Recent content by GoneMad

I have one similar to this. Some it wont do. but works on most. For the price, you can't go wrong.

S A few things to start with, *check voltage on the PCB *A good clock signal on P6 of Z80 *Do you have reset

Finally figured this out. I fixed the broken trace between pins 12 of 5E/F. What I should have done was remove the socket as well, not just add a jumper. Where the trace and lifted, it had shifted over enough that when the socket was pushed down, pin 12 of 5F was now shorted to pin 11 of 5E...

I checked the whole row 5. anything socketed tests good in the tester and the rest probes identical to a working PCB. I've added different pics above. you can see a white line above all the ghosts heads, the distorted lettering, and white dots in the corners of the maze. Groups of white pixels...

Weirdest problem. When I fixed the trace, the lines in sprites are gone, but then the screen goes like this. Haven't seen anything like this. When I remove the fixed trace, the screen goes normal and this problem returns.

Thanks HA, had a bad trace between 5E and 5F. That fixed the lines through the sprites but led to other graphic glitches. I'll keep digging at it.

Yes, new sockets Do you mean p12 of 2a-2d?,,,1a-1d are not populated

This board is almost complete. After multiple problems, the only thing to figure is there are lines through all moving sprites (ghost, PM, moving cherry). I have swapped the motion rams from 2A-2D with no change. This is not related to 5E or F. I have swapped them with a know working. Pin 14...

Oh yes, I have these in my list of whats good, I just forgot to put them in, I will edit that in.

I've been working on a spare PM. It's had a lot of issues but I now have it working. There is a slight sound issue. Everything sounds the same, no static. Eating pellets sound like eating a ghost, but maybe a different pattern of tone. There is no noise or "music" when you eat a power pellet...

Used a faulty "New" LS367..

I've been working on a spare PM PCB. It had some problems but now I'm kinda stuck. The game boots up and sits at attract. Press P1 and it starts. Pacman goes right or left and just sits there. The controller does not work at all (in the cab or on the bench). Also, sometimes after he eats a...

What Sam said for sure. If you don't have a probe, you should get one. It's a must for basic troubleshooting like this.

Good call!! Checked the voltage, was down to about 4.3V. Was able to get it back up to almost 4.9V and worked fine. Thanks