donkey kong redout...

learpilot2

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I just bought a donkey kong. When you turn it on, the entire screen background is dark red / maroon in color, with 1 inch wide vertical strips throughout. The picture also looks like it needs to move an inch to the left. The monitor has a 1/2 inch wide black space vertically down the left side of the screen.

The game plays great, and after a few minutes of being on, the vertical lines diminish slightly, and the all red background turns more of a dark maroon/black, and is slightly less noticable.

The only other problem is a really loud background hum in the speaker. I have the 2 board system. I centered the CPU sound pot, and adjusted the very sensitive volume pot on the monitor board. That adjusted the volume, however, the really loud speaker hum is still present.

I found a missing ground wire on the power cord, but that repair made no change with either problem.

Should I adjust the V or H position pot to center the screen, and get rid of the 1 inch of vertical black screen on the left side?

Should I adjust the red pot on the yoke/neck circuit board. I know nothing about doing those type of adjustments.

Is this a case of a Sanyo monitor that just needs recapping, and the sound board re capping? Where is the sound board on a 2 board system? Is it part of the cpu board?

Thanks for the help.
 
Without a pic it sounds to me like you need to cap the monitor and the sound board. The audio section is integrated into the PCB. It's the amp that needs to be capped. It is located on the monitor. It's a small board about 2"X3.5". The black bar sounds like foldover. Buy a deluxe cap kit from Bob Roberts and you should be fine. That hum is a definite symptom of old caps. Post a pic of your monitor in action just to verify.
 
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You will not get rid of all the hum. That is a Nintendo "feature".

It may just get a little quieter. Before I capped my DK you could easily hear the hum accross the garage, now you have to be pretty close to it. - Barry
 
the red lines may be the brightness up way to high (i had this problem on a vs smb i got it had jaibars and someone had turned up the brightness all the way to hide it )

in the end sounds lik a cap kit when you order a kit make shure it includes the caps of the power section as well or you might as well not do a cap kit (if i rember mine had a bad c607 or 609 in the power circut causin other caps to fail)

the cap on mine hat was causing jail bars was the black cap nect to the fly back on the outer edge (gotta love inline cap testers lol you learn somthing and fix your monitor instead of replacing everything and not knowing what caused the problem to begin with)
 
the red lines may be the brightness up way to high (i had this problem on a vs smb i got it had jaibars and someone had turned up the brightness all the way to hide it )

in the end sounds lik a cap kit when you order a kit make shure it includes the caps of the power section as well or you might as well not do a cap kit (if i rember mine had a bad c607 or 609 in the power circut causin other caps to fail)

the cap on mine hat was causing jail bars was the black cap nect to the fly back on the outer edge (gotta love inline cap testers lol you learn somthing and fix your monitor instead of replacing everything and not knowing what caused the problem to begin with)

That's cool. I've just made it a habit to cap every monitor I get, but it sure would be nice to know what each one did. - Barry
 
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