Apr 042016
Got this bootleg board for a repair.
The game could be played with music and sound but had a problem on the text layer:
I started probing around until by shorting carefully pins of some TTLs I found the circuit of the text layer on the upper board.
A 74LS86@5J had all its output in the grey area (2.2V):
Changing it with a new one solved completely the issue:
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