tnglc79
Member
I have a dedicated Simpsons which is all original. Had been in storage for 15 years because the power supply went out. I replaced the power supply and the game plays great, but...
In stage 3 the intro characters show, but once gameplay starts there is only the shadows on the ground. This remains the same until close to the end of the graveyard scene, then everything comes back. You can walk across the threshold one way and they disappear, then back the other way and they come back. The Scene in Moe's does it for about six inches of the whole scene as well. No other part of the game seems to have any other issues.
So far, checked voltage, cleaned EPROMS and sockets. Checked board for small cracks (had never been removed prior) Cleaned edge connector and harness. While cleaning the EPROMs, I verified them (mask roms) against a known good dump and they all checked good.
Just ordered some 27c010 eproms to write new ones (plus I am going to burn the freeplay rom) just in case there is some bad code the verification is not reading.
Is there anything else I should look for in the mean time to see if the problem is elsewhere?
In stage 3 the intro characters show, but once gameplay starts there is only the shadows on the ground. This remains the same until close to the end of the graveyard scene, then everything comes back. You can walk across the threshold one way and they disappear, then back the other way and they come back. The Scene in Moe's does it for about six inches of the whole scene as well. No other part of the game seems to have any other issues.
So far, checked voltage, cleaned EPROMS and sockets. Checked board for small cracks (had never been removed prior) Cleaned edge connector and harness. While cleaning the EPROMs, I verified them (mask roms) against a known good dump and they all checked good.
Just ordered some 27c010 eproms to write new ones (plus I am going to burn the freeplay rom) just in case there is some bad code the verification is not reading.
Is there anything else I should look for in the mean time to see if the problem is elsewhere?
