Questions tagged [repair]

Questions relating to electrical/electronic repair. Questions on the repair of consumer electronics, appliances, or other devices must involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired. Please ensure your questions are somewhat generic in nature so they are likely to help future visitors and not too localized to a specific piece of equipment.

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Monitor with Garbled Output During Cold Boot [closed]

For the longest time, I used this monitor (Asus VW266) as my primary display. However, recently this started happening as the display started up (from a being off during the night, or for longer than ...
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Tips to replace and soldering the battery connector in pcb

Tips to replace the asus rog gl703 8 pin battery connector, I think using a soldering station that shields nearby circuits with kapton tape and tin paste is a good idea to start with, the board still ...
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Battery connector name 8 pin pcb

I hope you can help me. I was cleaning my laptop, it's an asus rog gl703 (I'm a programmer) changing thermal paste, etc. and I had a big problem, the battery connector broke without realizing it. ...
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1 vote
1 answer
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A component has blown on my HP elite book 840 G6. I need help identifying it if it all possible

Here are the pictures. It was late and I shorted 2 pins of the smart card reader ribbon connector. Don't know how such a stupid mistake, but this component on the other side of the board went up and ...
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help identifying laptop connector (For Repair)

I was trying to repair my laptop's keyboard because some of the keys don't work anymore. but in the proces of removing the boards i broke the male end of the power connector on the pcb. (the plastic ...
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1 vote
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Portable Speaker Repair - Possible Battery Issue?

I'm trying to diagnose why a portable, Bluetooth speaker (Otone Blufiniti) won't power on. I think the issue is the battery and could do with some help please. So far, to diagnose the issue, I've: ...
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Trying to fix a possible non-removable permanent fuse

I'm having some issues with a PCB in an alarm unit. I think the unit shorted. I'm now trying to identify the broken component to replace it. The board is mains powered, but also has a battery - ...
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8 votes
1 answer
856 views

Restoring and operating a temperature gauge from the Soviet space shuttle Buran

After the Soviet Buran (БУРАН) program was suspended in the late 1980s, the Buran space shuttle was housed in a hangar at Baikonur. That hanger unfortunately collapsed due to structural failure in ...
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1 answer
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Fried diode - need help buying replacement

Full disclosure, I'm not an electrician by any means. My dad was an electrician in the Navy, but we lost him last year. Since I don't have him to look to anymore, I'm hoping I can find some help here. ...
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2 answers
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How to repair a broken 2.4 GHz remote control? [closed]

I have bought a Remote Control Drifter Stunt Car (Z109S). Unfortunately, part of the remote control has been broken. I tried to solder the broken path but still not works. Is there any specification ...
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2 votes
1 answer
108 views

CMOS coin battery drained out in 5min even without the BIOS IC

I have a high-end motherboard (Asus WS Z390 Pro) out of warranty. My bios looses its settings everytime cut-off the power. I found out something is draining the battery way too fast. I decided to ...
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Knocked off a diode during a display motherboard repair, not sure what it does or what it is or does. Please help

I have an LG ultrafine 5K 27MD5KA-B. The USB-C port became loose inside so I went to repair it. Long story short, that repair requires hot air and I accidentally blew a diode off the board. See images....
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Ceramic capacitor blow out [closed]

I run a SOHO system. Yesterday, a major fault caused my system to stop working. General inspection of the motherboard revealed nothing. Test bedding the board produced a flare in one of the ...
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0 votes
2 answers
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How to go about repairing a ripped solder pad on a USB flash drive?

I have a flash drive that sustained damaged the USB port. It looked like it just needed to be reseated with fresh solder and some TLC so I went ahead and started to remove the damaged port and then ...
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5 votes
5 answers
2k views

Is forcing power through a faulting board a good diagnostic tool?

I was researching how to diagnose what SMD was shorting on a laptops motherboard when I found an unusual diagnostic test. The video I came across showed a tech using a variable power supply to force a ...
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15 votes
4 answers
4k views

PCB Crack Repair

When replacing a component on my DJM450 (DJ Mixer) I stupidly cracked a small part of the PCB. Now, in terms of effect for me, it's minimal but very annoying. I want to repair it, if possible. Every ...
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Stereo amplifier producing hum on certain conditions. How to troubleshoot/repair?

I recently acquired a stereo amplifier, Pioneer brand, A-303 model. Upon testing it, i noticed it produces an audible speaker hum (at about 100hz) whenever the bass and balance knobs are turned. I'm ...
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Mains transformer replacement for Denon PMA-320

I am servicing a Pioneer Audio amplifier (PMA-320) which sadly has an open primary winding in the mains transformer. As you may know, original replacements are unobtainium therefore, I am planning to ...
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0 votes
2 answers
72 views

Keyboard Repair: Both Shift Keys Dead [closed]

I have an old notebook working perfectly fine. The only issue is that both shift keys are completely dead: keyboard top view keyboard bottom view ...
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1 vote
1 answer
91 views

Part identification / replacement: RF PA

Story I recently aquired (second-hand) a Yaesu FT-252 handheld in unknown condition. It turned out to mostly work, but was found very weak. Investigating it in the HAM club we found that the PA IC is ...
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4 votes
1 answer
481 views

How to fix overly sensitive switch

The switches in the presenter (clicker) depicted below normally close when firmly pressed, by giving way and making contact with a positive feeling and sound. However, the bottom-right switch appears ...
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2 votes
3 answers
186 views

Identify vintage capacitor

What is this component? Words on it say something like: DUIULER 0.1 ? +- 23% 250V 50~ WKG TL Where the "?" is a literal blob of ink that could be ...
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-3 votes
0 answers
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Can I fix my fried notebook? [closed]

so I'm feeling sad today, as I fried my notebook. I took apart a SATA to USB device and soldered a connector to the 12v line, so I could use full sized HDDs with my USB adapter. I have already tested ...
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1 vote
1 answer
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Small motor seized

Alright I'm trying to get my pellet grill up and running prior to Thanksgiving and I seem to have a seized motor. The past few days I was working on clearing a pellet clog in the middle of the auger ...
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0 votes
1 answer
72 views

Old computer socket disconnection, cleaning, and repair [closed]

I have very old computers; from time to time the RAM disconnects. I remove the DIMMs, clean the sockets using Isopropyl alcohol many times until it works again. It will be fine for few weeks, but I ...
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1 answer
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Is this LCD monitor matrix damage or is something else wrong? [closed]

The monitor has a vertical line and a part of its screen is not working properly. Can this be fixed by replacing the matrix or is it something else?
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2 votes
1 answer
122 views

Unusual USB keyboard wiring - repair needed

New to anything electrical, and I'm trying to make an urgent fix for my wife's keyboard. She has a disability, so needs a specific keyboard to work, and the USB plug on the keyboard has been damaged ...
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-4 votes
1 answer
83 views

I accidentally poured Coca-Cola on my computer and it's the only one I have for studying [closed]

To solve this, I tried to dry it, and it kinda works. My PC get turned on but after that it began to turn off suddenly and the mouse is moving without any movement from me. How can I solve this ...
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0 votes
2 answers
70 views

SMPS blown after wrong mains voltage [closed]

I have one of those 24V/15A SMPS with a switch to select the input voltage (110/220V). It was connected to 220V while the 110V was selected and now it is obviously not working. I opened it and, apart ...
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Shorted BIAS on AVR Receiver

I have a Denon x1200w and had the red blinking light of death. Took it apart, found one of the mosfets on the power board bad, replaced it. And all was well. Except the left channel was distorted and ...
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0 votes
1 answer
75 views

Diagnosing dead soldering-iron

My soldering iron was working fine for a few years. One day, I used it and it worked fine again, then I unplugged it then tried to use it again a couple of hours later but it wouldn't heat up. I took ...
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2 answers
73 views

Cylindrical radio component identification

As a complete novice, probably out of my depth, I'm struggling to identify this component. It appears to be a fuse, there is no continuity across it when tested. Dimensions are; 7mm long, 2.5 wide (...
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2 votes
2 answers
161 views

Should there ever be a dead short across where a capacitor goes in a circuit?

I have an old video card that is not working right and creating instabilities in the system it's plugged into. I measured several dead shorts across capacitors in circuit using my multimeter. After ...
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1 answer
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Remove the positive terminal button of an AA battery?

I was thinking of doing a simple repair: replacement of a NiMH AA battery in a device I own, but it uses a battery without any protruding positive terminal (no room to spare). I can't really find any ...
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1 answer
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Stuck Molex Connector (Dead PSU)

I have a very stubborn molex connector on a FF800 board and I am hesitant to use force on it. I have been asking for suggestions to coax the detent out of the socket but have had little success. I ...
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1 vote
1 answer
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Fixing corroded contact surfaces on PCB

Looking at a Seagate HDD that no longer connects. The motor is running, but does not show in devices. The disk has production date is 12361 (2012-03-05). Before having a look inside I checked out the ...
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Confirm resistor and transistor for amp fix

I got the magic smoke on day 2 of using an 80s Yamaha A-500. Thought it was the large electrolytic caps as they'd leaked but on replacing them with Nichicon ones, the smoke continued on powering up ...
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1 vote
2 answers
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Can a fuse (non-resettable) wear out over time?

If a given circuit (containing a fuse) operates perfectly and continuously, will there come a time when the fuse simply stops working due to age and wear (wear from passively passing current ...
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6 answers
280 views

Looking for a replacement rotary encoder, how do I select one? Are they all standard or universal?

I am looking for replacement rotary encoders for my Yamaha A4000 sampler. These samplers have a common problem where the encoders start to work poorly after time. It is Yamaha part number V4441800, ...
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Help regarding identification of a DC-DC ic bearing the print "ER=1B 73H" in a faulty BOE-hm185wx1-400 panel

I am having a faulty BOE-hm185wx1-400 panel, where the MLG voltage has dropped to 15 V instead of the usual 25.4 volts. After a bit of diagnosis, it appears that the DC-DC ic below is possibly faulty. ...
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2 votes
0 answers
98 views

Help to understand the circuit function for me to repair - 30W LED ceiling light

I have a 30W LED ceiling light that has an adjustable LED temperature and is dimmable. It has a center lower power night light. It is controlled via an IR remote. I need advice on how to repair the ...
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2 answers
81 views

THT components reliability and advantages for small scale production [closed]

Examining this question in the "manufacturing of not consumer electronics". I'm looking for an opinion by others about some statements that I take for correct. Are THT components in general ...
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1 vote
0 answers
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Help identifying a 4-lead component for reordering - marked P&V 100487

The following components have the same identification marking and the same properties. as far as I know. The component is part of an diesel electrical generator controller and it connects to the ...
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Help identifying unknown IC in MIDI controller board

I'm trying to fix an Akai MPK mini MK II. The USB connector was busted, and I also found a 6-pin IC that had been yanked out by the connector. The only markings it has is "62 7" though the ...
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1 vote
1 answer
121 views

Help identifying broken component

I have this control board from the charging station of a robot lawnmower. The board broke after a failure with its power supply. The board was powered by a 12v lead-acid battery, with a DC-DC ...
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3 votes
2 answers
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Need some help to understand where to start to repair a router damaged by a faulty 12VDC power supply

I have a router that was powered 24h/24. One day the 12 VDC power block died. I made the mistake to replace it with one I get on aliexpress: The aliexpress power block is rated 3 A but when I get it I ...
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What do I have to look for when replacing a MOSFET with a different model? [duplicate]

We are currently repairing the memory rail of a GPU and because a MOSFET burnt out, we would like to replace it. The issue is, that we only have one that is a similar model, namely we would like to ...
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Understanding RF MOSFET Bias Circuit

A faulty in vehicle DCDC charger has fed 16V or so into a brand new radio and I'm stuck with a non-transmitting transmitter. This particular circuit has multiple amplification stages with two preamps ...
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12 votes
3 answers
1k views

PCB Logic Board Reference Designator "E"

I'm looking for some help identifying what the reference designator 'E' on this Logic board is for. Can these pads be used as test points when trying to find a fault? The board is from a Datamax O'...
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Potentiometer contact surface between carbon track and solder pin lost its conductivity

I have a 10k stereo slide potentiometer with the carbon tracks pretty much intact but one of the short 'traces' that connect the ends of tracks to the solder pins seems to have somehow deteriorated ...
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