Solved loud BANG from motherboard ???

January 7, 2008 at 15:34:13
Specs: XP, P4 1.7ghz
powered up my spare INTEL D845GRG motherboard yesterday without any RAM in (just CPU, mouse,keyboard, PSU connected) and it gave me the standard beep error codes as it should. i forgot id previously taken out the RAM un not put it back, i was about to turn it off un put some in when i hear a huge BANG. no sparks, flames or anything visible, just the BANG. the board was right in front of me on a wooden desk along with the power supply but nothing visible happened. immediately i think uh oh, un quickly turn it off thinkin its definitely gonna be dead.

look at the board (especially the capacitors), they all look fine, look at everything else, it all looks fine. smell the board, no burning smell anywhere at all. opened up the PSU, nothing looks blown in there either and no burning smells. reconnect everything and... it comes on as normal. turn off, put the missing ram back in and it boots up loads windows XP un everything seems to be working.

now i know something definitely made a loud bang but have no idea what, un how long this board will carry on working for. can a failing capacitor blow making a huge bang and just look... normal ??? anyone have any ideas ?

cheers

bobtheblob


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✔ Best Answer
November 14, 2013 at 04:53:26
bobtheblob has offered the following update to this thread:

UPDATE: a couple of years later the same PSU finally died. after taking it apart (completely this time) i discovered the cause of the bang. there was a bulging capacitor i didnt even know was there, hidden right inbetween all the yellow/black wires on the circuit board, burst open at the top. when these things pop they sound just like a balloon when ya stab it with a pin. its loud ! anyway, thats that mystery solved ;0)



#1
January 7, 2008 at 17:34:37
It may have been the psu transformer that made the sound. If all is well, count your blessings.

Or it could have been the wood:)


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#2
January 7, 2008 at 18:12:59
no seriously... this was an electrical bang. like the sound you here when you wire a plug the wrong way round.

something electrical definitely blew. im damned if i know what it was. guess i'll just keep using it until something else happens.

ive had a small chip blow on a mobo before a few years back while it was overclocked, but that lit up like a bright blue firework and you could clearly see the damage marks on the plastic after.

this was a louder electrical bang than that one was though. weird...



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#3
January 8, 2008 at 11:56:37
the other day my PC (when swicthed off, but still plugged in)made a loud bang (sort of thing you describe), i quickly pulled it out from under desk and there was smoke around back of psu and it smelt of electrical burning.
It would not work until I replaced the psu, but i did take the old psu apart and could not see any sign of anything wrong at all, no black burnt bits, or burst capacitors or debris. So I am of the belief that these things can go bang with no visible signs (although i accept it seems totally illogical)- I realise yours still worked

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#4
January 8, 2008 at 13:48:47
You should never under any circumstances open up your PSU unless you are a qualified PSU technician. Very dangerous, and you're lucky to be alive.

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#5
January 16, 2008 at 19:44:00
thanks for the replies guys. still none the wiser as its still working perfectly.

im with u in that i think something in the PSU blew rather than on the motherboard, as like i said, it was right in front of me at the time (so was the PSU, but obviously not dismantled).

i believe the BANG was too loud to have been caused by the 12v supplied to the board, so surely it had to be something in the PSU. 240 volts enters into that. even though it still works, i think its a good idea to replace anyway as its maybe 5 years older than the mobo.

well, as for the safety warning. ive opened up every single PSU ive ever owned at some point. mainly just to check for dodgy/failing capacitors, as visible bulging/leaking is not something i leave to chance. as long as its not LIVE and your reasonably careful (like dont prod around components with a metal object), ive found it quite easy not to be electricuted so far.

apparently a monitor is more dangerous for a shock i think ? still ive opened up every one of them ive ever owned too ;0)

thanks again all



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#6
November 14, 2013 at 04:53:26
✔ Best Answer
bobtheblob has offered the following update to this thread:

UPDATE: a couple of years later the same PSU finally died. after taking it apart (completely this time) i discovered the cause of the bang. there was a bulging capacitor i didnt even know was there, hidden right inbetween all the yellow/black wires on the circuit board, burst open at the top. when these things pop they sound just like a balloon when ya stab it with a pin. its loud ! anyway, thats that mystery solved ;0)


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