Does occasionally connecting the input and output do any harm to the voltage regulator?
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no, you just risk blowing the hell out of the parts it powers!
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Thank you, I am not worry about that... I seek for elegant solution to modify ch341a to program 5V ic like 93xx, 95xx, so I just put jumpers over 3.3v and 5v headers pin...Comment
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well:
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So, I am inventing hot watter...
I see some video where is doing ugly modification to bring 5v to ziff... BTW, for 3.3v mod, I would rather use thin wire and insert piece or two of kapton tape between leg and pcb then lifting it so high... if anytime ahead the leg has pushed down again, it would break...
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i slipped capton under it and linked it with kynar wire
then put a dab of rtv silicon on the pin
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Hello esteemed members. I appreciate that my question will strike some as being somewhat childishly simple, but it genuine perplexes me! I have repaired several laptops before by removing a faulty capacitor that was short-circuiting the motherboard, whereupon the laptop would then work. For me, it begs the question that, if the current can bypass where the capcitor was when it has been removed, why didn't it just bypass it when it was present and faulty,? I can't get my head round the premise that if the other side of the capacitor is connected to ground, then why doesn't the current simply bypass... -
Good morning, everyone!
I've gotten my hands on a few laptops with various defects because I want to get more involved in repairing electronics.
First up is a Fujitsu Lifebook U7511.
It won't turn on anymore and doesn't respond in any way when you plug in a power adapter.
Model: Fujitsu Lifebook U7511
CPU: Intel Core i5-1135G7
GPU: Intel Iris Xe Graphics
RAM: 16GB DDR4 - 3,200 MHz
PCB manufacturer: ASKPCB?
PCB serial numbers: CP801602, CP7984241-Z4, E239218, CP809978-01
Damage: Liquid damage
The liquid probably...11-01-2025, 03:09 AM -
Device Information
• Model: MacBook Pro 14” M1 Pro (A2442)
• Logic board number: 820-02443-05
Original Issue
The device suffered liquid damage, causing a short circuit on the logic board.
Near the audio jack area, the CR852 capacitor pad was severely burned, creating a clear short-circuit path. The board could not power on properly.
Work Performed
Removed the short circuit by drilling through the board (bypassing the short path) in the CR852 area.
Current Status
• When powered on, the screen shows support.apple.com/mac/restore....10-20-2025, 11:15 PM -
Hi,
I have a Lenovo IdeaPad 3 15IAU7 that suffered water damage. It doesn't turn on (white power light flashes when on button pressed), and the amber light flashes when plugged in.
Symptoms:- Short detected – sparks appear when touching the charging port connection with board with a metal (even a multimeter probe).
- Visible damage – after cleaning corrosion, I found 4 possibly burnt memory chips near PC3165, labeled UD5, UD6, UD7, and UD8.
What are my next steps to diagnose and possibly repair it without replacing the entire board? Any guidance would be greatly... -
Hello freind i have hp elitebook 725 g3 White liquide damage
after cleaning the board i find à damage resistor white no value i test it not reading in multimeter
could some one tell me the value of this resistor
Thank you
...
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