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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0answers
29 views

Correct procedure to identify a component and obtain the datasheet

I'm not sure what should be the correct procedure to obtain a component's datasheet starting from the component's package code. I searched in the other questions, but I found mostly people asking ...
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0answers
50 views

Burnt motor soft-start component - how to find a replacement?

Friends of mine handed me their grass trimmer to take a look if it can be repaired. It's powered by 230VAC and contains the following element in series with the motor, which seems to be the culprit: (...
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1answer
69 views

How do I get rid of a black area on my TV? [closed]

I have a large black area on the bottom right of my TV screen. The model is a Samsung UN60KU6270. How do I get rid of it? Do I need to hire someone to fix it?
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1answer
57 views

How to repair solar panels without being able to source an exact replacement diode

How can I repair a solar panel (replace the blocking diodes) without access to the exact same components? I have a 100 watt 20volt semi-flexible solar panel marked PV-XC502 on the junction box, ...
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2answers
44 views

Changing push-pull transistors in brushless motor driver

I am fixing a brushless motor driver that has 6 MOSFET transistors, 2 transistors for each coil. I have found that SW5 is burned so I changed it and everything now works well. However, I have heard ...
2
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4answers
1k views

How to best clean this sealed mechanical rotary encoder / volume knob?

How can I best clean, replace or lubricate this fairly well sealed digital rotary mechanical encoder? The equipment operates, but the encoder is super finicky, often encoding in the wrong direction ...
0
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1answer
33 views

Replacing Projector Fan - Wiring Color

An old Sony VPL-CX11 stopped working because one of the fans (the lamp's one) was so rusty that couldn't rotate. In the front of the projector there are two fans, one for the lamp and the other for ...
0
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2answers
50 views

VI component tester not working properly when capacitor is placed parallel with diode

I am trying to repair mainboards with VI component tester. (Such as this device and that device.) I check the characteristic VI curves of the components on the card and identify the defective parts ...
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1answer
45 views

Mosfet testing for short from youtube repair video

In the 23:40 of the youtube video https://youtu.be/YQ7SXJqIpzs , the presenter does a p-channel mosfet test for short, using his bench power supply on the circuit. From what i understood, he ...
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1answer
112 views

RIFA PME271M547 replacement

I just broke my sewing machine (it's an old Viktoria machine about 30-40 years old) and now I am looking for a replacement safety capacitor. The one installed is a RIFA PME 271 M 547 paper capacitor. ...
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1answer
101 views

Clean/repair/replace the carbon pill of a rubber keypad

I have several devices (calculators, remote controllers, …) with rubber keypads where some keys are dysfunctioning. As I understand it, this is because of the carbon pill since things work fine if I ...
3
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0answers
58 views

Bluetooth speaker works only when aux is plugged in [closed]

Plot Recently got this Bluetooth/FM speaker with a built-in microphone from my friend to try repairing it. He said that it's battery was swollen up so he dumped the battery and never used the speaker ...
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0answers
74 views

DC permanent magnetic motor control issues

We have a 180 V dc permanent magnet motor. When engaging the control board while the motor is hooked up. The output to motor drops out and reads no voltage. If I take the motor leads off the ...
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3answers
100 views

solder-bridge at ribbon-connector?

I am currently trying to repair a pen-tablet-monitor, which has what i call a 'blind/dead row'. Meaning that i can draw everywhere, but there is this one row, where any input is either picked up by a ...
-1
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1answer
64 views

Subwoofer amplifier IC repair? [closed]

I bought a subwoofer as is. The sub worked, but the speaker terminals didn't. I took a look inside and the amplifier IC(TDA 7265) looks like it shattered somehow. Any ideas what could have ...
12
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1answer
252 views

Troubleshooting a faulty filter circuit in a PAL CRT display

I have an old CRT monitor (Phillips CM8833) which I am attempting to repair. When displaying a composite PAL signal, it only shows a black and white image, but it is still able to display RGB signals ...
2
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3answers
105 views

Soaking phone motherboard in isopropyl to fix potential corrosion

Is it advisable/safe to soak my phone motherboard in an isopropyl alcohol bath? I dismantled it after water damage occurred and it now powers on fine but my cell signal isn't consistent. I was ...
0
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0answers
75 views

Insights required to repair my Agilent YIG oscillator

I know, it's probably no chance. But let me try. The model is HP-Agilent 0955-0520, Y088-4258, that can be bought for 600-900$. Here is a picture. When I bought the oscillator, I performed multiple ...
3
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1answer
101 views

Component identification, on USB 2.0 data lines

The component i'm trying to identify is on the usb 2.0 D+ and D- lines of a nintendo switch, its got two ground connections and has the letters DUG on it. Can anyone identify this component?
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0answers
86 views

Would a device with different power rails become one if both rails are shorted to ground

I'm trying to repair a nintendo switch that seems to have multiply shorts to ground. The shorts to ground are on the 3v3 rail and on the 1v8 rail. I seem to be getting continuity between the two ...
0
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1answer
103 views

Repair lifted ground pad on power amp

I'm repairing a 250W bass power amp board and one of the problems is that the pads for two ground wires have lifted off the board. It looks like it has had something of a bodge repair done before and ...
2
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1answer
126 views

Faulty temperature sensor on PCB - lights keep blinking, how to replace this?

I’ve been working on a broken continuous operating high power LED system - it starts blinking when powered. This was an indication of overheating and it was clear that the cooling fans have stopped ...
13
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4answers
4k views

How can I cover PCB burn marks to identify burns later?

I'm repairing a receiver from the 1990s that has a few burn marks on the PCB where a few transistors overheated. After replacing them and any other offending circuitry I'd like to be able to know if ...
3
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1answer
156 views

Is it the crystal / quartz?

I have a simple gadget (called "Fridgezoo") that talks when the fridge stays open. I always hated it, but my sentiments are with it (hey, it talks!) so I want to repair it. What's the problem? It ...
1
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1answer
81 views

Injecting power into circuit to find a short to ground

I'm trying to find a short to ground on a Nintendo Switch of which there are no schematics. The short is present on the 3v3 line. What I would like to do is inject power into this line from my ...
0
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1answer
124 views

Control board powered up with reverse polarity. power transistor blown. Is this repairable? [closed]

My dog chewed through the power cord. I 'repaired' it not paying attention to polarity. It was a 2A, 9V wall wart type power supply. The motherboard is from an elliptical exercise machine. The one ...
0
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2answers
119 views

Replacing a Capacitor on an Onkyo HT-R960 A/V Receiver

I have an Onkyo HT-R960 receiver that's been acting very flaky for the past couple of months. I've had to let it warm up for several minutes before being able to use it. I would also have to turn it ...
2
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1answer
75 views

Help Identifying a component for PCB repair

I'm helping a friend by attempting to repair this display PCB. It uses 24vac input and he accidentally hooked it up to 120vac. I am trying to identify the two components in this picture under the ...
2
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1answer
79 views

old 80C31 circuit not working. EPROM data retention issue?

I have an old piece of pro-audio gear in for repair. It dates from 1990. It was a fairly high-end piece of gear at the time and still has some value so it is worth repairing. But the symptoms I see ...
0
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1answer
147 views

How to solder this broken Gameboy Color part back on?

I'm trying to repair a GameboyColor where a part that held a battery broke off. I tried soldering it back on but it didn't stick. (I'm new to soldering) I took some pictures, any feedback and advice ...
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2answers
60 views

Help identifying replacement regulator

I'm doing some proactive maintenance on a vintage games console from the late 70s. There are a couple of linear regulators which I thought would be prudent to replace whilst I'm at it. Unfortunately ...
1
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1answer
208 views

How to test a MOV with no visible damage

As far as i know cumulative degradation occurs in a MOV when multiple surges appears in a circuit, A way to minimize this degradation is having multiple MOVs in parallel. This kind of damage can be ...
1
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1answer
411 views

Identifying strange burnt resistor color code

I'm trying to figure out the resistance of a burnt resistor in the PCB of a Hoover FD22G 011 (a cordless vacuum cleaner, with rotating brush; should be the same as the Deik ZB1516, which is the actual ...
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1answer
69 views

Help identifying SMD on USB Circuit (Wacom Intuos 5 - PTH850)

My Wacom Intuos 5 - PTH850 Tablet have one the following SMDs (the lower one, USB Data -) cracked. Could you help me identifying which component is? I know each component bridges USB data + with ...
0
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1answer
59 views

Where might the fault be in this battery checker circuit from an old camera? [closed]

I'm repairing an old rangefinder camera, a Canonet QL17 GIII. I have had to do a lot of internal rewiring. All is now working, except for the battery checker functionality. I've included that part of ...
2
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1answer
80 views

Replace bad voltage regulator with another one that have lower output current

I need to replace a shorted TL750L05 +5V voltage regulator with a new one. The problem is I can not easily find a replacement part that has the same features. I found the LM2931M-5.0 but is rated at ...
2
votes
1answer
108 views

repairing damage: what size ceramic bypass capacitor

Repairing a motor control board from a washing machine. A 1206 ceramic cap was burned up, there's a bulk electrolytic in parallel, rated 200v 1000uF. I've attached the example schematic for the ic (...
1
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1answer
70 views

Convert a blender into a dimmer lamp

I was sitting around and suddenly wanted to convert my old blender into a lamp. The control panel would act as a dimmer switch. (And maybe the pulse button would be a big hit at raves.) Can I just ...
1
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4answers
1k views

Replace a one shot thermal fuse with a resetting one [closed]

My mother owns a device for drying fruits and stuff. Now every year or so, the thermal fuse breaks. I'm always checking if the fan is damages or something else, but the device is always fine. It is ...
1
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1answer
385 views

Weller wes51 issue

My soldering station is a Weller WES51 for a long time. Today the station died, the LED didn't turn on and the tip doesn't heat. I opened the station and checked the transformer power switch and ...
1
vote
1answer
156 views

Identification of 5 band Resistor from power supply

This Resistor is not functioning The 4th band is Gold, I've read that means it's an exception. The 3rd looks to me as silver, not gray, this is why I've added a picture. I'd like to replace it, so ...
2
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3answers
1k views

Troubleshoot a backplane

I have built a simple bus backplane from stripboard and 40-pin female headers for a computer project I am working on. When I tested the backplane to make sure that it functioned, I found that it's ...
0
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1answer
76 views

Identifying damaged, burnt out, or missing components [closed]

Is it possible to deduce the identity of damaged, burnt out, or otherwise missing components (or suitable substitutes)? For example, below is the PCB of a 2 speed electric razor I've disassembled. ...
6
votes
4answers
1k views

Causes for a burned up flyback diode on a relay?

I'm repairing a control board for a premium washing machine (model #s at bottom for anyone that's interested). The machine was displaying an error code for relay failure. I took the board out of ...
2
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1answer
139 views

Autopilot gradual failure--help me guess what might be going on

Executive summary: Old autopilot for a boat, now drifts constantly to the right; I'd like suggestions on what might be wrong, and what some of the parts might be. Details: I've got an Autohelm 3000 ...
0
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1answer
231 views

Repairing an RFID antenna? [closed]

I have an RFID antenna that seems to be on a custom PCB. The issue I have is that the antenna on one side works fine, but the other side does not. I'm not sure if it is even possible or worthwhile to ...
0
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1answer
309 views

Glue/adhesive/epoxy for soldering a mems microphone

I have read a lot of articles on epoxy and glues for PCB especially with a ripped off pad. I am in the same situation myself and was hoping to get some suggestions here. . The mems microphone looks ...
0
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0answers
125 views

lecroy 9314l power supply repair

I've been trying to repair my lecroy 9314l for the past couple of days and i've sort of run into a wall. out of ideas. The power supply started to fail a while ago. It wont turn on when i connect a ...
0
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2answers
71 views

How can I mechanically secure a headphone cable after soldering on a new connector?

My headphone (Sennheiser HD 265) has a socketed connection between cable and headphone. The headphone cable had come loose, so I bought a new connector and soldered the headphone cable to it. The ...
0
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1answer
82 views

transistor replacement dp35dp

Hello I have an old Intel Motherboard DP35DP, I was using this board as a file server using RAID (Its crucial to get that RAID array working again). It seems like the culprit is a transistor, its ...