hybridfree/eevblog-posts huggingface dataset:
Help me identify this connector for Furuno Radio - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: July 19, 2022, 06:47:58 am
content: Hi,I am seeking for the headset/mic connector for furuno radio. Glancing thru the service manual I found the part number is: FM10PS-6H, I dropped an email to furuno and the provided a part number and they actually asked me to contact my loacal distributor for purchase, sadly they are not responding. So now I am trying to figure out the OEM for the connector. Attached is the picture for the connector and the mating radio end. Hope someone can help identify it.Remarks: My initial guess, it might be Hirose HR10-7P-6P(73), but the groove mating is opposite and hirose is push pull type

author: Gribo
author_rank: Frequent Contributor
timestamp: July 19, 2022, 06:14:13 pm
content: It looks like a shell size 10 circular threaded connector, but I might be wrong. Measure the outer and inner diameters.https://www.mouser.ca/ProductDetail/Souriau/UTGX710E6P?qs=IS%252B4QmGtzzpREnWAI0%2FCsQ%3D%3D

author: fzabkar
author_rank: Super Contributor
timestamp: July 20, 2022, 12:13:45 am
content: I doubt that you would be prepared to pay US$49 for it:https://www.furunousa.com/en/products/000-167-142

author: CrazyTiger
author_rank: Regular Contributor
timestamp: July 20, 2022, 05:38:19 am
content: I really don't mind paying for it. But furono told me to contact my local distributor,who is not replying me, anyway I can expect the shipping charges will be twice the price of the connector.

author: CrazyTiger
author_rank: Regular Contributor
timestamp: July 21, 2022, 05:41:02 am
content: Found the part number finally: SR30-10PF-6P(71)
Help me identify this GaN fet - Page 1
Forum section: electronics / repair

author: f14
author_rank: Regular Contributor
timestamp: February 27, 2022, 10:42:21 am
content: Hi GuysI need some information(datasheet) about this fet in picture. seem it from Chinese brand semiconductor?thank you very much!

author: abdulbadii
author_rank: Frequent Contributor
timestamp: February 27, 2022, 12:35:39 pm
content: find its schematic & function to deduct in/output operation point, online could be found the substiute equivalent

author: f14
author_rank: Regular Contributor
timestamp: February 27, 2022, 02:12:33 pm
content: I dont have schematic . it from GaN charger . seem this company too new or only privite sell
Help me identify this mosfet. - Page 1
Forum section: electronics / repair

author: jurgis1991
author_rank: Newbie
timestamp: June 20, 2020, 02:47:12 pm
content: [img src="https://ibb.co/y8nSZBV"]Dose anyone know where to get datasheet for this mosfet ?It is used in makita cordless fan.For controlling speed(PWM).

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 20, 2020, 05:50:05 pm
content: Do this in a few steps:1). Search for a few sites with SMD marking codes.2). Type the code on your FET into a few of those sites.3). Compare results.

author: fzabkar
author_rank: Super Contributor
timestamp: June 20, 2020, 10:02:46 pm
content: AOI4144, Alpha & Omega, n-ch MOSFET, 30V, 55A, 8mOhm Rdson:https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO(D,I,U)4144.pdf

author: jurgis1991
author_rank: Newbie
timestamp: June 21, 2020, 03:28:58 pm
content: Thanks for the help.How did you found out what device it was ?

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 21, 2020, 07:11:41 pm
content: If you google for "I4144 mosfet" it's on top of the hits.

author: Audiorepair
author_rank: Frequent Contributor
timestamp: June 21, 2020, 07:48:35 pm
content: I googled for 14144 Mosfet when this post first appeared, and found nothing.Now I realise the part is actually I 4144 where I is the letter "I", not the number 1.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 21, 2020, 08:00:46 pm
content: Quote from: Audiorepair on June 21, 2020, 07:48:35 pmYes, that's the difference between not finding anything and having it done in 10 seconds, been there, done that

author: Audiorepair
author_rank: Frequent Contributor
timestamp: June 21, 2020, 08:11:22 pm
content: One might think that manufacturers would try and avoid using letters such as I and O in their nomenclature, especially since devices are nowadays so much smaller and difficult to identify, particularly when they are burnt or blown up.

author: fzabkar
author_rank: Super Contributor
timestamp: June 22, 2020, 03:16:30 am
content: Quote from: jurgis1991 on June 21, 2020, 03:28:58 pmI recognised the logo, so that helped a lot.
Help me identify this relay - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: February 21, 2021, 11:26:28 pm
content: Hi All,I am trying to refurbish an old Thomson TRC-350 HF Transceiver. The ATU part is not behaving properly and I found most of the relays are very sticky. Would someone please help me identify the relays.

author: james_s
author_rank: Super Contributor
timestamp: February 21, 2021, 11:31:40 pm
content: I'm not a relay expert but they look fairly standard. Have you tried cleaning the existing relays? It looks like you might be able to pop the dust cover off and clean up any accumulated goo causing it to stick, or you might try degaussing them.

author: thermistor-guy
author_rank: Frequent Contributor
timestamp: February 21, 2021, 11:45:22 pm
content: "EE" = Eichhoff Electronics?Eichhoff p/n E3201 shows up in a Finder cross reference here:http://www.automation4less.com/pdfs/findercrossref.pdf

author: bdunham7
author_rank: Super Contributor
timestamp: February 21, 2021, 11:46:56 pm
content: If you have access to the Omron G2R series, I think they look the same. You'd have to match up the exact voltages, contacts and so forth.
Help me indentify components - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: November 26, 2021, 11:50:36 am
content: Hi,I got a Anritsu 331D which is failing self-test (intergrator fail). I see no RF level or sweep happening. Taking things apart i found the input section is defective, likely fried from high rf power injection.The amplifer, what I believe is NBB400 is dead, this can be easily replaced, but I am stuck with two component that have turned open, and sadly no marking on them. My only option is now is to compare it with another board which i dont have or by some miracle someone have the circuit diagram. Can someone help me out here.My Guess (i might be wrong:)Blue chip, is a 50 ohm resistor.The SOT23 marking (RS2) maybe a detector diode, it makes sense, since the output of amplifier is fed into test port, and there is not other circuitary to monitor the output powerBut the black chip, i have no idea what it could be

author: gamalot
author_rank: Super Contributor
timestamp: November 26, 2021, 01:04:31 pm
content: The one in SOT23 package with the RS2 mark may be SMP1340-005LF. The one in QFN package with the S218 mark may be AS218-321LF. They all come from the same company - Skyworks.https://datasheet.octopart.com/SMP1340-040LF-Skyworks-Solutions-datasheet-38206149.pdfhttps://www.richardsonrfpd.com/docs/rfpd/AS218-321.pdf

author: CrazyTiger
author_rank: Regular Contributor
timestamp: November 27, 2021, 06:20:53 am
content: Replaced the Qorvo NBB400 amplier and tried a 50 ohm resistor on the open resistor (blue 0603 chip resistor).I also removed the other unknown chip. Unit passed selftest and i see its measuring swr correctly..Its a good progressStill i am wondering the value of the other chip would be.
Help me repair a pc smps - Page 1
Forum section: electronics / repair

author: Jithin
author_rank: Newbie
timestamp: April 28, 2020, 12:11:39 pm
content: I have a pc smps which does not turn on when I connect the green wire to a black..the green is having 5v supply..when I connect this to motherboard the supply led (green) on the motherboard turn on but the motherboard does not turn on..I also found a 5v supply from another dark blue wire..I checked the motherboard using another smps and it works.. somebody help me repair this..

author: madires
author_rank: Super Contributor
timestamp: April 28, 2020, 01:32:21 pm
content: Most likely you don't want to hear this, but I'd recommend to buy a new one or get it fixed by someone experienced in repairing SMPSUs. Fixing an ATX PSU isn't a job for a beginner.
Help me repair my new Sanwa 360 analog multimeter - Page 1
Forum section: electronics / repair

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: January 27, 2021, 06:55:26 pm
content: I wonder if someone could say what is wrong with this meter. It doesn't zero out on the lowest ohms setting. It's brand new.Below is a link to a video.https://youtu.be/KQUHVD0IF7Inks

author: andy3055
author_rank: Super Contributor
timestamp: January 27, 2021, 07:21:59 pm
content: What model is it? Did you try to measure volts while in the ohms scale accidentally?Open it and look for burnt resistors.

author: floobydust
author_rank: Super Contributor
timestamp: January 27, 2021, 07:23:27 pm
content: Put in new batteries

author: maxxim
author_rank: Contributor
timestamp: January 27, 2021, 07:24:22 pm
content: Check the batteries first and if ok check R21

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: January 27, 2021, 08:52:41 pm
content: Thanks everyone for your help. I had one weak AA battery. I replaced it and now it works perfectly.
Help me source ED521 DC Calibrator's transformer - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: July 10, 2023, 08:25:49 am
content: Hi,I got a ED521 DC Calibartor with a defective transformer. The unit kept blowing its fuse, and upon checking I found the transformer itself the culprit. Just to confirm I isolated the transformer from the circuit, even with a series light bulb, the transformer produced magic smoke. Now what can I do?I can no longer find people who does rewinding for tiny transformer any more in my country. My only other option is look for donor unit or make this as a donor unit.

author: precaud
author_rank: Frequent Contributor
timestamp: July 10, 2023, 02:54:43 pm
content: I have a 520A parts unit, if that can be of use.
Help me to find Diode "14" mark datasheet - Page 1
Forum section: electronics / repair

author: TobiasG
author_rank: Contributor
timestamp: March 18, 2024, 11:48:46 am
content: Hello all,I would like to express my gratitude for the answers in advance.I found a diode in short circuit with the mark "14", could you help me to find the datasheet?Please check de image attached.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2024, 06:42:14 am
content: There are too many possibilities:http://markingcodes.com/search/c/14You need to narrow down the parameters. Can you show us a photo of the diode's surroundings?

author: artag
author_rank: Super Contributor
timestamp: March 19, 2024, 09:04:52 am
content: Those are all 3-terminal devices though - regulators etc.Assuming it's 2-terminal it might be an SS14.

author: TobiasG
author_rank: Contributor
timestamp: March 19, 2024, 12:03:29 pm
content: Hello fzabkar,attached more pictures about the diodeI think this is SOD-123FL

author: TobiasG
author_rank: Contributor
timestamp: March 19, 2024, 12:07:21 pm
content: look

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2024, 06:29:46 pm
content: I would trace the circuit in that area. It's still not clear to me what that diode does.I think this is the adjacent IC:https://www.onsemi.com/pdf/datasheet/fod3120-d.pdfI would clean up that flux, too.

author: fzabkar
author_rank: Super Contributor
timestamp: March 19, 2024, 06:32:24 pm
content: Quote from: artag on March 19, 2024, 09:04:52 amIf you are referring to my link, there are several pages of results. Keep clicking the "NEXT" button.
Help me to identify this inrush limiter / posistor. - Page 1
Forum section: electronics / repair

author: BMK
author_rank: Regular Contributor
timestamp: February 29, 2024, 08:37:27 pm
content: Hi All,Really struggling with getting datasheet for this PTC inrush limiter. I do not recognise manufacturers logo, and Google does not hit on the part number. Can anyone help? Pic attached.Markings. 400X CSW42Thanks.

author: abdolah
author_rank: Regular Contributor
timestamp: February 29, 2024, 09:04:17 pm
content: The photo is blurred , need good pics and the pins number or device model number

author: fzabkar
author_rank: Super Contributor
timestamp: February 29, 2024, 10:45:29 pm
content: https://www.tokopedia.com/bentshops/thermistor-ptc-2-pin-hitamhttps://images.tokopedia.net/img/cache/900/product-1/2017/11/11/0/0_31cfa3a7-eb5d-4db8-a3cf-46f547a5a455_864_1152.jpghttps://images.tokopedia.net/img/cache/900/product-1/2017/11/11/0/0_24e48935-eab2-455c-a7a6-036127cbf0c8_864_1152.jpghttps://web.archive.org/web/20160829152352/http://www.nscn.com.cn/pdf/remin/1.pdf
Help me to recognize this crystal resonator - Page 1
Forum section: electronics / repair

author: nikifena
author_rank: Regular Contributor
timestamp: August 01, 2020, 03:07:32 pm
content: Hi there. This is a board from Steinel heat gun.There is a micro msp430f4152. I thought it could be a watch crystal 32.768kHz, but I'm not sure. I put a watch resonator and it doesn't work. How can I find the value of this resonator?There is written M802D4Thanks in advice.

author: fzabkar
author_rank: Super Contributor
timestamp: August 01, 2020, 06:52:05 pm
content: The MSP430F4152 is an 8MHz MCU ...802 -> 80 x 10^2 kHz -> 8 MHz

author: nikifena
author_rank: Regular Contributor
timestamp: August 02, 2020, 09:29:58 pm
content: The clock system in the MSP430F41x2 is supported by the FLL+ module that includes support for a 32768-Hzwatch crystal oscillator, an internal very low-power low--frequency oscillator, an internal digitally-controlledoscillator (DCO), and an 8-MHz high-frequency crystal oscillator (XT1).Written in the datasheet.
Help me to Repair my Hart Scientific 1560 -2566 data logger - Page 1
Forum section: electronics / repair

author: salayhan
author_rank: Newbie
timestamp: September 01, 2023, 01:26:00 pm
content: Hello,Does anyone know what the NTC features that measure CJC on the Hart Scientific 1560 2566 Datalogger TC sockets are?

author: Swake
author_rank: Frequent Contributor
timestamp: September 01, 2023, 08:24:04 pm
content: Looks more like thermocouples. Most used is type K.

author: salayhan
author_rank: Newbie
timestamp: September 02, 2023, 05:32:31 pm
content: Quote from: Swake on September 01, 2023, 08:24:04 pmIt's not a k-type thermocouple. I've tried.I couldn't find the circuit diagram.I used 10k ntc. but what is the original ntc

author: Swake
author_rank: Frequent Contributor
timestamp: September 02, 2023, 08:49:42 pm
content: Ho, you mean those things glued on the connector. Didn't understand you first message very well with all those abbreviations.NTC, maybe, it can be a PTC too (think PT100).Best you can do is desolder and measure.Next is to gently remove the goo from that thing and read whats written on it.Or reverse engineer the circuit up to the chip doing the heavy lifting. With a lot of luck you can determine what it is based on an application note or maybe the voltage divider that it is part of.

author: mzzj
author_rank: Super Contributor
timestamp: September 03, 2023, 05:58:54 am
content: Quote from: Swake on September 02, 2023, 08:49:42 pmAccording to manual it is thermistor.--3rd. option is to try to substitute the component with resistance decade and follow the cold junction value on DUT.You might have to do this anyways if you need to fiqure out what Beta value to select for the NTC.You also need to adjust and calibrate the cold junction compensation after you have replaced the thermistor. See manual section 13.4.3 Calibration Procedure.Calibrating it to factory specification can be a bit tricky but there is alternative way of doing it.

author: Arhigos
author_rank: Regular Contributor
timestamp: September 03, 2023, 06:33:45 am
content: Quote from: salayhan on September 02, 2023, 05:32:31 pmWhite color stands for U-type thermocouple.
Help me to Repair my Korad k3005d - Page 1
Forum section: electronics / repair

author: anilchowdary
author_rank: Newbie
timestamp: August 31, 2023, 07:01:06 pm
content: hello all , recently i've charged a lead acid battery with my korad ka3005d , after a day it showing faulty readings, while on zero voltage range , it showing 3.3v output , i've inspected pcb nothing burned , everything fine but i got fulty readings , please help me solve this

author: Swake
author_rank: Frequent Contributor
timestamp: September 01, 2023, 08:36:45 pm
content: Search on this board and you'll find the answer or at least something very near to it and a schematic.
HELP- MESR-100 READING PROBLEM  - Page 1
Forum section: electronics / repair

author: neohanter
author_rank: Newbie
timestamp: February 26, 2025, 01:35:33 pm
content: hello everyonei have issue with my mesr-100 with out measuring from 0.1 to 10 ohm the device gives floating readings ! there is any solution to fix this issue any advice I will be appreciative
Looking for a Full NAND Dump for Keysight 34461A - Page 1
Forum section: electronics / repair

author: RichTamim
author_rank: Newbie
timestamp: July 18, 2025, 11:05:51 pm
content: Hi everyone,I’m working on restoring a bricked Keysight 34461A multimeter. The unit powers on but always fails during firmware update and then falls back into demo mode. I’ve read through the famous thread (https://www.eevblog.com/forum/repair/agilent-34461a-corrupted-flash/) and tried the following steps:✔️ Removed the original NAND (Winbond W29N01HVBINA, BGA63)✔️ Dumped its contents using XGecu T48 (only main data, no spare/OOB)✔️ Later purchased an RT809H with BGA63 adapter✔️ Re-read the original NAND using RT809H (still have it working)✔️ Wrote the dump to a brand-new chip, reinstalled on the front panel board✔️ Multimeter behaves exactly the same – stuck in firmware update failed loop → demo modeTried:– Pulling J14 (boot_sel) high via 10k resistor to enter boot mode – didn’t work– Connecting UART to front panel (via CP2102), but serial output is gibberish on all baudrates– Supplying external 3.3V to boot_sel – no change in boot behaviorI believe the firmware is corrupted and needs to be restored properly from a working unit. The original dump was likely already broken, and I cloned it 1:1.🟠 Now, I’m looking for a **full NAND dump with spare/OOB included**, compatible with RT809H, so I can flash it properly and try to recover this unit.If anyone has such a dump from a working Keysight 34461A, I’d be extremely grateful.Thanks in advance – and thank you to all the previous posters for the invaluable info.

author: zfq119116609
author_rank: Newbie
timestamp: August 01, 2025, 09:43:33 am
content: I have a complete NAND backup file. Please send me a private message
Help needed. Advantest R3172 tracking generator 16MHz offset frequency - Page 1
Forum section: electronics / repair

author: Samogon
author_rank: Frequent Contributor
timestamp: August 25, 2017, 02:30:33 am
content: Hi,Posted it in test gear but looks like it is more appropriate place for this topic.When i try to use TG on the unit it is sweeping +16MHz of center frequency set.I found it when tried to setup some test. And found that it will not track at all.I connected oscilloscope and see that it outputs proper amplitude signal but 16MHz about setting.Also connected counter and it shows same shift i guess it is exact 16MHz measured with zero span set.This SA had dead battery so i have setup new and calibrated, unit passed self calibration no problem.Looks like some programming error.As i understand TG uses same span as spectrum analyzer uses to sweep. But how it is shifted 16MHz up?Can someone give advise where to start please?Thank you.

author: [steven]
author_rank: Contributor
timestamp: October 17, 2022, 06:37:32 pm
content: Did you ever solve this? Got the same problem on my R3131
Help needed - Flyback controller IC identification - Page 1
Forum section: electronics / repair

author: ruthenianboy
author_rank: Newbie
timestamp: March 28, 2023, 01:21:00 pm
content: Hello all,A friend of mine asked if I could repair his wall LED lamp. The power supply/controller PCB title says it is "60W adjust the color power supply". It is dual color (cold/warm) remotely adjustable lamp. The measurement revealed MOSFET transistor is shorted and due to that current feedback resistors exploded and part of the PCB traces evaporated. I am trying to find the datasheet of the flyback controller IC in SOT-23-6 package with the marking "32139a 052A" (or "32I39a"). There is no optocoupler for feedback in this circuit if it means something. So datasheet will be helpful for the identification of the correct value of exploded feedback resistors (in the photo they are removed from PCB) and overall circuit topology.Thank you all.

author: dobsonr741
author_rank: Frequent Contributor
timestamp: April 30, 2023, 02:53:35 pm
content: This page will help to identify unknown flyback controllers:https://remont-aud.net/ic_power/Identify the Vcc, GND, feedback, driver etc. pins from the pcb, plug the PIN numbers into the webpage and it will give you matches.
Help needed for determining the problem with my LCD driver - Page 1
Forum section: electronics / repair

author: elepo
author_rank: Contributor
timestamp: September 01, 2019, 02:25:34 pm
content: Hi everyone.My LG L1720B 17" LCD monitor died a few weeks ago. I'm a "hobbyist" so I decided to see if I can repair it myself. I had repaired it once before by replacing bulged capacitors but this time it looks like the power supply and the main board(the one with the MCU and the connectors) are both damaged.So I decided to buy a main board for it and power that with an external power supply to see if the LCD panel itself is alive.I boughtthis cheap chinese LCD controller boardand tried hooking it up with the LCD panel. (It was very difficult because only the board itself was available where I live and I had to connect everything manually).Tho after wiring it to the LCD panel board and connecting it with a VGA cable to my laptop I got this extremely noisy and jumpy picture:However when the VGA cable is not connected to my laptop I get a very clear OSD screen:The first thing I would suspect would be that the LVDS cables are mismatched or there's something wrong with either boards, but since the OSD is working fine I'm confused as to why I can't get a clear picture when I connect the VGA cable to my laptop.Also, I can hack the original mainboard into almost working by replacing a damaged PNP transistor with a short. When I do that I get an almost noiseless picture, but the picture is extremely pale and barely visible.So I suppose the LCD panel is healthy?Here's a link to an Imgur albumwhere I have added more pictures and descriptions. I didn't want to occupy too much space here.More info:Monitor: 17" LG Flatron L1720B (~13 years old).Cable: Healthy VGA cable that works with other monitors.Original main board:https://www.ebay.co.uk/itm/302043220118Replacement main board:MT561-MD v2.1LCD Panel: LM170E01-TLA4

author: fzabkar
author_rank: Super Contributor
timestamp: September 01, 2019, 07:18:19 pm
content: Here is the service manual, just in case you need it …http://www.jordansmanuals.com/Default.aspx?Brand=LG&Product=Monitor&Model=L1720B

author: kjr18
author_rank: Regular Contributor
timestamp: September 01, 2019, 09:12:35 pm
content: Panelooksite reports this panel as 1280x1024 in pixels and with 8 bit 2 channel lvds, but without known voltage level. I guess you could try setting jumpers at C and G position and voltage at 3.3V. You can see what parameters you can set on this table on the back side: resolution, bits and channels. If this won't work, you can try 5V. This might work, seeing as this panel is at least 13 years old.And something is wrong with this resolution shown on OSD...
Help needed identifying a Zener/TVS Diode (Toyota ECU) - Page 1
Forum section: electronics / repair

author: Signal Simon
author_rank: Contributor
timestamp: April 28, 2024, 03:11:18 pm
content: I'm attempting to repair a Toyota engine ECU that it seems has had an over-voltage event, possibly failed alternator or loose battery terminal.I have found two failed diodes, D401 and D402 (Shorted) marked "1E 8D" which just seem like series diodes from the main power supplies, so have fitted 1N4002s in their place.However my mystery is D404.From the screen print, it's a Zener and is directly across the internal supply.One of its circuit tracks has blown open, so there was obviously more than just a bit of a transient.The diode is marked: T S5225 8.CThe T I'm assuming signifies Toshiba.It's in a substantial case 10mm diameter and 4mm thick, similar to a Motorola MR751 series.Can't find any reference online, it obviously isn't a 1N5225Logic says the Zener(TVS?) voltage should be in the region of 18 to 24VoltsAny help appreciatedThanks,Simon.

author: fzabkar
author_rank: Super Contributor
timestamp: April 28, 2024, 04:25:32 pm
content: This vendor rates it at 27V 3W, if you can believe it:https://www.lazada.vn/products/voltage-regulator-s5225-zener-3w-27v-thao-may-test-ok-i2423357599.htmlHere is a discussion about a circuit that uses this diode:http://www.subaru-svx.net/forum/showthread.php?t=59362&page=2The diode appears to be D4 in this circuit diagram (D4 is a place holder):http://www.subaru-svx.net/forum/attachment.php?s=76c57ef43ebf18a1041f22109cc5937f&attachmentid=16095&d=1331498282The IC (μPC1251) in that diagram has a maximum supply rating of 32V:https://www.renesas.com/us/en/document/dst/upc1251-upc358-datasheet

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: April 28, 2024, 06:52:58 pm
content: These type parts are used in many OEM vehicle modules for overvoltage protection and reverse voltage protection, voltage rating is usually around 27V.Most of the time they are failed shorted blowing fuses if they are defective and did their job to protect unit from further damage.Not to say failure is common it is not but is most likley if above conditions are met.You did not say year made but capacitors are a common problem in many of these units.Jeff
Help needed identifying component with blown-off piece on a TJ05B marked PSU - Page 1
Forum section: electronics / repair

author: anti77
author_rank: Newbie
timestamp: November 17, 2024, 06:51:17 am
content: This IC seems to be made by Shenzhen StrongLink Electronics Co.,LTD (http://eng.STGLSEMI.COM), however their website and catalog:http://eng.stglsemi.com/UploadFile/2014862113928021.pdfseems last updated in 2014. The IC is SOP-8 packaged.Please help, it looks very similar to LY2596, but that's available only in DIP-8 package.

author: anti77
author_rank: Newbie
timestamp: November 17, 2024, 07:02:05 am
content: I know it would be easier to just replace the entire module, however I'm interested in this because there is no optocoupler feedback, nor any power mosfets. Seems to be made with a minimum number of components, supplying around 4-500mA.

author: u666sa
author_rank: Frequent Contributor
timestamp: November 17, 2024, 07:10:20 am
content: Imformation is here -https://radiokot.ru/forum/viewtopic.php?f=11&t=155432&view=next
Help needed identifying resistor type - Page 1
Forum section: electronics / repair

author: NOON Design
author_rank: Contributor
timestamp: May 18, 2023, 09:11:42 pm
content: I'm repairing a hair straightener for a friend and only fault I've been identify so far is one of these resistors. R8 is measuring about 52ohms as expected, R11 is in the megaohms. What I don't know is what's special about these resistors to be able to source a replacement. Is anyone able to identify the type and characteristics? Would it be a fusible type?

author: NOON Design
author_rank: Contributor
timestamp: May 18, 2023, 09:17:38 pm
content: Shortly after posting this I managed to find a repair article on this model, apparently a common failure.https://www.ghd-repair.co.uk/common_faults/r8_resistor.html
Help needed identifying SOT23 with 43R symbol - Page 1
Forum section: electronics / repair

author: fripp
author_rank: Newbie
timestamp: November 26, 2024, 11:24:33 am
content: Can anybody shed any light on what this component maybe (Symbol=43R, Package=SOT23). Center pin is grounded. I have tried all the repositories I know of but no matches for 43R only 43 which throws up many options.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: November 26, 2024, 12:36:14 pm
content: Hello fripp,Something like aZR431(TL431) ?If you can power the board, measure the voltage at pin 2 (Vz) : it should match to ± 2 % with the calculated value (SMD resistors circled in blue; I cannot read the values because of the limited resolution of the provided pictures). The formula can be found in the datasheet (see 'shunt regulator').

author: fzabkar
author_rank: Super Contributor
timestamp: November 26, 2024, 12:59:30 pm
content: http://markingcodes.com/search/c/43rhttps://www.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+43r+sot23

author: fripp
author_rank: Newbie
timestamp: November 26, 2024, 02:04:51 pm
content: Thanks I think I am on the right track now
Help needed identifying the specs and topology of a resistor network (sorted) - Page 1
Forum section: electronics / repair

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 08:46:13 am
content: I have a resistor network I'm unable to find a datasheet or specs online. It has 8 pins and is marked "IHR-4-103 JB". It looks like the one in "photo1".I'm not familiar with this kind of thing. Google tells me there can be many kinds of internal wirings. Shown in "photo2" are two types that are included in the component lib of KiCAD. There are other configurations, obviously.I don't want to take it off the board to measure because very likely it's not broken but will be broken by me. So I've managed to measure the resistances across all of its pins (in photo3). Being inline obviously may have an impact on the readings. But anyway, in experienced eyes this might be obvious.(Pin 1 in the table is the one marked with a dot, at the LHS of the label.)Help please! What do the specs look like (particularly topology)? Thanks.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 16, 2023, 08:56:05 am
content: Looks like 4 x 10k, 4 individual resistors, 1 of 10k resistor between pins 1-2, and 3 more between pins 3-4, 5-6 and 7-8.

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 09:06:50 am
content: Quote from: RoGeorge on February 16, 2023, 08:56:05 amDo you mean something like this?That cannot be correct. Because if it was, the reading between some pins will be 0, such as 2/3.But Thanks!Edit: Ok, I think you mean other readings are due to inline?

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 09:10:44 am
content: I think you mean this.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 16, 2023, 09:12:45 am
content: Yes, like this:

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 09:15:25 am
content: Quote from: RoGeorge on February 16, 2023, 09:12:45 amI believe that's it!So "IHR-4-103" probably means:"I": Independent? Or isolated (less likely)"H": ?"R": Resistor without a doubt"4": Four(4) resistors surely"103": 10e3Thanks!

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 09:28:35 am
content: So this is the component in my lib for KiCAD schematics!

author: gamalot
author_rank: Super Contributor
timestamp: February 16, 2023, 09:40:17 am
content: My guess

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 09:44:12 am
content: Quote from: gamalot on February 16, 2023, 09:40:17 amMan, with a quick look --- this is well-done!

author: gamalot
author_rank: Super Contributor
timestamp: February 16, 2023, 10:37:25 am
content: I think I was wrong. it should be like this:

author: max.wwwang
author_rank: Frequent Contributor
timestamp: February 16, 2023, 07:38:49 pm
content: Quote from: gamalot on February 16, 2023, 10:37:25 amThe attached should be the case. Thanks. Well done! You've deciphered not only the component but also the circuit around it. You are a star!
Help needed identifying this component - Page 1
Forum section: electronics / repair

author: cpposteve
author_rank: Regular Contributor
timestamp: May 25, 2023, 07:36:47 pm
content: Can anyone help identify this component please. initialy thought it was a diode but no cathode marking so unsure. i have 3 control board where some are short and some open circuit and need to know what they are, their purpose and where to source replacements as need to get these boards fixed. Thanks in advance

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 25, 2023, 08:17:46 pm
content: Is this in automotive equipment?Is one terminal wider than the other? Not obvious on your photo as it appears that the pads have followed the component.There is an indent at one end.Dimensions could help... You're not doing the best to get attention.How about MSMP15A ? (15V TVS General Semiconductor now Vishay)

author: golden_labels
author_rank: Super Contributor
timestamp: May 25, 2023, 08:29:28 pm
content: While asking for component identification, always provide the context. Manufacturer, model, and subcomponent of the device it was found in, and a decent photo of component’s surroundings. It is crucial information for a successful identification.The component bears aGeneral Semiconductor logo, since 2001owned by Vishay Intertechnology. From the photo it’s hard to tell the package; probably some DO-214 or SOD-128, but the size remains unknown and it’s missing the cathode marking.Vishay’s diodes body markings catalogmay shine some light. Theirline of TVSshas a component with “BM” marking (SMAJ15A); but — given the lack of the cathode marking and the lack of context — this is a weak guess.

author: cpposteve
author_rank: Regular Contributor
timestamp: May 25, 2023, 10:04:28 pm
content: Thanks for the info. i did a google reverse image search of the logo and found the manufacturer. also i figuerd it may of been a tvs as there was no cathode marking, looking this up with the BM marking does point to it being a bidirectional TVS diode rated at 15v which makes sense as this is fitted to a 12v power distribution board for a boat. this is protecting the hef4013bt's however all but 2 of these have been wiped out along the way so lots to replace on this.
Help needed Leader LBO-508A Oscilloscope power transformer smoking - Page 1
Forum section: electronics / repair

author: tonybob56
author_rank: Newbie
timestamp: December 15, 2019, 03:13:43 am
content: Can someone tell me where I can get a replacement transformer for my LBO-580A as soon as I supply power the transformer starts to smoke and crackle.I was given it from a friend and it may have other problems as some genius had put a 10amp 250 v fuse into it.(should have been 0.25amp 240 v)I was thinking that I may have to use a couple of transformers and would like to know if anyone has any ideas .I am in Australia and the cro was set for 240v but I have set my work bench to run 110v or 240v as needed.

author: Smoky
author_rank: Frequent Contributor
timestamp: December 16, 2019, 02:10:30 am
content: Welcome to the club!Odds are you will probably have to scrounge for a transformer from another oscilloscope.I'm working on a LBO-302 oscilloscope and the transformer in mine does not match the transformer in the schematics.If you do find a parts machine, check or make sure that you ask the seller what the Secondary winding output voltages are written on the label to ensure that you're getting the correct one.I'm guessing that the higher-rated fuse, allowed the fault within the scope, bring the transformer to an early demise. Which is probably obvious.Good luck with your project!

author: andy3055
author_rank: Super Contributor
timestamp: December 16, 2019, 03:11:40 am
content: Here is a link to the service manual:https://www.opweb.de/english/company/Leader/LBO-508If the mains transformer is smoking, That is a sign of some serious short in the primary supply rails. You should be able to find the culprit fairly easily by just using your multi meter. There must be a leaking capacitor most likely. However, depending on the extent of the damage in the transformer, you may still need to replace it. Even if you find a working transformer, don't replace and switch it on until you are certain you have identified and replaced what is causing the short.If you find anything on eBay or a similar site, that might be your option as it is an old scope.Good luck.
Help needed  - repairing Mastech DMM - Page 1
Forum section: electronics / repair

author: bborisov567
author_rank: Regular Contributor
timestamp: November 24, 2022, 08:15:26 pm
content: After measuring higher voltage than rated with my Mastech M890F occured the following problem - no matter in what range when i turn it on the value gradually starts going high and after a few seconds reaching "1. " on the display. I replace the 7106 ic inside and C1, C2, C4, C5 but there is no change. Schematic is attached. Can you suggest where to look next?

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: November 25, 2022, 05:33:06 pm
content: I'd replace that TL062, probably the NPN Transistor in the output stage has gone leaky or short.TL062 does not like inut voltages beyond it's power rails, so it might have seen overvoltage.Also check if Vref is stable.

author: bborisov567
author_rank: Regular Contributor
timestamp: December 06, 2022, 02:15:18 pm
content: It turned out that both LM358s were blown and since they are getting power from the 7106 ic, they were shorting Vee to ground. After replacing them everything is working.
Help needed to identify ic marked c4x - Page 1
Forum section: electronics / repair

author: spd
author_rank: Contributor
timestamp: January 27, 2020, 04:59:39 pm
content: I am trying to repair a bluetooth circuit board, no schematic available, that has an ic with 8 pins (four on two sides) with marking c4x. Could not find anything matching thison google or smdmark.Would greatly appreciate any help.Thankas

author: fzabkar
author_rank: Super Contributor
timestamp: January 27, 2020, 08:33:56 pm
content: Could we see a photo of the PCB?

author: LateLesley
author_rank: Frequent Contributor
timestamp: January 29, 2020, 01:32:26 am
content: You are positive it is 8 pin, and not 10 pin?There's this in a 10 pin package -https://www.analog.com/media/en/technical-documentation/data-sheets/AD7946.pdf

author: spd
author_rank: Contributor
timestamp: January 29, 2020, 10:27:24 am
content: Thanks fzakbar and latelesley. Here are two photos os the circuit board. I had removed two capacitors seemingly attached to it, as it is getting hot, but they seem OK.

author: fzabkar
author_rank: Super Contributor
timestamp: January 29, 2020, 06:00:33 pm
content: It looks like a dual step-down converter, assuming the two larger passives are inductors.

author: sxn1
author_rank: Newbie
timestamp: January 29, 2020, 07:59:19 pm
content: https://www.yoycart.com/Product/525832996156/maybe this will help you.

author: spd
author_rank: Contributor
timestamp: January 30, 2020, 07:08:45 pm
content: Thanks fzakbar and sxn1. The ic in the link sent by sxn1 is 10 pin but the one on the circuit board is 8 pin. I have another similar circuit board on which the same ic is marked c4y.I am not sure if this ic need to be replaced as it is getting very hot to touch.

author: fzabkar
author_rank: Super Contributor
timestamp: January 30, 2020, 11:05:33 pm
content: Measure the voltages at the inductors on your good PCB. They should be the supply voltages for the other chips on the PCB. I suspect that the IC is getting hot because it is being overloaded by one of the other ICs.

author: spd
author_rank: Contributor
timestamp: February 01, 2020, 03:26:09 pm
content: fzakbar, thanks unfortunately the other pcb is also not working. If I had been able to identify and perhaps replace the ic, it would have helped. This belongs to a bose soundtouch 30 series III,for which no circuit diagram is available.

author: fzabkar
author_rank: Super Contributor
timestamp: February 01, 2020, 05:28:39 pm
content: I would identify the other ICs and determine whether their Vcc/Vdd pins are connected to either of the two inductors. This will confirm that the C4X/C4Y IC is a switchmode regulator.I couldn't identify all the other ICs, but here are two of them:PCM1804:https://www.ti.com/lit/pdf/sles022AIC3256:http://www.ti.com/lit/gpn/tlv320aic3256Edit:I'm assuming that your device is something like this (but with different pinout):https://www.maxlinear.com/ds/xrp6668.pdf

author: spd
author_rank: Contributor
timestamp: February 03, 2020, 04:49:02 pm
content: Thanks for your suggestions, I will try to work on them.
Help needed to identify SOT23 component 418Q1 - Page 1
Forum section: electronics / repair

author: fripp
author_rank: Newbie
timestamp: November 27, 2024, 11:44:09 am
content: Can anybody help me identify the component in the picture below. SOT23 symbol 418Q1. I believe it is a voltage regulator but it seems to have failed. Not sure what the output voltage should have been. Closest I have found is Fortune FS8854 but they don't list Q1 as a voltage option on the datasheet I can find. And it seems to be obsolete now. Manufacture date was 2019.

author: fripp
author_rank: Newbie
timestamp: November 27, 2024, 05:02:20 pm
content: Reverse engineering has given me this schematic, but no clue to actual voltage from the 418Q1 regulator. It is powering switched mode voltage sensing control circuitry from a 12V battery charger.Any insights or strategy to progress gratefully welcome.At the moment the output voltage from the regulator just tracks the input voltage up to 14v, I haven't taken it higher. When the VAC is supplied to the Switched Mode PSU it constantly trips into over voltage mode and resets every few seconds or so. I think this is from the 431 Zener detecting the over voltage in the control circuit supply and tripping the opto.
Help needed to repair Soldron 878d - Page 1
Forum section: electronics / repair

author: PSYK3D
author_rank: Newbie
timestamp: September 20, 2016, 07:05:50 am
content: Hi I have a soldron 878d soldering and rework station. Its one of those knock off of knock offs with a 936 style iron and a 8 pin hot air gun.I have been happily using it since a year without any issue. Yesterday, while working with only iron, the hot air gun suddenly started blowing air at full speed like there's no tomorrow. Everything else works fine, the iron works nicely, the hot air element is heating up without issue, but I have lost speed control of the fan, it just goes at full speed all the time. Here is what I have tried so far:1) Classic power cycle - didn't work2) Open up the hot air gun, nothing looks funny3) Open up the base station, checked the pcb, nothing is burnt, __However__, I found a rebellious 67k resistor who wandered too far. I have spent hours finding where it came from but no success. I'm thinking that is the culprit. The resistor seems to be broken, not burnt nor desoldered.I would be grateful to you guys if you could help me solve this issue. If you have a similar model with similar pcb, can you please help me find this little resister's home?Thanks

author: RussD
author_rank: Contributor
timestamp: September 20, 2016, 08:26:04 am
content: little or no service information for theseyou can get pdf's of the IC's they have application schematics might helpyour stray resister might have shorted something best bet is follow tracking backsurface mount devices can overheat and fall off what type of resistor is it?the fan driver will probably be a transistor 67k could be hold down on the base junctionfind the fan OP and measure inputs to that device

author: iocare
author_rank: Newbie
timestamp: September 25, 2020, 01:35:38 pm
content: Good to see someone with soldron hot air station.My station was also working fine from last few years but suddenly stop working recently.My issue is similar but in my case my fan stopped working entirely. Heating element starts for sometime and just nothing happens.For me also soldering iron works fine without issue, temperature display is fine.I also ordered another hot air gun from soldron but its same issue.I tried replacing TIP121 transistor used for heating element/fan in hot airgun, but still nothing worked.Tried contacting support here in India , they responded earlier and asked me to send station but I could not send as its only station I have for smd.Now due to COVID no one is responding there.Any thought if know about this problem.?
Help on Dell 2007fpb conversion to led - Page 1
Forum section: electronics / repair

author: Mikey5791
author_rank: Contributor
timestamp: December 04, 2020, 11:13:19 am
content: Hi forum friends,Got this working monitor from a friend but all the ccfl bulbs seems to be dead. So i am planning to convert those ccfl to led. The pcb consists of 3 separate boards from my image img 090901. My led conversion kit requires me to look for enable on off pin and DIM pin. But on the board there is no marking.Looking at the power board and inverter board from img 091042. On power board, there is one row of 9 pins with label CN 701 and black color wire is pin 1 being nearest to the ground screw hole while grey color wire is pin 9. On inverter board, the grey color wire pin 9 is nearest to label CN807.Next i searched for pwm chip OZ964GN datasheet fromhttps://www.alldatasheet.com/view.js...chword=OZ964GNFound out pin 3 is enable and pin 14 is DIM. Using an analog multimeter i trace back continuity of pin 3 of pwm to pin 1 black wire on power board. However, i was unable to find the connecting pin when i probe pin 14 to trace back to power board. There is no schematic for this monitor when i google. Can someone kind enough to help me on this?

author: rusosnith
author_rank: Newbie
timestamp: August 15, 2025, 04:23:19 pm
content: Have you managed to figure it out?
Help please to identify chip - Page 1
Forum section: electronics / repair

author: Testtech
author_rank: Regular Contributor
timestamp: November 22, 2022, 05:14:25 pm
content: I need a bit of help to identify this gate drive SMD part.Thanks!

author: DavidAlfa
author_rank: Super Contributor
timestamp: November 22, 2022, 05:56:17 pm
content: TPS2829

author: fzabkar
author_rank: Super Contributor
timestamp: November 22, 2022, 05:58:20 pm
content: https://www.ti.com/packaging/docs/partlookup.tsp#divlineThe search results at Texas Instruments include TPS2819 and TPS2829, "2-A/2-A single-channel gate driver wih 40-V VDD".

author: DavidAlfa
author_rank: Super Contributor
timestamp: November 22, 2022, 05:59:52 pm
content: 2819 is "PADI"

author: Testtech
author_rank: Regular Contributor
timestamp: November 22, 2022, 08:33:28 pm
content: Thanks to all!I didn't realize there was a part lookup for the marking.

author: fzabkar
author_rank: Super Contributor
timestamp: November 22, 2022, 08:59:37 pm
content: Here is another one:http://www.smdmark.com/en-US/search/code?id=payi
Help please to repair 5800x CPU - Page 1
Forum section: electronics / repair

author: Nick2theD
author_rank: Contributor
timestamp: May 16, 2025, 08:04:30 pm
content: Wondering if anyone can help me please. I have a tendency to make problems for myself. I delidded a 5800x processor a while back. (Pointless) Recently i wanted to redo the liquid metal. After cleaning the old off, i wanted to redo the varnish protecting the caps because i was worried the isopropyl may have fatigued it. well cleaning this off i put some kitchen soaked in acetone over it however it dried slightly and when i removed it i removed one of the caps. thankfully the cpu pads seem ok after wicking them but the cap it’s self seems damaged. It has 8 legs and i think it’s a 0603 multicap according to chat GPT. Does anyone by any chance know the value?Thank youNick