Sync Problem? with Hook by Irem

XianXi

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Joined
May 23, 2007
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Working on a Hook PCB with a weird problem.

Upon firing it up it boots normally then when it gets to the attract mode it makes it seem like someone is playing with the monitor voltage.

I don't think it's the sync as the picture pincushions like someone flipping the monitor off then it comes back and does it randomly.

Traced the sync back to a resistor pack which tested fine (100ohms per in/out) then from there it goes to the upper board to a custom QFP. I checked the resistors on the QFP and all are the same 250ohm. Roms all check out and are flashing normally.

Does the QFP generate the Sync signal itself?
 
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