hybridfree/eevblog-posts huggingface dataset:
Identify non-standard components. - Page 1
Forum section: electronics / repair

author: keerthi123
author_rank: Contributor
timestamp: September 13, 2020, 09:12:59 pm
content: Hi all,I am new to the field and curious whether how can identify a components with short code if google doesn't return anything. As an example, attached IC (J8 FD) has few letters and nothing return when google.Appreciate your support.

author: shakalnokturn
author_rank: Super Contributor
timestamp: September 13, 2020, 11:09:18 pm
content: High frequency?In those cases I turn to Taobao.You need to identify the package, (knowing function can help too) search with package name and marking codes, confirm with pictures.

author: fzabkar
author_rank: Super Contributor
timestamp: September 13, 2020, 11:28:38 pm
content: RT8204LZQW, Richtek, Single Synchronous Buck Controller, 0.75V to 3.3V, marking J8, WQFN-16L:https://www.richtek.com/assets/product_file/RT8204L/DS8204L-04.pdf

author: keerthi123
author_rank: Contributor
timestamp: September 14, 2020, 08:47:08 am
content: Quote from: shakalnokturn on September 13, 2020, 11:09:18 pmWhat are marking codes?

author: keerthi123
author_rank: Contributor
timestamp: September 14, 2020, 08:59:40 am
content: Great informationHow did you convert "marking J8, WQFN-16L" into IC number?

author: drussell
author_rank: Super Contributor
timestamp: September 14, 2020, 09:13:41 am
content: Quote from: keerthi123 on September 14, 2020, 08:47:08 amEdit:to add additional quote:Quote from: keerthi123 on September 14, 2020, 08:59:40 am"Marking Codes" means that code that is written on the package.Because many SMT components are so physically small, they don't have room to realistically write out the whole part number on the chip, so manufacturers assign short identifier codes instead (which are usually indicated and explained in the datasheet for the component.)The trick is when you need to reverse those short "codes" back into actual part numbers, you need to figure out what part number the code (in this case J8) refers to, and there are often many totally different parts from various manufacturers that all use the same short marking code. Therefore, there are many websites that try to provide cross-reference lists with the marking code, package type, etc. so you can try to work backwards and figure out what something actually is....In this case, even googling the marking code and package type (J8 WQFN-16L) returns the likely proper result. The biggest trick is often being able to specify both the codeandpackage style.
Identify old diesel generator - Page 1
Forum section: electronics / repair

author: Zarhi
author_rank: Contributor
timestamp: April 02, 2025, 10:48:54 am
content: Hello everyone,I have old diesel generator, but cannot identify it.Looking for model/manufacturer, service/user manual for engine.Do someone recognize this machine?

author: BradC
author_rank: Super Contributor
timestamp: April 02, 2025, 11:34:01 am
content: Contact Onan. They're still around.

author: Andy Watson
author_rank: Super Contributor
timestamp: April 02, 2025, 11:36:31 am
content: Do search engines not work in your country?It's an "Onan" - quite a respectable supplier of generators. They make/made many different versions with options specified by the customer, so tracking-down your exact model may be difficult. This manual looks to be close to your machine:https://onan.xmsi.net/967-0341%20Onan%20DJC%20Operator's%20and%20Parts%20Manual%20(1-1975).pdfPage 7 shows how to breakdown the model number.
Identify part to Repair board - Page 1
Forum section: electronics / repair

author: esinior
author_rank: Contributor
timestamp: April 22, 2025, 08:47:46 am
content: HiI have a HUAWEI PAIA power supply and it has two smd part that i couldn 't identify and found any datasheet for them. The first is marked "S1D30" or "S1C51" or "S1B07" (in different boards) with package SOT23-6 and second is "N3868V" with SO-8 package ( i think it is like N3867V Synchronous Rectification Controller), i will upload pics of the board and partswho can help me what are these parts?
Identify potentiometer 4K7109M - Page 1
Forum section: electronics / repair

author: okw
author_rank: Frequent Contributor
timestamp: August 06, 2025, 08:38:40 am
content: I'm trying to find the D shaft potentiometer in the picture, but can't find it anywhere (Mouser, RS, etc.) when I filter on 4.7k.Google gives me nothing on the inscription 4K7109M.There is a logo, but I'm not familiar with it.Anyone knows manufacturer? Or even down to part number?The body is approx. 16x18mm and shaft length (including body) is approx. 40mm. Body including one nut but seems to be 11.4mm. D-shaft.

author: wraper
author_rank: Unknown
timestamp: August 06, 2025, 08:50:37 am
content: Looks like Piher PC16

author: okw
author_rank: Frequent Contributor
timestamp: August 06, 2025, 09:11:56 am
content: Quote from: wraper on August 06, 2025, 08:50:37 amThanks, it does. Are they available in metal D shaft?The ones I find are plastic knurled.

author: wraper
author_rank: Unknown
timestamp: August 06, 2025, 09:16:24 am
content: They certainly do exist with a metal shaft. You could try altering a part number with options required according to the datasheet and google to see if it's available.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 06, 2025, 09:20:32 am
content: PC16SV-10IP16-472A2020-TADigikey has it.Is it necessary to be metal?
identify resistor specs - Page 1
Forum section: electronics / repair

author: onyaw
author_rank: Newbie
timestamp: January 16, 2023, 01:34:07 pm
content: Dear EEV,Would anyone be able to identify what kind of through-hole resistor (specs, rating) is in the attached pictures? Its name is apparently R28 on a board from a Crest_on AAE unit that was damaged during a power surge. The component take in regular A/C but also passes 24V network power across other components but it doesn't turn on. It is on a board that sits between the power inputs and the main transformer and is the only piece that appears damaged. Even though the component is >20 yrs old, the company refuses to help ("classified"). Like I am a legal risk or competitor!To me it looks like a wirewound power resistor, with the 4 band colors brown-gold (or yellow) - brown - brown but this does not make sense and the colors are faded/dull so this guess is probably wrong. I am also not sure about Watts rating i'm told maybe 5W. See pics with flash on, off and view of the board.I have a replacement unit that works, but i want to try to fix this one anyway first replacing this piece, but would rather not damage it further by trying the wrong component.Thanks for your help

author: madires
author_rank: Super Contributor
timestamp: January 16, 2023, 02:25:38 pm
content: I'd guess 1x0 Ohms (the color of the second ring is burned crisp) and 2W, maybe fusible. Simply measure it with a DMM! BTW, the large electrolytic cap is bulging and needs to be replaced.

author: ebastler
author_rank: Super Contributor
timestamp: January 17, 2023, 07:38:57 pm
content: Why don't you measure (or photograph) the resistor in the undamaged replacement unit?Looks like quite a bit of heat damage on that board, including a partially molten connector. How long did that "power surge" last?

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: January 18, 2023, 04:10:58 pm
content: Is the last color band Black? Looks black on one pic and gold on another.If it is. it signifies a wire wound resistor, looks possible in a PS.Also if it is wire wound and if it is not totally blown open, you may be able to get a decent value by measuring it
Identify Resistor Type and Wattage - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: October 09, 2024, 09:04:45 pm
content: Hi, I have the below resistor on a working power supply where I measured it 120Kohm and I would like to replace it for preventing reasons (the colors on the image don't show very good but they match with the measured 120Kohm value). I believe it is a metal film resistor but what watt do you believe is?The voltage difference across the resistor is 293V and the current 2.4mA P=V*I293V*0.0024A~0.7W. What watt do you suggest to choose... for my designs always I choose the rating wattage to be the double from the working watt?I found the below:CPF3120K00FKE14https://eu.mouser.com/ProductDetail/Vishay-Dale/CPF3120K00FKE14?qs=AgiByKCM3cCJwbXOor8fIg%3D%3DCarbon Film Vs Metal Film Resistorshttps://components101.com/articles/carbon-film-vs-metal-film-resistors

author: fzabkar
author_rank: Super Contributor
timestamp: October 12, 2024, 12:03:23 am
content: Is this the startup resistor that powers the main PWM controller IC from the rectified mains? If so, then your replacement resistor is fine, although probably overkill for this application.

author: 2X
author_rank: Frequent Contributor
timestamp: October 25, 2024, 07:59:08 pm
content: Thank you very much for the reply.
identify resistor value in circuit board Arc Welder - Page 1
Forum section: electronics / repair

author: ferrisd65
author_rank: Newbie
timestamp: July 05, 2023, 10:17:03 pm
content: BP Raptor 2001 BP00880Arc Welder problem (no display, no power light)Resistor IdentityCircuit Board 1/2W5R (See Picture)https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-codeBrownGreyBlackBrownGreen= 1.8k ohm +/- 0.5 %OrGreenBrownBlackGreyBrown= 51G ohm +/- 1%the resistor measures "open Loop" with a multimeter

author: Andy Watson
author_rank: Super Contributor
timestamp: July 05, 2023, 11:34:32 pm
content: As it says on the PCB 1/2W5R It is a 1/2 watt 5 ohm resistor (actually 5.1\$\Omega\$.)Green = 5Brown = 1Black = 0SILVER = x 0.01Brown = 1% tolerance.So 510 x 0.01 = 5.1\$\Omega\$
Identify RF transistor, UHF antenna distributor - Page 1
Forum section: electronics / repair

author: Vicus
author_rank: Regular Contributor
timestamp: October 04, 2021, 10:22:27 am
content: Hi, I need some help in identify this transistor. I desoldered (and yes ripped up a pad) to test it. 42M is the mark on the top of it. It's a 4 pin sot with the top left wider. The bottom right and the upper left pad are gnd. I think that it's fried because I measure 12ohm from what appear to me like the collector and the emitter. Of course I have ho signal on the output. The product is a "T bone free solo antenna distributor". It sould buffer or slightly amplify an antenna input and distribute it on 4 output. 5V from a 7805 is the psu.I can't find any possible transistor, the package also seem unusual.Thanks.PS the picture is upside down. I don't know why it rotate during upload.

author: shakalnokturn
author_rank: Super Contributor
timestamp: October 04, 2021, 11:58:45 am
content: Package could be a variant of SOT-143.I haven't searched with marking codes.Try searching Taobao with sot-143 (b/r) and 42M see if that comes up with any UHF/wideband BJT's.Edit: The NXP BFR and BFG are the first examples that come to mind.

author: Vicus
author_rank: Regular Contributor
timestamp: October 04, 2021, 03:21:28 pm
content: I do identify this:https://www.tme.eu/Document/4af7f3725e1f0dabe5f62a4ed081108d/BFU630F.pdfbut I really don't know how rf transistor work. Does the base doesn't need a bias current like standard bjt transistor?

author: TheMG
author_rank: Frequent Contributor
timestamp: October 04, 2021, 03:34:33 pm
content: It could very well be an integrated RF amplifier, not just a simple transistor. It would have the required biasing circuitry internally, and only need to be supplied DC power decoupled from the RF output, and that appears to be what's happening here (unless there's more going on outside the picture, can't see where that DC trace is going, does it go direct to the power supply or are there some biasing resistors in series?).Unfortunately I haven't had any luck with that SMD marking.But yes, an RF transistor would need proper biasing to operate in the linear region.

author: Vicus
author_rank: Regular Contributor
timestamp: October 04, 2021, 06:55:36 pm
content: It goes straingt to the 7805.So it could be this one:https://www.infineon.com/dgdl/Infineon-BGA427-DS-v01_01-en.pdf?fileId=db3a304314dca3890115418dca4d1638

author: Vicus
author_rank: Regular Contributor
timestamp: October 04, 2021, 07:17:38 pm
content: This one seems bettere but still not exactly the same.I have to measure the R bias.

author: Vicus
author_rank: Regular Contributor
timestamp: October 06, 2021, 11:55:37 am
content: Ho R bias in the PCB. I'll try with this one:https://www.mouser.it/datasheet/2/412/SPF5043Z_Data_Sheet-1500773.pdf

author: Vicus
author_rank: Regular Contributor
timestamp: October 22, 2021, 08:54:24 pm
content: The oem degner replay of my email. They say it's an Agilent MGA-53543 and of course il discontinued. So I did order some Qorvo SFP-5043 and they works fine.
Identify schematic for an audio receiver, probably Pioneer - Page 1
Forum section: electronics / repair

author: hanakp
author_rank: Regular Contributor
timestamp: August 07, 2024, 02:36:24 pm
content: I got a schematic of some (probably) audio receiver, but there is no type or manufacturer identification. I googled the assemblies and it seems it's a Pioneer product, but I couldn't find the type. All schematics are in long paper strips, maybe 25x80 cm. I'm attaching one of them. Thanks.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 07, 2024, 03:06:16 pm
content: Pioneer A-7https://archive.org/details/manual_A7_PIONEER/page/6/mode/2up
Identify SMD K7K - Page 1
Forum section: electronics / repair

author: jaltagracia
author_rank: Newbie
timestamp: August 27, 2020, 02:43:08 am
content: Hi,I have an ultrabook with motherboard Samsung Series 9. During a battery replacement I knocked down a partI took pictures in case I lost it, which I didand know I'm trying to buy it and put it back.It belongs to a motherboard model AMOR-2-13-MONO REV 1.0 NY BA41-02132A. I had no luck on this board schematics. It goes next to the 6 pin component. The attached picture shows how it should look installed.The part code reads like K7K with KK dater code and it's a 3 pin SMD.May be this parthttps://www.digikey.com/product-detail/en/on-semiconductor/2N7002K/2N7002KCT-ND/2060375but I'm not sure and would like to confirm this is the correct part.

author: jaltagracia
author_rank: Newbie
timestamp: August 27, 2020, 03:00:12 am
content: Hi,I also found this one that looks more acurate by the markings on the Datasheet.https://www.digikey.com/product-detail/en/diodes-incorporated/2N7002K-7/2N7002K-7DICT-ND/3053305Regards,

author: amyk
author_rank: Super Contributor
timestamp: August 27, 2020, 03:02:27 am
content: According tofamous Russian site, it is either a 2N7002K or a DMN601K, both of which appear to be the exact same thing. My experience with motherboards is that those are common parts on them, and the marking matches both the datasheet andsellers' pictures, so I'd say you found it.

author: jaltagracia
author_rank: Newbie
timestamp: August 28, 2020, 09:01:27 pm
content: I pulled the trigger and bought the parts. I will report if the repair was a success or if I fried my board.
Identify SMD  - Page 1
Forum section: electronics / repair

author: joecho
author_rank: Newbie
timestamp: June 20, 2023, 09:30:48 am
content: I have been unable to find any information or source this IC anywhere. It is on an Asus laptop (FX516PM). Possibly a charging IC?Any help would be appreciated

author: mikerj
author_rank: Super Contributor
timestamp: June 20, 2023, 09:49:04 am
content: Monolithic Power Systems MP2940. It appears to be two phase controller for CPU power management, and it also appears to be a programmable device so just replacing with a new part may not work. The datasheet does not seem to be freely available, the only thing I found was a PDF with an example solution (with a very blurry diagram):https://media.monolithicpower.com/mps_cms_document/m/p/mps_solutions_for_powering_intel_and_amd_socs_22.04.2020.pdf

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 20, 2023, 09:53:09 am
content: Found the same pdf, datasheet seems hiding. In the same document they are showing a programming adapter so yeah...

author: joecho
author_rank: Newbie
timestamp: June 20, 2023, 09:56:23 am
content: Thanks for the information and quick responses. Laptop may be an expensive paperweight now 😮‍💨
Identify SOT-23 "N1ABVR" - Page 1
Forum section: electronics / repair

author: DeepLink
author_rank: Regular Contributor
timestamp: January 27, 2024, 12:59:34 pm
content: I have a part marked very clearly with N1ABVRIt is a SOT-23 device - but whichI tried Goolge, but no helpFirst I thought it was a LM431C, which has a "N1A" marking - but no, not a LM431CAnybody who can help?

author: fzabkar
author_rank: Super Contributor
timestamp: January 27, 2024, 04:16:47 pm
content: Without a photo or any context, this is all I can suggest ...http://markingcodes.com/search/c/N1A
Identify ST chip / Agilent N6700 mainframe powersupply - Page 1
Forum section: electronics / repair

author: ahakman
author_rank: Regular Contributor
timestamp: January 11, 2021, 09:18:43 am
content: Hi. I have a few Agilent N6700 Modular power supplies where the primary power supply (3rd party Cherokee International SP547, 48VDC, >600W) has failed. All of them seem to have failed in a similar fashion with the failure being after the PFC circuit, and on the primary side of the main switcher. Being very high wattage supplies, they seem to have quite a complicated design vs most normal switchmode supplies. All of these have failed in somewhat spectacular fashion (traces vaporized off the board, chips with the top completely blown open, one of the main switcher fets shorted and one of the DC bus capacitors exploded from the resulting short). I'm not having a problem finding shorted parts, resistors with holes in them, etc, but I'd like to reverse engineer the controller circuit a bit to at least slightly understand it and check for less obvious component failures in order to repair them.A problem I've run into is a chip on the daughter board I can't identify. It's clearly an ST part, but I can't seem to find a datasheet for it. On the board from one power supply, it's labeled 339 GZG3349 (I think those are G's, they might be 6's too), and on the board from another power supply, it's labeled 339 eZMY815. I can't find a datasheet for this part with either of these part numbers. The 339 being common between the 2 would seem to mean this is part of the part number, and the rest is factory or date code?? Does anyone know what these are?The board also has a PFC controller ST L4981AD datasheethttps://www.st.com/resource/en/datasheet/l4981.pdf, a UC 3842B Current Mode PWM controller datasheethttps://www.st.com/resource/en/datasheet/uc3842b.pdfif that at all helps.Has anyone repaired any of these power supplies from an N6700 in the past?I'm having to draw out a schematic for parts of this to keep things straight for myself - as I mentioned, these are quite complicated supplies. If I get these figured out and I think the schematic is good enough to help others repair their units, I will post it.

author: CJay
author_rank: Super Contributor
timestamp: January 11, 2021, 09:20:45 am
content: LM339.

author: ahakman
author_rank: Regular Contributor
timestamp: January 11, 2021, 09:26:02 am
content: Yes! They would appear to be that. Not sure how I missed the obvious. I googled "ST 339 datasheet" and it came right up! Now I feel even dumber than trying to reverse engineer this switcher is making me feel!

author: CJay
author_rank: Super Contributor
timestamp: January 11, 2021, 09:56:50 am
content: Quote from: ahakman on January 11, 2021, 09:26:02 amHeh, no worries, we all do it sometimes, real easy to overthink stuff.
Identify thermistor 1.7A / 20% / 82E - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: October 27, 2020, 02:18:37 am
content: I need help to confirm a thermistor. It does not have markings and as per service manual is should a 1.7A / 20% / 82Ethe thing I need help with is the last bit. Is it 82ohms @25ºC?

author: fzabkar
author_rank: Super Contributor
timestamp: October 27, 2020, 02:41:58 am
content: It would appear that you are correct:http://electronicsunlimited.in/EU/images/EUD%205%20-%20Reistance%20to%20Temperature%20charts.pdf

author: gkmaia
author_rank: Frequent Contributor
timestamp: October 27, 2020, 05:24:50 am
content: Awesome!! thanks!!

author: gkmaia
author_rank: Frequent Contributor
timestamp: October 27, 2020, 05:39:10 am
content: Sorry got another question. How do i convert it's power rating?DUT needs 1.7A and the datasheet for the replacement talks about 2.1WAs it sits after the mains rectifiers it will take 220AC*1.41 = 310VDC.But 310VDC at 82OHM will take 1KWatt or 3.7Amps... confusing as it is quite a lot.https://docs.rs-online.com/8e5f/0900766b816e727e.pdf

author: fzabkar
author_rank: Super Contributor
timestamp: October 27, 2020, 06:03:36 am
content: I'm embarrassed to say that I have never thought too much about NTC resistor ratings. However, it would appear that the I2R rating of 2.1W is derived from Imax and Rmin at an ambient temperature of 25C. You can work through the numbers on page 3.For example, for Imax = 6A and Rmin = 0.057 ohm …P = I x I x R = 6 x 6 x 0.057 = 2.05WSimply speaking, because you have an NTC thermistor, its resistance falls substantially due to ohmic self heating. In other words, the rated resistance of 82 ohms only applies when I = 0, ie no self heating.

author: gkmaia
author_rank: Frequent Contributor
timestamp: October 27, 2020, 11:44:58 am
content: Cool, thanks mate. I also found the original datasheet!https://www.casa.co.nz/resistors/nonlinear/Philips-NLR-Data-1977_29x~yp.pdf
Identify this chip TI 2C - Page 1
Forum section: electronics / repair

author: tru3533
author_rank: Regular Contributor
timestamp: August 26, 2019, 11:11:12 pm
content: Hello,I have a controller card with a blown power rail chip on it.On one location it seem to power USB.Marking on chip says TI 2Cpin 1-2 supply inpin 5 gndpin 8 outputDo you know what chip this is?Any help highly appreciated, thank you!Br, Tom

author: narkeleptk
author_rank: Contributor
timestamp: August 27, 2019, 01:08:09 am
content: It seems a bit like this guy tho the pin-out doesn't match the bottom picture.http://www.ti.com/lit/ds/symlink/tps2051c.pdf

author: tru3533
author_rank: Regular Contributor
timestamp: August 27, 2019, 02:08:58 am
content: Too bad, looked promisingI'ts an 8-Pin MSOP-PowerPAD at least

author: fzabkar
author_rank: Super Contributor
timestamp: August 27, 2019, 02:18:27 am
content: The two locations appear to be for two different chips.http://www.ti.com/packaging/docs/partlookup.tspThe bottom line appears to be the part marking.

author: tru3533
author_rank: Regular Contributor
timestamp: August 27, 2019, 02:59:52 am
content: Thank you so much fzabkar! you are absolutely right.TI 2C is manufacturer and dateUSB chip is PXMI as narkeleptk suggestedBlown chip is differentTI 2CPA2?included picture

author: tru3533
author_rank: Regular Contributor
timestamp: August 27, 2019, 03:34:08 am
content: PA2Q ?TPS7A6633QDGNRQ1What do you think?

author: fzabkar
author_rank: Super Contributor
timestamp: August 27, 2019, 04:19:11 am
content: That looks OK to me.
Identify this component.... - Page 1
Forum section: electronics / repair

author: Pete66
author_rank: Regular Contributor
timestamp: December 20, 2019, 02:36:13 am
content: HiI need to identify this part in an ADA preamp. On the schematic it looks like some kind of optoisolator it is circled in yellow. On the PCB it is just a 6 pin DIP with no markings.Thanks

author: WyverntekGameRepairs
author_rank: Regular Contributor
timestamp: December 20, 2019, 02:54:48 am
content: I may be wrong, but it looks like a dual photoresistor-based optoisolator (more recgonizeably called resistive optoisolators) - basically an optoisolator intended for analog signal useage. In theory it would change the resistance of the photoresistors based on the brightness of the LED inside (which would be determined by the input signal voltage level). The resistors' values are measured by the amps, by the looks of the schematic.Also, according to the schematic, U3 is the same chip (or at least a chip with the same function as U5). If that one happens to have a part number, try searching for a datasheet.You should try desoldering and taking a look at the underside of the package. Sometimes, manufacturers put the part numbers on the underside of the chip package (I've seen it quite a few times). If you find a part number, you can look it up and be able to verify my guess.If you can't find a part number under it, try and run a simple test on it to see if it is a dual photoresistor opto. Apply power (1.5-2.5V) to the LED (pins 1 and 2), measuring the resistance between pins 4 and 5, as well as 5 and 6. If you get varying resistances depending on the voltage applied to the LED, then it is indeed an analog optoisolator that uses photoresistor technology instead of phototransistors.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 20, 2019, 03:15:35 am
content: I would say the same thingNever saw double ones ...Maybe something in theses familieshttp://m.szxinlei.com/Product/detail/l/cn/id/11.html

author: David Hess
author_rank: Super Contributor
timestamp: December 20, 2019, 03:25:38 am
content: It looks like a variable resistance optocoupler which uses a pair of photocells and LED to me. Two photocells are used to allow linearization circuits for precision gain control.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 20, 2019, 03:30:02 am
content: Maybe this one or similar, they wrote 1 meg in the schematichttps://www.alliedelec.com/m/d/ecb1ed91959ae54d97cf67f5103d9b2b.pdf

author: WyverntekGameRepairs
author_rank: Regular Contributor
timestamp: December 20, 2019, 03:33:01 am
content: Quote from: David Hess on December 20, 2019, 03:25:38 amSounds about right to me.I suggest running the test anyways just to make sure.

author: Pete66
author_rank: Regular Contributor
timestamp: December 20, 2019, 05:35:27 am
content: Yes I found out that the newer versions of the circuit use this one:https://www.alliedelec.com/m/d/ecb1ed91959ae54d97cf67f5103d9b2b.pdfSo maybe I have an older version. Also there are no markings on the top or bottom of these IC's
identify this diode manufacturer by logo :) - Page 1
Forum section: electronics / repair

author: greeDa
author_rank: Newbie
timestamp: May 16, 2023, 01:54:06 pm
content: Hi,I am new here but I am curious if anyone could help me identify this diode's manufacturer(it was used in a 3phase power supply as input rectifier diode).I know that this diode is available by many other manufacturers but I did some surge tests and this diode was the best so I would like to use the exact same manufacturer.I already checked all semiconductor manufacturer collections I could find but did not find any matches, unfortunately.Hope anyone has a hint for me - many thanks

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 17, 2023, 12:43:46 am
content: https://www.eris.com.tw/

author: greeDa
author_rank: Newbie
timestamp: May 17, 2023, 08:54:55 am
content: wow, thank you very much!
Identify this part 56c11-1TLT - Page 1
Forum section: electronics / repair

author: PhilipJohnBrown
author_rank: Newbie
timestamp: August 25, 2024, 06:02:07 am
content: Hi, can anyone help me identify this part, 48 QFP 56C11-1TLT?Thanks

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 25, 2024, 08:44:26 am
content: philips's custom chip. no document.

author: fzabkar
author_rank: Super Contributor
timestamp: August 25, 2024, 06:05:21 pm
content: It appears to be an Atmel/Microchip part -- AT56C11-1TLT.I see references to AT56C11-1T6T and AT56C11-1TNT. None of these traders appear to know what they are selling. I'm guessing it's a preprogrammed MCU.FWIW, the Rabbit 3000 Microprocessor is an AT56C55-IL1T:https://www.mouser.com/datasheet/2/111/019-0108_W-14549.pdf

author: PhilipJohnBrown
author_rank: Newbie
timestamp: August 27, 2024, 09:55:46 am
content: That's perfects, thanks for your time...
Identify this part - Page 1
Forum section: electronics / repair

author: CJay
author_rank: Super Contributor
timestamp: August 22, 2020, 06:19:18 pm
content: I order one/some.

author: fzabkar
author_rank: Super Contributor
timestamp: August 22, 2020, 06:35:43 pm
content: http://www.smdmark.com/en-US/search/code?id=E8sESD5V3U4RRS, Infineon Technologies, Ultra-Low Capacitance ESD Diode Array, Rail-to-rail diodes with internal TVS diode, marking E8s, SOT-363:https://www.infineon.com/dgdl/Infineon-ESD5V3U4RRS-DS-v01_01-en.pdf?fileId=db3a30431c69a49d011cad6ae0c10a10

author: wraper
author_rank: Unknown
timestamp: August 22, 2020, 06:38:28 pm
content: Seems like quite generic quad ESD protection device. Something similar to IP4220CZ6. There is no need to find exact part, there are more than a hundred of compatible parts. You can desolder it and see if the thing starts working as this part is inactive during normal operation. If it does not work, there is more damage to it.
Identifying a component - Page 1
Forum section: electronics / repair

author: MrPuhur
author_rank: Newbie
timestamp: January 23, 2020, 10:50:09 pm
content: As part of a 40 year old mill's controller board, there's a blown component I couldn't identify. There's a failed (short at the negative side) diode bridge next to it with a smoothing cap and a dead LM309 5V voltage regulator after the diode bridge. The blown unidentified part is across the 5V output of the LM309.Here's 2 high resolution pictures of it. It has "8012" written on it, but I really couldn't get anything sound based on that.https://drive.google.com/file/d/1JkcND16nwQNHQei-VI2HTN4_MBCFFrKo/view?usp=sharinghttps://drive.google.com/file/d/0B_yAWIhEioTZbjhYQjJiZlZ5SVB4QWtoQmRzVEdiMEdUbm00/view?usp=sharing

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 23, 2020, 10:59:47 pm
content: Should be an electrolytic capacitor, the common practice is to place 10μF close to a regulator to avoid it oscillating.8012 would be the date-code, maybe you have a value on the hidden side.

author: fzabkar
author_rank: Super Contributor
timestamp: January 24, 2020, 08:00:54 am
content: Could it be a tantalum capacitor? These had a habit of failing catastrophically.

author: MrPuhur
author_rank: Newbie
timestamp: January 24, 2020, 01:56:33 pm
content: Now that you gave me the idea to search for what old tantalum caps used to look like, I found out that acutally very visually similar ones existed. Thanks.

author: fzabkar
author_rank: Super Contributor
timestamp: January 24, 2020, 08:51:34 pm
content: These look like the ones I used to see in US made gear in the 1980s (possibly by Sprague):
Identifying a DFN 8 buck converter.  - Page 1
Forum section: electronics / repair

author: Fflint
author_rank: Frequent Contributor
timestamp: January 21, 2024, 09:28:21 am
content: I've been trying to identify this dc-dc (likely buck, or buck boost) converter with AMGM317 written on it for a while, but I found nothing else than some guy asking the same question (and getting no answer) on a Russian language forum.I'm attaching his pictures (as they're better and it shows the underside) and a drawing of how it is used (this is exactly the same in my board).This part is on a Chinese made flight controller for an rc plane/quad/car. There are 2 of them one for 5v the other for 9v.If anyone knows the part number, please let me know.I do not understand what the manufacturers gain by obfuscating their parts like this. There is enough space on this chip for 3 rows of 4 characters each. They could've put the actual part number there. Why do I think AMGM317 is not the part number? I searched for it with phrases like dc converter etc (including in Chinese) and I found nothing.

author: DavidAlfa
author_rank: Super Contributor
timestamp: January 21, 2024, 11:28:26 am
content: That line at the top was familiar to me fromMonolithic Power.Quickly checked their catalog and indeed, seems to be aMP9943, marking is AMGY (Y = Year),Datasheet.

author: Fflint
author_rank: Frequent Contributor
timestamp: January 21, 2024, 11:32:00 am
content: Wow, that was quick, thank youI wish there was some sort of database where you could look up a chip by its markings.

author: DavidAlfa
author_rank: Super Contributor
timestamp: January 21, 2024, 11:42:07 am
content: There're are a lot, but chinese ICs are usually not there.Quote from: DavidAlfa on January 18, 2024, 03:43:44 am

author: fzabkar
author_rank: Super Contributor
timestamp: January 22, 2024, 02:48:18 am
content: Another one ...http://markingcodes.com/search/c/amg
Identifying a fuse - Page 1
Forum section: electronics / repair

author: deisenberg
author_rank: Contributor
timestamp: January 27, 2020, 09:54:56 pm
content: I have a PSU from a Sony dvp-cx985v disc changer that I some how popped an on board fuse, two actually. At least I believe they are fuses. Both look the same, see picture. I can't figure out how to identify it for the life of me. It's the green with 1 black strip, item pcb number p502Part number in the schematics is 9-885-024-65 labelled as a link IC - no idea why as it's for the -11v rail.Thanks everyone!Edit: added model of sony disc changer

author: fzabkar
author_rank: Super Contributor
timestamp: January 28, 2020, 12:32:16 am
content: Picofuse?

author: notsob
author_rank: Frequent Contributor
timestamp: January 28, 2020, 02:39:50 am
content: looks like a zero ohm resistor

author: Nusa
author_rank: Super Contributor
timestamp: January 28, 2020, 03:52:35 am
content: I'd agree if the black stripe were in the middle, which it is not. Fuses are essentially zero-ohm resistors until they become open-circuit resistors.P is an unusual prefix for a fuse, however. Looks like there's something on the PCB under the fuse. Perhaps a better look at that might be helpful?

author: floobydust
author_rank: Super Contributor
timestamp: January 28, 2020, 04:07:38 am
content: It would be a Japanese-make part and hard to know who makes it. In North America Littelfuse is the only thing close, and best to use a slo-blo part as many Picofuses are super fast and not ideal where inrush currents happen.It should have colour-coding beyond one stripe so you know what the fuse's value is and don't mix them up in Production. If the other fuses are different value but same markings then I would be puzzled or tend to think it's zero-ohm jumper.

author: goaty
author_rank: Regular Contributor
timestamp: January 28, 2020, 12:58:40 pm
content: 9-885-024-65is described as"Ic Protector 20N1000"https://encompass.com/item/6425943/Sony/9-885-024-65/which from more googling is a 1A Fusehttps://www.manualslib.com/manual/1063274/Sony-Rdr-Gx300.html?page=116Ah, and of course replacing the fuse won´t help as it blew for a reason probably

author: deisenberg
author_rank: Contributor
timestamp: January 28, 2020, 02:06:41 pm
content: Here is the PCB with out the pico fuse. Green fuse above it with a red strip is the other that is dead as well. P301 9-885-036-14 LINK, IC.

author: deisenberg
author_rank: Contributor
timestamp: January 28, 2020, 02:08:08 pm
content: Thanks your google fu is much better then mine!Also the problem was caused by myself, I tried to power an Adriuno mega from the 11v rail and that's when the -11v stopped working. It's possible I shorted it out.edit: For anyone else that has this issueP301 9-885-036-14 LINK, IC is a 20N2000 is a skygate 2a/250 fuse.P501 9-885-024-65 LINK, IC is a 20N1000 is a skygate 1a/250 fuse.I usedhttps://www.jotrin.com/to pull up the details.Thanks everyone for your help!
Identifying an smd part - Page 1
Forum section: electronics / repair

author: simon.jowett
author_rank: Newbie
timestamp: July 04, 2019, 03:21:18 am
content: Hi I'm hoping someone can help me with identifying an SMD part. (see attached image)The part is SOT89 sized and has the markings WH on one line then DKL on the 2nd line.I've searched and the only similar parts I can assign a reasonable level of confidence is a DK part which is a NPN transistor. I can see that this transistor sometimes has a sub code to denote the Hfe characteristics. However I can't seem to find any with DKL or "L" characteristics. The closest part was a 2SC4672-P - am I nearly correct ?!!!Any advice would be much appreciated!

author: denimdragon
author_rank: Regular Contributor
timestamp: July 04, 2019, 03:37:54 am
content: Can you take a pic with the surrounding circuitry? Maybe 1"x1"?Also check this link out if you aren't already familiar with it...http://www.s-manuals.com/smd

author: simon.jowett
author_rank: Newbie
timestamp: July 04, 2019, 03:59:53 am
content: The circuit is in a grid inverter. The areas is right at the input and it's proabably taken a surge on the mains connection (complete guess).The inverter is completely dead so I'm thinking this part of the circuit is the mains sensing and/or the control enabling function.

author: digsys
author_rank: Unknown
timestamp: July 04, 2019, 04:32:37 am
content: That's a tough one. Not on of my SMD books comes close enough. Your best bet is to remove it and trace the pinouts CBE. Verify that theycouldbe an NPN, then try a best guess. Check the pinout against his mate next door as well, or even swap it to the dead location. Hopefully, someone may recognize it, otherwise it'll need a circuit trace.

author: simon.jowett
author_rank: Newbie
timestamp: July 04, 2019, 04:37:39 am
content: Thanks for looking - i'm drawing a blank too. I think I'll remove the good one and see if I can get some info by testing it.

author: fzabkar
author_rank: Super Contributor
timestamp: July 04, 2019, 05:07:28 am
content: Those two parts (WH/DKL and the blown part) are directly driven from the same output of the TL074I quad op-amp. ICBW, but the only time I recall seeing an op-amp driving a transistor directly is when it is configured as the pass transistor in a feedback loop. Otherwise there is usually a series resistor in the base or gate. Even more unusual is that the op-amp is driving both "transistors", which rules out the idea of a pass transistor.

author: denimdragon
author_rank: Regular Contributor
timestamp: July 04, 2019, 05:25:16 am
content: Quote from: fzabkar on July 04, 2019, 05:07:28 amI was thinking PT as well but the jfet op-amp killed that...

author: digsys
author_rank: Unknown
timestamp: July 04, 2019, 06:47:48 am
content: Quote from: fzabkarYep, same conclusions.Option2: Remove the TL074 and the transistors? , take a photo, trace the tracks and work out how the heck it is wired. Then we may get a better picture.

author: simon.jowett
author_rank: Newbie
timestamp: July 05, 2019, 05:09:41 am
content: I'm away for a few days - will remove parts and try figure out a small schematic next week.
Identifying a Xistor - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: April 28, 2020, 02:26:07 pm
content: I suspect it's a FET. Piccie attached. It's totally shorted.

author: aqibi2000
author_rank: Regular Contributor
timestamp: April 28, 2020, 02:38:28 pm
content: FD8880https://www.onsemi.com/products/discretes-drivers/mosfets/fdd8880Test it out of circuit too

author: perdrix
author_rank: Frequent Contributor
timestamp: April 28, 2020, 08:32:06 pm
content: Thank you!Addendum: I removed it and checked out of circuit - definitely short between Drain and Source (both directions). Quite how that happened I don't know given that it's rated at 45A and is protected by a 3A fuse! Yeah, I know - corollary 16 of Murphy's law: When you fit a fuse to protect an expensive device in a circuit, the device will always blow first so as to protect the fuse.PS Mrs. Murphy's Law: Murphy was an optimist.David
Identifying Belt Specs for Cassette Players? - Page 1
Forum section: electronics / repair

author: cmiroc
author_rank: Newbie
timestamp: February 08, 2024, 01:20:22 am
content: Does anyone know either:(1) an extensive resource for finding specs for a replacement belt in a specific audio cassette deviceOR(2) how to find the right belt without resorting to trial and error?I’m specifically looking to repair a General Electric 3-5300B “Compact Cassette Recorder.” Although it seems common, it’s not a deck I can find a matching belt for using my usual sources (webspareparts or fixyouraudio).

author: amyk
author_rank: Super Contributor
timestamp: February 08, 2024, 01:34:14 am
content: Measure circumference with string and subtract a few % for stretch.

author: fzabkar
author_rank: Super Contributor
timestamp: February 08, 2024, 02:22:44 am
content: Cut the old belt in half and measure its length. Take note of the thickness and cross-section.

author: CaptDon
author_rank: Super Contributor
timestamp: February 08, 2024, 04:10:47 am
content: You need to generate the specs then order accordingly. If round belt measure diameter and length. If square belt get dimension of square and length. If flat belt get width, thickness and length. To get accurate length you will destroy the old belt by cutting it and then measuring and then subtracting a certain percentage to compensate for the stretch that occurred over time. The get on a belt website and find the closest match. The place I use sells phonograph parts mainly but has also every belt I ever needed.
Identifying Bluetooth/WiFi cable on Nintendo switch oled - Page 1
Forum section: electronics / repair

author: bozza
author_rank: Contributor
timestamp: March 22, 2022, 12:47:55 pm
content: I am trying to identify a cable which broke to find a suitable replacement.The cable is for an antenna which I assume is for WiFi and Bluetooth. I am looking for a replacement but I have no idea what size it is.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 22, 2022, 01:56:31 pm
content: Have you looked at AliExpress/eBay? Almost for sure the sell these parts.

author: bozza
author_rank: Contributor
timestamp: March 22, 2022, 02:14:54 pm
content: I have. There are plenty of WiFi antennas available for the Switch lite and the LCD switch but not the new OLED switch.The plug does have the letters "IPX" stamped on them but it doesn't reveal much about the size. It could be either IPEX 1, 3 or 4 I guess.
Identifying Bose radio components - Page 1
Forum section: electronics / repair

author: tekky
author_rank: Contributor
timestamp: May 05, 2024, 06:21:03 pm
content: On the AWRCC1 wave radio the larger components have sufficient markings to identify them but there are several sot23-3 parts that remain a mystery.If I can fill out my list I'll post it.Main board 272146-001 parts:marking ;location - pkg, desc---------------------------------------LA1837 ;1 on main bd s1 - 30pin MFP30SD, AMFM tuner preampLC72121M ;1 on main bd s1 - 24pin MFP24S, PLL freq tuner p15=dgnd, p18=vdd 3.6v, p24=xout 7.2mhzHCF4052 ;2 on main bd s2 - 16pin SO16, 4:1 dual analog mux p16=vdd 4-20v, p8=gnd24C01W6 ;1 on main bd s2 - 8pin SO8, I2C memory 1k bitTL072C ;1 on main bd s2 - 8pin SO8, dual amp1V02H ;1 on main bd s1 - 8pin SO8, dual varicap diodesTDA7376B ;1 on main bd s1 - MW15, audio amp P8=gnd, p3,13=vcc, p15=out2, p12=in2C1173Y ;1 on main bd s1 - TO220, power NPN p1=B, p2=C, p3=EA473Y ;1 on main bd s1 - TO220, power PNP "KSH210 ;1 on main bd s1 - D-PAK, power PNP "'K4A (R0)' ;2 on main bd s1 - 6pin sot363, dual npn DMMT3904W'K1N (R8)' ;3 on main bd s1 - 3pin sot23, npn MMBT3904'K3N (R8)' ;1 on main bd s1 - 3pin sot23, pnp MMBT3906'KJE (R9)' ;2 on main bd s1 - 3pin sot23, dual diode BAV99'K72 (R9)' ;2 on main bd s2 - 3pin sot23, N-ch fet 2N7002Unknown:'BDR4N (w/overscore on '4') ;2 on main bd s1 - 3pin sot23, ?'B L.' (w/dot under 'B') ;1 on s1 main bd - 3pin sot23, ?'B _Y.' ;2 on main bd s1 - 3pin sot23, ?'J-4:' (w/dot under 'J') ;1 on main bd s1 - 3pin sot23, ?'B L:' (w/dot under 'B') ;1 on main bd s2 - 3pin sot23, ?'8E429' ;1 on main bd s2 - 4pin sot89, 9vreg? poss KIA78L09F?'8A?EJ' ;1 on main bd s2 - 4pin sot89, 5vreg? poss KIA78L05F?'E3Y' ;1 on main bd s2 - 2pin SOD123 diode on bose link?'B120';1 on main bd s1 - 2pin SMA 1A Schottky rectifier diode B120/B
Identifying Discrete Component - Page 1
Forum section: electronics / repair

author: brokenslinky
author_rank: Newbie
timestamp: September 03, 2025, 07:51:52 pm
content: OK, what is it?The markings on the first line are X25 or X2.5 and a symbol that looks like the Under Armour X. The second line is YDPA. It's the size of 4.7mm in diameter and 2.1mm thick. Lead spacing was very close to 5mm. Very similar dimensions to a ceramic capacitor.Removed from the circuit, it measures 2.2 ohms and "open" for capacitance. I have 10 of these and they all measure the same.In the circuit, it is in series with the positive post of a small 24VDC hobby motor and the 24VDC supply. Across the negative and positive posts of the motor is a 1N4002 diode. The negative side of the motor runs back to the common of the supply. How it's mounted in the circuit doesn't make sense for it to be a ceramic cap. Possibly a fuse? Why would it have resistance though?

author: TimFox
author_rank: Super Contributor
timestamp: September 03, 2025, 08:17:06 pm
content: Fuses have resistance, which increases greatly just before they blow.Low current fuses can have measurable resistance.A 100 mA 3AG fast action fuse has 11.3 ohms cold resistance.I assume your capacitance measurement was parallel-mode?

author: Gyro
author_rank: Super Contributor
timestamp: September 03, 2025, 08:43:34 pm
content: It's a Raychem (TE-Connectivity) Polyswitch PTC thermistor, aka self-resetting fuse.EDIT: You didn't indicate the actual size of the 24V motor or its current draw, but at 2.2R cold resistance I would assume that it is 250mA rated.

author: wraper
author_rank: Unknown
timestamp: September 03, 2025, 08:55:07 pm
content: Littlefuse RXEF025https://www.lcsc.com/product-image/C469011.html

author: brokenslinky
author_rank: Newbie
timestamp: September 03, 2025, 09:01:10 pm
content: Thanks guys! You through me some answers before I could do any further testing on it. I think wraper nailed it. Going to order some from Digikey and see if that does the trick.

author: wraper
author_rank: Unknown
timestamp: September 03, 2025, 09:03:13 pm
content: ^Gyro is right too, Raychem / TE-Connectivity circuit protection business was acquired by Littlefuse a decade ago.

author: Gyro
author_rank: Super Contributor
timestamp: September 03, 2025, 09:08:17 pm
content: I'm a dinosaur, I still have a bunch of original Raychem samples and datasheets from 35+ years ago. I can never keep up with the takeovers.