Cold Boot (CTRL-Break-Reset) has been done multiple times. As well as complete power down, including Mem Power and removing batteries. Tracing I can do and difficult or not. I am working with this thing open and in parts. I was testing in case, but the markings are then facing the back of the M102. To see VDD, VEE, and VB marking and test properly I pulled the motherboard out with no display or keyboard attached. I'll try to make room to get in all on a mat, but I am short on space. Whatever needs to be done, I'll try and do appreciate your help.
Thanks, GregS <>< ----- Original Message ----- From: "Fugu ME100" <[email protected]> To: [email protected] Sent: Monday, June 4, 2018 8:35:36 PM Subject: Re: [M100] Model 102 Black Nothing After Y2K ROM install OK they look good. The VB = +3.6V (approx) when powered down, it is the backup voltage for the RAM. It would appear that all the voltages are correct. The next step would be to start tracing out the address, data and control lines to make sure the buffers etc are all working when the unit is powered on. Hope to find a buffer that does not work or other failed chip or even a failed joint. It can be done with a MM but not easy. A cold boot might be worth trying if you have not already done so.
