G07 vert collapse

jgeiger

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Was working on a known good G07 chassis in my Space Ace and when I fired it up something smoked and now I've got vertical collapse. X401 and X402 test good and I tested the white resistor and its 68 ohms. So, I started going through the resistors in the 400 section and so far I haven't found the culprit. Also checked the diodes in that section and they seem good.

Is there anything else to check? Could the vert pots have smoked? Is there any other sections to look into?

I've been through just about every post on this and appreciate all the help. Anything else you can think of would really help me out.
 
Thanks Dokert. Ill run through those traces and see what I can find.

Heres where I admit my guilt. There was a wire that was connected to the 2 prong connector on the NTSC video board from the pin circled in the picture. I connected it backwards and thats what caused the collapse (most of my issues are caused by my own actions anyway). So, I cannot figure out what the pin is whether its a ground and I put voltage through it or vice versa. Ive looked at the Space Ace video board specs and dont quite understand that end either.

So, some more info if anyone has any ideas.

Thanks.
 

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Balls. Replaced the vert height pot and that didn't do it either.

That wire that I was referring to in the previous post was 16v to power the NTSC decoder. The other pin on that connector is ground. So, I had them switched which rant the 16v from the monitor chassis to the ground pin on the decoder board. Have no idea what that would do or whether or not the decoder board still works.

Man, I hate monitors.
 
Just replaced X401 and X402 as well as IC501 and still have vert collapse. Going to have to for through it one piece at a time and see if I can find something.
 
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