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SOLVED: This was a bad LF13201 @ E11. It's only supposed to control the Y output, so not sure why I was getting mirrored and flipped from this one chip, but I was. Thanks for the help, all!


Tempest is displaying upside down and mirrored. Self-test shows no issues. Player 1 and Player 2 are both inverted and mirrored.


I've ruled out the monitor, edge connector, interconnect cable, interconnect headers (desoldered and reflowed), entire AUX board, video EPROMs, CPU and voltages with the help of two other known working boardsets. I've not done the program EPROMS as no research shows it could be them.

It looks like the 04 at J11 on the main board would logically be an issue as it seems to be a component both the X and Y have in common. Logic probe shows the same inputs and outputs for J11 on the faulty main board and the known good main board. Same results for the 174 at N9, which also has some video inversion responsibilities for both axises.

I've not located any other components that both X and Y have in common.

At this point, I'm at a loss.

Help!
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