Loots like I had more spares than I thought. I swapped the CPU, CIAs, Kickstart, Gary, Agnus (an 8370 for the 8371), Paula and Denise. Of course, I can't speak to whether the spares were also dead, but I took my chances. (This is an A1500, btw, but it had an upgraded Denise .. the 8373!
I also discovered that the reason my keyboard light did not come on was because the keyboard light in that keyboard was dead. Everything else about it was fine. :/
Under the cpu actually looks better than the areas to either side of it, which have a bit of the grunge from the battery leak. The underside of the board is entirely pristine.
My next job will be to measure resisters, put some capacitors in the problem area on order for replacement, and use the R6 schematic, as best I can, to check all the traces coming out of the cpu.
Any other advice is welcome. Desperately welcome, in fact. I'm still especially interested in the significance of the one second blue-screen flash. Should I take that seriously?
Bo,
Start with the power supply, take a multimeter and check voltages at the motherboard connector.
just in case you lost the tick signal,you might change the jumper to get tick from video.
Don't just push down on chips, this is useless, pop each and inspect it and the socket for tarnished/bent pins. reinstall the chips.
I have spare s871,8372a agnus if you need one, I am in texas, so shipping would be quick(i think you were also in texas). just Pm me here if you want it.
Mike
