DK with missing lines of graphcs

GrimJack0

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I have a nice DK machine that has intermittent loss of a vertical lines of graphics in the barrels and/or DK. Everything else os OK. I have replaced RAM and ROMS. Could it be the PSU? The +5 is a little low. The -5V and 12V are right on. There is a KGD-23S PSU in it. Does anyone know if there is a voltage adjustment on it? There is a small pot inside the unit bit I am not sure what it does.

I tried a switching PSU but that seemed to not switch on.
 
I have a nice DK machine that has intermittent loss of a vertical lines of graphics in the barrels and/or DK. Everything else os OK. I have replaced RAM and ROMS. Could it be the PSU? The +5 is a little low. The -5V and 12V are right on. There is a KGD-23S PSU in it. Does anyone know if there is a voltage adjustment on it? There is a small pot inside the unit bit I am not sure what it does.

I tried a switching PSU but that seemed to not switch on.

If you've replaced the graphical ROMS to no avail then it's most likely an issue with the Video PCB.
 
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