I am sure this has been posted upteen times, but what is the best way to check for short circuits that are not obvious. Is there a method. I hear a crayon trick? I have 2 motherboards that just kill the psu. Got no idea how to tell what's causing it without going through lots of new psu's. One is a imedia Acer media system which pops the psu and at £49 a go cannot afford it.
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Re: short circuits on mobo laptop
Get a low voltage high current bench supply with current limiting. Set it to the rated voltage and 0 current, then gradually turn up the current to a few hundred mA while feeling the board for hot/warm parts. -
Re: short circuits on mobo laptop
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I've purchased this weird (and might add appears to have had a fairly rough life) laptop a while ago for $1 at a yard sale. It powered up one time, (saw a POST screen!) Then, never powered again. I've since thrown it in some dark corner, BUT, I've decided to look at it again. First, this seems like a very obscure laptop, mine just has the name "BIT" on it and nothing else. Very similar (same?) can be seen here https://www.vogons.org/viewtopic.php?t=54655.
At first, I had gotten the weird mini display on the lower part of the laptop to display a few icons, but if I attempted...01-02-2025, 03:22 AM -
Hello,
first of all I want to apologize for my bad English, but I try to give my best.
Customer brought me a laptop, which is charging the battery (when the dc-jack is connected) but don't power up when the power-button was pressed down. Only the white LED lights up, and you can hear a short noise in same interval when power-button was pressed and hold for longer timer. The customer changed already battery and dc-power-adapter.
For this laptop the correct shematic is the service manual "Clevo NH50ER NH57ER NH50EPS NH57EPS - 6-71-NH5S0-D02 Schematic".... -
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the comon problem they say , the charger will shut off power once plugged to laptop , i dont have battery, its long gone ago , i use it for backup with adapter and vga port to external monitor(yes no screen lcd) in case my desktop needs fix . one thing for sure i could say the clr resistor - r010 beeps ,short at both sides , the checked all the coils , the 3 coils together gives all of them beeps short along with their respective capacitors . i dont have voltage ampere injection dc machine as in videos i have seen they see where its getting hot and they remove the short and replace components...
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