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System 16 motherboard
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cal2
:cool:Following the repair of the golden axe rom board, I am now on trying to repair the faulty system 16 motherboard.
The symptoms are:
- Bad scrolling
- No sound
I suspect the ram chips used to store the scrolling data, but not sure. Also, the AMP used the motherboard may be defective.
[update 1]
the UDP7759 reset line is stuck low. It should be high. Don't know yet what chip is involved in the reset of the UDP.
The amplifier is good. It simply has no sound to amplify from the YM3012, YM2151 and UDP7759...
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