Sony VAIO PCG-Z505LE laptop power problems

[Sam Goldwasser]

Someone gave me a Sony VAIO which plays totally dead with either the power
adapter (tested good using DMM and on another identical laptop) or charged
battery. By "totally dead" I mean absolutely no indication that power is
getting beyond the DC socket or battery terminals - not even a momentary
flash of any LEDs.

I'm told that the laptop just died suddenly while in use.

I've removed everything that will unplug from the mainboard without
any change.

The single fuse I could locate (near the DC input) tests fine.

I doubt it's worth the cost of a new mainboard but any other
suggestions other than "replace that piece of junk" appreciated.

Thanks.

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[Andre]

Someone gave me a Sony VAIO which plays totally dead with either the power
adapter (tested good using DMM and on another identical laptop) or charged
battery. By "totally dead" I mean absolutely no indication that power is
getting beyond the DC socket or battery terminals - not even a momentary
flash of any LEDs.

I once had the opposite problem on a Compaq Presario, where the power
supply was "tripping" when connected to mainboard.

I'd check to see how far the power gets to the various chips, you will
likely find that it is a SMPS startup problem.

Yours,
_A