Sorry, I don't know where I could upload photos, but there are some in the German forum I referred to: http://www.thinkpad-forum.de/thinkpad-hardware/t-serie/71790-blink-of-death-reparatur/ The datasheet of the ADP3421 is available here http://www.hit-karlsruhe.de/aol2mime/datasheets/Z600/ADP3421.pd...

Simply bridge pins 16 and 24 of the ADP3421 with a resistor of 10k to simulate the "power good" signal.

Wow! I did it. It was really fiddly to solder the resistor to the tiny pins and I shorted some of them several times with too much solder. But don't worry - you won't blow the chip if you power it on with shorted pins. Just the board won't boot at all anymore. After several attempts soldering, desol...

I've got a T20 that shows BoD symtoms, too. Through google search I've found a solution posted in a German Thinkpad forum. They also refer to the ADP3421 as the root cause of the problem. But it seems the chip is not defective, as a replacement does not permanently solve the problem. What they propo...