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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1answer
56 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
77 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
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2answers
166 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 ...
0
votes
0answers
20 views

18000BTU/220VAC thermal fuse instead of 9000BTU/110VAC

The clerk in a shop told me the thermal fuse of 18000BTU/220VAC Is equivalent to the 9000BTU/110VAC one, for an air conditioner, is that right? the parts look exactly the same.
4
votes
1answer
263 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
48 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
60 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
49 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
59 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
61 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
79 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
98 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
84 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
62 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
56 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
45 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 ...
0
votes
2answers
56 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
47 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
1k 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 ...
1
vote
2answers
73 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
81 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
138 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
85 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
740 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, ...
0
votes
1answer
287 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
110 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
865 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
123 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
122 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
66 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
78 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 ...
1
vote
1answer
206 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
158 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
0answers
71 views

How should I repair my old Geiger-tube?

I have an old soviet Si-3BG Geiger-counter tube. Both ends of the glass tube have a metal cap which serve as the two electrode. This cap was glued to the glass ...
0
votes
1answer
71 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
105 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
124 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
101 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
321 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
409 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
165 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 ...
-1
votes
1answer
63 views

What values can I change when replacing a 200uH 2Amp coupled inductor?

I am replacing a coupled inductor (with corrosion on it) on a liquid handling robot board, in hopes to fix a blowing fuse problem. The part number is not coming up in any search I have tried so far, ...
1
vote
1answer
167 views

Will a 1950s television still work? [closed]

My company has a Philco Predicta television model H3407 as described here: Philco Predicta description. Will this TV still work with modern broadcasts?
-2
votes
1answer
114 views

Have I destroyed my device [closed]

I have connected a wrong adapter to my Inforce 6410 device. It takes 5V but I have accidentally connected a 19V adapter. The board got heat up and I saw some smoke, now when I connect the 5V adapter, ...
2
votes
1answer
195 views

Cleaning oscilloscope range switches

The various range switches on my oscilloscope obviously collected some dirt over the years. Sometimes the input attenuators show a frequency dependent response (just like poorly matched probe) and the ...
4
votes
3answers
281 views

help for identifying an unknown chip

I've found a burned chip (due to DC power overload) inside the sound card Roland UA-25EX. This is a picture of the part: Can someone give me a hint? I'm not an expert, I want only to find the spare ...
-1
votes
2answers
448 views

How to find a problem on a Non working Yamaha SPX90 (Pro audio) effects unit [closed]

I have an electronic processor unit namely an SPX90 (a 19" pro audio effects unit made circa 1987). I'm a home studio producer and have owned it from new from 1987, but it died a few years ago. Now ...
1
vote
1answer
3k views

How to test capacitors of non working circuit board using capacitor meter?

I bought broken sega megadrive 2 clone console. Something wrong with 7805 IC supply (I changed to another, but no result). But now I want test electrolitic capacitors and resistors, because I thing ...
3
votes
1answer
293 views

Replacement cap (filter / choke) for oscilloscope power supply

My dad's poor old Philips PM3070 scope died in a sizzle and a puff of smoke a few days back, after being sat in the garage for a year or so. He donated it to me and it seemed to work at first, but ...
5
votes
3answers
252 views

Removing solder effectively

I have an Epihpone (Les Paul 100, fairly standard) electric guitar, which over the years have gotten to suffer from a non-functioning bridge pickup. I verified this using an ohm-meter, the result ...