Hello,
this is my first post at Badcaps and in general i am new to fixing electronics. I am looking forward to learn a bit more about diagnosing and repairing :-)
What I have around is a DELL OPTIPLEX 3060 Micro (USFF), which is not powering on, even not showing any signs of life (No amber / white LED).
I got a original 65W DELL PSU / Power brick (PA-12 / 074VT4) which hopefull should be the correct one. I could get another DELL PSU with the Partnumber 0G6J41 with the same 4.9mm DC Jack connector as the one I already have, but I dont think that would help (maybe...
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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... -
Hi everyone, I wanted to ask you for some advice
on this board: HP ProBook 640 G5
6050A3028601-MB-A01(A1)
I have a short circuit on the 19-volt line.
I initially found and replaced this faulty MOSFET, Q60C10.
Then, when I powered up the board, I had the same problem. The MOSFET failed and is giving me a short circuit.
I wanted to ask if it's possible to try to find the faulty component by injecting current, and at what point, so I can check the damaged component with a thermal imaging camera.
Thanks everyone for the advice.
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Hi everyone,
I need help clearing the BIOS master password on a Dell OptiPlex Micro Plus 7020.
I have already extracted the 16MB dump using a CH341A Pro programmer and a SOIC8 clip. The NVRAM area seems to be encrypted.
- Model: Dell OptiPlex Micro Plus 7020
- Chip size: 16MB (128Mb)
- BIOS Chip: Winbond 25Q128JV
I've attached my original locked dump. Could someone please patch it or clear the password for me?
Thank you so much in advance!... -
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...