Hi there, i am new in laptop repair n not expert. in this situation many laptop comes to me with short circuit problem. but i cannot repair that's. multimeter show many caps and MOSFET are short but when i removed those from circuit i see the parts are not short. but circuit is stil short. today a dell came with tps51125a hot prob. i check some caps and MOSFET got shorted i removed them but i cannot find actual short with success. i also removed sio but still circuit Short. pls help me for find short circuit quickly with help of schematic or any other hidden method. thank advance.
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Re: how to find short quickly??? pls help.
Someone had a similar question, it's discussed here a little bit.
More info would be appreciated of course!
https://www.badcaps.net/forum/showthread.php?t=35231
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Hi all,
Recently picked up this GTX1650 at a local flea market for a low price and wanted to use it on my secondary PC. I first tested the card and saw the fan spin for a split second and then nothing. Immediately I thought of a short circuit. Disassembled and found a shorted SMD capacitor, injected voltage into it (1V/4A) and two Mosfets got hot immediately (QN3103 & QN3107). Desoldered these Mosfets and the card turned back to life.
Bought replacements from Aliexpress and replaced them afterwards. Tried the card but still the saw the fan spin for a split second... -
Hello everyone
Small technical problem on a Nintendo Switch lite
Here's what I noticed: the USB port has been damaged internally, with a short circuit on the power supply line to the small fuse.
After replacing the USB connector, the short circuit went away and I can't see any other short circuit in the whole motherboard.
When I charge the console, it seems to be charging: I get 15 volts and an amperage of 0.450 A.
Then, after a while, the amperage increases to 1.1 A and the BQ24193 charging chip starts to heat up, as evidenced... -
Hello.
I have seen a short circuit tester made with 3 * 9V batteries, a voltage limiter component and a resistor connected to the probes of a multimeter.
The theory is that the meter becomes sensitive enough to read very low resistances and the lowest resistance to ground on a circuit is likely to be a short circuit in that area.
Link
The Amazing $1 Short Finder Upgraded! Convert ... - YouTube
https://www.youtube.com/watch?v=0eixDdCpiO4
My multimeter isn't normally sensitive to very small resistance, but when I put a 1 mega ohm resistor... -
Hello,
I got ATX PSU SL-500 PSU. Images Attached.
It has blown VIPER22A, that I replaced.
Connected trough light bulb the bulb glows very bright indicating a short.
I tested every component on hot side of PCB and can't find the short circuit.
However the problem goes away removing +5VSB transformer.
The winding in questions of +5VSB transormer shows 0.08Ohms, is this normal?... -
Hello. MSI B250 Gaming M3 board, short-circuit on the power supply. Found a problematic mosfet VQ1
(N-PK616BA_PDFN8-HF) soldered it out - short circuit is gone. I replaced VQ1 + VQ5 (N-PK632BA_PDFN8-HF). VQ1 was replaced with PK618. After starting attempt VQ1 is lit again. What can be the problem? In the driver?
Schematic and Boardview here
...04-04-2025, 03:57 PM
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