Skip to main content

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.

Filter by
Sorted by
Tagged with
0 votes
1 answer
47 views

Help identify this SOT-23 5 pin component labeled ADU06 and weird behavior

I'm new to fixing circuits and I'm trying to figure out why this board will not boot. I've traced the Vcc on the MCU (H8/38024) to this circuit. I'm guessing that it is a linear regulator, but when I ...
chefweil's user avatar
0 votes
1 answer
36 views

Solenoid coil repairing [closed]

My change over JQX-62F-2Z relay coil burns. So I want to repair the coil. Please guide me about wire gauge and turns to repair my relay coil.
muhammad zahid's user avatar
0 votes
0 answers
51 views

Options after breaking USB-C jack off of PCB

Hello! Snapped the USB-C jack off of my Logitech MX Keys. I have a background in computer engineering and some experience doing board-level repairs. I do have an SMD hotplate, multiple soldering ...
Mikey's user avatar
  • 1
1 vote
0 answers
37 views

Replaced MOSFET in BLDC driver keeps blowing [closed]

I have a motor and controller which, after a catastrophic fault destroyed one of the phase coils and the high and low side MOSFETs for the affected phase, I've repaired by rewinding the coil and ...
R.. GitHub STOP HELPING ICE's user avatar
5 votes
0 answers
113 views

What's wrong with my bread maker?

I'm not sure if that's a place I can ask this question. I've got a 10 years old bread maker, that I've used about 50 times. 2 weeks ago, upon turning it on, everything looked and sounded usual (screen ...
user1532080's user avatar
0 votes
1 answer
77 views

Yokogawa WT3000 don't boot

I have a Yokogawa WT3000 Power Analyzer which I was using with no problems and then I turned it off to take a break. An hour later, I tried to turn it on and I notice that it shows nothing on the ...
Franco Fischer's user avatar
1 vote
0 answers
59 views

MS Surface power supply connector

This is an update to the first question about this connector. I had 3 faulty Microsoft Surface power supplies and I draw a topological circuit diagram for it, to better compare it with the hardware. ...
Armin J.'s user avatar
  • 119
0 votes
1 answer
35 views

Need Information on Vernitron Motor Model 15H4B-AA0-A2

I’m looking for a Vernitron Corporation motor, specifically model 15H4B-AA0-A2. If anyone has a datasheet, or any details about this motor, I would greatly appreciate your help.
Ronald's user avatar
  • 1
1 vote
1 answer
36 views

Identify and substitute f1404zs

I need help understanding which chip I need to buy. First, I hope this is the correct community; if not, I apologize. My intention is to repair a Mark Levinson 86280-0w690 audio amplifier, inside ...
user_0's user avatar
  • 113
2 votes
3 answers
523 views

Are these bodges equivalent to the traces they fix despite bypassing vias also connected to the traces?

Given these broken traces underneath two ICs: For the broken traces that run pad-via-pad, is it OK to bodge on top of the pins of the ICs like this, even though this "bypasses" the vias? I'...
Mars's user avatar
  • 23
0 votes
0 answers
56 views

Wifi LED Smart Bulb

I'm trying to use my smart wifi bulb ESP8266 as a wireless controller for RGB LED. Currently it's a 9 W bulb works from 220 V AC. My question is, if I disassemble the ESP8266 board from it and use it ...
BMS's user avatar
  • 1
1 vote
3 answers
157 views

Cleaning excess solder from small through-holes on a PCB

I am trying to desolder a micro connector, and one of the through-holes where the connector legs are soldered is so small that I cannot remove the excess solder. I have tried using flux, adding new ...
condor12's user avatar
  • 145
10 votes
4 answers
2k views

How do I de-solder cheap proto boards without pulling pads off?

The title kind of says it all. I've been buying these prototyping/breakout boards and they come with a bunch pin headers that I don't want to be there because I want to mount them in my own way. Every ...
ipmcc's user avatar
  • 231
0 votes
1 answer
31 views

230V 3-Phase Power Supply for VFD and PSU Repair

I am repairing CNC electronics and need some lab equipment. I need a 3-phase, 230 V input for the power supply and VFD to debug them. Where should I look to get a supply for this? Is there something I ...
Ishmael's user avatar
  • 11
0 votes
1 answer
36 views

Locating the temp sensor on motor controller

I am helping my neighbor with fixing his out of warranty EV UTV. I have narrowed it down to a faulty temp sensor. -Controller: Curtis 1234SE 72vdc 3Ph VFD. Fault code:15. What would a label next to it ...
ClintG's user avatar
  • 1
0 votes
1 answer
55 views

Fixing TFT flexible pcb [closed]

I have damaged the flexible/ribon pcb on my display (as shown in the pictures below). I was thinking about soldering it, but the traces are tiny. Replacement isn’t possible. What do you guys think i ...
Vid's user avatar
  • 21
2 votes
4 answers
902 views

I obliterated a ceramic SMD, how to find out what piece it is?

this is from a laser GRBL generic from China, 12v and 5v. The neighbor SMD appears identical to the one that was cracked. The multimeter measured 1.0 mega and milliohms, I couldn't get a reading. Do ...
bandybabboon's user avatar
0 votes
1 answer
114 views

What is this shorted diode from a Bosch BMS for an eBike?

I am currently trying to repair a Bosch BMS from an ebike and found a shorted diode so far. I can't figure out what exact model the diode is can anybody help me to identify it?
Bobtimus's user avatar
0 votes
1 answer
75 views

Why does my monitor back side become energized after CCFL to LED repair?

I am repairing my old monitor Samsung syncmaster 740b from not working CCFL lamps to LED lights with a led driver. I just had a first test. I have got electricity hit, investigation shown my metal ...
Gleichmut's user avatar
  • 131
1 vote
1 answer
132 views

Solder pads ripped - charging via test pads?

My uncle asked me to repair a tablet but when I opened the tablet I saw that the micro USB connector was completly ripped off the board and I lack the tools to scrape free some of the copper to solder ...
Olaf Olaf's user avatar
0 votes
1 answer
43 views

SMD component on a dotmatrix printer driver board

This SMD (code: 327G) is mostly used between data lines from the microprocessor and (possibly) some solenoids of a dot matrix printer. So it should be some switching device. I redraw related part of ...
kemal's user avatar
  • 95
0 votes
0 answers
109 views

Power supply voltage drop with load

I'm trying to fix a old soviet power supply and I think it is a switched-mode power supply. When I plug it into the wall it makes a high pitched sound around every one second. The output voltages are ...
SierraWD's user avatar
1 vote
2 answers
81 views

help to identify the component

I don't understand what component it is (0k=g9w), and it needs to be replaced. I've done various searches, but I can't figure it out. This is a motherboard from an Asus computer.
Jhon M.'s user avatar
  • 11
1 vote
1 answer
73 views

How to Test Battery Health in GRUNDIG VCP 3930 with a Multimeter, Arduino, or Raspberry Pi?

As a follow-up to this question, I own a GRUNDIG VCP 3930 vacuum cleaner (which uses a 25.2V, 2000mAh Li-ion battery) that has stopped charging properly. I am being told that the battery on this ...
Foad's user avatar
  • 233
1 vote
1 answer
75 views

Heat pump dryer circuit board issue

My heat pump clothes dryer recently stopped condensing altogether. The drum still gets hot, but no water is being drawn out of the clothes, suggesting the condenser is not getting cold enough to ...
Daniel 's user avatar
1 vote
2 answers
120 views

Can I safely remove this buzzer from a UPS PCB?

I want to remove this buzzer from this UPS PCB. It's very noisy. For the UPS to continue working, should I just remove the buzzer with a soldering iron? or do I have to put some wire or resistance in-...
topcat's user avatar
  • 13
2 votes
1 answer
156 views

Help me identify the blown part, SMD, 5-pin "5AH10"

Pic 1 (the ic): Pic 2 (the ic): Pic 3 (the ic): Pic 4 (the hub board): Pic 5 (back side of the hub ic right above the big ribbon cable female connector): This IC is found in the USB hub of the HP ...
AhmedH2O's user avatar
  • 360
1 vote
2 answers
79 views

Have I replaced the power supply in this radio safely?

Preface: I know little about electrical engineering, I mostly used a multimeter to diagnose and measure and to make sure I made nothing obvious wrong. But I know nothing about circuits, reading ...
Lennart's user avatar
  • 113
0 votes
1 answer
158 views

Column of keyboard keys not working

So every key that is on this trace is not working. Is C25 the culprit? It is a mechanical keyboard and there is continuity between all of the keys on the trace, and they all go to this jumbled mess of ...
user318422's user avatar
0 votes
1 answer
61 views

Step-down circuitry

I have a water-filter board that receives 36V input, and needs to power an ESP-WROOM-02D in 3.3V. The power circuit that converts from the 36V to 3.3V is no longer working, and I am trying to ...
Mathieu Legrand's user avatar
1 vote
2 answers
82 views

Help identifying a component from a barcode scanner

I have a broken Honeywell model 1902 barcode scanner that I want to repair. It is the component labelled "6409" as shown in the photo: .
Rodney Julius's user avatar
2 votes
1 answer
149 views

Multimeter resistance measure repair

I have ancient multimeter, recently the resistance range shows very incorrect values (or nothing). I have schematics and started to analyze, but can not identify how the resistance measure works. ...
Peter Novotny's user avatar
2 votes
1 answer
542 views

Better to use low ESR or high ESR caps?

I'm replacing the old filter capacitors on Marshall guitar amp and I was wondering if I should use low/non-low ESR caps for this. As my understanding is (which is neither deep nor correct probably) ...
steve d.'s user avatar
  • 175
1 vote
1 answer
92 views

Diagnosing Issue in Bench Power Supply with Buggy Display

I have a BK Precision 1660 Power Supply with a buggy display. The system has two displays (master and slave), the slave display working perfectly fine while the master display will sometimes flash ...
mm3psych0sis's user avatar
1 vote
1 answer
126 views

Microwave oven control board not working [closed]

I am attaching two pictures of the control board. Can someone explain why the positive output from transformer is going to ground while negative output is going to the voltage regulator. The negative ...
Muhammad Waqas Hafeez's user avatar
0 votes
1 answer
105 views

Repairing toy firetruck [closed]

I am trying to repair this simple toy firetruck with a button, a speaker, a motor and some lights. First the sound stopped working, and now there is no light or motion either. All the wire ...
Vegard's user avatar
  • 61
0 votes
1 answer
187 views

Vertical wobble and flicker on analog oscilloscope

I'm using an old analog oscilloscope (Metrix ITT instruments OX 725). (I don't have a printed manual for it, but you can find scans of a French user's manual and service manual (with circuit diagrams) ...
Fii's user avatar
  • 135
0 votes
1 answer
63 views

Debugging an automotive FM transmitter

Transmitter is a 12V automotive audio-to-FM transmitter unit. Belkin Tunecast F8M066. Receives both power and audio fine over the cables into the unit as measured on the board. 7.6 MHz crystal is ...
Reinderien's user avatar
  • 3,229
1 vote
2 answers
135 views

Will this work if I'm using an anti-static wrist strap when repairing a laptop?

I was thinking that I would connect it to the ground terminal of the outlet (I live in India so it's the top one) but I'm scared of getting shocked because of a faulty ground point etc. So I was ...
Siraj's user avatar
  • 11
3 votes
2 answers
503 views

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 ...
Meysam's user avatar
  • 73
1 vote
1 answer
29 views

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. ...
aaronsnoswell's user avatar
3 votes
3 answers
328 views

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 ...
pythoncat's user avatar
2 votes
1 answer
112 views

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 ...
Unicornist's user avatar
0 votes
1 answer
49 views

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 ...
ndbroadbent's user avatar
0 votes
0 answers
22 views

Repair of Philips MCM778 / ought the resistor be changed?

Upon powering on Philips MCM778 transceiver a signaling sound indicated possible lighting up of fuse. Can anyone advise whether the fuse had burnt and R2 resistor burnt? Should I intend to replace R2 (...
gzifl-67's user avatar
1 vote
1 answer
149 views

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 ...
NSp's user avatar
  • 11
0 votes
0 answers
75 views

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 ...
flower.fish's user avatar
0 votes
1 answer
65 views

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 ...
Yeni_Kullanici's user avatar
1 vote
1 answer
1k views

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: ...
Lukas Knuth's user avatar
1 vote
1 answer
2k views

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 ...
zebonaut's user avatar
  • 18.4k

1
2 3 4 5
11