hybridfree/eevblog-posts huggingface dataset:
Compaq Portable I PSU capacitor replacement [help] - Page 1
Forum section: electronics / repair

author: newtekuser
author_rank: Frequent Contributor
timestamp: February 25, 2022, 06:03:45 am
content: Hello all,I have an old compaq portable I in my possession with a dead power supply, it's is the same power supply that Dave filmed in his video on his YT channel. Visual inspection revealed two blown tantalum 2.2uF 25V caps (C37, C39) close to the comparator circuit, no other caps are bulged but given their age I'm willing to replace them.I took some of the bigger caps out of circuit to test them and found these values with my DER DE-5000 LCR meter:3300uF 6.3V reading 3.3mF 0.0ohm ESR @100Hz freq100uF 250V reading 91.3uF 0.4ohm ESR @100Hz freq470uF 25V reading 470uF 0.03ohm ESR @1KHz freqThe ESR values above are way off any of the ESR charts I was able to find online (guess it has to do with being older tech, maybe my LCR meter is not sensitive enough) and capacitance values look good to me.What's the best approach in this case since ESR is undetermined? Should I be replacing them or wasting my money?I don't understand how a cap can have 0.0ohm ESR, maybe shorted but then how am I reading correct capacitance? Could it be faulty LCR meter?

author: m k
author_rank: Super Contributor
timestamp: March 01, 2022, 04:28:13 pm
content: Low is good.https://www.eevblog.com/forum/beginners/esr-values-for-electrolytic-caps/

author: TimFox
author_rank: Super Contributor
timestamp: March 01, 2022, 06:26:00 pm
content: The "S" in ESR is "series": it is an unwanted (normally) resistance in series with the capacitance of the physical component. Unfortunately, parallel resistance is sometimes called "shunt resistance" that starts with the same letter.

author: TimFox
author_rank: Super Contributor
timestamp: March 02, 2022, 03:50:00 am
content: From the original post: "I took some of the bigger caps out of circuit to test them and found these values with my DER DE-5000 LCR meter:"

author: BrokenYugo
author_rank: Super Contributor
timestamp: March 02, 2022, 04:37:34 am
content: Quote from: newtekuser on February 25, 2022, 06:03:45 am"0.0" can mean 0.099 just as much as it can mean 0.000. An ESR in the tens of milliohms is a sane reading for a cap that big.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 02, 2022, 07:41:32 am
content: Quote from: newtekuser on February 25, 2022, 06:03:45 amCorrectVery likely, as it's uncommon things on component around common markets except few hi-techs ones eg. Proadlizer capsMust ensure with calibrating it

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 03, 2022, 04:32:47 pm
content: I pulled the datasheet for one of the replacement caps I bought from digikey to test my meter and ESR reading is spot on for the 1500uF 25V cap (part no EEU-FK1E152S) rated for 1.8mA ripple current:Datasheet impedance: 0.038ESR meter: 0.03Capacitance reading: 1433uFMeter was calibrated using the internal open/short method.LE: I realize now it said impedance not esr, oh well. Is there a way to obtain the esr value from others in the datasheet?
Compaq Portable Keyboard uses... 12-volts? - Page 1
Forum section: electronics / repair

author: katastic
author_rank: Contributor
timestamp: June 21, 2021, 04:11:19 pm
content: I've got a Compaq Portable. (I) the big suitcase one, also featured on EEVblog, IIRC. I'm looking into adapting this keyboard for normal PC use and I ran into something strange.The keyboard uses (AFAIK) the standard AT keyboard protocol of the original IBM PC. With one caveat. Instead of sending 5-volts over the cable it sends... 12-volts over. At first I thought it was doing some sort of RS-232 or something instead of TTL, but no, after buzzing everything out it simply sends 12-volts from the motherboard/PSU, and then slaps on a 7805 immediately after which regulates to 4.88 volts. As long the incoming voltage is >6.8 volts, it regulates at 4.88v steady, all the way up to 15 volts my bench PSU tops out at.Anyway, the question I have is... does anyone have any idea why someone would 1) go around spec and re-invent the wheel with their own powersupply? The onboard compaq PSU has plenty of 5-volt capacity, and the keyboard consumes maybe 20 milliamps.Noise issues? Keyboard re-use with other models? (I don't think there's any. This is Compaqs first computer, IIRC.) I mean, if the power rail was too suspect to noise, then certainly the communication lines would also.I can easily work around it. It's just odd and I can't come up with a plausible design reason for it.Thanks,--Chris

author: james_s
author_rank: Super Contributor
timestamp: June 21, 2021, 06:30:39 pm
content: I have an old dumb terminal that has a similar approach, I assume they did it to ensure that there is a stable 5V at the end of the thin conductors in the keyboard cable back when the internal logic in the keyboard would draw a significant amount of power.I'm curious why you'd want to adapt the portable keyboard to work on something else though. An original Compaq Portable is a valuable collectible, the keyboard is pretty terrible as I recall from the one I had back in the 90s.

author: Rasz
author_rank: Super Contributor
timestamp: June 22, 2021, 12:01:22 am
content: Everything was overbuild back then. 12V means healthy safety margin.
Comparing cheap signal generators - Page 1
Forum section: electronics / repair

author: MarkMLl
author_rank: Frequent Contributor
timestamp: May 02, 2021, 08:08:05 pm
content: I know that there are multiple threads discussing these, but has there ever been a consensus regarding the relative merits of the JDS6600 (Juntek, frequently rebadged) and the FeelElec FY69000?They seem to be very similar... perhaps a common ancestor? but the Juntek is explicitly supplied with an interface CD and uses a wall wart which implies better isolation, while the FeelElec isn't shown as having a CD but has extra modulation inputs on the back and is explicitly described as having AM modulation.I've got a couple of things coming up which will involve audio repair and sweeping a signal over a tank circuit. And I enjoy having hardware that I can hook onto a PC if necessary.MarkMLl

author: robot.golem
author_rank: Newbie
timestamp: August 26, 2021, 10:26:24 pm
content: I got FeelElec FY6800 60 MHz and generally liked it. However, it stopped working after a few months: Channel 1 is completely out, and channel 2 has positive DC bias and unregulated amplitude. I contacted FeelElec about getting the warranty service (they promise 1-year warranty), but in return they send me a series of emails amounting to what I would call a run-around. Still waiting for them for instructions on how to obtain the warranty service.Anyone has repair manual/schematics for the instrument? -- This could be a very long shot for me, but this is the only option before trashing a fairly expensive device.Also thinking of writing to the Communist Party leaders in these guys' province and city, how their company gives China a bad name in commerce. Maybe that will catch their attention.

author: SpecialK
author_rank: Regular Contributor
timestamp: August 26, 2021, 10:42:20 pm
content: I have a Juntek JDS2800 and it's gnerally decent. However, I've generally outgrown it. At the time I bought it the Juntek PSG9080 and Uni-T UTG-962 weren't on the market. I stongly would suggest you checking Youtube reviews on those two.

author: MarkMLl
author_rank: Frequent Contributor
timestamp: August 28, 2021, 09:51:20 am
content: @robot.golem Noting of course that there are multiple revisions, my notes sayQuote...so I think it's probably fairly important to get the right board version, and there's still the possibility of gross incompatibilities in the FPGA.@SpecialK I ended up getting a JDS6600 since I needed something in a bit of a rush and somebody was quoting a good price (subject to international delivery time, and the seller looking as though they had a one-off that they didn't know anything about). So far it's doing what I needed.I must say that I'm rather taken by the additive encoding used to construct arbitrary waveforms. At some point I'll redo the software for Linux (which will probably also run on Windows, but that's of little interest to me) and will consider enhancing that with a full set of APL-style array operations... not that I'd expect anybody else to notice or to recognise them :-)MarkMLl
compatible eth ports for laptop - Page 1
Forum section: electronics / repair

author: cyberdog
author_rank: Newbie
timestamp: May 18, 2025, 02:52:35 pm
content: Hello,my laptop (Lenovo IdeaPad L340-15IRH Gaming) ethernet port died. Out of warranty. I have good soldering skills and I want to replace the faulty ethernet port. Can you help me with list of HW compatible & size compatible ethernet ports? Motherboard: lnvnb161216USB external ethernet is out of question (low on USB ports).

author: langwadt
author_rank: Super Contributor
timestamp: May 18, 2025, 03:02:56 pm
content: fix both problems in one go,https://amzn.eu/d/j9kYjOF

author: cyberdog
author_rank: Newbie
timestamp: May 18, 2025, 07:47:23 pm
content: This is quite good solution. I love it!Thanks!
Compatible  IT8586E for LENOVO... - Page 1
Forum section: electronics / repair

author: PKTKS
author_rank: Super Contributor
timestamp: June 06, 2021, 11:41:02 am
content: I am sick to see dead shorted IT8586E from LENOVO...There are brand new IT8586E cheaper and widely available.Wondering if anyone succeeded by just reprogramming ECon one of these vanilla ones and worked fine...ThanksPaul
component from 80s unkonwn need help - Page 1
Forum section: electronics / repair

author: Von_Was
author_rank: Newbie
timestamp: October 14, 2024, 02:29:53 pm
content: i have tried to measuring it a littletried to figuring out what it's and i believe its broken , but i don't know what its for sure , but i believe it might be a transformer of sort.i believe 1 side is Primary 1.8k ohm, and the other side might be a broken 2th dary beaus i got noting that i can measure there , but i'm not sure what its , it might be an broken inductor.visual inspection reveals a red dot ,pretty sure its for orientation purpose.its from a battery 6/12 /24v charger by Bimafrom appers to be -86i don't know if i ever seen one of this components before in 20 yearsand i don't know what the 4k stands for ,P.s ignore the solder splash , tho that is equally confusing to me but a really easy fix.thanks in advance //Von_Was

author: edavid
author_rank: Super Contributor
timestamp: October 14, 2024, 02:34:24 pm
content: It looks like a "Vactrol", which is a type of opto-isolator or voltage controlled resistor:https://en.wikipedia.org/wiki/Resistive_opto-isolator

author: coromonadalix
author_rank: Super Contributor
timestamp: October 14, 2024, 02:44:24 pm
content: same tought, seen only once, now twiceoptically controlled resistor .... 4k when lit or 4k at no light, not sure about variable value ??you have a trimpot ...can you do a gross schematic ??

author: schmitt trigger
author_rank: Super Contributor
timestamp: October 14, 2024, 02:54:24 pm
content: Most likely a Vactrol.Unfortunately, it is of the incandescent lamp control variety, the filament could have burned out and that could be the potential reason for an open-circuit resistance measurement (if I understood your post correctly).

author: Von_Was
author_rank: Newbie
timestamp: October 14, 2024, 03:32:17 pm
content: thank you edavid , coromonadalix , schmitt triggeri will read about the Vactrol ,i will do a full mathematics, i don't know how long ti will take , maybe a day or 3 , depending on whats going on , but i will goood enuth i hope , started lerning Ki-cad yesterday , so i hope to be able to simulate it whit Lt Spice , when i figured that one out. i will post results when i have tested the component , in different voltage corresponding to resistance. probebly only a few mesurements , becus maybe 5 just to get somtfing to go on (if it works) else i will tear it apart and see if i can replace the fullty part. and try to capture it on video.

author: TimFox
author_rank: Super Contributor
timestamp: October 14, 2024, 03:50:35 pm
content: Specifically, the Vactrol used a photoresistor, not photodiode/transistor at the output.In 1980, the light was almost certainly incandescent.

author: Von_Was
author_rank: Newbie
timestamp: October 30, 2024, 09:31:23 pm
content: sorry Ben really busy , have approximately gotten time to work on this for maybe 1 hour its apparently the zen-er is dead.have not measured the Vactrol yet , but i will get to it when i get some free time.
Component from BMS circuit - Page 1
Forum section: electronics / repair

author: maxmad
author_rank: Contributor
timestamp: November 29, 2023, 08:17:51 pm
content: Looking for the part inside the red circle.It is from a laptop battery pa06062 BMS circuit with BQ40Z551 controller.Covered with white glue, probably gone while removing the glue.One pin connected to V+ of the battery cells.Other to pin 7 of Q5K FY 095.Probably a battery protection IC with 1K resistors for each cell but can anyone identify this IC?

author: ArdWar
author_rank: Frequent Contributor
timestamp: November 29, 2023, 11:10:28 pm
content: https://www.ablic.com/en/doc/datasheet/battery_protection/S8264A_B_C_E.pdfThe component may be a pull-up, or may be a ptc to detect the two MOSFETs overheating.

author: maxmad
author_rank: Contributor
timestamp: December 01, 2023, 10:15:05 pm
content: It is similar to S8264A but not the same.Pins 5-6 are grounded.I made more measurements and almost find the resistor's sequence.But still the missing component at pin 7 is a mystery till find the exactly same IC.

author: fzabkar
author_rank: Super Contributor
timestamp: December 01, 2023, 11:20:54 pm
content: According to the datasheet, the mystery component is a PTC, or a resistor in the range of 0 to 500 ohms.
Component help - Page 1
Forum section: electronics / repair

author: Mwapy
author_rank: Newbie
timestamp: March 11, 2024, 11:46:55 pm
content: Petsafe underground fence model RF-125.It quit working, found the resistor shown (upper left) is burned, open. No designator, all other are R1, R2, etc. I need to know the value, one red stripe visible, others burned off. I have not found schematics online that show this (there are some that show everything else except SD2 and R?). It's connected to SD2, the the output connector. SD2 is a transistor of some sort (unreadable) with the center leg (collector?) cut and folded back. It maybe is being used as a diode(s). It beeps out as PNP.

author: iskpro
author_rank: Newbie
timestamp: March 15, 2024, 01:21:49 pm
content: I have the same problem.I think my resistor is 5w. There are 3 windings on it. I burned 3 different resistors, hoping to find the resistance value by using the number of windings. But all three had 3 windings. Does anyone have a any idea? How can we find the value of these resistors?

author: RayRay
author_rank: Frequent Contributor
timestamp: March 15, 2024, 04:52:26 pm
content: Quote from: iskpro on March 15, 2024, 01:21:49 pmBasically, there are 3 ways to obtain the value of the resistor:1. Schematics/Service manual of the product (if it can be found)2. Looking at images of an identical board (look up the part number!)3. A reading of the resistor via multimeter (in some cases, burned resistors would still give out the correct reading)If none of the above checks out, then it simply can't be fixed unfortunately.
Component ID - 6 pin DC-DC Stepdown - Page 1
Forum section: electronics / repair

author: 55MV
author_rank: Newbie
timestamp: May 31, 2024, 06:08:31 am
content: Hi!I have a Dahua NVR4116-4KS2/L NVR which runs on 12V. One of the small DC-DC stepdowns got damaged and I need to replace it. I have multiple units so it was quite easy to check another and figure out some of the pinouts. I have included an image here of a good board and it contains the details I have figured out.U14 is the one I need to replace however both in the image are identical, just different resistors I assume to get the different output. Checking various websites with SMD codes, none seem to match what is on these boards - TV6RG.Any help/insight provided will be greatly appreciated!

author: fzabkar
author_rank: Super Contributor
timestamp: May 31, 2024, 08:07:14 am
content: SY8121B, Silergy, High Efficiency Fast Response, Synchronous Step Down Regulator, 2A, 4.5V - 18V Input, 1.2MHz, marking TVxyz, SOT23-6:https://file.elecfans.com/web2/M00/46/61/pYYBAGKUGIyALgTxACvSJxie1eI897.pdfhttps://images.tuyacn.com/smart/demo_printer/SY8121BABC.pdf

author: 55MV
author_rank: Newbie
timestamp: May 31, 2024, 08:41:09 am
content: Quote from: fzabkar on May 31, 2024, 08:07:14 amMany many thanks! This looks like it. One thing I should do is stick the scope on one of the working units and determine the switching frequency and see if it matches up. Would the 3.3v on pin4 have just been the high signal to keep the chip in the on state? In theory I should be able to measure the output voltage on the LH side of the inductor. I will order a couple of these SY8121B and ill be sure to post an update once installed.

author: fzabkar
author_rank: Super Contributor
timestamp: June 02, 2024, 01:31:02 am
content: Quote from: 55MV on May 31, 2024, 08:41:09 amYes, that's what it does.

author: 55MV
author_rank: Newbie
timestamp: June 16, 2024, 06:30:37 am
content: Quote from: fzabkar on June 02, 2024, 01:31:02 amAwesome. I found this chip actually supplies a 1.5V rail on the output inductor. The replacement chips were indeed the same and worked great. Thankyou again.
Component identification  - Page 1
Forum section: electronics / repair

author: Liteace
author_rank: Regular Contributor
timestamp: May 08, 2020, 09:59:08 pm
content: Need some help please, I plugged the wrong charger in my portable oscilloscope, 16 volts instead of 12 volts, I got a little bit of smoke and that Ive popped something smell, the unit still works but wont switch off, the 2 pics here, one of the popped chip and one of another chip with the same logo but more pins/legs, on the popped chip the pin the red arrow is pointing at is connected to the positive center pin of the 12v charging socket . I want to try and replace that chip to repair the unit if any of you guys could ID it or even from the logo id the manufacturer of the chips

author: Manul
author_rank: Super Contributor
timestamp: May 08, 2020, 10:15:33 pm
content: That should be LTC4416.

author: Liteace
author_rank: Regular Contributor
timestamp: May 08, 2020, 10:43:48 pm
content: wow that was quick,Thank you
Component identification - 431k LT JH - Page 1
Forum section: electronics / repair

author: hjwise
author_rank: Newbie
timestamp: June 10, 2020, 05:23:30 pm
content: Hi, I’m trying to identify a burnt out component in my cooker controller. It’s marks are 431k LT JH. Made by VDE (I think).I’m assuming it’s a varistor but I can’t find anything on the web to be able to purchase one.Any help would be greatly appreciated.

author: bob91343
author_rank: Super Contributor
timestamp: June 10, 2020, 06:06:33 pm
content: Picture? Brand name and model number?

author: wraper
author_rank: Unknown
timestamp: June 10, 2020, 06:09:35 pm
content: Should be 275V AC (430V DC) varistor. Replace it with one of the same diameter or larger if it fits.QuoteNo it isn't, VDE is safety certification mark. If you want precise model or actual manufacturer, post a photo.

author: hjwise
author_rank: Newbie
timestamp: June 10, 2020, 06:11:17 pm
content: Looks like image attached. Can’t see a model number.Thanks

author: hjwise
author_rank: Newbie
timestamp: June 10, 2020, 06:47:00 pm
content: Photo of side attached (detached from legs)

author: wraper
author_rank: Unknown
timestamp: June 10, 2020, 07:36:53 pm
content: It's Raychem which was acquired by TE 20 years ago and TE likely continued to use that logo. Should be ROV07-431K which has 7mm diameter, or replace "07" with actual diameter in mm (05, 07, 10, 14, 20) if it's different. LTJH is simply a lot code.

author: hjwise
author_rank: Newbie
timestamp: June 10, 2020, 07:44:23 pm
content: Brilliant. Thanks for your help.
Component Identification - Page 1
Forum section: electronics / repair

author: marc.hickling
author_rank: Contributor
timestamp: June 02, 2021, 02:36:27 pm
content: Hey all anyone have any idea what this IC is?thanks

author: tszaboo
author_rank: Super Contributor
timestamp: June 02, 2021, 02:50:49 pm
content: No. It would help if you would tell us what product it's in and a picture of the board, showing more components.

author: ZedaPeida
author_rank: Newbie
timestamp: June 02, 2021, 07:58:56 pm
content: My guess would be a 74LVC2G14GV Schmitt trigger. At least the marking code is the same.

author: marc.hickling
author_rank: Contributor
timestamp: June 04, 2021, 02:03:30 am
content: thanks Both. appreciate it!
Component identification - Page 1
Forum section: electronics / repair

author: eduaqa
author_rank: Contributor
timestamp: June 05, 2022, 11:36:47 pm
content: I have a FAN controller (home decorators) which control a 3 phase variable speed motor and the dim lightBut the important is:There is a sto23-5 that supposed provide power for the MCU and remote control receiver portion, but on the 5v point test i only have 5v peek on 60hz but just 10 percent duty, so the MCU don’t have power to runThis sto23-5 receive 170vdc (rectified from 120vac), it has a few capacitor, resistor e diode aroundOn the bottom it has C278 noted and on the top it has IAFAK notedAny idea what is that?

author: fzabkar
author_rank: Super Contributor
timestamp: June 06, 2022, 02:04:56 am
content: MP156GJ, Monolithic Power, Small, Energy-Efficient, Off-line Regulator, 30mW No-Load Power Consumption, marking AFA, TSOT23-5:https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP156/The "I" is actually a vertical line which is a characteristic of most Monolithic Power ICs.

author: eduaqa
author_rank: Contributor
timestamp: September 05, 2022, 06:27:05 pm
content: Thanks fazbkar, you are right. Now next question would be, any idea where I can buy it? I checked digikey and mouser but the restock will be in 1 year. Any idea where to buy? Or if there are a replacement? I just need 1 (or couple for spare) to fix my fan that use DC Motor.

author: fzabkar
author_rank: Super Contributor
timestamp: September 05, 2022, 06:46:43 pm
content: I tried Farnell and RS-Online, but no luck. :-(

author: nanodocl
author_rank: Contributor
timestamp: September 09, 2022, 11:05:06 am
content: Not the best place to buy an electronic component, but it may work for youhttps://es.aliexpress.com/item/1005004626218392.html?spm=a2g0o.productlist.0.0.727a7ba8xpe4g6&algo_pvid=76e3ccb5-0c14-4c99-a806-3ee4bff986f3&algo_exp_id=76e3ccb5-0c14-4c99-a806-3ee4bff986f3-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000029883050284%22%7D&pdp_npi=2%40dis%21EUR%2115.39%2115.39%21%21%215.18%21%21%402103255b16627213900397775e0ede%2112000029883050284%21sea&curPageLogUid=dVmEGpvGUJBl
Component Identification - Page 1
Forum section: electronics / repair

author: Starfish190e
author_rank: Newbie
timestamp: July 14, 2022, 07:54:56 pm
content: Hi there! this may not be the right place to ask but I have an SMD component that I need identifying that looks like an SMD diode with the code SM4B across the top. Does anyone have any idea where to get one from because from my research today I cannot find a matching component.The bonus is only one of the four I have on a small PCB I'm trying to repair has popped so if needed I can test the other three to find an equivalent component.The kicker ... I have no schematics of the PCB in question yet and even then I doubt I will get a response from the company who manufactured the board.Any help is welcome guys and thanks in advance.

author: wraper
author_rank: Unknown
timestamp: July 14, 2022, 08:01:08 pm
content: Photo would be helpful.

author: golden_labels
author_rank: Super Contributor
timestamp: July 14, 2022, 10:45:21 pm
content: Other valuable information that aids identification:What device it is? Type, manufacturer, model.Showing surroundings of the component.Giving an overall view of the board with the component location marked.While markings provide some candidates, the final confirmation may only be obtained by seeing if the placement of the component makes sense.

author: asis
author_rank: Frequent Contributor
timestamp: July 15, 2022, 03:04:43 am
content: Hi,Look at herehttps://datasheetspdf.com/datasheet/search.php?sWord=B160W

author: Starfish190e
author_rank: Newbie
timestamp: July 15, 2022, 07:24:43 am
content: The device is a Cloud CXV-425 100V Line Amplifier, I'll attach more photos once I've cleared my bench.

author: wraper
author_rank: Unknown
timestamp: July 15, 2022, 09:48:42 am
content: S1M diode, manufactured by General semiconductor.https://www.vishay.com/docs/88711/s1.pdf
Component Identification - Page 1
Forum section: electronics / repair

author: mariusmul
author_rank: Newbie
timestamp: December 21, 2022, 12:20:05 pm
content: Any help with this component please.Ignore the artwork its bad.It seems to be a Diode or TVS .It is used in a circuitWith a 36B65 chip (picture typical not the actual circuit)).I tried a schottky with no luck it fries the chip. Thank you.

author: wraper
author_rank: Unknown
timestamp: December 21, 2022, 12:25:30 pm
content: S10M diode.

author: wasedadoc
author_rank: Super Contributor
timestamp: December 21, 2022, 01:01:25 pm
content: If the chip is getting fried it is likely the MOSFET is fried before that.

author: wraper
author_rank: Unknown
timestamp: December 21, 2022, 03:47:09 pm
content: There is no chance schottky will work there, voltage is an order of magnitude too high.
Component Identification - Page 1
Forum section: electronics / repair

author: Bones558
author_rank: Contributor
timestamp: August 27, 2023, 03:29:19 am
content: Hello,Could someone please help specifically identify these components?I believe they are resistors, but I am unsure of the exact specs.Thanks!(Pictures are of the same components, just taken from different angles.)

author: Psi
author_rank: Super Contributor
timestamp: August 27, 2023, 04:09:06 am
content: 01C = 10kΩ (E96 coding system)330 = 33 ohms (normal resistor system)

author: Bones558
author_rank: Contributor
timestamp: August 27, 2023, 06:18:55 pm
content: Thanks for that info.Which from these Newark lists would be equivalent replacements?33Ω:https://www.newark.com/w/c/passive-components/resistors-fixed-value/chip-smd-resistors?resistance=33ohm&product-length=1mm&packaging=cuttape&range=inc-in-stock&sort=P_PRICE10kΩ:https://www.newark.com/w/c/passive-components/resistors-fixed-value/chip-smd-resistors?resistance=10kohm&product-length=1mm&packaging=cuttape&range=inc-in-stock&sort=P_PRICEThanks.

author: wraper
author_rank: Unknown
timestamp: August 27, 2023, 06:46:08 pm
content: Any of proper geometrical size will work. You can chose 1% tolerance just to be sure if it's a circuit where precision may be important. Size is 0603 or larger as smaller sizes do not have marking, however we have no way to tell exact size from the photos. So you need to measure dimensions or compare the size with some known part.

author: wraper
author_rank: Unknown
timestamp: August 27, 2023, 06:50:56 pm
content: Also it looks like circuit have some liquid damage, however I'm more concerned about corrosion of vias rather than about these resistors.

author: Bones558
author_rank: Contributor
timestamp: August 28, 2023, 03:33:21 am
content: I've measured them with a small tape measure, length appears to be 1mm, width 0.5mm.That seems to equate to 0402 size.The board in the pictures isn't what I'm fixing.I'm fixing another of the same board that accidentally got a few surface components knocked off.Any brands better than others? (I ask cause when I buy capacitors, I limit the search to specific brands only with high reputations.)Thanks.
Component identification - Page 1
Forum section: electronics / repair

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 12, 2024, 02:38:17 am
content: I tried to google the chip number but no luck, of course I haven’t a clue what it is try and find it. Thanks Michael

author: FactorySmoke
author_rank: Newbie
timestamp: January 12, 2024, 02:45:10 am
content: Measure the exact dimensions of the plastic part. That will help narrow down what it is.Looks like it could be a SOT23-6 package.Is it a LED driver?Also, post a picture with surrounding components.

author: Martian Tech
author_rank: Regular Contributor
timestamp: January 12, 2024, 02:55:12 am
content: 6-piin package: I guess optocoupler, with the transistor at the melted end. But yeah, without any other context (what is it in?), it's really hard to tell.

author: DavidAlfa
author_rank: Super Contributor
timestamp: January 12, 2024, 03:25:31 am
content: https://www.lcsc.com/product-detail/LED-Drivers_Richtek-Tech-RT9284A-20GJ6E_C250540.html

author: fzabkar
author_rank: Super Contributor
timestamp: January 12, 2024, 03:27:13 am
content: "AW=" is probably a Richtek part.http://markingcodes.com/search/c/aw=RT9284A-20GJ6E, Richtek, Tiny Package, High Performance, Constant Current Switching Regulator for White LED. marking AW=, SOT23-6:

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 12, 2024, 04:25:35 am
content: It’s a Autel 906 automotive scanner.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 12, 2024, 04:39:58 am
content: I cleaned it off some more and not sure it’s blown, it did have some black stuff running from it to the 100 chip beside it and it could be melted on the bottom. The 100 chip does get hot.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 16, 2024, 02:15:43 am
content: Can anybody tell me what the component labeled 100 is in second picture. This is what I think the one AW chip is.https://www.vishay.com/docs/68393/si3438dv.pdfThanks

author: coromonadalix
author_rank: Super Contributor
timestamp: January 16, 2024, 02:25:52 am
content: i would say an inductorand the Richtek Tech RT9284A-20GJ6E seems a good candidate, check the pinout vs the pcb and surrounding partsfor the chip i've seen smps controller in these packagesif the coil get hot it means you have some short on the supply line or a bigger current consumptionnot being rude, but the pcb is messy / greasy etc ... did you try to unsolder things

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 16, 2024, 04:13:01 am
content: Yeah just flux from removing a 40 pin connector.
Component Identification - Page 1
Forum section: electronics / repair

author: Poroit
author_rank: Frequent Contributor
timestamp: June 19, 2024, 10:03:30 am
content: G'day All,Can anyone identify the two components shown in the attached.They are on a Powerland Battery Charger Control Board

author: DavidAlfa
author_rank: Super Contributor
timestamp: June 19, 2024, 11:48:22 am
content: LM293 and MC9S08PA4AVTG?

author: Poroit
author_rank: Frequent Contributor
timestamp: June 24, 2024, 06:56:23 am
content: Thank you David,I confirmed with NXD that the device is MC9S08PA4.

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 24, 2024, 07:07:47 am
content: S08 are microcontrollers, are you trying to reverse engineer?It might be a bit tricky to replace if you just want to repair a broken one.
Component identification: BNC140 4520, TO126 package - Page 1
Forum section: electronics / repair

author: ElektroQuark
author_rank: Unknown
timestamp: August 02, 2020, 08:48:40 am
content: It's from a PHILIPS 8W LED tube (model number 9290013072A).Pins 1 and 3 are shorted.

author: ElektroQuark
author_rank: Unknown
timestamp: August 02, 2020, 12:44:13 pm
content: OK It looks like it is a 3DD4520 A6:DATASHEETAny advice of what could be an easy to find replacement?

author: Audiorepair
author_rank: Frequent Contributor
timestamp: August 02, 2020, 01:11:03 pm
content: http://www.farnell.com/datasheets/1915437.pdf?_ga=2.148024831.918711049.1596311256-1771980843.1483642398

author: ElektroQuark
author_rank: Unknown
timestamp: August 02, 2020, 07:48:02 pm
content: Thank you!
Component identification, can anybody help? - Page 1
Forum section: electronics / repair

author: Perrin21
author_rank: Regular Contributor
timestamp: October 07, 2019, 12:04:02 pm
content: Hi, i am trying to identify this transistor and find a link to the documentation and its replacement. I am struggling to get an exact match. Can anybody help? its inside an EV charger i am trying to repair.Thanks

author: PKTKS
author_rank: Super Contributor
timestamp: October 07, 2019, 01:54:09 pm
content: This one i think is luckyhttps://in.rsdelivers.com/product/on-semiconductor/ntd3055l170t4g/ntd3055l170t4g-n-channel-mosfet-9-a-60-v-3-pin/1632297Mostly I have frustrating results on that crappy SMD codeshttps://www.datasheetarchive.com/pdf/download.php?id=d44cb24a0cee927f136acea3734b39834e79ac&type=M&term=NTD3055L170T4G(edited a wrong pasted ref. hope this one fits)Paul

author: LateLesley
author_rank: Frequent Contributor
timestamp: October 07, 2019, 01:57:23 pm
content: Could it be a Triac??https://media.digikey.com/pdf/Data%20Sheets/ON%20Semiconductor%20PDFs/MAC4DCM_CN.pdf

author: Perrin21
author_rank: Regular Contributor
timestamp: October 07, 2019, 10:25:30 pm
content: Quote from: LateLesley on October 07, 2019, 01:57:23 pmfantastic, i think you nailed it with the Triac. Thanks for your help.
Component Identification for 3D Printer Repair - Page 1
Forum section: electronics / repair

author: Matters1234
author_rank: Newbie
timestamp: October 03, 2019, 04:44:27 pm
content: Hi,I am working on a faulty 3D Systems Projet 3510HD 3D printer (I understand that this is pretty common for a 3D systems machine), the software is auto shutting down due to a 'jetstack 2 overtemp' issue.The temperature reading from the software during a cold startup is 90C on jetstack 2 and 20C (room temp) for jetstack 1. From this I assume that the issue is the jetstack 2 temperature sensor in the print head.I have disassembled the printer expecting to find a thermocouple or something in the printhead. It wouldn't be that easy. I have found what I think is the thermo-sensor and 3D systems do not make their technical documentation public so I cant even look it up.I have added some images:1.jpg - the printhead assembly2.jpg, 3.jpg, 4.jpg - the component I think is the thermo sensorI'm happy to do the research to find the specific part type, I just have no idea what it is or what its called.If anyone has any ideas I would be very grateful,Thank you!

author: fzabkar
author_rank: Super Contributor
timestamp: October 03, 2019, 10:19:32 pm
content: I haven't the first idea how 3D printers work, but the fact that the sensor has a transparent cone would suggest that it may be an IR temperature sensor. Does this make sense?ISTM that two of the wires must be the supply (can you measure the voltage?), while the third must be the temperature output. If you can set up an external supply, then perhaps you could heat the sensor with a hair dryer, or aim it at a heat source.

author: Matters1234
author_rank: Newbie
timestamp: October 04, 2019, 03:45:35 pm
content: Thanks for the reply fzabkar, that does make sense. Through some googling of IR temperature sensors I found an image of a similar looking device that turned out to be a IR fluid level sensor. So unfortunately this is not what needs replacing.With a little more research into the print head board I found that it is an OEM xerox print head and the temp sensor is within the jetstack structure (looks like I will have to buy a complete print head replacement)Thanks anyway.
Component identification from SansAmp Bass Driver DI - Page 1
Forum section: electronics / repair

author: MRiddickW
author_rank: Contributor
timestamp: October 23, 2020, 11:52:44 pm
content: Hi all,Does anyone have any idea what this component might be? It's from aTech21 SansAmp Bass Driver D.I. (gen 1). No markings other than "CH34-4" and pin 1 indicator. Same on the other side. SIP-8 package. My first thought was a SIP resistor array, but that makes no sense once I think about it more. That said, here's the resistances referenced to pin 1.Pin 2: 15.2 MOhmPin 3: OLPin 4: 217 kOhmPin 5: 310 kOhmPin 6: 440 kOhmPin 7: 660 kOhmPin 8: OLI measured these before I realized how ridiculous it would be for it to be a resistor array; why not make the resistors surface mount like all the others? Also that would be about 6 times the size of any other resistor array I’ve seen.I've sketched out a few of the connections. I'm making it into a readable schematic that I'll add when I'm done, but I figured I'd get this out now in case someone immediately recognizes it.Thanks!

author: amyk
author_rank: Super Contributor
timestamp: October 24, 2020, 12:30:32 am
content: The summary is that it's just the manufacturer trying to hide parts of the circuitry from reverse-engineering... which didn't work, because I found some very useful information in here:https://www.freestompboxes.org/viewtopic.php?f=1&t=6571&start=80Whole thread is interesting too. Sadly a lot of the links and pictures are dead, and the archive.org does not have them either, but you can get most of the info from there.

author: MRiddickW
author_rank: Contributor
timestamp: October 24, 2020, 12:59:35 am
content: 22 pages! Well I guess I have my reading cut out for me; thanks!There are a lot of things more depressing than old, broken forum threads, but it's definitely a unique feeling of hopelessness.

author: MRiddickW
author_rank: Contributor
timestamp: November 01, 2020, 03:20:28 pm
content: So I don't turn into the thing I hate the most, here's an update: Thanks to you and the thread you linked, I managed to find a few schematics that use the module. Attached is a screenshot of the module portion of the schematic.
Component identification help! Additional information! - Page 1
Forum section: electronics / repair

author: TOTALCHIPS
author_rank: Newbie
timestamp: April 28, 2022, 01:22:08 pm
content: Hi I'm doing a repair and I found a bad component (Blown component). However I have not been able to identify this 4 terminal component yet. So, help will be highly appreciated. Additional information. Package is 2.04mmX1.32X0.95mm. In an attempt to know what I have, I have exposed the die and die markings.

author: fzabkar
author_rank: Super Contributor
timestamp: April 28, 2022, 07:41:51 pm
content: It looks like Microchip's logo, but I expect you already knew that.Could we see the PCB so that we can get an idea of the context?

author: TOTALCHIPS
author_rank: Newbie
timestamp: April 29, 2022, 06:26:31 pm
content: Thank you very much for you feedback, it really looks like a Microchip logo. However maybe this part was something different since die marking has no microchip logo. Maybe was a Micrel part acquired by Microchip. I have attached 2 more photos a PCB and a close up area. The device is an Arterial pressure monitor and there was a pair of burn components. These drive the air pump. Still not sure what specifically what they are. I thought initially that these may be Mosfets or transistors, but by the die they are something little more complex. Please advise on your thoughts. The lines red have short and the blue lines have short as well.

author: fzabkar
author_rank: Super Contributor
timestamp: April 29, 2022, 07:21:37 pm
content: Could it be an "intelligent" high-side load switch???Something like this ...https://ww1.microchip.com/downloads/en/DeviceDoc/mic94060.pdfOther devices ...https://www.microchip.com/en-us/parametric-search.html/149By "intelligent", I mean a device that has medical grade protections built in, not something that has an i2c bus, etc.Edit:Attached is my guess at the pinout. I suspect that the Vin and Enable pins are connected by a pullup resistor rather than a direct short. I also suspect that Vout is connected to ground via the low impedance of the pump and air valve.
Component identification help  - Page 1
Forum section: electronics / repair

author: matt09
author_rank: Regular Contributor
timestamp: April 28, 2022, 08:59:37 pm
content: Is anyone able to help identify these components, I've had a look around but not managed to find anything.The IC is PWM waveform generator and diode likely some high voltage rectifier.Thanks

author: fzabkar
author_rank: Super Contributor
timestamp: April 28, 2022, 09:23:09 pm
content: http://www.smdmark.com/en-US/search/code?id=es1jES1J, Paceleader Industrial, 1.0A, 600V, Surface Mount Super Fast Recovery Rectifier, DO-214AC:http://www.paceleader.tw/WebFiles/ES1A%20THRU%20ES1J.pdfhttps://pdf1.alldatasheet.com/datasheet-pdf/view/984003/PACELEADER/ES1J.html

author: matt09
author_rank: Regular Contributor
timestamp: April 29, 2022, 10:34:48 am
content: Cheers, I thought I'd checked on there but must have missed it.Still struggling on the IC.

author: fzabkar
author_rank: Super Contributor
timestamp: April 29, 2022, 05:15:31 pm
content: It might help if we could see the IC in the context of its surroundings. That could help us to identify the date codes and a possible manufacturer.

author: matt09
author_rank: Regular Contributor
timestamp: April 30, 2022, 09:53:42 pm
content: I'm not too sure it would be useful as it's just a PWM generator chip which feeds a FAN7384 Half Bridge gate drive IC. There are no other active components for this circuit except the FETs, unless you think other circuits on the board might be helpful?

author: fzabkar
author_rank: Super Contributor
timestamp: April 30, 2022, 10:42:41 pm
content: Could it be a preprogrammed 8-pin microcontroller?Something like a PIC12F629/675?https://ww1.microchip.com/downloads/en/devicedoc/41190c.pdfWhich pins are Vcc and Ground? Which pins connect to HIN and LIN of the gate driver?
Component identification help needed - Page 1
Forum section: electronics / repair

author: h3ndr1k
author_rank: Newbie
timestamp: August 13, 2021, 12:45:04 pm
content: Hi All!I am reverse enginering a pcb from a Pet Porte 100-1023 rev 000. After a lot of hours i heve the schematics almost complete. I'm pretty sure that eny electrical engineer would want to step his eyeballs out after seeing it but it seems to be right.I am left with two components that i cannot id.- The first one is an transistor looking package with the text HJYQ, it's labeled U4. My current assumption is that it's job is getting the voltage down to 5 v- The second one is also transistor looking but incredible tiny. My best quess at the text is  G, it's labeled Q5Is there any one that would know how to identify these components?If anyone would like to check the schematic and check it i would be happy to share, just let me know.

author: amyk
author_rank: Super Contributor
timestamp: August 13, 2021, 01:40:52 pm
content: HJxx is24AA014The second one looks like 1G (wipe it a little to clean some flux residue off the first character) which is probably a BC847C.

author: h3ndr1k
author_rank: Newbie
timestamp: August 13, 2021, 01:53:23 pm
content: Hi Amyk,I do agree on the BC847C, That looks like it fits.The other link you've sent is the wrong package though... Just to be clear i'm talking about the component in red.

author: narkeleptk
author_rank: Contributor
timestamp: August 13, 2021, 02:09:43 pm
content: How does the sot23-3 measure on pins? You mention 5v, did you measure that?I suspect HJ is the id and the YQ is just production date.

author: h3ndr1k
author_rank: Newbie
timestamp: August 13, 2021, 02:20:50 pm
content: Measured the 5v at the right lower pin

author: fzabkar
author_rank: Super Contributor
timestamp: August 13, 2021, 06:13:01 pm
content: U4 looks like an LDO regulator. The centre pin appears to be ground while the other two are probably Vin and Vout.Edit:This part seems to fit, but the pinout looks wrong:MCP1702, Microchip, 250 mA Low Quiescent Current LDO Regulator, 5V, marking HJnn, SOT-23A:https://ww1.microchip.com/downloads/en/DeviceDoc/22008E.pdf

author: h3ndr1k
author_rank: Newbie
timestamp: August 13, 2021, 06:40:16 pm
content: I will check tomorrow. Maybe it could be right!The chunky trace you see at the top is the supply voltage, which go's to pin 3 (vin) if pin 1 goes to ground you might be right! Thank you so much in advance! I learned a lot today.
Component Identification - PJ1499 LZ - Page 1
Forum section: electronics / repair

author: killingtime
author_rank: Regular Contributor
timestamp: March 22, 2023, 10:24:01 pm
content: Hi,Anyone know what this component is:https://i.ibb.co/DprLPHY/Untitled.jpgCan't find any info on the marking. It came from a switch mode supply and was connected across the supply rails just before the mosfet switch (it's not the rectifier diode after the mosfet - that was much bigger).It was letting the magic smoke out. Guessing it's either a diode or tantalum cap. Measures 3 ohms in both directions. The PSU works fine without it.One other thing. All the schottky diodes in a bridge rectifier config had a forward Vf of 0.2v and a reverse Vf of 0.7v (in circuit). They were all fine. Shouldn't they be open circuit in reverse?Thanks.

author: fzabkar
author_rank: Super Contributor
timestamp: March 22, 2023, 10:59:53 pm
content: I suspect it's a unidirectional TVS diode.http://www.smdmark.com/en-US/search/code?id=lz

author: Kim Christensen
author_rank: Super Contributor
timestamp: March 22, 2023, 11:28:30 pm
content: Quote from: killingtime on March 22, 2023, 10:24:01 pmThat's the problem with measuring things in circuit. Other components are in series/parallel with them. Take those readings with a grain of salt.

author: killingtime
author_rank: Regular Contributor
timestamp: March 25, 2023, 12:34:37 pm
content: Found a website that says it could be a schottky diode. Equiv: PJ942K MB510https://www.yoycart.com/Product/551538695332/

author: fzabkar
author_rank: Super Contributor
timestamp: March 25, 2023, 03:38:56 pm
content: Quote from: killingtime on March 25, 2023, 12:34:37 pmThat's an MB510 diode:https://www.panjit.com.tw/upload/datasheet/MB510-AU.pdf"PJ" is Panjit International. "1499" must be some kind of date and batch code. "LZ" is the part ID.PJSD24TS, Panjit, TVS diode, 120W, 24V, marking LZ, SOD-523:https://www.panjit.com.tw/en/Product/downloadPDF/PJSD24TSttps://datasheet.lcsc.com/lcsc/1811021612_PANJIT-International-PJSD36TS-R1-00001_C304458.pdf
Component Identification SMD 5C62 - Page 1
Forum section: electronics / repair

author: redor
author_rank: Newbie
timestamp: August 28, 2023, 12:01:21 am
content: Hello,I'm trying to repair a Panasonic Lumix GX9 and I have identified a faulty Transistor. Unfortunately it is only marked 5C 62 or (SC 52?). It is used to switch the 1.8V Rail for the RAM. Pinout is: 1: GND, 2: CE, 3: VIN, 4: VOUT. VIN is connected to a 1.8V Rail and CE is controlled directly via the 'global' on switch. The Package is some weird 4Pin BGA Package. Attached is a picture I took through my microscope. Can anybody help to identify the component or help me to identify a suitable replacement? I have the complete schematics at hand, but in there are only panasonic specific part numbers for transistors and I'm to dumb to figure it out myself.

author: fzabkar
author_rank: Super Contributor
timestamp: August 28, 2023, 04:34:26 am
content: It appears to be a high-side load switch.R5540K004B, Ricoh, N-channel Load Switch IC, 0.8V - 3.6Vin, 450mA, marking 5C+xx, DFN(PLP)1010-4F:https://www.mouser.com/datasheet/2/792/r5540k-e-843985.pdfhttp://markingcodes.com/search/c/5c

author: redor
author_rank: Newbie
timestamp: August 29, 2023, 11:25:07 pm
content: Thanks a lot!I‘ve ordered the component and it will arrive on Thursday. I really hope it will bring the camera back to life. I love that thing!
Component Identification WSON 10pin - Page 1
Forum section: electronics / repair

author: mustafakerb
author_rank: Contributor
timestamp: June 29, 2023, 08:37:44 am
content: This little bugger does not show on any usual places with datasheets. My best guess - TI dc/dc? Any help appreciated. thanks.

author: fzabkar
author_rank: Super Contributor
timestamp: June 29, 2023, 09:48:39 am
content: It doesn't show up in TI's database.https://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=f305https://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=e1l7Here it is:8-bit Microcontrollers - MCU 2kB/256B RAM, QFN11 OTP available (T605-GM) - Silicon Labs:https://au.mouser.com/datasheet/2/368/C8051F30x-45329.pdfhttps://www.partsdirect.ru/goods/423429(includes photo of C8051F305-GMR)https://v2.partsdirect.ru/goods/good_big_pics/423429.jpg

author: mustafakerb
author_rank: Contributor
timestamp: June 29, 2023, 01:38:28 pm
content: MANY thanks! Looks like I have to upgrade my google-fu.