wishiwas
Active member
Pac Man with garbage on the screen. No need to link to PM troubleshooting sites. Been there, done that, bought the shirt!
I worked on this board over a year ago and put it away after I broke some traces replacing the cpu socket. Just picked it back up and did the trace repairs and rang all the pins out and installed a new socket. I'm 90% sure that not it. I also replaced the cpu, vram and sync card.
What's odd is I get different garbage when I change the cpu or sync card etc but if you look at the pics you will see there is a pattern the way they display.
Based on another thread here, i tested the board with the notch oriented up, and the ground lead of multi meter on the bottom left leg, and the red lead of meter on the upper right leg, Im only getting 1.75 volts. Pin 11 shows 4.90 volts. Cap c51 is reading 0 volts, but i thought that was part of the sound circuit. C7 and 8 are 5.3 volts and c2 and 3 are 4.90 volts. Could the 0 volts @ c51 be the issue and if so, where to look. I'm using a switching dc power supply. Works good on other boards.
I worked on this board over a year ago and put it away after I broke some traces replacing the cpu socket. Just picked it back up and did the trace repairs and rang all the pins out and installed a new socket. I'm 90% sure that not it. I also replaced the cpu, vram and sync card.
What's odd is I get different garbage when I change the cpu or sync card etc but if you look at the pics you will see there is a pattern the way they display.
Based on another thread here, i tested the board with the notch oriented up, and the ground lead of multi meter on the bottom left leg, and the red lead of meter on the upper right leg, Im only getting 1.75 volts. Pin 11 shows 4.90 volts. Cap c51 is reading 0 volts, but i thought that was part of the sound circuit. C7 and 8 are 5.3 volts and c2 and 3 are 4.90 volts. Could the 0 volts @ c51 be the issue and if so, where to look. I'm using a switching dc power supply. Works good on other boards.

