Dodgy IBM PC Convertible power supply

Randy McLaughlin cctech at
Mon Jun 13 18:00:01 CDT 2005

From: "Tony Duell" <ard at>
Sent: Monday, June 13, 2005 4:48 PM

>> I've got a couple IBM PC Convertibles that exhibit the same problem with
>> their power supply.  When I press the power button (which is a momentary
>> switch) it turns on briefly: the disk drive light goes on and the drive
>> starts to spin or the display shows brief activity, but in either case 
>> for
>> only about a tenth of a second.  Sometimes if I hold the switch just 
>> right
>> I can get it to make it through the entire memory test and up to the 
>> point
> Is this switch on a PCB (like the PSU PCB)? If so, 'holding the switch
> just rignt' might be flexing the board just right to cure a cracked track
> or dry joint.
> This does sound like a mechanical problem, a bad connection, something
> like that.
> -tony

That's why a good magnifying glass is a must for a good tool kit.

Clean, inspect, repair!


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