Wells Gardner K7197 No display with neck glow

galacticgames

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Hello tech gurus,

Got a Wells Gardner K7197. Did a complete cap kit on the board. Powers up. Has neck glow and I can see raster when I raise the brightness on the flyback, but I get no video on display.
I know it is not the game board (MK2) as I tried in another cabinet and get video. Now what would be the possibility that the 1c1 be the issue or even the neck board? After it runs for a period of a few minutes I remove the neck board and checked that no heat at all on the drivers.
Besides doing a reflow on the board.

Before the cap kit it did have video was a bit wavy, but was working.

Any help would be great.

Thanks
 

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If you had video before the cap kit then check your work around the 3 bipolar caps and the caps around ic1.
 
make sure you didn't mix up the 33 uf cap for C10 with one of the bipolar caps. they physically are the same size, but C10 isn't bipolar.
 
is your signal plug good? the sync wire is actually connected to the plug?
Before the cap kit it was working. Will find out tomorrow when I finally have a chance to install the board and see.
Went ahead and re-solder all the areas looked it needed reflowed including the video input section
 
Well same thing neck glows, but no video. I even replaced the video connector to be sure. Also on to the remote board. The pots were replaced as well.

Ok one dumb, well maybe not. The cap at c204 on the neck board. What value is that suppose to be. It is currently 4.7uF 250v. That leads to the 3 resistors then the drivers.
 

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Well same thing neck glows, but no video. I even replaced the video connector to be sure. Also on to the remote board. The pots were replaced as well.

Ok one dumb, well maybe not. The cap at c204 on the neck board. What value is that suppose to be. It is currently 4.7uF 250v. That leads to the 3 resistors then the drivers.
that's what C204 is supposed to be. only the more later model K7000s had electrolytic caps there, the rest were little poly caps. the - end of the electrolytic replacements should be connected to ground, where the 2 black wires are.

is the game actually running? in instances such as these you turn the screen brightness on the flyback up to see if you get raster at all.
 
that's what C204 is supposed to be. only the more later model K7000s had electrolytic caps there, the rest were little poly caps. the - end of the electrolytic replacements should be connected to ground, where the 2 black wires are.

is the game actually running? in instances such as these you turn the screen brightness on the flyback up to see if you get raster at all.
Yes game does work. I tested in another cabinet and no issues. And already did the flyback and indeed shows the rasters when brighten up.
 
Yes game does work. I tested in another cabinet and no issues. And already did the flyback and indeed shows the rasters when brighten up.
you can measure voltage at the negative composite sync wire against video ground. if it's open then you have a wiring issue between the game and monitor. if I'm following the issue correctly
 
Ok did a swap of the neck board from another k7193. Still no signal. Neck glow still good. Still get raster when turn up the flyback. I did re-pin the video connection. Jamma to connector has continuity. And as before it is not the board as I tested it next to another jamma cabinet and worked fine.

I did found another K7193, but going to rebuild that one and see anything changes, but that will be another day
 
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