G07-CBO dead but will fire up 1 time out of 20.

itetcboo

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Never messed with monitors much but I recently got a super pac-man and it will usually not come up. It will play blind just fine and when it does show up on the monitor (takes many times of turning it on before it does) it will stay on for long periods of time and the picture looks decent but maybe a little of a slow wave to it. The dc voltage on the white wire on the large resistor nearest the CRT reads 120 volts when the monitor works right and comes on. When it does not come on the voltage reads 145 ish (fluctuates) and the monitor makes some kind of cycling sound like its trying to come on. You can hear it near the flyback. I also noticed a cobweb near the flyback that pulsates back and forth at about 1.5 sec intervals when the monitor tries to come on but doesn't. I was thinking about just throwing a full deluxe rebuild kit on it and seeing if that does it but does this sound like a failed component or maybe a cold solder joint on something?
 
sounds like a broken solder joint somewhere in the high voltage , look at the traces and solder joints , touch up suspects. A deluxe kit is pretty much a necessity in a GO7, what with shit flybacks and age of components. some people luck out and get ones that have been kitted , pretty much every one I have were original , the flys like to shit the bed and take the HOT out along with it as well
 
no cap kit yet. Just bought machine.

I pulled out the chassis and reflowed several connections that I thought might be suspect (they all looked pretty good actually). Put it all back together and now it seems to not come on the first time you try to fire it up but after the 3rd or 4th try it comes up. I should probably just throw a full deluxe rebuild kit on it but I don't know much about monitors and I don't know if that would fix it or not. If its a transistor or a resister or diode that isn't 100% it wouldn't come in the kit and I would be back to square one. I was reading on the trouble shooting chart that maybe c511 could be the problem?

Also both fuses are good and the power cord looks like its making a good connection and I get 120v ac at the plug.
 
ok

So if I turn on the machine once the monitor will not come up but if I turn it off and then back on again pretty fast (cant be to good for things) then the monitor will come up but the pic will look smaller than it should be then after about 30 sec it stretches out to full size. What do you guys think best guess will the deluxe kit with flyback caps HOT straighten this puppy out?
 
I would suspect a bad R901, or R902 neither of which is in any of the kits. I would pull and test them both. If they both prove to be within tolerance, start looking for cracks in traces and or cold solder joints.
 
Cap kit fixed it!

Installed a new cap kit and a new width coil and now she is working and looking good! On a side note it looked like C400something (forget which one) had blew up and left almost no trace of it. Literally it looked like someone unsolder-ed one leg of it and the rest blew up leaving only one wire in the board. As soon as I seen that I figured well there's your problem. :)

Anyways thanks for the help guys!
 
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