First, I've searched high and low and have seen the many different posts on PP and what a difficult game it is to work on. I didn't listen and am already at wits end and don't even have self test up.
Here's what I have done:
1. Sense mod
2. Both boards read 5.1v
3. Power and grounds tied together from test points
4. Replaced Z80 (sound) and socket
5. Replace 7H (105) and 7F (116) Roms
6. Replaced 6161 RAM at 7E
7. cleaned pins and Re-seated all chips
8. replaced chips in WDR and POR circuit (161, 259, 138
9. Checked to insure all Customs are in the right spot
10. cleaned edge and connector
I have not replaced the big blue caps yet due to the fact that my 5V is stable (and is not moving at all / via scope).
WDR looks to be doing what is is supposed to be doing but RESET is toggling low in a repeatable fashion. I've tried tying WDR LOW as well as RESET high but nothing, nada, zilch. I expect even more difficulty once I do get to a test screen but can someone spin me around a few times and point me in direction to get me out of my RESET LOOP?
Cheers everyone!
Here's what I have done:
1. Sense mod
2. Both boards read 5.1v
3. Power and grounds tied together from test points
4. Replaced Z80 (sound) and socket
5. Replace 7H (105) and 7F (116) Roms
6. Replaced 6161 RAM at 7E
7. cleaned pins and Re-seated all chips
8. replaced chips in WDR and POR circuit (161, 259, 138
9. Checked to insure all Customs are in the right spot
10. cleaned edge and connector
I have not replaced the big blue caps yet due to the fact that my 5V is stable (and is not moving at all / via scope).
WDR looks to be doing what is is supposed to be doing but RESET is toggling low in a repeatable fashion. I've tried tying WDR LOW as well as RESET high but nothing, nada, zilch. I expect even more difficulty once I do get to a test screen but can someone spin me around a few times and point me in direction to get me out of my RESET LOOP?
Cheers everyone!

