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.
512
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Copper wires is it safe to use when there is dried on food on it [closed]
I didn't screw the base on the blender cup tightly smoothie spilled into the blender. I took the blender apart and cleaned it up. There is two types of wire on the motor. One is copper and the other ...
0
votes
1
answer
40
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USB-c replacement [closed]
I purchased some used parts for a switch such as this motherboard. I’m assuming this board is not fixable.
3
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2
answers
366
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What is the role of an MKP capacitor in the input of this SMPS? What happens if I remove it?
I'm trying to repair this SMPS board. It converts 220VAC into 15VDC. The circuit is based on KA5L0380R power switch.
The input 1A subminiature fuse of the circuit is blown. To find other broken ...
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1
vote
1
answer
20
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Help IDing a high-power IC - OODOW 836 T57
I'm fault finding for a Korg M50 Synthesizer.
Symptoms: on every boot a message appears saying the device is updating the left/right control panel firmware, after which it requests a re-boot. ...
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3
votes
3
answers
124
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Fixing an 0.5 mm pitch, 18-pin FPC tear
I accidentally tore my Lego EV3's LCD FPC (Flexible Printed Circuit) while opening it.
The FPC is a 1.0mm 18-pin-pitch FPC which near the end is converted to a 0.5mm one.
I found this post in the ...
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2
votes
1
answer
42
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Please identify this burnt SMD component in this LED driver PCB
This is an LED driver labeled as ED-SC 50W1200 (on the plastic housing) and no data is written on the back side of the PCB.
The other side of the PCB is immersed in a black resin that is now locked as ...
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votes
1
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33
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What kind of pins are used on the end of a force sensitive resistor strip? How can I fix a strip with broken pins?
I have two force sensitive resistor strips from Sparkfun where the pins have been damaged.
(One of the pins melted off when I heated it up too much with a soldering iron. The other got ripped out by ...
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1
vote
1
answer
51
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Reflashing firmware for preventive purposes
This is a relatively common malfunction for the installed firmware in some old electrical devices to become corrupted. I often see this in repair videos, and there's often an easy fix - reflash the ...
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0
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36
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Fine-Tuning a Circuit After changing VCA (SSM2641 to SSI2164)
A friend's accident led to a fried SSM2641 VCA in an Eurorack audio module. Determined to give it a new lease on life, I'm diving in, though VCAs are not my forte.
After searching for hours, it seems ...
0
votes
1
answer
63
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How to make a meanwell psu voltage drop? [closed]
I need to buy a 30 Volt 4 amp power supply. I used Meanwell with code number RSP-150-27 before (We set it to 30 volts with trimpot).
However, Türkiye is out of stock and there are problems with the ...
1
vote
1
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123
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Can I replace a battery with a higher capacity one?
I have a pair of Sony WF-1000XM3 and after three years the batteries in them have significantly degraded.
The guides online suggest to get the following Battery:
...
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1
vote
1
answer
140
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Color Code for Fusible or Flame Retardant Resistors: Data Sheets, Standards?
In the context of the repair of European audio and video gear, made by companies like Grundig or Philips, I come across "safety" resistors every once in a while, i.e. flameproof or fusible ...
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1
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31
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Using a Larger MFD Capacitor with a UV Lamp Ballast
I am attempting to repair a UV lamp for curing resins and epoxies. I determined the capacitor was the problem and ordered a replacement (7C100M33R). I got the last one the site had available - and ...
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1
vote
1
answer
68
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Tektronix 453 - Time/Div dial has no effect
I recently picked up a Tektronix 453 Oscilloscope and it works pretty much flawlessly, but turning the time/div dial (the clear plastic flange) does nothing to the display. I tried hooking up CH 1 and ...
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0
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55
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Which of the modern transistors could be a substitute for 2N709?
I need to replace the damaged Q1 transistor, but I don't have a 2N709. I was thinking about 2N2222 because of the similar case type. However, this transistor differs in frequency. In this follower ...
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0
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Does measuring voltage drops between the EBC terminals guarantee the functionality or non-functionality of a BJT?
Do voltage drops across the terminals of a bipolar transistor, which fall within the catalog data, guarantee that such a transistor is working properly?
I am in the process of repairing and restoring ...
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1
answer
120
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Can an 18.7 Ω resistance between Vcc and GND cause an increase in current?
This is an ECU PCB and the measurement of resistance between Vcc and GND for the TC1762 Tricore MCU in the PCB is 18.7 Ω.
I have a reference board, the resistance there is 400 Ω between Vcc and GND ...
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1
answer
144
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Battery got spicy pillow on a doorbell device, can I replace it with a capacitor?
I have Amcrest AD410 doorbell camera, I noticed the bottom of the device is open/cracked, when I investigated inside, I noticed the battery is swollen/spicy pillow, I couldn't find replacement for the ...
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0
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70
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Repairing Damaged Via & Pad
I have damaged a via and the pads that sit on top of that through-hole. Looking at the underside of the PCB, I believe I could just add a single copper wire on the underside and connect it to D69, ...
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3
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3
answers
394
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How to remove glued IC chip from PCB?
I used rework station hot air to 360 degrees Celsius for 3 minutes and the IC didn't come off! I hope I didn't damage it for prolonged heat exposure. Then I found out the IC is glued, I couldn't find ...
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0
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Tektronix DPO 3052 encoder repair
Two encoders are showing similar behavior as shown here.
But I do not have spare encoders. I have fond this on the ebay.
The part number is 260-2791-00. Edit: no, it is part number with detents, the ...
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1
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37
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MPPT charger - where to learn more [closed]
I would like to learn more about the design of MPPT chargers so that I can repair them.
I can repair various electronics (e.g. SMPS, chargers, cell phones, etc.) but not MPPT chargers yet. Where can I ...
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2
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Help me identify this capacitor to fix my monitor
My monitor ( Samsung C32HG70 ) is having a common issue about 2 years in with horizontal/vertical line issues.
I've narrowed it down to this capacitor that I can tap on a bit and the back to normal ...
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1
vote
2
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112
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How can you tighten a potentiometer? [closed]
I have an arcade cabinet with a broken volume control daughterboard. Soldered in is a potentiometer which turns clockwise/anticlockwise fine, but also lifts 1mm off the board. It works as intended ...
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2
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112
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Found some SMD capacitor leakage, can I sand them to clean the PCB?
After removing the 3 electrolytic smd capacitors from a car ECU, I found some leakage, although not sure if this is the main culprit of the problem in my ECU, but I'd like to clean them. I tried 99% ...
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1
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48
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Need help to identify a component - switch
I recently bought a (Power Rangers SPD) Dekaranger Morpher for my kid (Japanese version of a Power Rangers toy) and 2 of the switches on the board are damaged.
I know I can buy something similar and ...
0
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1
answer
102
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What is the black stuff on the PCB below remote control buttons?
The picture:-
You can see the pads with labels like "K7", "K8", "K9" e.t.c. So two related questions are:-
What is the black stuff (it's loosely conductive)?
Can I ...
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3
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Need help with fixing JVC AX-311 amplifier
Electronics repair noobie here. I have tried to find the answer myself, but would like some assurance on this problem.
The left channel of my JVC AX-311 amplifier is unstable, it sometimes works, and ...
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1
answer
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Connector identification - Xbox series X
I am trying to repair an Xbox Series X after a liquid damage and I found a short in the B2B connector. I need to replace it but after lots a research, I can't find the reference online.
Here it the ...
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0
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48
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Television repair - connectors and standards for display panel and controller boards
All my experience comes from 2 flat TVs, so my knowledge is quite reduced and questions have to be quite broad.
Questions:
Are there standards or common practices from manufactures about connections ...
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1
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Capacitor mounting in switched power supply
I'm repairing switched power supply. It is custom inside device and cannot be changed with another power supply. It is not first time I've had to repair it. The problem is always the same: grilled ...
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vote
1
answer
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Capacitor on a PC mainboard: Identical vs generic replacement
I am going to replace the capacitor on this mainboard (see here) soon. I know that the original capacitor is a NICHICON (270UF/16V 8*11.5-12K-B). However, it is not that easy to find exactly that ...
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Help me identify and run this motor
I've found a non-functional orbital shaker made by Stovall. When plugged in the power LED turns on , but the motor doesn't run. I thought I'd open the case and try to figure out what went wrong.
There ...
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1
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48
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Repair electronic board of food dryer [closed]
I recently bought a used food dryer. The heater would not turn on, everything else seems to be working fine. I took it apart to investigate.
I found a burned resistor in the path between the bt139 ...
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Circuit for swinging pendulum on clock
I have a large (30”) statue that holds a clock that swings. The pendulum has a small circuit that is powered by a 1.5 V C battery. It stopped swinging even with a new battery.
The circuit has two ...
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vote
1
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Causes of parasitic oscillation in voltage amp with AN7062 IC
I'm having difficulty identifying the cause of parasitic oscillation that manifests at the output of this amplifier circuit, based on now-obsolete AN7062N. For context, this is the first amp level ...
1
vote
2
answers
91
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Pinout on legacy audio jack
The headphone jack on my old (= 20th century) Daewoo TV 20A5 is broken -- the tip of a plug is stuck inside. As the TV itself is working fine, I would like to replace the jack, or rather jerry-rig a ...
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4
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2
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196
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Rookie needing help identifying components
I'm trying to repair a power supply that someone cooked by running on UK mains with a travel adapter rather than a stepdown transformer.
I've found an area of clearly burnt components that I want to ...
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4
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0
answers
116
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CD player playing digital noise on a track full of silence
I'm trying to repair a Nakamichi CD Player 3 that I got recently. Service manual from ElektroTanya
Relevant section of the schematic:
Initially, it would not open and just show an error. Replacing ...
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2
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0
answers
115
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Why were these mods done?
I have a "Quantum Data 882E-HDMI Video Generator" in for repair. It has a fault or two, but also has number of mods which I would help with.
Questions regarding board "84-00221 Rev B/99-...
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4
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1k
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Replacing broken pins/legs on a DIP IC package
An absolute beginner at this, so forgive me. Took an intro to EE class last year wherein we learned how to use op amps.
EE store had a bunch of free surplus LM348Ns and 741s that I collected for a ...
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2
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Identifying a keyboard component
Recently I found an old ACER 6312-TA keyboard that I want to repair. Everything seems to work fine except for this component that I can't identify:
I bet the reason this keyboard is not working has ...
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1
answer
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Help identifying a small (1.6 x 1.2) IC on the output of a buck converter
I've done some looking but haven't been able to find a component that quite matches this one. It's on the output of a switching converter. The only markings on it are AG followed by a sideways F. The ...
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2
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171
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Repairing torn-off pad on an SMD component
I've seen several similar topics where people have torn off PCB pads, but in my case, I managed to tear off a pad from an SMD component (a sealed pressure sensor). It was one of the communication (I2C)...
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vote
2
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88
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Which glue isn't detrimental to laptop electronics
Over time, I lost all four rubber feet that were under my laptop (Asus UX530U) and I want to replace them. The original ones used to stick to the laptop by having a little rubber pin plugged into the ...
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2
answers
68
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Possible degree of damage to PSU
The following PSU accidentally got 400 V instead of 230 V at J6. There is a fuse built into the power switch, which is connected to J6. The fuse blew on the original incident. Trying to replace the ...
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1
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Can the DC offset on a line input trigger power amplifier shutdown?
I am looking at a Kenwood HiFi receiver (KR V5090) from the late 90s that sometimes loses sound on one channel.
Granted, it can just be replaced, but I always like to give devices a second chance by ...
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3
votes
2
answers
202
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Removing 3.5 mm jack socket from a PCB: patching the socket's switches
I sheared off a plug from a 3.5 mm headphone jack inside my Roland HP603 piano. After failing to remove the plug, I tried removing the 3.5 mm jack socket from the PCB.
However, the piano still thinks ...
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votes
4
answers
2k
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Sign of failure of potentiometer
Is it a sign of failure of a potentiometer when it doesn't have a fixed ohm value (the MM reading keeps changing) at any turn position, and what must be done to fix this particular symptom?
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128
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Wheres does this PCB trace go?
I am checking a damaged engine ECU. Two traces were damaged during opening of the ECU.
I put a circle around the damaged traces. I need help with the left trace. Where does it connect to?
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