hybridfree/eevblog-posts huggingface dataset:
Ge-nnn universal replacement transistors - Page 1
Forum section: electronics / repair

author: rodd
author_rank: Regular Contributor
timestamp: October 23, 2019, 09:37:50 pm
content: Hi,I happened to get my hands on a lot of old GE transistors in plastic bags.All of them are marked GE-nnn where nnn are numbers ranging from 10 to 272.The bags have a white label where the major transistor parameters are listed.I became curious about them and googled for more information, but I could not find any databook or cross reference guide.They seem to belong to a "universal replacement type" line of products like RCA/SK, Motorola/HEP, NTE, ECG, etc..I could find many GE transistors guides but they contain only information about JEDEC types.Is there any place I can find more information about them?Thanks,Roger
GE Power Supply board model IM0061A - Page 1
Forum section: electronics / repair

author: artuzac
author_rank: Newbie
timestamp: August 02, 2023, 08:54:38 pm
content: Hi, For a GE PS board model IM0061A. I need the circuit diagram.Any help will be appreciated. Please.PS IM8845 circuit diagram will also help.THANKS
GE Y 8 1502 - What is this part? - Page 1
Forum section: electronics / repair

author: Zapped
author_rank: Contributor
timestamp: January 19, 2021, 10:18:13 pm
content: Any idea what this part is? Marked GE Y 8 1502 . Board says D12 but no polarity marked and doesn't look like any diode I've seen. From 1989 Chamberlain garage door opener circuit board. No schematic, but looks to be across a relay output carrying 120V. Searches have returned nothing of value. Also looking for schematic for Chamberlain board part number 41A3040. Board has "14LG300F" on the screen.

author: fzabkar
author_rank: Super Contributor
timestamp: January 19, 2021, 10:24:44 pm
content: General Electric MOV?Littelfuse, V150LA2, 150VAC, 13W, marking 1502:https://m.littelfuse.com/~/media/electronics/datasheets/varistors/littelfuse_varistor_la_datasheet.pdf.pdfhttps://datasheet.octopart.com/V150LS2-Littelfuse-datasheet-7552464.pdf

author: Zapped
author_rank: Contributor
timestamp: January 19, 2021, 10:29:29 pm
content: Should have looked harder. Looks like a 150V MOV

author: srb1954
author_rank: Super Contributor
timestamp: January 20, 2021, 01:25:22 am
content: I concur with fzabkar. It is a V150LA2 MOV.It is odd that it has burnt out by the lead with very little discolouration of the MOV body. Normally when MOV fails you would expect the body of the MOV to heat up considerably causing discolouration and cracking of the epoxy coating.

author: nanodocl
author_rank: Contributor
timestamp: January 22, 2021, 10:28:21 pm
content: Is the "D" letter stands for voltageDependent resistor?
GEFANUC PLC - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: November 04, 2020, 10:22:24 am
content: hi AllI have a GEFANUC Power Supply Module that Flashes P/S Faulty LED at power onModel IC695PSA140Does any one one have the schematics or the rear panel Pinout details of 5.1V dc, +24V dc and 3.3 V DcThanks in advance
GenComm GC7105B (base station analyzer) stuck on boot - Page 1
Forum section: electronics / repair

author: Event0
author_rank: Newbie
timestamp: September 28, 2021, 08:19:42 pm
content: Hi everyone,I have recently acquired a GenComm (the company that became JDSU and now VIAVI) GC7105B base station analyzer for my ham radio uses.The problem is... that it's broken (bought on ebay for 150€), in particular when i turn it on, after the first boot screen, a second boot screen appears and then the analyzer get stuck, i think it might be a "software" related issue. i tried booting it just with the main board (and the front panel) but the problem remains, on the sd card inside there are just a few files.I couldn't find anything about this product online , no firmware or recovery files, not even a tread about my problem...I have also tried using JDView and it seems to connect and download data from the Analyzer just fine.Anyone who has this Analyzer is willing to exchange some info, maybe a way to acquire a new firmware?

author: pcwrangler
author_rank: Regular Contributor
timestamp: September 29, 2021, 12:01:08 am
content: I'm not familiar with that device but if you don't get any other leads try looking for a serial header on the board somewhere. Watching a boot log might provide hints to the problem. Good luck, I hope you fix it. Nice bit of kit for the shack.

author: testpoint1
author_rank: Frequent Contributor
timestamp: September 29, 2021, 12:43:22 am
content: Quote from: Event0 on September 28, 2021, 08:19:42 pmyou can find the FW chip, try to backup and flash other good FW.

author: xrunner
author_rank: Super Contributor
timestamp: September 29, 2021, 12:51:16 am
content: Quote from: Event0 on September 28, 2021, 08:19:42 pmHi. First - I know nothing of this particular unit. But I have repaired a whole lot of test equipment. If you are comfortable taking it apart, I would look for any cables that can be re-seated. Doing this might restore a loose pin and enable some communication or logic level to be restored. Might be worth a try.

author: CJay
author_rank: Super Contributor
timestamp: September 29, 2021, 02:02:22 pm
content: If the PC viewer software connects and works then that would indicate the machine is booting, what data are you able to download?Could it be that the screen isn't 'stuck' and the analyser is is some sort of 'remote' mode where the screen isn't updated?

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: September 29, 2021, 03:45:56 pm
content: You can try to gain root access with this method:https://www.eevblog.com/forum/repair/jdsu-jd745a-base-station-analyzer-repair-log/msg3425112/#msg3425112Viavi/JDSU/Gencomm Firmware is usually available here:https://updatemyunit.netBut your unit isnt listed there
Gencomm GC7106A -no display of noise and signal- how it solve - Page 1
Forum section: electronics / repair

author: copycat
author_rank: Newbie
timestamp: March 17, 2021, 01:52:48 pm
content: Hi all,Two weeks ago I charging battery in my GC 7106, and after turn on, I noticed that the noise is not displayed on the screen. When you press the auto scale button, device is doing "click- click-click" by internal relay, and after delay shows a error: Invalid value (-170dBm <= Ref Level <= 130dBm).I try use demodulation AM/FM, and have not any sound.Device too have second port for measured VSWR, I cheked it and no have any measured data, signal level reflection always min (-65dBm), no phase data.It errors present for full range, and for any parts. All supply voltages is ok and present. No any disconnect wire e.t.c.I have no another spectrum analyser, and I have no any parameter last IF (like freq, min\max lvl, etc), before ADC (AD6645) . From RF module gouse signal "FFT path" to ADC, and tuner (FFT path-> ADC (AD6645)-> Tuner (CG1012B) make IQ quadrature- > to SPARTAN-> to internal PC ).I sent signal from signal generator to Spectrum RF In, and measure by Power meter signal from IF (connected directly to "FFT path" ). I set F centr 1500MHz, span 100MHz,and on signal gen. F=1500Mhz,lvl -10dBm, no mod., and saw on Power meter like this- first noise ~-50dbm, next second -10dBm, next -40, next -50dBm, and and so on in a circle. In fact, I see noise floor, than my signal (-10dBm), than noise floor again. I try different input RF power lvl (from 0 to -40dBm), and IF show it level in fine accuracy.If I send 0dDm then power meter (connected directly to "FFT path" ) show 0 dbm, If send -10dBm then -10dBm, ... send -40 on FFtPath -40dbm. All it accompanied by sound works relays. On RF module present out from Log detector ad8362 (before FFT path), and it present any voltige, which match the readings of my power meter.I make a concluse, that RF from RF in to last IF (FFT path ) works ok, and trouble not an RF module but in ADC or\and digital calculation. The reference signal (10MHz ) is present, to ADC is coming signal ~82MHz from PLL, and it stable freq.I would like to check the ADC, but I do not know the level that can be applied to it, and the frequency. There is an idea to roughly determine the IF frequency by USB-rtl stick (or in another way), and send the signal from the signal generator directly to the ADC. Or in some way to check the operation of the ADC.Is the old tuner chip (cg1012b) is probably only used to receive a quadrature signal, how can you check if it works?Or am I going down the wrong path?YTO module has is really hi temperature, is it ok?The case was two unbroken Gencomm stickers, and inside mainboard dirty on flux, I clear it.I read nearest topic about jd745 repair, and now things may be I have software problem.I will be grateful for your attention to my problem, and suggestions for solving it .

author: copycat
author_rank: Newbie
timestamp: March 17, 2021, 02:16:37 pm
content: I added pictures IF ADC and RF&IF
General Radio 1490-G switch question - Page 1
Forum section: electronics / repair

author: gray5596
author_rank: Newbie
timestamp: January 18, 2023, 07:18:51 pm
content: After sitting for over 10 years, I tried to use my GR 1490-G inductor decade box. Discovered two of the rotary switches were flaky/intermittent. After opening it, found a light film of grease or lubricant on the switches. Some of the grease appears dried up. Does anyone know what is this grease is? (see attached picture)This test set is well made so before attempting to clean the switches, I thought it best to ask before I do something I might regret.

author: TizianoHV
author_rank: Regular Contributor
timestamp: January 18, 2023, 07:37:06 pm
content: Contact cleaner or even WD-40 should do(See Dave videohttps://youtu.be/fKrvtYS_6fImin 31.30)

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: January 18, 2023, 09:03:39 pm
content: I would ask this grouphttps://groups.io/g/GenRad/messagesThe stuff on your contacts is dried out lube, and probably could be washed off easily with IPA solvent, but since this thing is so valuable, I would ask first.

author: gray5596
author_rank: Newbie
timestamp: January 19, 2023, 12:43:46 am
content: Thanks for the replies! As Wallace noted, this is a fairly valuable unit and so i hate to damage the switches by cleaning them incorrectly.

author: jonpaul
author_rank: Super Contributor
timestamp: January 19, 2023, 01:22:15 pm
content: STOP! avoid WD40, leaves petroleum distallates residue, not for delicate electronic contacts!1. clean switches with 99% isopropyl alcohol2. very slight lube of shaft, bushings, perhaps one drop mineral oil3. Quality contact cleaner with long application tube, on switch contacts, we use Miller Stephenson, or tuner cleaner.4. throughly exercise every switch many times just after the contact cleaner.Afterwards allow to dry, use cotton to remove excess cleaner, test out.We have revived decade's old Genrad resistance and capacité decades and ratio boxes this way.Bon chanceJon

author: alm
author_rank: Super Contributor
timestamp: January 19, 2023, 02:00:41 pm
content: Something I would focus on, is to make sure to leave some sort of lubrication on the contacts. That's the problem with WD40: it's mostly a solvent with only some very light oils that will evaporate quickly. Exercising the switch contacts without any lubrication will likely result in excessive wear and tear. Jon's advice sounds good to me.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: January 19, 2023, 02:11:35 pm
content: As already said by jonpaul,WD 40 leaves a deposit. I don't know if should be characterized by the term grease or wax. It also attracts dust and dirt.Watch repair, locksmiths or even many gunsmiths will not use the stuff. If it is used as a solvent (it does a pretty good job of cleaning up old deposits) then it should be removed with IPWD 40 was invented as a water displacing solvent.However the WD 40 brand may appear on other products that are not the original formula.
Generic chinese fume extractor - Flood repair - Page 1
Forum section: electronics / repair

author: Junkwizard
author_rank: Newbie
timestamp: January 12, 2023, 07:54:13 pm
content: I have one of these:https://www.ebay.com/itm/125453545529I had a flood and it got toast. The motherboard looks wrecked but I'm hoping the blower is still functional, I'm really hesitant to throw away or replace it as they're expensive (even more so now) and I essentially have all the heavy parts. I figure worst case is I replace the blower and get a new controller (finding a motor to fit their setup internally seems like a nightmare), best case scenario is I find a replacement motherboard from the manufacturer but that's been a bust so far.My game plan right now is to buy a 3 speed controller and wire up the blower to see if it still works, if so I'll just size a grommet and drill a hole through the case and have the off the shelf controller dangle out of the thing.Any recommendations on cheap reliable blower controllers is extremely welcome and if (impossible) you know where spare boards for this thing are sold you are a god. There just doesn't seem to be a strong base of spares for a lot of these chinese goods.Flood gore attached for the curious.

author: FIXITNOW2003
author_rank: Regular Contributor
timestamp: January 13, 2023, 07:25:43 am
content: if the motor is good i would just use 1 of thesemotor speed controller 110vhttps://www.ebay.com/itm/294271232997?hash=item4483eeabe5:g:wKcAAOSwUNdiisrf&amdata=enc%3AAQAHAAAA0MWGHbFvbsewtnbx3K8H70nIxY9ysCrvyGUGD5%2FGkvZ9HKVJWK%2F%2F62kSoBmYiU1pd2nkM5%2BRdakZXdD%2BKQBHCVjT%2Fp3SS2m99cFJEiJ5CdLrmne6%2BzuQyVqxMtGhxPP93aZ%2FAyf3uAa2m0KfPk9LKfA9TmBe%2FgSvlat6KWvi7vlPCTPC0XrDh%2FJ89kwVz5dDStDdCxMvVc0ErygvY6CZoSraUb6v1E3l2nt%2Byot2ScdHRApftln6mt1KC50mFIPcD8VsNeLEeapOYHyM2kf867A%3D%7Ctkp%3ABlBMUJKPn6C1YQ
GenRad 1693 Zero calibration - Page 1
Forum section: electronics / repair

author: krasimir.k
author_rank: Contributor
timestamp: August 14, 2025, 08:08:53 pm
content: Hello,If somebody have the knowledge how to resolve the following problem, I will be very appreciated.I bought GenRad 1693 LCR meter few weeks ago and I got it yesterday. No error during power up test sequence, tested successfully in C/R/Z modes just to be sure that it works.Today I tried to make zero (open/short) calibration for eliminating stray capacitance according to the instructions from the manual. The instruction on page 14 (real page 38) explain the sequence:1. 2. [MEAS MODE] -> should be TRIGGERED mode3.     [=] 4.  or 5. After pressing short/open I should see GO led indicator lit and to get two zero or five as acknowledge.6. After that  button should be pressed and the GO indicator should be switched off.7. At the end of zero calibration the GO indicator should be again switched on.At step 5 I do not see the GO led indicator lit and the two 0/5 are not displayed.After pressing START button, the 1963 number disappear, but the GO led does not lit.The Go green led indicator is switched on for a part of the second when the LCR is switched on, so it should work.Tried to make GO/NO Go limits testing for resistor - only the NO GO indicator is lit. Here I'm not 100% sure that I'm making everything according page XXI (real page 23) from the manual.I'm going to design PCB with BNC connectors for calibration with 95.3 kΩ, 5.97 kΩ, 374 Ω and 24.9 Ω resistors. Hope the re-calibration will work.Thanks in advance!

author: krasimir.k
author_rank: Contributor
timestamp: August 15, 2025, 12:57:16 pm
content: In the case if somebody face the same problem:I asked IETLabs for help and they point to my fault: I always selected  for "Enter" Red LED, instead "Measure".After selection of "Measure" instead "Enter", I got the GO green led working.Sorry for the spam!Kind Regards
GENUINE Ramtron FRAM chip - Page 1
Forum section: electronics / repair

author: Stonie
author_rank: Newbie
timestamp: January 01, 2024, 12:45:21 pm
content: Hi All,I'm looking for a GENUINE Ramtron FM1608-120-P (DIP package) FRAM chip for my scope, preferably new or with low write/read cycles. Had an exhaustive look round so far to no avail... anyone know where I might source one from ?TIA, Phil.

author: ArdWar
author_rank: Frequent Contributor
timestamp: January 01, 2024, 12:54:31 pm
content: How about Cypress FM16W08 on a breakout board?Does it have to be the exact same make/model? I mean it's parallel, as long as timing is right the host won't know the difference.

author: CaptDon
author_rank: Super Contributor
timestamp: January 01, 2024, 07:44:36 pm
content: Just for kicks I looked on Ebay. Looks like every one in the DIP configuration is from china so most likely fake bullshit garbage!!! Not one looked like a reputable seller of real 'unused in original packaging' parts. Probably end up being an eeprom in disguise!! One seller even shows a generic picture with no part numbers.

author: Stonie
author_rank: Newbie
timestamp: January 02, 2024, 01:10:18 am
content: Nothing wrong with an FM16W08, this is my plan B... just thought I'd try my luck with an FM1608 first.And the very reason why I stated GENUINE, I simply don't entertain the Chinese a'hole feckers on the likes of eBay or Amazon... PERIOD !
Getting started with a hot air station. - Page 1
Forum section: electronics / repair

author: Yamin
author_rank: Frequent Contributor
timestamp: August 13, 2019, 07:56:38 pm
content: Hi guys, recently I got myself a hot air station to get started on SMD rework. I have been referring to a lot of online resources and have been practicing on scrap boards. However I noticed that removing components from certain boards are particularly hard. I'm assuming that on those boards the components were wave soldered on (not so sure though).The setting I have set on my station is ~350 degree Celsius and the fan at around half. Could you please suggest or give tips on where to set the parameters at.With these 'difficult' boards I tired increasing the temperature to 420 degree Celsius and then it seems to work, but not all the time. Would it be ok to go this high, generally speaking? How can you determine or know what temperature to use?What effect does changing the air flow speed have? In other words what the significance of this parameter?I noticed that under some components there were some flux like residue when removed from the board. What could it be? Could it be simply flux left over or glue? I would have included a picture but its not clearly visible.Lastly the nozzle size, can using a wrong size have an effect on the result on the work?Anymore tips/advice/suggestions on this would be greatly appreciated.

author: Mr. Scram
author_rank: Super Contributor
timestamp: August 13, 2019, 08:20:02 pm
content: Parts on wave soldered boards are glued on before soldering to keep them in place. That's probably why you're having trouble removing them.
GFG-8019G function generator no frequency output HELP repair please - Page 1
Forum section: electronics / repair

author: vehiculeselectriques
author_rank: Contributor
timestamp: February 11, 2024, 11:34:33 am
content: Hello,I have an old GFG-8019G function generator i would be happy to use again but it indicate 0000 Hz on LCD though gate led is blinking with frequency range selection.Connecting it to oscilloscope confirm there is nothing at outputfirst time for me do you have some experience on where to look please ?if it can help here or to someone one day i include 8019G manual and 8016G manual.i'm studying schematics 8016G manual as both models seem very similarthanks for your help

author: coromonadalix
author_rank: Super Contributor
timestamp: February 13, 2024, 05:19:08 pm
content: the counter can be internal or externalfor the signal path please read the manual gfg-8019g ..... you have good descriptions, down to the output amplifier section,you have everything in theses lines / explanations how to do diagnosticsusual checks : supply lines, you have many voltages
GHD 4.2B Working only in UPS  - Page 1
Forum section: electronics / repair

author: Lucky
author_rank: Newbie
timestamp: March 03, 2023, 11:00:40 am
content: Hi, I have this GHD hair straightener and makes a weird thing. If I plug it into the wall outlet, it doesn't make anything, but if I plug it into an UPS powered outlet, then it works perfectly.Can anybody help me?

author: Swake
author_rank: Frequent Contributor
timestamp: March 09, 2023, 08:12:26 pm
content: Sounds like the outlet has some issue or power limitation. I assume the plug makes good contact in the socket and the output voltage of the outlet is the same as the UPS.Try the GDH in another known good outlet.Try another device of 150W or more in the original outlet.Eventually try inverting the plug, I mean turn it 180° in the socket if the model of the plug allows for this? In this way it inverts fase and neutral.

author: Lucky
author_rank: Newbie
timestamp: March 16, 2023, 12:23:49 pm
content: Outlet works Ok, it delivers 237-240V but UPS delivers 220 exact.

author: m k
author_rank: Super Contributor
timestamp: March 19, 2023, 01:15:03 pm
content: Over voltage it then seems to be, not necessary the actual on.I assume you've swapped plug sides and it's double protected device and 2 prong plug.
KDL-46HX753 Ghosting  - Page 1
Forum section: electronics / repair

author: Pollock73
author_rank: Newbie
timestamp: October 31, 2024, 12:26:37 pm
content: I’m getting ghosting/flickering on my Sony KDL-46HX753 46” lcd tv. Has anyone got any suggestions?PS I’ve already tried replacing the T-Con board (but no change)
GI 636 Rectifier Diode equivalent - Page 1
Forum section: electronics / repair

author: intelogic
author_rank: Unknown
timestamp: March 18, 2023, 02:58:11 am
content: Hi all,I have a faulty rectifier diode marked GI 636 (General Instrument?) that I'm looking for specs and/or an equivalent for. It's part of the PS rectifier in a Rotel amp.None of my data books has this one, nor a search on the web. Would it be safe to assume a 1N5403 or 1N5404 would be suitable?Thanks and regards

author: floobydust
author_rank: Super Contributor
timestamp: March 18, 2023, 03:17:40 am
content: Uh what package is it, how about a pic, what model Rotel... the more info you give us the easier it is to help.1N540x has fat leads that may not fit the PC board and they are slow recovery.

author: fzabkar
author_rank: Super Contributor
timestamp: March 18, 2023, 03:42:26 am
content: Is this of any use?https://mirrorservice.org/sites/www.bitsavers.org/components/gi/_dataBooks/

author: intelogic
author_rank: Unknown
timestamp: March 18, 2023, 05:12:50 am
content: Thanks guys,Some pics added. It's a Rotel RA-412. Marked on the attached as D901 to D904, specified as "HIFI SPECIAL X4".Thanks also for the link to the data books - checking through now! The existing diode legs are ~1.3mm dia.Cheers

author: floobydust
author_rank: Super Contributor
timestamp: March 18, 2023, 06:01:43 pm
content: It's a Japanese build so I'd expect it would not use any American semiconductors. A JEITA package and possibly Sanken, Toshiba, Hitachi etc. The "hi-fi special" is likely soft-recovery for less rectifier switching hash and RFI ala 1976.In a perfect world I would replace all four, check width might be too wide body. Use fast recovery and this is only 2x25W so even 2A parts enough. By today's standards the power transformer is good for 500W lol.UF5404orSBYV29-200BYV28sinterglass SOD-64 is fat leads 1.35mm and expensive but best recovery1N5404if it's on the cheap.There should be an RC snubber across the transformer secondary but a scope check can show if there is too much ringing.Down the rabbit holehttps://www.desmith.net/NMdS/Data/Linear%20Audio%20-%20Soft%20Recovery%20Diodes%20Lower%20Transformer%20Ringing%20by%2010-20X.pdf

author: intelogic
author_rank: Unknown
timestamp: March 18, 2023, 11:47:35 pm
content: That's great! Thanks mate for your reply and the info.All understood and agreed on the replacement of all 4, UF5404 it is. I'll also do a full check afterwards, but yes on the transformer ratingoh and thanks also for the rabbit hole reading - you learn something new every day!Cheers
Gigabyte GA-H55M-S2 motherboard repair - Page 1
Forum section: electronics / repair

author: fubar.gr
author_rank: Unknown
timestamp: September 15, 2014, 03:39:36 pm
content: Successful Gigabyte GA-H55M-S2 motherboard repairNothing fancy, I just replaced a couple of mosfets. I had encountered the same problem before so I knew exactly what to look for. The hardest part of the repair was removing the bad mosfets without doing additional damage.The bad mosfets:Here replaced with salvaged mosfets from another motherboard:Also, how's my English? I'm not a native english speaker so I would like some feedback. Is the article intelligible enough?

author: SeanB
author_rank: Super Contributor
timestamp: September 15, 2014, 04:14:44 pm
content: Not bad, good write up, good English ( and a lot better than some native speakers) and a nice job there.

author: RobertoLG
author_rank: Frequent Contributor
timestamp: September 15, 2014, 07:14:56 pm
content: You're doing just fine, continue

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: September 16, 2014, 06:37:20 am
content: I completely agree with the posters above. Well written, well documented, decent pictures, links to datasheets are present.Can't think of any reasonable things on how you could improve the quality of your article. But if you really want me to do some nitpicking (I'm talking borderline level nitpicking here) this is wat I came up with:Albeit the images are well in focus and have a high enough resolution, some of the foto's show some evidence of an ever so slightly distracting use of a single flash camera. To prevent this you should have used multiple diffused light-sources like a professional photographer would have done.But hey... I recommend that you forget that I even mentioned this. I'm just rambling for the sake of it. And this is actually the only thing I could come up with.

author: fubar.gr
author_rank: Unknown
timestamp: September 16, 2014, 07:21:59 am
content: Thanks for the comments guys!

author: ftouhtouh
author_rank: Newbie
timestamp: November 08, 2019, 10:09:10 am
content: I want to know how to test this type of mosfet. can any one help me?thank you
GIGABYTE GTX 1070 ITX - Missing component after damage - Page 1
Forum section: electronics / repair

author: mickadoum
author_rank: Newbie
timestamp: November 15, 2021, 03:36:15 pm
content: Hello Everybody,Today I did find in my brother's stuff, an obviously dead GIGABYTE GTX 1070 as you can on the pictures, and when I see the price and the difficulty to get a graphic card, I would like to fix it and used it in a new desktop computer.I found on other pictures the reference of the missing component but I dont have the value:- C43- C1080- C1064- Fuse F4, I think a 10a 1206 could be good.Thank you very much for your help.

author: wraper
author_rank: Unknown
timestamp: November 15, 2021, 04:02:17 pm
content: The fuse is 1206 10A fast acting type. However this PCB was tampered with and gold fingers are covered with solder, which is very bad. Even after you clean them with solder wick, they may develop a bad contact with a socket during use. I suspect that the fuse was removed because a ceramic capacitor became bad and the power rail was shorted, the same as herehttps://www.eevblog.com/forum/repair/gigabyte-gtx-1070-mini-no-fan-spin-no-video-dead-cap-found/. So check if the rail is shorted to GND first (measure the top contact of the fuse to GND). I don't know the exact capacitance of those 3 missing capacitors, but the exact value is not critical, they are just decoupling caps. Something like 0805 10uF for larger ones and 0402 1uF for a smaller one rated for at least 16V will work just fine.

author: mickadoum
author_rank: Newbie
timestamp: November 15, 2021, 04:13:42 pm
content: Thank you very much for your quick reply.I will try to perform a good cleaning and order right the component. I will let you know the result.The rail will be checked.Thank you again
Gigabyte gtx 1070 mini capacitors and resistors under ATX plug - Page 1
Forum section: electronics / repair

author: Grucha9898
author_rank: Contributor
timestamp: June 14, 2021, 04:30:27 pm
content: Hi guysI need information of these components under ATX plug. Can someone measures they for me? 🤔

author: perieanuo
author_rank: Frequent Contributor
timestamp: June 17, 2021, 02:59:52 pm
content: so, in blue you circled some caps, in red inductorsimportant, inductors gotta be non-opened, caps not shortedwith one opened cap, that pcb may workwith opened inductor, it can'tcaps values are not very important, for bigger ones try 100n if they are opened/shortedwhy do you need those inductors value anyway?if they are not opened, you're goodfor caps, i made before observations

author: Grucha9898
author_rank: Contributor
timestamp: June 19, 2021, 08:54:52 pm
content: Thanks for reply!So on my pcb capacitors blown up and i dont have them, and someone take inductors :/ and places for inductors are empty. I dont know why someone take them but i must place them because its vram voltage line.

author: isopropilick
author_rank: Contributor
timestamp: June 25, 2021, 02:48:56 am
content: Maybe you can first try injecting voltage with a Lab bench power supply on that rail only to see if everything works fine (with the CC protection on of course) then I will use (as @perieanuo said) a jellybean 100nF ceramics to replace the missing ines and finnaly get the inductors... I think the most common value is 2uH.Good luck with the repair!
Gigabyte GTX 970 G1 graphics card - liquid damage, fried driver and MOSFET - Page 1
Forum section: electronics / repair

author: Komajster
author_rank: Contributor
timestamp: May 30, 2019, 01:06:21 am
content: Hello.I've got a Gigabyte GV-970G1 GAMING-4GD graphics card, from what I know it was damaged by some sort of conductive cooling liquid (water?) from the back side of the PCB, it had a fried driver on one of the power phases and one MOSFET that has welded itself to the board. I was able to remove a short inside the PCB between +12V and ground layer and the card somewhat works on leftover five phases, but shuts down under load. I think I will be able to solder a new MOSFET after isolating the inner PCB layer with solder mask, but this card has some strange drivers that I can't really find any information on, they are just marked as "AZJ", did anyone seen those and know their full part number or replacement?And the top side of the PCB where the burned MOSFET was:

author: Komajster
author_rank: Contributor
timestamp: May 31, 2019, 04:56:25 pm
content: Found it, its NCP5901Bhttps://www.onsemi.com/pub/Collateral/NCP5901B-D.PDF, the first two characters ("AZ") on the package are device code, the third one ("J") is date code.
Gigabyte GTX1060 6GB Lightning Strike - Page 1
Forum section: electronics / repair

author: BakaRed77
author_rank: Newbie
timestamp: August 27, 2021, 12:37:19 am
content: Please be kind because I have very little understanding of electric. I had a lightning strike that took out various electronics including my input board on a tv that was hooked to my computer graphics card. The GPU died with it. No Warranty. The rest of my PC was fine so I assume the jolt came in through the HDMI cable rather than the PSU. I am trying to figure out which part is bad and try to repair. I have a harbor freight multimeter but I do not really know what I am doing with it. I have seen several videos that weren't as helpful because I just wasn't knowledgeable enough to follow completely when I have different equipment to test with. I have not found an visible damage/burns. Can someone please walk me through what to test and what I should see as a result if the component is good or bad? I have attached an image of my card and multimeter. Again, please be kind to me I am really trying to learn this stuff.

author: Haenk
author_rank: Super Contributor
timestamp: August 27, 2021, 08:52:42 am
content: The overvoltage came through HDMI then (if the rest of the computer is fine), so you have to kind of backtrace from the cards HDMI connectors towards the GPU.However the components in question are so small, your bargain multimeter tips are probably too large to be of any use.

author: Miyuki
author_rank: Frequent Contributor
timestamp: August 27, 2021, 10:02:04 am
content: Quote from: Haenk on August 27, 2021, 08:52:42 amIf it comes to the HDMI side and not booting, then is no hopeChip is dead, there is no protection for anything bigger than small ESD, it goes directly

author: BrokenYugo
author_rank: Super Contributor
timestamp: August 27, 2021, 10:59:07 pm
content: Your enthusiasm to learn is appreciated, but this thing is probably a lost cause (i.e. main chip damaged) even if you did have the proper test and SMD soldering equipment to diagnose and repair. Just be glad it didn't smoke anything on the motherboard.
[solved] Gigabyte Intel NUC Failure - Page 1
Forum section: electronics / repair

author: gnif
author_rank: Unknown
timestamp: May 25, 2019, 05:47:32 am
content: Hi All,I was given a i7 nuc that appears to have had a PSU fault. The device powers on and the 1.8V, 3.3V and 5.0V rails are all stable, however it just let the magic smoke out of the CPU fan where it's dumping unregulated 19V into, so it seems the 12V regulation has failed. I am trying to trace it though but need to identify a 5 pin device that I think is a MOSFET, marked what looks like Q5RDT.See attached.This device is connected to the resistor just above PQ6 which is controlling PQ6's gate. At power on the gate is pulled low and 19V is produced on the other side. A continuity check shows a connection between the output of PQ6 and the CPU fan power pin. I would have thought that this signal should be switched as some kind of switching regulator producing the 12V, but I could be completely wrong. Any advice would be greatly appreciated.Edit: Think I found it, missed a switching reg on the other side of the PCB... its been so hot the solder balls have come out from under it.

author: gnif
author_rank: Unknown
timestamp: May 25, 2019, 06:21:35 am
content: Just for completeness, there is a buck converter near the fan header on the opposite site that has died, a GS9238, seems it's internal gate has failed short dumping full rail onto it's output.

author: Whales
author_rank: Super Contributor
timestamp: May 25, 2019, 07:55:15 am
content: Feed the board with 12V instead of 19/20VEDIT: I know that fans tend to be one of the few things that still use 12V on modern motherboards (other than the main bulk CPU/etc supplies, but they will probably be taking 19V direct on this board). I wonder if USB 3/C chipsets now also take 12v, and might have been damaged?

author: gnif
author_rank: Unknown
timestamp: May 25, 2019, 10:51:06 am
content: Quote from: Whales on May 25, 2019, 07:55:15 amUnfortunately not an option, the PMU wont allow it to start under 17V.Quote from: Whales on May 25, 2019, 07:55:15 amNot sure, I removed the IC and the system now starts up and doesn't reset. I found the same part on ebay for $6 for 5, so ordered some, in the meantime I can just power the CPU fan externally and learn what this little beast can doEdit: Yes I did measure the IC out of circuit and it is indeed shorted outEdit2: USB3 ports working fine even without the 12V rail.
Gigatronics 2520a Microwave Synthesizer - Page 1
Forum section: electronics / repair

author: awais7910
author_rank: Newbie
timestamp: March 14, 2022, 02:41:47 pm
content: Hello, I have a Gigatronics 2520a Microwave Synthesizer. There is some problem occur in the equipment. At a Frequency above 9.999MHz, it goes into unlock state and does not produce a frequency above 9.999MHz. Any one can help regarding the issue or provide some technical detail such as circuit diagram etc.
Gigatronics GT9000 20Ghz Microwave Synth Manuals/Service Information - Page 1
Forum section: electronics / repair

author: NyquistNoise
author_rank: Contributor
timestamp: October 24, 2020, 09:19:42 pm
content: Hi All,I've currently got a Gigatronics GT 9000 Microwave Generator on the bench for repair and am struggling to find a complete service manual. There seem to be lots of digital copies of the operation/service manual around on the web, however none of them seem to have Chapter 7, the chapter with all the schematics!It appears that the paper copy of this manual has chapter 7 in nice pull out A3 pages, so I assume that's why they skipped putting this in the digital version.I'm mostly after the downconverter/A16 schematic, as I'm having PLL lock issues below 500MHz at it appears at these frequencies this board handles the LOIf any kind hearted people out there happen to have the paper version of this manual/Gigatronics gurus who know this kind of fault have any information I'd be eternally grateful - starting to go mad stabbing in the dark at this fault!TIA!

author: NyquistNoise
author_rank: Contributor
timestamp: October 26, 2020, 08:06:19 am
content: So it seems I've mostly solved this one myselfthe Gigatronics 7200 is a very similar instrument, and shares a lot of the same PCBs, and this service manual is available on K04BB - So if anyone else is trying to repair a GT 9000 and wants schematics try here!

author: NyquistNoise
author_rank: Contributor
timestamp: October 31, 2020, 08:30:56 pm
content: Continuing my little thread here - for those that are interested, I had an LO unlock issue below 500MHz, which is downconverted.Following what I found in the schematics, I actually found out one of the SMC connectors on the downconverter board is supposed to carry a 1.666MHz or 5Mhz IF signal - but was totally missing! This explained the unlock issue.This lead me to the A201 board, which generated the 1.6 and 5 MHz IF using two identical circuits which fed different parts of the synthesiser. One of which was working, and the other (the one used by the downconverter PCB) was not.Following the signal (or lack thereof!) Ended up leading me to the "sampling mixer" RF block, which on very close inspection, revealed that some wire bonding which is normally attached to the step recovery diode, was no longer attached!As I have no ability to do any wire bonding, this is the end of the line for the <500MHz range!If anyone is scrapping/selling for parts and Gigatronics gear, you may have an interested buyer here

author: DaJMasta
author_rank: Super Contributor
timestamp: October 31, 2020, 09:31:23 pm
content: You do see these older gigatronics generators on ebay sometimes, and I've seen sellers trying to pass off smashed up units as "for parts" - maybe in your case that could actually be useful and if the face is smashed in they'll probably cut you a decent dealThey seem to be much more common than more recent gigatronics generators, for which I haven't seen any service information nor software.
Glassman LPD 150 40 - Page 1
Forum section: electronics / repair

author: Laszlo
author_rank: Contributor
timestamp: June 09, 2019, 06:19:56 am
content: Hi,I've found 3 of these 3phase to 150vdc 45A power supplies in a local skip but Googling for a relevant manual was unsuccessful so far. Does anyone have heard anything about this model at all?Out of the 3 power supply, two is in good working condition, and one is beyond economical repair.(Front screen smashed.)If nothing else, does anyone knows whether these ac-dc power supplies are safe to power up from single phase to 3 phase inverters?Is it worth contacting the company which bought up glassman to see if they have the manual available?Sent from my S60 using Tapatalk
GLI PRO XA2200 AMPLIFIER - Page 1
Forum section: electronics / repair

author: COLLANGE
author_rank: Newbie
timestamp: February 26, 2023, 07:28:10 am
content: Trying to fix a Gli pro xa2200 amplifier which powers on but has no output audio change a few bad resistors and transistors but not getting a 12v at the dpdt relay needed to switch it on. A voltage regulator has the right input 14 to 3ov an 12v output rated value. Can't find a schematic or service manual online and I can't figure out why am not getting the 12v needed to switch the relay on. Your kind suggested fix are welcome. Thank you

author: coromonadalix
author_rank: Super Contributor
timestamp: February 26, 2023, 02:47:57 pm
content: Welcome herePlease dont write in capital letter, it can be considered as yelling in some forums or hereNot sure, but they do ressemble some Bryston amplifiers ?? never heard of this brand, and could be a copy of another brandcheck pcb markings / names etc ...
Glitchy 40" monitor - intermittent LCD low/columns/data connection: how-to-fix? - Page 1
Forum section: electronics / repair

author: Odd
author_rank: Regular Contributor
timestamp: February 16, 2023, 08:17:05 pm
content: This is a Philips BDM4037UW/27Video:https://drive.google.com/file/d/19rhjq7ZSA0dqiuaFaVABlxAGPS-1m_ih/view?usp=sharingFirst part is before disassembly. (mostly thin lines)I touched/pressed along the edges of the display, at some point it just worked perfectly.The I assembled it ...and the second part (filmed in landscape mode) is the result.What would be the recommended way of fixing it? - or should I just throw it away?

author: cantata.tech
author_rank: Regular Contributor
timestamp: February 16, 2023, 10:48:50 pm
content: Clean the connectors with some electronics spray that also has conductive lube in it.

author: Odd
author_rank: Regular Contributor
timestamp: February 19, 2023, 09:11:33 pm
content: really ..connectors? that's pretty far from what I would suspect. How sure are you about this?
Glo E teddy lighting circuit 4.5VDC - Page 1
Forum section: electronics / repair

author: neoneo
author_rank: Newbie
timestamp: January 16, 2024, 02:27:45 am
content: Hi legendsWould anyone know where to get a replacement PCB ?It's a 3 colour selection, 4.5VDC, dimming circuit for my daughter's old Glow teddyIt'd be awesome to bring it back to lifeCan't seem to get the negative to switch onto the LED circuitsPCB 2A15-003-0055Thanks so much for any advice
Global Specialties PB203A - Page 1
Forum section: electronics / repair

author: Avinunca
author_rank: Newbie
timestamp: February 19, 2023, 09:30:55 pm
content: I bought a powered breadboard from the USA hoping it would have a split primary so I could convert it to run on UK mains.My gamble didn't pay off and I didn't realise a transformer with 15v 15v and 9V outputs would be hard to find.Question to UK based folk - can I get a transformer made here - I know it's possible but no idea of the cost for a one off.Has anyone got such a transformer for sale with enough VA to give me after regulation 2 x 15v @ 500mA and 5V @ 1ASqueezing separate ones in to the space for the 15,15v and the 9V looks too tight.I did send an email to Global Specialties but didn't hear back.Last resort is to use a smps but would prefer not to.The breadboard wasn't such a bargain after paying £50 postage but still much cheaper than buying a new one here though the fact it doesn't work here is a slight disadvantage!

author: Whitefoot
author_rank: Contributor
timestamp: February 20, 2023, 03:07:04 pm
content: It might be simplest to get an outboard 120 to 240V transformer.

author: DavidKo
author_rank: Frequent Contributor
timestamp: February 21, 2023, 12:43:07 pm
content: Same ideas as Whitefoot. It can be auto transformer. When you buy one with more outputs, than it can be used for different voltages like 100, 110 or 200V. It is simpler, smaller and cheaper than transformer with same power rating.If you have some transformer with split primary for voltage you need, that can handle your current, you can use it instead of autotransformer simply by using primary only.

author: Avinunca
author_rank: Newbie
timestamp: February 22, 2023, 05:04:24 pm
content: I found a used Smart 2 step down transformer unit and fitted a three core mains plug on the breadboard in place of the two pin plug.I find it strange how anything with a metal case could have been wired lacking a protective earth.

author: tooki
author_rank: Super Contributor
timestamp: February 23, 2023, 10:19:18 am
content: Are you sure it’s genuine??On the Global Specialties website, it is shown as having a 3-pin IEC input and a voltage selector switch:https://www.globalspecialties.com/product/PB-203AWhat is odd, though, is that the manual lists only 115V input. Maybe they have different versions?(FYI, it is common to have metal housings and no ground. It just requires all hazardous voltages to be double-insulated. It’s common on consumer AV gear.)

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 23, 2023, 01:33:36 pm
content: Quote from: tooki on February 23, 2023, 10:19:18 amI think this model is quite old and has gone through several revisions over the years. I've got a very similar board from the same company (same size and probably the same model number, can't remember offhand) and I think it's from the 1990's... Mine has an attached power cord and no voltage selection and looks very much like this one I found on eBay but the framework is all black painted on mine...
glue for pcb pads - Page 1
Forum section: electronics / repair

author: ME
author_rank: Frequent Contributor
timestamp: May 09, 2025, 09:53:49 pm
content: I see a few vids of pcb track and pad repairs but all seem to use new pads but just use the component to hold them down when soldered onto , is there any way to stick them onto a pcb ie a special glue?.

author: thm_w
author_rank: Super Contributor
timestamp: May 10, 2025, 01:01:40 am
content: You can use epoxy if you want to do that, but its not common as it takes a long time to cure.If its for track repair you can just put soldermask on top and cure that.This isn't the greatest example but shows some, you can find many videos:

author: benj38
author_rank: Frequent Contributor
timestamp: May 10, 2025, 05:50:40 pm
content: Loctite Hysol 0151 Epoxy is commonly used to repair circuit boards, and I can attest that it performs well.

author: MathWizard
author_rank: Super Contributor
timestamp: May 12, 2025, 12:12:28 pm
content: How long do any of these compounds last in the container ? I need something like that epoxy too, and it's more cost effective to get a lifetime supply bottle, but I don't want it to go to waste, like my little bottles of superglue.

author: benj38
author_rank: Frequent Contributor
timestamp: May 12, 2025, 08:51:19 pm
content: Even though the official shelf life of the Hysol 0151 is only one year (if my memory serves me well), I have used some that was about 10 years old and it was still OK.

author: thm_w
author_rank: Super Contributor
timestamp: May 12, 2025, 10:25:07 pm
content: $20 for a cartridge, I would consider that:https://www.tequipment.net/Loctite/398454/Adhesives-and-Glue/Easier to deal with than individual tubes.Superglue if you get a decent recappable bottle, and keep upright, it should last a while. If you aren't able just get the small tubes.
Glue for rubberdome of flat keyboard - Page 1
Forum section: electronics / repair

author: maelh
author_rank: Regular Contributor
timestamp: May 30, 2022, 07:09:55 pm
content: Hi,I have a keyboard with individual rubberdome switches. Each of them glued individually. A few got loose and I want to glue them again. So far I used superglue, but it isn't ideal, as it's a bit brittle or too stiff.What is the glue that is usually used for fixating rubberdomes? Ideally one that can be removed again once dried if corrections are necessary (e.g., if the key doesnt lower nicely).Does anybody know the "official" type of glue used for rubberdomes?

author: richnormand
author_rank: Unknown
timestamp: May 30, 2022, 10:50:17 pm
content: In similar situations with a remote and a keyboard key I ended up using GE transparent silicone rtv. Been holding for several years and easy to remove if needed.Just need to be careful with surface prep and use a toothpick to apply.Also worked well for speaker dust cap in the center.

author: MathWizard
author_rank: Super Contributor
timestamp: May 31, 2022, 08:00:11 am
content: I wish mine were glued, what a mess sometimes when I go to replace the cord time after time. And for the past few days, my top numbers aren't working besides 56, after putting this KB back together this time.