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