How-To Geek

Can you post a link to the schematic circuit diagram please.

You can use a multimeter to check the switch. There are I think 4 pins on them - two gets in contact when you press the switch. Test all the combination using continuity. There should be movement in the pointer when you press the switch. Alternatively, with power supply (battery or adapter), short the two pins with with a piece of wire (test all combinations), if the switch is bad, this should power on the laptop. Test also the flat ribbon cable going to the main board for continuity, especially the points from the switch going to the motherboard. I have seen some of them fails.

Not so much a learning curve but could become "a fools errand" as you have no source for highly proprietary replacement parts. The land fills are over flowing with proprietary electronic junk I'm afraid.

Tis Very Good if you can fix it. :)

Hi all

Just a last update. Had a look at the power switch pcb and all seemed to be working fine. Admitted defeat the only conclusion I could come to was a failed mobo. To expensive to repair for customer.

Thanks for all your help. Just starting out on my PC repair career so all the help I receive from how to geeks is very welcome. Thanks again.

Gary

Yes it I think it is possible if the defect is causing a short circuit on the motherboard, but it is rare. You can try removing the memory module(s) and power up the laptop. If laptop powers up, then maybe the "rare" thing happened to the laptop. One thing you might also like to look for is a busted fuse (marked as "F" on most pcbs) possibly on the power module.