taiwan."Yes, here in good old Germany, even the sea turtles are innovative. Hell, every time they emerge from theicywarm waters of the north sea, we gotta stop them from founding semiconductor companies by the dozens.True story.

author: Jorge12
author_rank: Newbie
timestamp: May 18, 2021, 04:06:41 pm
content: Quote from: BreakingOhmsLaw on May 18, 2021, 02:20:51 pmThat's it, you're the man!Thank you very much :-)

author: xrunner
author_rank: Super Contributor
timestamp: May 18, 2021, 04:27:29 pm
content: Quote from: BreakingOhmsLaw on May 18, 2021, 02:20:51 pmWhoever was in charge of their news posts got tired of that job about 3 years ago.http://www.kwansemi.com/index.php?m=content&c=index&a=lists&catid=49

author: amyk
author_rank: Super Contributor
timestamp: May 19, 2021, 12:09:35 am
content: That hilarious translation is this idiom:https://en.wikipedia.org/wiki/Haigui

author: Jorge12
author_rank: Newbie
timestamp: May 19, 2021, 07:00:53 am
content: Quote from: amyk on May 19, 2021, 12:09:35 amAwesome. I was just wondering what sea turtles have to do with this semiconductor company!This brings me to another story...it seems that the Chinese born in the motherland call bananas those Chinese born on Italian soil (because they are yellow on the outside and white on the inside)...but this definitely has nothing to do with semiconductors...
I need somebody to repair my 4 Tek 465's in the LA/OC area. - Page 1
Forum section: electronics / repair

author: tekguy465
author_rank: Newbie
timestamp: October 30, 2019, 12:37:19 am
content: I need somebody to repair my 4 Tek 465's in the LA/OC area. If you know anybody you can recommend, that would be much appreciated.Thanks!
I need the firmware of PM6304 - Page 1
Forum section: electronics / repair

author: mzspring
author_rank: Contributor
timestamp: September 13, 2021, 12:31:01 pm
content: I need the firmware of PM6304. Who can read a copy for me?27C512 EPROM firmware data

author: coromonadalix
author_rank: Super Contributor
timestamp: September 13, 2021, 02:22:49 pm
content: would be nice to be more specific like a Fluke PM6304 LCR meter ...

author: mzspring
author_rank: Contributor
timestamp: September 13, 2021, 02:45:47 pm
content: 27C512 EPROM firmware data

author: mzspring
author_rank: Contributor
timestamp: September 16, 2021, 02:16:01 pm
content: 27C512 EPROM firmware data

author: picburner
author_rank: Frequent Contributor
timestamp: September 16, 2021, 06:08:19 pm
content: You are satisfied! The firmware version is v1.5I have not found anything better on the net.

author: mzspring
author_rank: Contributor
timestamp: September 18, 2021, 12:39:57 pm
content: Thank you. I'll test it

author: mzspring
author_rank: Contributor
timestamp: September 23, 2021, 02:26:58 pm
content: PM6304 Error 36Calibration factor 52 out of limits

author: coromonadalix
author_rank: Super Contributor
timestamp: September 23, 2021, 10:35:48 pm
content: well it may tell the lcr will need to be calibrated ??At the first place why did you need the eeprom content, did you mess something up ??

author: mzspring
author_rank: Contributor
timestamp: September 24, 2021, 12:34:45 pm
content: Data in firmware of 27C512 EPROM is lost.Later, I wrote V1.5 firmware data to 27C512 EPROM firmware.Turn on PM6304 and display "Err 9" on it.I calibrated PM6304, but failed, and "Err 36" was displayed.
I post lots of repair videos + some free 3D print stuff - Page 1
Forum section: electronics / repair

author: Segasonicfan
author_rank: Newbie
timestamp: February 10, 2024, 03:11:48 am
content: Hi EEVblog peeps!I'm realizing I haven't been too active here, but I'm a long-time lurker and lover of this forum!I have a small YouTube channel where I post most of the repairs I do, (ad-free, no patreon or anything) to help out the community:https://www.youtube.com/@segasonicfandesignsI hope to post more here, as my schedule allows as well. It's always nice to help people fix thingsI have some older videos on the ZD-985 and my Fluke, but not a ton of equipment stuff.I did design (remix) these very nice 3D printed o-scope lead holders though ^_^https://www.thingiverse.com/thing:6283459-SSF

author: Koray
author_rank: Regular Contributor
timestamp: February 10, 2024, 06:37:02 am
content: Wow! Lots of great work there! Subbed already. How come your channel has stayed so obscure?K.