DarthSonic
Member
I have 3 PCB sets for my Turbo, each one has issues. Now that my monitor works, I can finally get to getting PCBs to work. I'll give info on each PCB set and anyone can help me improve them, it will be greatly appreciated.
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Set 1
Set 1 came with the game. There is no metal box housing the processor, so my guess is that someone replaced the processor and replaced the ROMs with a decrypted set. The traces on the board look in poor condition. Also, I cannot just place these ROMS in another board set because the replacement processor was soldered in place.
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Set 2
Set 2 originally looked pretty good. Everything but the road showed up. However, the game would often glitch and the car would get stuck at the bottom of the screen. I figured the legs on the ROMS were dirty (which they were), so I cleaned the oxidation off of the legs on every socketed chip. I also cleaned oxidation in each socket. After that, upon boot up just the road is showed for a split second. Then some glitchy characters are shown for another split second. After that, there is just a screen filled with the letter 'S'. It also appears that there is the yellow dotted line from the road on the screen when it is filled with 'S'. Note: I only cleaned one at a time and am positive all went back in the same orientation they came out, which was easy since the notches on the chips all face in the same direction.
Before cleaning oxidation:
After cleaning (note the yellow dotted line):
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Set 3
In Set 3, the trees, buildings, and and cars are all missing in action. On the plus side, the game never gets hung up. Actually, with no cars there is nothing to crash into I maxed out the score on this game to see what would happen. To anyone curious, the score just starts over from zero. The in game score stays in sync with the score on the 7 segment display, so the absolute max score is 99999. If you score higher, the recorded score will end up lower since it starts back at 0. Back to the diagnosis. On this board, I went into the games test menu and the RAM tested good. On the ROM test, EPR 1262, EPR 1263, and EPR 1264 all tested good. I have not touched this board other than reseat the ribbon cables.
Thank you to anyone with ideas of what to check or do with any of these boards.
----------------
Set 1
Set 1 came with the game. There is no metal box housing the processor, so my guess is that someone replaced the processor and replaced the ROMs with a decrypted set. The traces on the board look in poor condition. Also, I cannot just place these ROMS in another board set because the replacement processor was soldered in place.
---------------
Set 2
Set 2 originally looked pretty good. Everything but the road showed up. However, the game would often glitch and the car would get stuck at the bottom of the screen. I figured the legs on the ROMS were dirty (which they were), so I cleaned the oxidation off of the legs on every socketed chip. I also cleaned oxidation in each socket. After that, upon boot up just the road is showed for a split second. Then some glitchy characters are shown for another split second. After that, there is just a screen filled with the letter 'S'. It also appears that there is the yellow dotted line from the road on the screen when it is filled with 'S'. Note: I only cleaned one at a time and am positive all went back in the same orientation they came out, which was easy since the notches on the chips all face in the same direction.
Before cleaning oxidation:
After cleaning (note the yellow dotted line):
-----------------
Set 3
In Set 3, the trees, buildings, and and cars are all missing in action. On the plus side, the game never gets hung up. Actually, with no cars there is nothing to crash into I maxed out the score on this game to see what would happen. To anyone curious, the score just starts over from zero. The in game score stays in sync with the score on the 7 segment display, so the absolute max score is 99999. If you score higher, the recorded score will end up lower since it starts back at 0. Back to the diagnosis. On this board, I went into the games test menu and the RAM tested good. On the ROM test, EPR 1262, EPR 1263, and EPR 1264 all tested good. I have not touched this board other than reseat the ribbon cables.
Thank you to anyone with ideas of what to check or do with any of these boards.
