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Ahh, thanks - that's a shame. I found the hardware mod you referenced, so I may try that.

Appreciate the welcome! Thanks! I have again checked U8900 and surrounding components. I have made diode-mode measurements for each pin, and compared to a known good board. I previously found a bad R8900 this way, and replaced it. I have a few other maybe-bad/maybe-not-bad readings I'm not...

Ok, after I thought about a while, that P1V8GPU measurement I took must have been wrong. I measured at pin 1 of R1600, which I see now is associated with the CPU power rail, not for GPU. I did go and check the following enable signals for GPU at the resistors around U9100 - and the signals are...

This machine was going to a blank/dead screen while in use, more and more often. Eventually it got to the point where it would chime on re-boot, but the lcd would show no image. Tried re-soldering/replacing U8900, then when that didn't help, realized I needed to stop guessing and start...