skforty
New member
I previously had a sound corruption issue with my burgertime. The main problem in the sound was caused by the sram @ 10H. The manual calls for the ancient Mostek 4118, I socketed and replaced with a 6116. I also had 2 eproms with corrupted data. This restored my audio.
Now the problem is that my sound works perfect if I boot the game cold, after about 3 minutes, the sound corrupts and then disappears. I have to let it sit for a bit to get the sound back, so it sounds like something is overheating? Maybe the audio amp?
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Graphical Issue:
Now the board is only showing half of the score and high score list, also anything green half red.
It seems voltage related because i can get it to appear normal if i leave the board on for a bit, then play wit the voltage. As i adjust the voltage within the 5.01-5.10 range you can see it having a direct effect on the issue. But if i let the board go cold, the graphical issue returns on the next boot.
I have a 2nd burgertime board that is working perfectly, I've swapped the sound cpu and sram etc, no change.
Maybe a flaky transistor?
Regarding both issues, I've done the following:
-Reseated the roms
-Recapped the audio section
-Cleaned the sockets
-Replaced the volume pot
-Verified the data on eproms
-Set my voltage (tested at the PCB).
-Replaced the 50pin IDC cables.
Any suggestions/help is greatly appreciated, thanks!

Now the problem is that my sound works perfect if I boot the game cold, after about 3 minutes, the sound corrupts and then disappears. I have to let it sit for a bit to get the sound back, so it sounds like something is overheating? Maybe the audio amp?
---------------------------------------------------------
Graphical Issue:
Now the board is only showing half of the score and high score list, also anything green half red.
It seems voltage related because i can get it to appear normal if i leave the board on for a bit, then play wit the voltage. As i adjust the voltage within the 5.01-5.10 range you can see it having a direct effect on the issue. But if i let the board go cold, the graphical issue returns on the next boot.
I have a 2nd burgertime board that is working perfectly, I've swapped the sound cpu and sram etc, no change.
Maybe a flaky transistor?
Regarding both issues, I've done the following:
-Reseated the roms
-Recapped the audio section
-Cleaned the sockets
-Replaced the volume pot
-Verified the data on eproms
-Set my voltage (tested at the PCB).
-Replaced the 50pin IDC cables.
Any suggestions/help is greatly appreciated, thanks!

