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 ...

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4
votes
2answers
112 views

How to replace a 50 ohm speaker with 25 ohm speaker?

I'm repairing an electronic device at home. Actually it has a non functional speaker. So I've to change it. This speaker is a 50 Ohm, 0.2 Watt. But I didn't find this one on the market, what I could ...
3
votes
0answers
70 views

Asynchronous motor with motor capacitor sometimes won't run backwards when it should

The long story short: Is there any chance that an asynchronous motor with a run (or start?) capacitor fails to run backwards when the capacitor ages and loses a significant portion of its rated ...
0
votes
2answers
46 views

How to wire headphones? [closed]

I'm currently trying to fix my headphones with a TRRS jack that I recently purchased. I'm using my multimeter and have figured out that green/blue wires together make up the left audio channel and red/...
-1
votes
1answer
34 views

How to use a continuity test to differentiate between wires? [duplicate]

I'm trying to repair my headphones with a broken jack. I just purchased a replacement TRRS jack, and now my problem is knowing the function of the five different wires in my earbuds. How can I use a ...
-5
votes
1answer
55 views

How to tell the difference between headphone wires? [closed]

I'm trying to fix my TRRS type headphones but I can't tell the difference between these five wires. -Blue -Red -Green -Copper (red-ish?) -Black
0
votes
0answers
5 views

What is the best way to repair these motorbike wires? [migrated]

2 of the wires on my motorbike were cut and used to hotwire it. It's been recovered and I need to permanently connect these back together. What would be the best and easiest way to do this? An image ...
-1
votes
1answer
51 views

Identifiying and Cleaning leaked capacitor (which it was not)

Trying to fix a device that has a huge cap that leaked badly. The leak is like molasses. Maybe thicker. And there is around 2 puddles of 2-3 teaspoons each. I cannot clean the thing very well. So i ...
2
votes
1answer
96 views

What does neutral and live both being at +120VRMS above earth imply?

I am trying to fix a twenty-year old unsupported piece of scientific equipment that is very expensive, delicate, and needed by my boss/the lab in two weeks' time. I have identified that the reason it ...
1
vote
1answer
64 views

How does a Touch Screen Digitizer Tester work?

I'm currently replacing my screen for my Iphone and having issues with my touch screen dropping. The guy who sold it to me said he used this to test it. http://www.ebay.com/itm/LCD-Display-Touch-...
9
votes
1answer
2k views

Phone disassembly: what's that part for?

I replaced a broken screen for a Moto G (1st generation), and now I'm struggling with 'ghost inputs/ghost touches'. In order to track down the problem, I came across a part which is located between ...
0
votes
1answer
46 views

Need help identifying power transistor 11SL60H

Hopefully someone can help me identify what these two transistor are. I believe they're toast as the y open across all pins. Normally I can google parts like these but this one I get absolutely ...
1
vote
5answers
114 views

Switching power supply only works when warm

Update With the multimeter and a steady hand, I've found the 3843B PWM controller Vcc pin is 12V when the supply is on, and 8.2V when it is plugged in but cold. Datasheet says it needs 8.4V Vcc to ...
1
vote
0answers
101 views

Need help repairing adjustable DC power supply stuck on 48V

I have a cheap benchtop dual-output adjustable DC power supply. One of the outputs is working alright, the other one "burned out" when it was left loaded somewhere near 80% of its maximum for 24 hours....
2
votes
2answers
386 views

Accidentally removed SMD pad

I had been attempting to desolder some SMD ceramic capacitors off a PCB to measure their capacitance. Unfortunately I am quite new to soldering and have managed to screw up. The below picture shows ...
1
vote
2answers
365 views

What is the correct replacement for this mosfet?

I'm trying to repair a broken DC-ATX power supply that I have. After a bit of searching for faults I believe I have tracked the problem down to one of the MOSFETs. I would like to try replace this ...
0
votes
1answer
58 views

Wire laptop power switch to another switch

A little background to my question: I got a laptop some time ago from my grandparents because the screen was broken and they didn't want to fix it. Being your typical tech geek, I already have a ...
0
votes
2answers
155 views

Please help me identify the SMD component in the picture (or help me fix my Wacom)

Could anyone help me identify what type of SMD component the one in the red circle is? The label seems to be ID but I can't really tell very well because it's so small. My guess is that it's a diode ...
-1
votes
2answers
98 views

How do I identify a burnt out component? [closed]

I was given a project completed by another group, they had left school and I was taking over the project from them, with the information that it is not working properly because "something burnt out or ...
10
votes
3answers
225 views

Seeking advice on resistors in switching power supply

I am trying to repair the power supply in an LCD monitor. It is a fairly basic design around an OB2268AP in the 20-30 Watt range. The power supply had failed spectacularly because the main MOSFET ...
0
votes
1answer
59 views

Electronic soldering and repair for a newbie

So, recently, I've been trying to get more skilled with electronics to prepare me for college, starting with soldering. I mentioned this to someone I know, and he gave me his broken E-Cig, saying I ...
-2
votes
1answer
64 views

Need help with replacing a headphone jack [closed]

I have found a ton of guides to do this, but i don't have a store bought connector so i simply ripped the stock one open. It looks like this (found the pic on the internet, not mine): http://static....
0
votes
3answers
103 views

LED circuit with epoxy and (broken?) transistor

I'm trying to repair this battery-powered LED bike light but do not really understand the circuit. Positive terminal middle left, negative bottom left. Momentary push switch at the top, transistor ...
0
votes
2answers
197 views

How can I repair a Goot PX-201 soldering iron which was exposed to too high AC supply voltage? [closed]

I had a stupidity to plug 100V Japan version of Goot PX-201 soldering iron to 220V. It heated up for a second, but that was it, it no longer heats up. I tried to disassemble it, hoping to find a ...
3
votes
3answers
301 views

What is the science behind percussive maintenance?

On electronic devices in the '80's, electronic malfunctions could sometimes be temporarily fixed by physically "hitting" the device. For example, I once had a colour TV - "ECTV" (from Electronics ...
1
vote
2answers
71 views

Determining which diode I need [closed]

I have the following board with the below diode: One diode fails circuit testing and needs replacing, but how do I find out the specification of the diode I should buy to replace it? (it is for a ...
0
votes
1answer
78 views

Help identifying K1P Z4 transistor

I am not electrically savvy person but I have general idea of what some things are and what they do. I have this nice computer video card that has a broken transistor on the back side and is not ...
1
vote
1answer
278 views

Spark in blender motor [closed]

I was trying to repair a blender whose speed buttons were not working. I thought of removing the speed regulating circuit altogether and directly connect power to the motor. Now, when I run the motor ...
-2
votes
1answer
201 views

Does this TV power supply board look damaged? [closed]

So a suspected power surged killed out Mitsubishi WD-65738 DLP TV the other night. Upon looking up the error code "48", I ended up buying and replacing the main board PWB-MAIN. While this didn't seem ...
0
votes
1answer
162 views

Oscilloscope Repair - Heathkit

I found a great deal on an old Heathkit I0-12 at an auction the other day and decided it would make for a fun project. The unit looks awesome and could probably survive a bomb blast. When I got home, ...
2
votes
2answers
492 views

Best way to fix burnt PCB trace?

So I accidentally burnt a PCB trace and I'm trying to fix it with a wire + some solder. The PCB trace clearly connects two metal pins. My question is, would it be better to completely bypass the ...
0
votes
2answers
314 views

Help me identify this mystery IC? [closed]

I had a bug (yes, a literal bug) decide it would be a good idea to crawl inside my printer and short itself across two pins on my printer's power supply board. I have pulled the board in the hopes of ...
4
votes
1answer
327 views

What is a good process to replace a discontinued part?

I have been looking about (on the web and printed catalogs) attempting to replace a part that is now discontinued. The experience has been part success - and part failure. A part is available to use ...
0
votes
1answer
67 views

Toubleshooting PCB circuit - strange Zener diode behaviour

I have two units of a device which I shall call deviceA and deviceB. DeviceB is malfunctioning. Therefore I compared the resistance values of the same components on the boards of both deviceA and ...
-2
votes
1answer
143 views

Fix a broken Power Supply using existing connector (Newbie) [closed]

I am hoping to attempt to fix my childrens ride on electric car as the power supply was left charging and has cracked / broken (see pics). I am completely new to electronics, but was hoping to ...
3
votes
1answer
160 views

How to replace a SMD capacitor on a raspberry pi?

(Note: also posted first in raspberrypi stackexchange, but not a single answer yet) While desoldering the GPIO, I accidentally broke the capacitor C13 of my raspberry pi model B (2011.12 Rev7). It ...
-2
votes
2answers
95 views

Help fixing Honeywell doorbell broken circuit [closed]

My Honeywell RCWL330A1000/N P4-Premium Portable Wireless Door Chime dropped to the floor the other day and has not worked since then. I unscrewed the casing an found a crack in the circuit board which ...
0
votes
2answers
93 views

Trying to Fix my remote for my house Fan, is this component a fuse?

Decided I would try and fix the remote for this 3 speed fan I have a home since it is summer now. Here's the circuitry I'm dealing with here: So here our are some notes: There was some battery ...
3
votes
1answer
225 views

Burned Out Tantalum Capacitor Replacements

I have an old computer with a broken Miniscribe 8425SA hard disk. One of the capacitors has burned out, and need some help finding a replacement. Here are my questions: It appears there are ...
0
votes
1answer
367 views

Replacing a SMD inductor, alternatives?

Trying to fix a board that had a SMD inductor. it was labeled L1 on the silk and there was no marking on the part, and I have no schematics. ...or there may have been markings, but someone tried to ...
0
votes
1answer
387 views

Single LED broken on 12V LED bar?

Modules of 3 LED Simple LED strips or bars that are using 12V input voltage often have the following layout: They consist of modules with 3 LED each, all connected in parallel to the input voltage. ...
1
vote
1answer
86 views

Considerations when repairing dimmer switch

I originally asked this question on DIY StackExchange. So far no answers and a suggestion to try on Electronnics, so here goes: I have an IKEA lamp with dimmer switch which took a knock and ...
0
votes
1answer
60 views

What kind of failures can be explained by this fix?

My Dell PowerConnect 2324 is normally plugged in 24/7. At some point it stopped working (no connectivity, power light out) and I disconnected it from the network and power. Recently I opened it up and ...
2
votes
1answer
145 views

4/5 band resistor - extra black band

I have two resistors which need to be replaced. I tried to determine the value, but it can't make sense of these black bands: For reference the bands are: brown - silver - green - brown - black ...
1
vote
2answers
199 views

nichrome alternatives

I am repairing an AVO multiminor Mk 4 which was in a sort circuit across a car battery while in the 1 amp measuring position. circuit diagram here an obvious casualty was the 0.25 ohm resistance R1 ...
0
votes
1answer
58 views

Tracking a circuit path across a crack?

I am new to the world of electronic repair. I have connected several wires to this board and have been successful in getting the paths across the crack to connect. Is there an easy way to trace out ...
7
votes
4answers
3k views

Is it safe to clean contacts with an eraser?

Today, while I was cleaning a RAM module, I was thinking about this. An eraser is really a easy way to clean gold/copper contacts in such modules. And it is really tempting to do so. I did it a few ...
2
votes
2answers
120 views

Computer Power Supply Testing Safety

I have a 750 watt ATX power supply that I will be testing with a multimeter to make sure the right voltages are present. How can I make sure that I do this safely? Is there anything that's threatening ...
2
votes
2answers
262 views

SG6841 based SMPS output droops on load

I am repairing an Elo Touch monitor ET1515L which, happily, has dual mains and 12V inputs. It works when powered from 12V supply but struggles on mains. I see sets of capacitors for the PSU board ...
2
votes
1answer
201 views

Can you identify this Bose car amp burned part? [closed]

Many more pictures here The radio and amp stopped working after a battery jumpstart. I fixed the radio by simply changing a fuse but the amp has a burned part. I tried contacting Bose to no avail. I ...
-1
votes
1answer
109 views

Is this board trace repairable? [closed]

The attached picture shows the main board of my Canon S110 camera. The camera was subjected to a shock with the USB cable connected. This resulted in the connector breaking loose from the board with ...