hybridfree/eevblog-posts huggingface dataset:
Help identifying an ST IC.  - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 19, 2019, 02:33:52 am
content: I got a keyboard with a faulty PCB and have been trying to figure out what IC is this one. If it is a processor, gate array or what... but cannot find a datasheet anywhere.

author: fzabkar
author_rank: Super Contributor
timestamp: August 19, 2019, 04:24:21 am
content: I can't help, but here is another discussion:http://www.dubrovenko.ru/ddssite/forum/viewtopic.php?t=232Resources:https://cloud.mail.ru/public/czC3/qw8fu5otT

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 19, 2019, 06:10:44 am
content: Exactly it. From an mAudio board. Thanks for that.The dream SAM9708 is the DSP. Feels like the ST could be processor as it has crystal beside it. Would be good to have a datasheet to test some of the pins.There is an implementation of the same DSP that uses the same memory setup herehttps://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQ272wPem32-LuGsEk-7yJt0wdYh9lrOmAl_iXHn5TgrtaHudPgI can get clock out of pin 91 so I believe its internal oscillator is working. But apart from that no other pulse. It could be fried of stuck on HALT or RESET. I am not sure... need to investigate more.

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 19, 2019, 08:57:30 pm
content: The DSP is held in RESET by ST PI12.When I bypassed the RESET so I would not go LOW the DSP booted up and there was activity on the memory busses and on the op amps.The ST PI12 seems dead. The only activity I get out of it is it's oscillator running the crystal at 8MHZ.But that is all. Did a bit of research on ST micro-controllers but could not find anything that could match what would supposedly be the VCC & VSS.

author: fzabkar
author_rank: Super Contributor
timestamp: August 23, 2019, 12:05:00 pm
content: Is your mystery chip the ST92163 in your other thread?https://www.eevblog.com/forum/repair/st92163-ic-reset-stuck-on-low/msg2636550/#msg2636550http://pdf.datasheetcatalog.com/datasheet/SGSThomsonMicroelectronics/mXuuwxv.pdf(datasheet)

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 23, 2019, 02:53:37 pm
content: Yes it is. Have you been working on this board as well?

author: fzabkar
author_rank: Super Contributor
timestamp: August 23, 2019, 06:06:36 pm
content: Quote from: gkmaia on August 23, 2019, 02:53:37 pmNo, I've just taken an interest in your thread.

author: magic
author_rank: Super Contributor
timestamp: August 23, 2019, 07:40:43 pm
content: Check supply rails and electrolytics.If it's some oldschool MCU, one capacitor may implement an RC delay circuit resetting it on power up. Those things sometimes go bad.

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 23, 2019, 10:27:55 pm
content: I ended up implementing it like that. The cap is 20uf and it takes around a 1 sec to charge up and bring the RESET threshold to HIGH. Probably a 10uf would reduce the time but I do not have one here.Anyway it works fine. Only bad side is if the rail goes up there is nothing to turn the IC off anymore.But was a nice little trick anyway!
Help identifying and locating resistor - Page 1
Forum section: electronics / repair

author: buckwheat
author_rank: Newbie
timestamp: August 19, 2022, 03:26:21 pm
content: I am trying to identify this device (WSR-2). From my research, I believe it is a current sensing resistor. It is on a Magneti-Marelli ECU last produced around 2000. Any help is appreciated!

author: mariush
author_rank: Super Contributor
timestamp: August 19, 2022, 04:07:15 pm
content: If it's same as the other on the right, it's Dale WSR-2 series resistor , 0.649 ohm 1%wsr datasheet :https://www.vishay.com/docs/30101/wsr.pdfmarking :https://www.vishay.com/docs/30327/pms-pmpmarking.pdf2 is most likely 2w rating

author: buckwheat
author_rank: Newbie
timestamp: August 20, 2022, 03:59:54 pm
content: Thanks for that, I ordered a replacement and I'm going to attempt the repair. Do you know what coating would be applied over the top of this? I can't tell if it is a spray or brush on, it has a tacky feel to it.

author: mariush
author_rank: Super Contributor
timestamp: August 20, 2022, 04:06:23 pm
content: No idea, but you should also figure out why it blew in the first place .. check for shorted mosfets, diodes that are open both ways etc

author: wasedadoc
author_rank: Super Contributor
timestamp: August 20, 2022, 06:08:58 pm
content: Quote from: mariush on August 20, 2022, 04:06:23 pm+1. There has been a lot of current through that resistor. It didn't just fail all by itself.
Help identifying audio amplifier IC's - Page 1
Forum section: electronics / repair

author: Gominalo
author_rank: Contributor
timestamp: February 22, 2021, 02:52:37 pm
content: Hi all,I've been messing around with an old portable iphone doc (Logitech Pure-Fi Express Plus) that doen't plays any audio from the aux input, only scratch when i move the power jack and i don't know some of the IC's. I think the one that is repeated is an OP amp (D4558) and the other a dig pot for the volume control (N1A46J0R).This speaker uses a TDA7491LP for the audio amplification. Any help would be fantastic.Thank you.

author: madires
author_rank: Super Contributor
timestamp: February 22, 2021, 03:40:25 pm
content: Check the power supply and then follow the audio signal, starting at the aux input.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 22, 2021, 05:06:19 pm
content: What's all the dirt/contamination?

author: Gominalo
author_rank: Contributor
timestamp: February 22, 2021, 05:12:42 pm
content: Quote from: madires on February 22, 2021, 03:40:25 pmI checked the ics supplies and in one of the supposed op amps is half (arround 5v or less).

author: Gominalo
author_rank: Contributor
timestamp: February 22, 2021, 05:13:44 pm
content: Quote from: JohnnyMalaria on February 22, 2021, 05:06:19 pmThat dirt looks like cloth fibers or dust.

author: fzabkar
author_rank: Super Contributor
timestamp: February 22, 2021, 07:28:08 pm
content: The D4558 is a dual op amp. The manufacturer is Silicore (CHMC).http://www.silicore.com.cn/product/272.htmlFM62429. dual channel electronic volume control:http://datasheet.elcodis.com/pdf2/76/14/761466/fm62429.pdf

author: Gominalo
author_rank: Contributor
timestamp: February 23, 2021, 05:21:03 am
content: Quote from: fzabkar on February 22, 2021, 07:28:08 pmThank you a lot!Do you think D4558 could be replaceable with the LM1458? I still have to double check but seems to have one of them bad.

author: fzabkar
author_rank: Super Contributor
timestamp: February 24, 2021, 08:48:58 pm
content: I suspect it is a general purpose op amp, so I would think an LM1458 would be OK.

author: magic
author_rank: Super Contributor
timestamp: February 25, 2021, 06:03:36 pm
content: It's probably a 4558 type opamp so a notch above 1458. Try to find RC4558, NJM4558, BA4558, something of that sort.

author: archil
author_rank: Contributor
timestamp: March 16, 2021, 10:13:35 am
content: just find datasheets.

author: gamalot
author_rank: Super Contributor
timestamp: March 16, 2021, 11:39:24 am
content: The model number of volume control IC is FM62429, not N1A46J0R.http://file1.dzsc.com/product/16/04/16/1106295_104145462.pdf
Help identifying buck controller please - Page 1
Forum section: electronics / repair

author: ManCave
author_rank: Regular Contributor
timestamp: January 07, 2025, 10:25:35 pm
content: Hi, I've taken apart friends galaxy projector that stopped working. Could you please help identifying the buck controller from whatever is left of the original? It's used to step down 5V to drive the projector diode. It's likely few hundred mA...I'd appreciate any help.Thanks!

author: DavidAlfa
author_rank: Super Contributor
timestamp: January 07, 2025, 11:56:15 pm
content: OCXSemi OC5022B maybe?CN datasheet.https://www.aliexpress.com/item/1005006942949681.html

author: ManCave
author_rank: Regular Contributor
timestamp: January 08, 2025, 11:15:58 am
content: Thank you, will have a look!

author: ManCave
author_rank: Regular Contributor
timestamp: January 20, 2025, 08:59:36 pm
content: That was it!!! Working again. Thanks again for help!!
help identifying burnt component - Page 1
Forum section: electronics / repair

author: JeffJS
author_rank: Newbie
timestamp: March 02, 2022, 10:14:36 pm
content: the numbers that are still legible are 56-16. this is on my wind turbine mppt charge controller. what happened is my solar controller is hooked to same battery storage and it suddenly started sending full voltage from solar panels which was 64v on a 24v system. the back feed burnt this component before I could disconnect. this is the only part that look bad so I was hoping replacing it will get it back up and running.

author: bob91343
author_rank: Super Contributor
timestamp: March 03, 2022, 12:29:06 am
content: Probably a transistor. Measure the leads to see if it looks like one electrically. I don't imagine it's a high frequency one nor a high voltage one so you could take a chance and replace it with something close.

author: gamalot
author_rank: Super Contributor
timestamp: March 03, 2022, 12:39:13 am
content: Try BCX56-16

author: bostonman
author_rank: Super Contributor
timestamp: March 03, 2022, 02:01:27 am
content: Silly question, but did you try looking with a magnifying glass? It looks like the first half is burnt, but a number or two is still visible.Although, a good chance it's a code rather than an actual part number.In any case, sometimes having just one or two is better than nothing because many on here are well experienced and can solve the mystery easier with something to go by.

author: JeffJS
author_rank: Newbie
timestamp: March 03, 2022, 02:14:20 am
content: that sure looks like it- thank you!

author: JeffJS
author_rank: Newbie
timestamp: March 03, 2022, 02:17:12 am
content: Quote from: bostonman on March 03, 2022, 02:01:27 amI did and that's how I got the 56-16 number. Any numbers preceding is burnt.

author: bostonman
author_rank: Super Contributor
timestamp: March 03, 2022, 02:28:15 am
content: Ah okay.I was assuming you got those numbers by looking without a magnifying glass.

author: JeffJS
author_rank: Newbie
timestamp: March 03, 2022, 04:01:57 am
content: Quote from: bostonman on March 03, 2022, 02:28:15 amit is also marked Q1 on the board I ordered a bcx56-16 to try

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 03, 2022, 11:56:57 am
content: I've no knowledge on 56-16but prefix got onhttps://www.electronics-notes.com/articles/electronic_components/transistor/transistor-codes-numbering.phpanyone clarify magic 56-16 ?
Help identifying capacitor value/marking?  - Page 1
Forum section: electronics / repair

author: eyeknowaghost
author_rank: Newbie
timestamp: April 04, 2021, 08:15:44 pm
content: Hello, there is a damaged capacitor (as if a screw grazed it and kind of tore off a corner???) on a graphics card i got a good deal on, it still works and it is not experiencing any issues (Yet) but I really want to replace it. I do have the technical ability and the tools to accomplish this job (preheater and proper soldering equipment).The capacitor in question is an aluminum polymer that is marked “925u-1200-2.5”. I take this to indicate the capacitor is a 1200uF 2.5v capacitor, and 925u being the series/batch code. Am i wrong in thinking this? I actually have a bunch of exact replacements (nichicons) for this capacitor (although it is marked slightly differently “1 2 2” it is INDEED a 1200 if 2.5v capacitor. The first number indicates one, the second number indicates 2 the third number in that series is a multiplier of 100 so 12x100 = 1200 uF. I have confirmed this to be true from the manufacturer of the replacement caps and also they test at 1200uf on my capacitance meter. So my question is would i be safe to assume the original caps are 1200uf and would the replacement caps be a GOOD replacement? Included below are links to photos of both original andreplacement caps. The originals are slightly blurry and the replacements are marked “FP”. And if so, should i replace all of the caps in this section with the so they are all of the same brand/series? And yes they are the same physical size.Original capacitorshttps://app.photobucket.com/u/y0uhateme/p/a98731cf-7293-4d9a-9bb0-1de99ce4c29dReplacement Capacitorshttps://app.photobucket.com/u/y0uhateme/p/08bd2bb4-10d5-45a3-a2dd-cb60bcba3087
Help identifying chip model - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: August 21, 2025, 12:09:44 am
content: The chip model is E5V0 or E5VO, which may be an ESD protection chip or something similar.I want to know its exact model.Can anyone tell me?Thanks

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 21, 2025, 02:17:47 am
content: 1min googling.CPDA10R5V0U-HF
Help identifying component. - Page 1
Forum section: electronics / repair

author: gmc
author_rank: Regular Contributor
timestamp: March 12, 2020, 11:52:36 pm
content: I'm busy trying to repair a 5V/12V/-12V SMPS and need help identifying one of the components. I'm fairly sure its a TL431 but that's just a guess.Its used on the output section of the PSU and looks like provides some feedback for the 5V tail. The center pin is connected to ground which makes me think its a TL431. Pin 1 is connected to 5V via a resistor divider, and pin 3 looks like it driving a opto-coupler.Does anyone recognise this? Is the S the logo of the company? My google skills are failing me on the manufacturer. Also can't find any transistor called CZ050 hence me guess at a TL431.

author: amyk
author_rank: Super Contributor
timestamp: March 13, 2020, 12:15:43 am
content: Almost certainly a '431, especially given the description of how it's connected.

author: gmc
author_rank: Regular Contributor
timestamp: March 13, 2020, 02:43:40 pm
content: Thanks. Thought as much.I replaced it with a working TL431 and its fixed the issue.
Help identifying component - Page 1
Forum section: electronics / repair

author: ollihd
author_rank: Regular Contributor
timestamp: August 11, 2022, 02:15:43 pm
content: Hi All,Can anyone help me identify what this component is?

author: tanveerriaz
author_rank: Contributor
timestamp: August 11, 2022, 03:33:30 pm
content: 2SD1664
Help identifying component SOT23-6 [HSCU] - Page 1
Forum section: electronics / repair

author: kkontak
author_rank: Contributor
timestamp: December 15, 2024, 10:46:50 am
content: Hi.Does anybody identify this SOT23-6 component?Marked as HSCU, it is powered by 3.3V and connected to I2C bus, next to an eeprom.pinout1 - SCL2 - ?3 - SDA4 - GND5 - 3V3 (one of them could be logic input)6 - 3V3 (one of them could be logic input)It could be just protection diodes or some fancy pull-up resistor network, or a temperature sensor because the device shows the board temperature but the whole thing is controlled by a STM32F107 ARM which by itself has its own temperature sensor.Thanks

author: u666sa
author_rank: Frequent Contributor
timestamp: December 15, 2024, 12:59:42 pm
content: Seeing it next to coil, I reckon it is a buck converter.Now go figure what part it is.

author: kkontak
author_rank: Contributor
timestamp: December 15, 2024, 01:11:27 pm
content: Sorry for the confusion.The inductor is part of the 12V to 5V step down converter, which is build around another IC, not shown in the picture.There is also another step down converter for the 3.3V on the other side of the PCB.But the HSCU is not part of any of the power converters.

author: fzabkar
author_rank: Super Contributor
timestamp: December 15, 2024, 05:26:23 pm
content: 24AA025E48T-I/OT, Microchip, 2-Kbit I2C Serial EEPROM, 1.7V-5.5V, marking HSxx, SOT23-6:https://ww1.microchip.com/downloads/aemDocuments/documents/MPD/ProductDocuments/DataSheets/2-Kbit-I2C-Serial-EEPROMs-+EUI-48-or-EUI-64-Node-20002124.pdfhttp://markingcodes.com/search/c/HSxxhttps://ae-pic-a1.aliexpress-media.com/kf/Saa2cb31f92c64cf78fdc274772ce5d9eZ.jpg(photo)

author: kkontak
author_rank: Contributor
timestamp: December 15, 2024, 06:28:13 pm
content: Thanks, that fits, even though it's strange to have another serial eeprom besides the 24C.
Help identifying components on and induction stove repair - Page 1
Forum section: electronics / repair

author: minisamus
author_rank: Newbie
timestamp: May 21, 2019, 10:32:06 pm
content: I'm having difficulty identifying a zener diode on a Samsung induction range inverter board, and would really appreciate any help.I've attached a photo of the diode. It appears to be SOD-123 size, and the only component which I can find with the 'ZB' marking on it in a SOD-123 package is KDZVTR18B. I don't think it is this component since it doesn't have the 3 bar markings on it. There are lots of other spec'd components for other package sizes, with the most consistent specs being for an SOD-323 part (BZT52C6V8).

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 22, 2019, 01:26:57 am
content: The datasheet of the KDZVTR18B states under the drawing merely, that the MARKING BAR indicates the location of the cathode, not that is must or will be always made up of three stripes.
help identifying connector - Page 1
Forum section: electronics / repair

author: topcat
author_rank: Contributor
timestamp: May 05, 2019, 11:07:51 pm
content: hello all.Can anyone tell me what this is? I searched as best as I can for Molex or Sabre type but I don't find anything with the rounded edges and so large?Thanks.

author: topcat
author_rank: Contributor
timestamp: May 05, 2019, 11:08:56 pm
content: front and back full mug shot style.

author: JimG
author_rank: Newbie
timestamp: May 05, 2019, 11:59:03 pm
content: try TE mate-n-lock plug and headerhttps://www.te.com/usa-en/search.html?q=04p%2Bumnl&source=header

author: topcat
author_rank: Contributor
timestamp: May 08, 2019, 09:27:07 pm
content: Thanks mate!
Help Identifying Diode - Page 1
Forum section: electronics / repair

author: Generalquark
author_rank: Contributor
timestamp: February 03, 2021, 04:03:06 am
content: Hi,I was wondering if anyone knows how to find out what type of diode this is. I did some looking around, but could not find anything specific. It did look like Vishay bought General Semiconductor that the symbol on the diode shows. Attached is a picture of the diode. Does anyone have a great resource for identifying components such as this one that I am unaware of.

author: fzabkar
author_rank: Super Contributor
timestamp: February 03, 2021, 04:22:48 am
content: It could be an SMBJ6.0A unidirectional TVS diode:https://www.vishay.com/docs/88392/smbj.pdf

author: bdunham7
author_rank: Super Contributor
timestamp: February 03, 2021, 04:38:35 am
content: Maybe 1SMC14A ?

author: fzabkar
author_rank: Super Contributor
timestamp: February 03, 2021, 04:43:14 am
content: Quote from: bdunham7 on February 03, 2021, 04:38:35 am"14A" is a date code.https://www.vishay.com/docs/88912/diodesgroupbodymarking.pdf

author: bdunham7
author_rank: Super Contributor
timestamp: February 03, 2021, 04:48:38 am
content: OK, maybe not!

author: Generalquark
author_rank: Contributor
timestamp: April 25, 2021, 01:57:59 am
content: It was a SMBJ6.0A, but it was directional. Thanks for the help!
Help identifying electronic component - Page 1
Forum section: electronics / repair

author: asp
author_rank: Regular Contributor
timestamp: January 11, 2021, 05:58:46 pm
content: HiDid anyone come across this component? I have no idea what it is. It's in a PSU on the low voltage side, that I would like to repair. As you can see in the picture part of it is blown. It's a SC70-6Thanks

author: amyk
author_rank: Super Contributor
timestamp: January 12, 2021, 01:10:12 am
content: R3150N015F ? Very tentative match from famous Russian site, ignoring 'G' (since that is likely to be a logo), although I am highly doubtful.

author: fzabkar
author_rank: Super Contributor
timestamp: January 12, 2021, 02:26:09 am
content: I think it would be useful to see a photo of the PCB so that we could get some context.

author: asp
author_rank: Regular Contributor
timestamp: January 12, 2021, 09:00:22 pm
content: I will try to get some pictures. thanks. will also check the ricoh to see if the pins match
Help identifying fusible resistor - Page 1
Forum section: electronics / repair

author: nr4ps
author_rank: Newbie
timestamp: December 28, 2023, 05:09:02 pm
content: Hello, I have a Vizio TV power supply board that went bad. Two shorted diodes and a blown IC that I can replace easily enough but then there’s what I believe to be a fusible resistor (labeled R915 on the board) that I’m not sure how to interpret. It’s a little hard to read but I believe it says F1/2J 4.7ohm FU44H. Not sure what wattage replacement to get. Does the F1/2J part answer that question?

author: fzabkar
author_rank: Super Contributor
timestamp: December 28, 2023, 05:16:36 pm
content: My searches suggest it's 2 watts and manufactured by Futaba.https://www.tokopedia.com/lacidiyers/resistor-futaba-2-watt-pilih-1-pcs-75-khttp://www.futaba.com.tw/categories/category_view_en/144http://www.futaba.com.tw/downloads/RFB.pdfhttp://www.futaba.com.tw/categories/category_view_en/140http://www.futaba.com.tw/downloads/RF%5B1%5D.pdf
Help Identifying IC - Page 1
Forum section: electronics / repair

author: sfernandes
author_rank: Newbie
timestamp: February 28, 2020, 03:54:24 am
content: Hi,The IC is from a Sony XAV-68BT Car Touchscreen Stereo It sits inside the unit right up against the back of the heatsink, I'm not sure if it's a power MOSFET or the amplifier, but it has two holes blown in it and the stereo will not power on just more smoke comes out of the part. I can't identify it because the burns removed some of the markings. Anyone have any ideas? I have attached a picture of the blown IC.

author: helius
author_rank: Super Contributor
timestamp: February 28, 2020, 07:21:07 am
content: It looks like a STA50013. How many pins does the package have?

author: sfernandes
author_rank: Newbie
timestamp: February 28, 2020, 08:53:59 pm
content: Here is better pictures.

author: sfernandes
author_rank: Newbie
timestamp: February 28, 2020, 08:56:50 pm
content: more pictures

author: sfernandes
author_rank: Newbie
timestamp: February 28, 2020, 08:57:49 pm
content: another picture of the bottom

author: sfernandes
author_rank: Newbie
timestamp: February 28, 2020, 09:00:23 pm
content: looks to be 25 pins, but not an expert so not sure if I'm correct.

author: amyk
author_rank: Super Contributor
timestamp: February 29, 2020, 12:34:35 am
content: https://www.eevblog.com/forum/chat/pure6001h-datasheet/Note, a TDA7850 should also work, they have the same pinout and according to the datasheet nearly everything is the same except for the quiescent current (one is very slightly higher.)Edit: found even more pin-compatible amps, see pinout "Y" in this catalog:https://www.st.com/resource/en/selection_guide/sgaudiopow0315.pdf
Help identifying LCD  - Page 1
Forum section: electronics / repair

author: Robski
author_rank: Contributor
timestamp: July 07, 2020, 05:51:07 am
content: It is monochrome LCD I need to replace but there's nothing about the model number or manufacturer. It has flat 15 pin connector. Back light is separate supply with ccfl tube. I posted some pictures. The machine model is SAC-F4S.The closest one I can find is this one:https://fsshijie.en.alibaba.com/product/60475361775-803277332/640x480_VGA_Monochrome_15_pin_9_4_inch_LCD_Display_LM64P839.htmlBut its over 100USD so I don't really want to risk that much in case it doesn't work.http://imgur.com/gallery/99fRDb2

author: ajp8868
author_rank: Regular Contributor
timestamp: July 07, 2020, 08:24:11 am
content: Bit of a longshot but these might have a screen with a model number on or even a spare screen.. Is this the same interface unit?https://www.aesintl.com/equipment-services/manufacturer/elettromeccanica-carra/t1340b/

author: fzabkar
author_rank: Super Contributor
timestamp: July 08, 2020, 01:49:23 am
content: Here is the datasheet and pinout for the Sharp LM64P89 & LM64P839 panel:https://elektrotanya.com/sharp_lm64p839_lcdpanel_datasheet.pdf/download.htmlhttps://www.beyondinfinite.com/lcd/Library/Sharp/LM64P839.pdfThe 3 power pins appear to be in the right place.Dimensions:http://www.bitsavers.org/components/sharp/Sharp_LCD_Panels/LM64P89.pdfWARNING: See page 55 of the following manual:http://support.elmark.com.pl/advantech/pdf/PCA-6153man.pdfPin #7 (VEE) is the "external power" pin. The voltage requirement is -20V for the LM64P89 panel.LM64183P -17VLM64P89 -20 V

author: Robski
author_rank: Contributor
timestamp: July 23, 2020, 02:34:45 am
content: Thanks for that I will go and check the voltages before buying anything.
Help identifying LED Driver IC - Page 1
Forum section: electronics / repair

author: lmagalhaes
author_rank: Contributor
timestamp: October 07, 2021, 09:24:15 am
content: Hey there,I have some LED power supplies that I want to debug to learn a bit more, but I can't find the driver IC datasheet anywhere. The IC is a 6 pin SOT-23 like with "CB879" marking on top. I have been searching mouser for drivers similar, but most of the drivers I see are boost converters. This one is rated for 60-90Vac in 40-55VDC out.I have some power supplies that hiccup after 63V and others that are working just fine. I probed the gate of the output MOSFET, on the ones that are working fine, the frequency is constantly changing but the duty cycle stays fairly the same across the 60V~90V input voltage, but on the ones that hiccup, the duty cycle is very close to 100% right at the 60V input voltage and then, when the output starts flashing, the gate goes from the normal behaviour to a much lower frequency with a very small duty cycle. Going back to the 62V at the input stops the flashing completely.

author: gamalot
author_rank: Super Contributor
timestamp: October 07, 2021, 09:56:27 am
content: https://pdf1.alldatasheet.es/datasheet-pdf/view/1133451/FEELING/FP7175LR-G1.html

author: xavier60
author_rank: Super Contributor
timestamp: October 07, 2021, 10:58:05 am
content: It might be useful to be aware of this Supertex part, now Microchip.https://ww1.microchip.com/downloads/en/DeviceDoc/20005588A.pdfNot a drop in replacement but functionally the same.I would sometimes rather get new boards made using Microchip parts instead of trying to source the originals.

author: lmagalhaes
author_rank: Contributor
timestamp: October 07, 2021, 03:05:29 pm
content: You're a life saver gamalot ! Could figure out that what was faulty was this IC ... replacing the IC with a known good one solved the hiccups, other boards that were overheating and other problems...
Help Identifying missing 0402 capacitors - Page 1
Forum section: electronics / repair

author: AstutePauciloquent
author_rank: Contributor
timestamp: December 08, 2024, 12:18:19 am
content: Hi everyone, I have this older Geforce PCX Albatron 5750 with 3 missing 0402 capacitors that I need help determining their value. Yes this is an old card that is not really worth anything, but the reason for doing this is purely for the fun of learning, and making something work again, and as far as i know this card was purchased years ago and it arrived faulty so its never been used. Apart from when i tested it (it posts, but locks up the system, after 5 seconds). I have the tools, skill and knowledge, including a microscope in-order to solder the replacements caps on. As ive been able to remove and reattach these tiny caps in order to measure their capacitance.I know the basics of how to read schematics and I have boardview software, however im not able to locate such resources for this card. I’ve tried looking at similar types of cards in boardview software, but everything is just to modern compared compared to this.I’ve read somewhere that its probably ok to just attach some capacitors that are similar values to the surrounding ones, but how true can that really be? these are located on the back of the card. I have included to images, one being a close up.

author: MathWizard
author_rank: Super Contributor
timestamp: December 08, 2024, 05:18:54 am
content: They might be for a chip on the other side of the PCB, it might be for some high speed serial chip for the PCI-E bus.If you could narrow down what circuit the caps were from, with a DMM, like a local Vcc supply cap, or part of some RC sensing network like for a step-down regulator, or just a DC blocking cap for some AC signal path. If it was for some near by chip, it might not be that hard to guess a rough value, or find a similar value in a datasheet example circuit.There's always some risk that more damage could be done I suppose, but you could just try 10nF caps, and see if it runs then. 100nF caps are probably the most common on the whole thing, for all the Vcc lines to all the IC's.On the 2 GPU's I've tinkered with, there weren't that many sub 1nF caps. Actually iirc one of them is an AMD/ATI HD5770. It's overheating, IDK why, the fan works, but it does make it into windows, before overheating. I've ordered a good Logic Analyzer, but it's stuck in the mail. But yeah now that I know a bit more digital stuff, I look forward to tinkering with that again.I would try my best to find what circuit it's part of, so what is it connected to, and what are they connected to, then guess a size, but 1 or 10 or 100nF would probably get a lot of circuits working. If needed, I'd solder some thin wire to those pads, then tape or glue the wires down, then go around trying to find, if possible, it might not be, where those caps go.

author: usagi
author_rank: Frequent Contributor
timestamp: December 08, 2024, 07:05:10 am
content: Try 100nf, it either works or it doesnt.

author: little_beast
author_rank: Newbie
timestamp: December 08, 2024, 01:46:18 pm
content: good luck
help identifying missing component??? 6pin ic (voltage regulator?) - Page 1
Forum section: electronics / repair

author: bigjoncoop
author_rank: Regular Contributor
timestamp: July 22, 2021, 05:02:30 am
content: hey guys,the other day while trying to solder some wires onto some teeny tiny pads, I accidently got some solder onto some legs of an IC and while trying to remove the solder I accidently ruined the IC... Grrr... This board definitely uses some of the smallest size components.I'm fairly certain that the IC in question is a voltage regulator. and of course there no markings on the IC and pictures of the board online also show nothing...If someone could maybe let me know if this voltage regulator has multiple outputs like 3.3v and 5v or only one... (if the component is a voltage regulator)and if it does have multple outputs, any traces leading to the main processor on the board should be 3.3v and the other output should be 5v correct?Board Info and Pictures-This board is from a "Foxeer Mix" which is a FPV Camera With onboard 1080p DVRThis board takes from 5v-24v input

author: lordium
author_rank: Regular Contributor
timestamp: July 22, 2021, 08:06:25 am
content: Looks like a richtek switching regulator or similar. RT8258, RT8259 or something like that. If you could determine which pins connect to where it could help narrow it down (GND/VCC/EN/FB etc). Guessing inductor is on the other side of the PCB. I saw another FPV with same chip (V35MA) with this layout but the IC (your IC) was marked C3JG (richtek likes C3xx).EDIT: No I think it's likely not this... I see more V35MA designs, they usually have this IC close to it. Once marked C3JG and another time "11A E07". Traces don't seem thick enough to support that power of the required regulator (nor proximity of inductor).

author: fzabkar
author_rank: Super Contributor
timestamp: July 22, 2021, 09:19:07 pm
content: The 32-pin IC appears to be a quad buck regulator (Power Management IC). You should be able to measure the 4 supply voltages at its adjacent inductors.I'm wondering whether the 6-pin IC might be a PSU supervisor, or maybe an ESD protection device. If it's the latter, then the camera should work without it.Are any of the IC's pins connected to Video or OSD? Which pin is grounded? Is any pin connected to any of the 4 inductors? If so, then that would be the Vcc pin.

author: bigjoncoop
author_rank: Regular Contributor
timestamp: July 29, 2021, 10:59:34 pm
content: @fzabkar@lordiumhey guys thanks for your help on this.I will do some pad tracing and give as much detail as possible.@fzabkari will try to power up the board and see what happens. currently there is a tiny resistor missing ( i think is a resistor) *picture below* what's your thoughts on that? the one next to it is still in place. should i measure it and replace the missing one with same value? ( the issue is, that these resistors and most components on this board are some of the smallest possible. Grrr...)As is when 12v applied to the board it only consumes 0.009amps. i would like to replace the resistor and try to power up the board again and see if it works with that missing ic like your stated.
Help identifying mosfet - Page 1
Forum section: electronics / repair

author: David60639
author_rank: Newbie
timestamp: April 20, 2020, 03:00:29 am
content: Hey guys, I bought an old oscilloscope on CL that did work and found 2 burnt mosfets. Google was not much help with the part numbers. Any help is much appreciated.

author: ColeLamothe
author_rank: Newbie
timestamp: April 20, 2020, 04:19:16 am
content: Not having much luck with just the chip. What is the make/model of the scope? it may be easier to track down an old parts list or schematic with that information.

author: WattsThat
author_rank: Frequent Contributor
timestamp: April 20, 2020, 04:39:22 am
content: They are not mosfets, the are unobtainium bipolar Tektronix parts in a 22xx series scope. 100% custom, no 2N numbers for those puppies. Early production model too, second week of 1987 for the transistors, they added heat sinks later on.Why makes you say they are fried? Have you looked at the schematic? There are two diodes in the circuit that can make the in-circuit readings look odd. Don’t remember exact what it is but can research it if it matters. What are the symptoms? Any lights at all? Totally dead?More info required.
Help identifying one component on DSO6000 oscilloscope - Page 1
Forum section: electronics / repair

author: super_electron
author_rank: Contributor
timestamp: March 21, 2021, 12:52:40 am
content: Hi folks,I need help in identifying the part shown in the picture below. The picture is of DSO6054 oscilloscope motherboard ch1 input bottom side. I do think it is an -5V LDO but can't find anything with the part number on the web. The part number is "H3B". Please help

author: ataradov
author_rank: Super Contributor
timestamp: March 21, 2021, 12:59:41 am
content: AD8033AKS
Help identifying part - Page 1
Forum section: electronics / repair

author: Helix70
author_rank: Unknown
timestamp: October 23, 2023, 06:19:04 am
content: Anyone know what CP3 is? It is part of an optoisolator digital input circuit.

author: ataradov
author_rank: Super Contributor
timestamp: October 23, 2023, 06:30:19 am
content: Capacitor array.It looks like it is setup as two series capacitors. I'm not sure this even saves the board area. It is possible that they were just trying to reduce BOM item count.Although connection to D9 is strange, so may be they are using it as 3 series capacitors.

author: Helix70
author_rank: Unknown
timestamp: October 24, 2023, 01:16:16 am
content: Ahh, thanks, that makes sense.The diodes are fast switching double diodes and are configured as a full wave bridge rectifier. The capacitor array is wired so there is a capacitor across each diode, I guess to limit EMC.
Help identifying part - Page 1
Forum section: electronics / repair

author: ukamak
author_rank: Newbie
timestamp: October 23, 2023, 06:53:40 am
content: Anyone know the partname / maker / datasheet of that component?It's a green-power PWM controller similar to SG6848 , LD7535 , OB2262

author: fzabkar
author_rank: Super Contributor
timestamp: October 25, 2023, 12:55:54 am
content: This one is a head scratcher.FWIW, I notice that CR6853 (not your mystery IC) is compatible with all 3 of your alternative parts:https://www.quartz1.com/price/PIC/410N0195116.pdfQuoteMore ...https://www.semiee.com/file/backup2/HSMC-H6850.pdf(H6850)https://file.yizimg.com/937/2008100904504721.pdf(CMD2264)https://u.dianyuan.com/upload/space/2013/01/24/1359029490-775856.pdf(PL3563 / PL3563A)To complicate matters even further, I notice that the Pb-free versions of the LD7535 and LD7535A have a leading character which looks like a logo, but which is actually an embossed year code:https://www.google.com/search?q=ld7535+OR+ld7535A&tbm=ischhttps://file.remont-aud.net/baza/ic_power/sm_data/LD7535_data.pdf(datasheet)I suspect that your PWM controller may be a popular part which has been copied by many manufacturers. That seems to be what happens in China.
Help Identifying Resistor type - Page 1
Forum section: electronics / repair

author: mayavending
author_rank: Newbie
timestamp: May 24, 2023, 09:37:59 pm
content: Hi, I trying to repair a control board for a vending machine Vendo brand, the board came with a short circuit in the main power supply. I removed these components and the short circuit disappeared. At first glance, they look like resistors, but I believe they function as a fuse. Can someone help me identify these components with commercial name? Greetings.

author: ataradov
author_rank: Super Contributor
timestamp: May 24, 2023, 09:56:06 pm
content: Looks like 0.5 Ohm resistor. You would need to provide dimensions to tell the exact package type.It would be strange if they are used as a fuse. It is more likely that they are used as a current sensor, and they passed a bit more current that they are designed to handle.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 25, 2023, 01:55:01 am
content: even removed your short circuit is still / could be there .... you should check before putting new resistors, they may break again .....
Help identifying Resmed Air Mini Power connector - Page 1
Forum section: electronics / repair

author: John_K
author_rank: Newbie
timestamp: October 06, 2017, 01:09:05 am
content: Does anyone recognize this power connector or have any advice on how to identify it?

author: jpinnix
author_rank: Newbie
timestamp: November 15, 2021, 07:22:57 pm
content: Hey, did you ever find out what connector this was? I'm also searching for this Resmed Airmini power connector.
help identifying SMD component marked N1 - Page 1
Forum section: electronics / repair

author: tony359
author_rank: Frequent Contributor
timestamp: May 15, 2022, 08:37:41 pm
content: Hi there,I am trying to repair an SMPS (PS3) an I have a component which reads differently when compared to a working PSU.It's only labelled N1 and it says Q304 on the PCB - so maybe a transistor?Does the N1 tell me anything about the specific item?Thanks!

author: Audiorepair
author_rank: Frequent Contributor
timestamp: May 15, 2022, 09:05:47 pm
content: http://www.marsport.org.uk/smd/mainframe.htm

author: tony359
author_rank: Frequent Contributor
timestamp: May 16, 2022, 01:44:42 pm
content: amazing website! Thank you!

author: gamalot
author_rank: Super Contributor
timestamp: May 16, 2022, 02:17:54 pm
content: It looks like RT1N141C:https://pdf1.alldatasheet.com/datasheet-pdf/view/238994/ISAHAYA/RT1N141C.html

author: fzabkar
author_rank: Super Contributor
timestamp: May 16, 2022, 05:02:24 pm
content: Quote from: gamalot on May 16, 2022, 02:17:54 pmIt does match the photo on this site:https://www.mscnelectronics.com/home/produto/codigo:14669/smd-transistor-rt1n141c-t112-1-pnp-with-resistor-for-switching-application-silicon-npn-epitaxial-type-transistors-smthttps://www.mscnelectronics.com/upload/Produto14669.media.bb6e4fd4e46b5bd88a4ef006d7b7cc6f.jpg

author: gamalot
author_rank: Super Contributor
timestamp: May 16, 2022, 05:32:30 pm
content: Quote from: fzabkar on May 16, 2022, 05:02:24 pmYes that's why I said "it looks like"
Help identifying SMD diode - Page 1
Forum section: electronics / repair

author: Daybear63
author_rank: Newbie
timestamp: July 23, 2020, 07:14:04 am
content: By a stupid mistake i managed to hook up my Tomtom XXL GPS to 12v and blew a SMD diode on the pcb.I borrowed a XXL from a friend and could see the diode was marked B, but i could not find any info on that particular SMD diode. On the working unit the voltage across the diode was measured to 4.58v.The unit with the blown diode would not turn on but the power light turns on (green led in the bottom of the GPS)Could someone help me to identify this diode or suggest a equivalent replacement?

author: Audiorepair
author_rank: Frequent Contributor
timestamp: July 23, 2020, 07:40:36 am
content: I would guess a 4.7v zener.But that's just a guess.

author: fzabkar
author_rank: Super Contributor
timestamp: July 24, 2020, 08:00:55 pm
content: I suspect that it is a 5V TVS diode. These usually go short circuit when they experience an overvoltage. Is it O/C or S/C? Normally you should be able to remove such diodes without affecting the operation of the circuit. There appears to be an inductor between the 5V USB supply and the cathode.

author: aqibi2000
author_rank: Regular Contributor
timestamp: July 24, 2020, 09:34:54 pm
content: With the diode removed measure the impedance across the pads on the PCB(Ensure it’s not used a zener to produce a crude voltage reference)Then try with the correct power supply
Help identifying SMD from Samsung microwave control panel - Page 1
Forum section: electronics / repair

author: thatawesomeguy
author_rank: Newbie
timestamp: June 30, 2019, 11:22:54 am
content: I had a cockroach manage to crawl in behind the control panel of the microwave and blow out the board.I figured rather than send it to e-waste if I can identify the blown component I may as well have a crack at repairing it.Unfortunately all the ICs and SMD components appear to have their numbers and information removed, the only identifying information I can find near the affected components are PC 01 & PC 02.Pictures attached below

author: keymaster
author_rank: Regular Contributor
timestamp: June 30, 2019, 11:50:08 am
content: Some kind of optocoupler maybe .

author: coppercone2
author_rank: Super Contributor
timestamp: July 01, 2019, 12:55:14 am
content: and you still want to use that microwave?there is vaporized roach guts everywhere etc. utterly disgusting.good thing the blood of that cock roach recharges my energy to hold off on building more circuits till I can get tight chassis design manufacturing capability.no exposed conductors on working circuits

author: fzabkar
author_rank: Super Contributor
timestamp: July 01, 2019, 02:56:47 am
content: I agree that they're both optocouplers. PC01 appears to be providing voltage feedback for the DC power supply, while PC02 appears to be sensing the AC mains cycles, possibly for the RTC.

author: thatawesomeguy
author_rank: Newbie
timestamp: July 01, 2019, 03:57:15 am
content: That makes sense, I did consider that PC may have stood for Photocoupler and it does appear to bridge the high side with the logic side.That said, this still may be in vain as I have no ifea the electrical characteristics of the original parts.

author: fzabkar
author_rank: Super Contributor
timestamp: July 01, 2019, 06:04:10 am
content: Can you see a part number if you scrape away the conformal coating?
Help identifying SMD transformer - Page 1
Forum section: electronics / repair

author: CTD
author_rank: Newbie
timestamp: October 15, 2024, 11:51:18 pm
content: I'm repairing a very expensive Honeywell temperature controller, and ran into a shorted transformer. It's part of a VFD display board, so I'm assuming used to generate the needed voltages to drive it.It's the 8-pin part labeled 006 YW (and 006 YX- on an identical board).I can't seem to find any information on it, does anyone know how to identify it?Thanks.

author: inse
author_rank: Super Contributor
timestamp: October 16, 2024, 05:49:22 am
content: Might become difficult, probably it’s a custom wound transformer.I have little hope that spare parts are made available by the manufacturer.If you have a functioning unit, measure the required voltages.Is there space to bodge in a separate converter module?

author: CTD
author_rank: Newbie
timestamp: October 16, 2024, 08:25:12 pm
content: That's unfortunate. I guess the best option is to try and pick up a dead one off ebay for the display board/transformer. The one I'm working on seems to have been victim of a power surge or incorrect voltage. The power supply board had burnt parts all over but was fairly easily repaired. Thankfully the logic board didn't suffer any damage and is the only one that changes with the specific part number so sourcing the display part is fairly easy.

author: Harry_22
author_rank: Frequent Contributor
timestamp: October 16, 2024, 09:00:22 pm
content: Quote from: CTD on October 15, 2024, 11:51:18 pmHi!How did you determine that the transformer is shorted?The probability of such parts failure is very small.

author: inse
author_rank: Super Contributor
timestamp: October 16, 2024, 09:11:46 pm
content: The way the board looks, the transformer is toast…

author: CTD
author_rank: Newbie
timestamp: October 16, 2024, 09:13:21 pm
content: Desoldered it and compared with the one on a good board. It has continuity between pins that are not connected to each other on the good one. If you look at the picture, the transistor near the coil was completely burnt, lifting the soldermask.

author: Harry_22
author_rank: Frequent Contributor
timestamp: October 17, 2024, 11:01:37 am
content: Would you like to disassemble and rewind it?I can try to disassemble a similar one to understand how it works. It seems to have a ferrite O-ring around the spool.
Help identifying SOIC-14 IC in power section of Miele ELP330 dryer board (T8623C - Page 1
Forum section: electronics / repair

author: anquifer
author_rank: Newbie
timestamp: April 06, 2025, 04:02:27 pm
content: Hi everyone,I'm trying to identify a burned SOIC-14 IC on a power supply board from a Miele tumble dryer (model T8623C). The PCB reference is ELP330, and the IC in question is completely unreadable due to damage.From what I can tell, it's part of the primary side of the power supply. It sits close to the following components:A flyback transformer labeled KA 32107An optocoupler CNY75GCWhat seems to be a TL431 shunt regulatorA nearby MOSFET marked “8P” (possibly 8N60 or similar)A resistor marked “1R00”, likely a current-sense resistorThere is also a large electrolytic capacitor nearby, suggesting it’s handling the main DC rail.The IC itself is in SOIC-14 package, which excludes most of the common 8-pin PWM controllers (like UC3842, ICE2QS03, etc.). Based on surrounding components, I believe it’s a PWM controller with current mode or voltage mode feedback, or possibly a power management IC with more advanced features.🛠️ I’ve attached detailed close-up photos of the board and the area in question (see below).If anyone has worked on this board before, or can suggest possible IC part numbers that are commonly used in this context, I’d greatly appreciate it!Thanks in advance 🙏Antonio

author: wraper
author_rank: Unknown
timestamp: April 06, 2025, 04:19:01 pm
content: PCB photos I googled are quite blurry but I'm pretty sure it's TEA1522T, certainly made by NXP.https://www.ebay.com/itm/203456639152

author: anquifer
author_rank: Newbie
timestamp: April 06, 2025, 05:04:54 pm
content: Hello.Thank you in advance for your quick response.I analyzed the datasheet of the IC TEA1522T and the pinout matches.Also, if we look at a photo of the broken IC with better definition (attached), we can see that the letters that can be seen coincide with the reference you mention: "T....2T".I will order this IC, replace it and then give you feedback.Thank you very much.