Hi there, I trying to find a short on my motherboard,I dont know which component causes a short, I use a multimeter but it always short on points PAD
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Re: find a short on my motherboard
semiconductors can short out . also capacitors can but not as often .
transformers can also short out but you might smell that first . -
Re: find a short on my motherboard
Hi
Hi many way's to test for a short one way with multimeter diode mode red probe on ground and black on say +vbat whats the resistance? Just make sure no power is to board. Next way if you have and idear where short is meaning circuit wise like charging
you could apply a very low voltage and with your hand's touch around to see whats heating up or to be safe use a thermal imager to see hot spot ... just by lifting the big square coil and inject voltage there for that circuit to see if the buck controller or fets are heating up again if it's a 3V line only inject like 1V is everthing is cool you could gradually increase voltage until hot component shows it self. I hope this help
Techman1025Comment
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Re: find a short on my motherboard
htank u veryyy much. i try this tonightComment
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Hi beginner here, so I'm not sure of I've done this right 😅 trying to diagnose my laptop's motherboard (dax31mb1aa0 rev a). I don't quite know how to read the schematic, so I'm attaching the pictures of the motherboard and the measurements.
I was attempting to measure resistance to GND on inductors. I disconnected motherboard and used "continuity testing" setting on my multimeter. I put black probe to Ground & red probe on an inductor. Did I measure this right? Am I correct to think that 0.3 ohm measurement indicates a short circuit? Thank you for your help!... -
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!
Recently I have a problem finding a dead short (as far as my cheap multimeter is concerned) on a multilayered (12 layer) PCB. It is caused due to mechanical stress (warping the board and, I assume, cracking inner layers). Injecting voltage of 0.9 V (operational voltage of that part of the circuit) and drawing 0.5 W doesn't cause any visible hotspot on a thermal camera.
Does anybody have any tips & tricks in order to locate the short more or less precisely? The area has a lot of powerplanes, so it's both blessing and a curse.
Silly idea no. 1: Can I... -
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... -
hi , my motherboard is short after ram change. here is some pics. i think this component is short. thank you...
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