I have a Thinkpad 560 that won't power up.
The internal switcher chips are in shutdown mode.
The signal from the power switch ain't getting to the
power supply. The signal comes from a maze of unmarked
smt chips. I gave up tracing it to the connector and
went looking for visual clues.

The vias are not solder masked and don't appear to be plated.
There are several with some corrosion. I put wires thru the worst
ones. Now, the power supply will come up if I bend on the
main board just right.

I have no idea how to find open circuits on inner layers without
a schematic for reference.
The service manuals I downloaded from IBM are useless in this regard.

Is there a way to obtain the schematics for at least the power control
part of a Thinkpad 560? Even the pinout for the connector between the
main board and the power converter board would greatly simplify
the search.

Gotta be free cause this thing is gonna be
pretty much worthless even if I get it working. I just hate to see
it go to the landfill.

Thanks, mike
--
Return address is VALID but some sites block emails
with links. Delete this sig when replying.
..
Wanted, PCMCIA SCSI Card for HP m820 CDRW.
FS 500MHz Tek DSOscilloscope TDS540 Make Offer
Wanted 12" LCD for Compaq Armada 7770MT.
Bunch of stuff For Sale and Wanted at the link below.
MAKE THE OBVIOUS CHANGES TO THE LINK
htremovethistp://www.geocities.com/SiliconValley/Monitor/4710/