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Author Topic: Qix (bootleg) #1  (Read 2197 times)
tim
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« on: November 20, 2005, 04:44:23 PM »

Symptom 1
Game boots, but has "jailbars" (lines through the graphics).

Tests
Probed data pin on all 4116 video RAM with logic probe. Found two RAMs with a data pin floating.

Fix 1
Pulled, socketed and replaced the two RAMs whose data pins were floating. Jailbars now gone.

Symptom 2
Overall green tint to screen.

Tests
Probed the 2148 color RAMs. One RAM had a bunch of pins floating. Swapped the two RAMs. Now the
screen has a blue tint. One RAM must be bad.

Fix 2
Replaced bad 2148. Green/blue tint now gone.

Symptom 3
Missing or very faint red colors.

Tests
Scoped red signal on JAMMA adapter. No signal. Scoped signal at edge connector. Signal present.

Fix 3
Cleaned edge connector. Red now present. Game fixed.
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