nanano ms8 dead

marlboroa

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yesterday it worked fine, today its dead. no neck glow or anything. fuses are good. what would cause it to go dead like this. also i have another nanao that the bottom of the pic is fine but the top has lines in it. it also has a white line across the center of the screen. im guessing cap kit for that one?
 
I know if my MS9s get fed a freq too far out of range, they chirp loudly and auto-shutdown, then the power needs to be cut from them for a few minutes before they will come back on.

Simple, but some people leave their games on all the time, and just shutting it off and then back on won't reset the circuit on my monitors. They need a good 3-5 minutes cooldown time, and not waiting just means you have to wait another 3-5 minutes again. I can hear the circuit reset, and they're good to go.
 
this one doesnt chirp. it worked yesterday because my daughter was playing it. today she turned it on and nothing on the screen. i put a spare in it and i get this. this is chassis #2 by the way.
P4290043.jpg
 
Start with recapping, looking for cold solder or bad parts while you do...
 
ok i changed most of the caps on the one that works and it has no change. i could not change the all because i didnt have them all on hand but i would say i changed about 90% of them.
 
That looks like vertical foldover... have you tried shrinking the image vertically, and moving the image down?

DogP
 
update: the working one now works all the way. it was a cold solder joint on one of the resistors for the vertical deflection. someone did a hack job on the bottome of the pcb and one of the resistors was not making good contact. now to start on the dead one.
 
Yet another update:
I changed all the caps on the dead one and the 2 resistors. i forget which ones but they are the 2.2k and 15k. Anyway it didnt make any difference. It's still dead. no neck glow, static, or chirping. Both fuses are good so what else should i check.

Also on the working one. how do you wire up the degauss circuit. I need to deguass it but dont know where to wire a switch at.
 
There are usually red wires coming off the back left corner that have a connector on the end. This goes to a manual degauss button normally installed inside the coin door. If there are no wires, look for connector pins back there....
 
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