by cosmicB on Sun May 06, 2007 6:25 pm
In this problem, the first thing to do after all the checks don't show anything, is to substitute the power supply...
A new power supply is about $60...
You can get a used power supply from a junk computer, at a garage sale, for about $2...In this problem, the first thing to do after all the checks don't show anything, is to substitute the power supply.. and the CD rom...
A new power supply is about $60...
You can get a used power supply and CD drive from a junk computer, at a garage sale, for about $2...
In topic.. "tapping things with a piece of wood.. it works often... IC chips internal gold wires sometimes aren't flash welded properly... Tapping the bad chip will sometimes make a faulty weld fail or stutter.. which is why sometimes a kick will fix an electronic device... Plus, electronic connections create their own dirt of corrosion, by electron flow, and the heat of current, even if they are air-tight sealed...
The alternative to tapping transistors to determine intermittents in transistors is to slightly heat them up with a hair drier, then cool them down with a 1/4 second burst of freeze spray... If there is a gold wire problem that will show it up...
It isn't viewed as "clutching straws" in the electronics trade...
It's a basic method of fault diagnosis when the problem isn't obvious, or is a rare one... It's called, "doing a general hardware evaluation"... The whole evaluation might take from five to ten minutes after you have access to the circuit boards...
Way too often the problem was caused by user abuse... like the lady who brought her new stereo in for repair... It had sound only on one side, on speaker... I found a dime in it on the circuit board... The coin had shorted out the amplifier chip, and burned it out on on side... While I was reconnecting the stereo, her kid enters the room, and says out of the blue, "I never dropped a penny into the radio"...
We used to get tv's into the shop, that had huge plant tray water marks on top, and serious water damage to the interiors... You can't water plants on top of tv's.. and it's not a good thing to wash circuit boards with windex.. especially when the set is on...
A general hardware evaluation is too often oh so necessary.. because the usual info from the average consumer client, is "Duh..? Umm? It was working yesterday.. and um duh, now it's not working today?"..