loss of all color but still have picture

[gatordad]

Alright I'm confused what would cause this. I have swaped 2 different boards so it's definitely monitor related. I give the cab a shake and color comes back after the jiggle. connection issue or something else.
It's a WG u5000

[Ken Layton]

First check for bad solder joints. Then check resistor R811 on the main board. It is supposed to be 100k resistance.

[qrz]

hmmm, r811 is on the abl line ....
if open , i'd think the pic would be dim/ washed out rather than "no color" . 
also check c805, c808 ( 2.2uF/200v ) and c810 (10uF/63v)

qrz

[SirPeale]

hmmm, r811 is on the abl line ....
if open , i'd think the pic would be dim/ washed out rather than "no color" . 
also check c805, c808 ( 2.2uF/200v ) and c810 (10uF/63v)

qrz

That does happen, but a lot of the time you get a dim B/W picture when R811 goes.