PVM-8220 No color, black and white picture only

As the title says I get no color out of a 8220 pvm. Adjusting the pots on the color circuit have no change. Neither does adjusting the color and hue knobs on the front of the pvm.
The only possible issue was the black dust in the picture below, but there are no burned traces, no popped caps, and after cleaning it all, nothing looks damaged or cracked in any area of the pvm.

The pots on the power circuit do work to adjust position and such.

Any help is appreciated.

http://imgur.com/RRvZ9aD

I've had this problem before check your wires that connect your games of your using a scart break out cable double check and also the scart socket. It seems like a stupid thing but God knows I've done it a million times.