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I presume you've isolated the fault by pressing down on the BGA to see if you can make contact and change the system behavior. /quote]
Good idea to also slowly open and close the unit while booting to see if it spits garbage on screen suddenly (an intermittent open), the worst kind. It does localize the problem to the connections. At that point get a new lap top, it ain't worth the effort.
The open could be anywhere, or a failed component, reflowing the whole board might just create more problems. How would you tell though if theres nothing on screen?
I agree with this poster. 99% of electrical problems are visual.
originally posted by: VoidHawk
Get a very large powerful magnifying glass. Most dry joints can be seen! Dont think I'd want to apply heat to an old board, could cause more problems! Heat is about the only thing that destroys semi's, seem to remember reading something like every 5 degrees reduces a components life by 15 years!
originally posted by: VictorVonDoom
I wouldn't recommend either technique for repair, but at least with a heat gun you can direct the heat. Electrolytic capacitors can explode if overheated.