texasmame
Well-known member
Getting chatter from the board but no pic on the monitor.
The 7432 at J2 is responsible for brightness/intensity on the boardset. It was already socketed. Tested it in my known good boardset (also socketed at that location) and it was bad. Replaced chip, no change.
Traced back inputs with logic probe until arriving at the 7404 at I8, which was not producing output on pin 2. Replaced chip. Pic restored.
The 7432 at J2 is responsible for brightness/intensity on the boardset. It was already socketed. Tested it in my known good boardset (also socketed at that location) and it was bad. Replaced chip, no change.
Traced back inputs with logic probe until arriving at the 7404 at I8, which was not producing output on pin 2. Replaced chip. Pic restored.