Punch-Out vertical foldover/overdraw

The Punch-out that I recently obtained has a monitor issue (a monitors issue, really). Both displays are bring drawn starting ~2″ from the bottom of the monitor, and the upper few inches are being overdrawn on the same horizontal plane.

In other words, the beam is scanning left/right correctly but is starting too low and is not going high enough (vertically) to complete drawing the image correctly – the beam stops going up and keeps trying to draw the rest of the screen on the same horizontal line, causing a higher-intensity line to be seen (images below, apologies for their quality – I guess I shoulda taken off the Plexiglas first).

Top Monitor Overdraw Bottom Monitor Overdraw

The overdraw is visible in the image, but it is not obvious from the images that the bottom of the image is ~2″ higher than it should be. The overdraw looks like a classic capacitor problem to me, although I admit that I am not that familiar with the “starting too high” problem and I am guessing that the two are related. At least, the two things being related kinda makes sense in my mind…

I have cap kits from The Real Bob RobertsTM (highly recommended for all kinds of arcade-related parts, BTW!) for the monitors and will be capping them shortly.

More to follow…

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