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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votes
1answer
44 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): ...
-2
votes
0answers
70 views

What's wrong with my ZD 931 soldering station?

When I switch it on, the display stays off and an acoustic signal is present. The manuals state a few reasons: The fuse is gone. The fuse looks good and to double check I used the multimeter to see ...
0
votes
3answers
55 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
0answers
67 views

Through Hole Repair (Missing Pad, Car ECU)

I've got a older Toyota ECU here I'm trying to save, as even though I have a replacement, since it's 97 model year, keeping the original ecu will save me from having to figure out how to sync the ...
0
votes
2answers
79 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
277 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
62 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
0answers
47 views

Testing RF Diodes (“Hot Carrier Diodes”)

I am in the process of fixing an RF mixer (sampler) in HP's 5257A Transfer Oscillator. It contains two diodes, both in series with a 2.2 kΩ resistor. The circuit is built to work up to 18 ...
0
votes
1answer
60 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
103 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
141 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
104 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
165 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 ...
1
vote
2answers
211 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
292 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
59 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 ...
-1
votes
1answer
97 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
76 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 ...
-1
votes
2answers
77 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
68 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
151 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
186 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
180 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
76 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
59 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
82 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
121 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
53 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 ...
6
votes
4answers
2k 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
98 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
192 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
160 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. ...
0
votes
1answer
97 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 ...
10
votes
3answers
858 views

What are these cream plastic-like blobs on my circuit board?

I see these white/cream colored blobs all over the board (I've surrounded them with red rectangles in the image above), something which I've never encountered before. They're plastic like in texture, ...
2
votes
1answer
595 views

How can I fix this ESC circuit?

What happened: Two of the blue wires touched while an 11.1v battery was hooked up and POP What's in the photo: Yellow is the heat shrink wrapper I cut open the material with square impressions on ...
0
votes
3answers
131 views

Can this circuit board be repaired?

This is a board out of a Super Nintendo game cartridge. It appears to have damage from a few of the leads, and this game definitely doesn't work when tested. The game is very rare and worth my time ...
2
votes
3answers
1k views

Can a 6.3v capacitor be replaced with a 16v capacitor? [closed]

I'm repairing my old 478 socket computer motherboard and two 6.3v 2200uF capacitors near the CPU are bust. The computer still powers on, but it doesn't pass the BIOS screen without the ps/2 mouse ...
0
votes
2answers
141 views

What component: a glass tube wrapped with a wire mesh and has a single metal pole inside?

I found this while trying to fix my noisy hot/cold water dispenser. It has a blueish glow and makes a loud buzzing noise of around 56-58 Hz. I'm planning to replace it, but there doesn't seem to ...
1
vote
2answers
169 views

Explanation for super-sensitive loose contact inside potentiometer?

Symptom I have a mixing console, where one 6-pin stereo pot is errartic. When I turn it all the way down I sometimes can still hear the left channel at full volume. Explanation The circuit is a ...
0
votes
1answer
89 views

Multimeter reports voltage but no power?

I have an Insteon FilterLinc, which is an electrical line filter. It doesn't work. When I connect a lamp to the "filtered" outlet, I get no power. So I stuck multimeter probes into the filtered outlet ...
0
votes
1answer
102 views

Beginner PCB Repair - Voltage Regulator Issue

During a fault finding mission on my car I found the Vref on a sensor that should be 5V sitting over 7V. I traced it back to one of the modules and found the pcb mounted voltage regulator was ...
2
votes
1answer
422 views

Schottky diode as AM detector?

An old AM radio that passed down to me from my grandparents finally ceased to function after I accidentally dropped it and old parts inside got damaged. I ripped all damaged parts out and replaced ...
0
votes
1answer
217 views

Solution for broken pin repair (SMD(SMT) components)

While I was working with a IS62WV51216BLL-55TLI, I broke off by chance a pin at the base near the component body. that's perfect! LoL! It makes me to think about this question: Can we fix such ...
0
votes
1answer
73 views

What is the device used to diagnose bad eletronic hardware? [closed]

I'm quite new to electronics repair and was wondering what is the device that is used to diagnose electronic hardware such as chips and power voltages. I'm not talking about a multi meter, but the ...
0
votes
2answers
126 views

Soldering problem when changing component on tablet board [closed]

I needed to change demaged Schottky SMD diode (2.2x1.2mm) at chineese tablet board. But I was not able to melt solder even I used hot gun at 400°C or soldering tip at 480°C. Finally I more or less ...
2
votes
0answers
141 views

What is this motherboard component that looks like a bead of solder [photo], and can it be repaired/replaced? [closed]

As you can see, the one on the top is burnt. Whenever I plug the power adapter into the wall, the component releases a puff of smoke and the adapter instantly shuts itself off. The damage to the ...
0
votes
2answers
126 views

How can I fix this Firewire 800 header by soldering? [closed]

Unfortunately I found the headers on my computer's belkin 3-port Firewire 800 all tilted back somehow, and they snapped off when I tilted them forward to where they should be. As a quick fix, I have a ...
0
votes
4answers
585 views

How important is “mm pitch” for a capacitor? [closed]

I want to repair my boiler, so I found this howto. He writes I need a MKP X2, 26.5 x 10 x 19 mm, 0.47 µF 275 V/AC ±10%, 22.5 mm pitch. The closet one I can find ...
4
votes
2answers
422 views

Might swollen caps be working properly? [closed]

I've seen these two swollen caps in a symmetric +12, 0, -12V power supply. The circuit (a theremin) seems to be working properly, but I don't know if that caps are going to cause damage in the ...
3
votes
1answer
172 views

Identify failed component [closed]

Since this is my first question here, I hope this is on topic. The power supply of one of our old CISCO Aironet 1231G wifi access point failed recently, after a power outage. I think that the power ...