Bars Across Screen - K7000.

thefader

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I just did a full cap kit (+ Filter Cap) on my K7000 running Golden Axe. There are still bars running horizontally across the screen especially visible when the screen cleans and is black. It is also much more noticeable when the brightness is turned down. What else could be causing this. Also the game had a bit of "Fuzz" visible through the game, and its still there. Any ideas on fixing these issues?

Note: The kit came with a cap for C204 on the neckboard. On my neckboard it is the wierd round orangish cap here. Should this cap replace this one, and could this be causing these "Jail Bars"?


Thanks
 
Can you post a pic of those two issues ?

Not all K7000's have an electrolytic cap at C204 on the neckboard. The older style tends to have one like yours. I'd leave it alone. If you do decide to go ahead and change it, be sure the - goes to ground and the + goes to the trace with R209 etc on it.
 
I'll try to get a picture, its only really visible when the screen is black.. I dont think I can get the "snowy staticy" issue to show on camera.. I'll try.
 
it's possible that you may need a ground reinforcement that wells did to 97% of all the k7000 monitor boards out there.. there are sections were the ground path becomes narrow. I believe this is why wells added the wire on the bottom of the chassis was to make the ground path wider for better electron flow.
 
also....the games power supply could be causing the bars on the screen.....check or replace it or test the tube with a signal generator to eliminate the monitor.
 
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