DK monitor issue Sanyo

Thanks Buffett... I've tried adjusting the pots and the whole screen adjusts but the area on the left remains. Monitor is fine for about 15 minutes until it starts doing what is in the video. Other ideas?
 
my next thing to look for is cold solder joints.

you seem to be having problems when it warms up.

give the chassis a good re-flow and see what you get.

after that, i would start in the H-Hold section looking for out of spec resisters.

Peace
Buffett
 
Check your 50K pots on the game PCB.

I was going to suggest the same thing. Left side drooping down is the classic symptom of the pots on the PCB. It's weird that he gets the same thing with both PCBs though. Makes me wonder if its monitor related.
 
Thanks for the advice guys. Turns out it was the 50k pots on BOTH boardsets so I am glad you all chimed in and I was wrong about the chassis being the culprit. I hate when a coincidence like that throws me off!

Only other issue I am having is that there are blue lines that extend up a tad from all of the ladders and on the attract screen where is says "Donkey Kong" the letters kind of have the same blue spike.

PCB or chassis issue? I couldnt adjust it out from the chassis...

Thanks
 
Thank you for the help - I will adjust and check when I get home forgot to adjust those!!!!
 
You guys were all spot on and I was taking it in the wrong direction with the chassis

Adjust the blue pot fixed that last of my issues. Now I know how to correctly tune a nintendo monitor. Thanks
 
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