Can't adjust blue k4900 centipede

sed6

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Hi all-
The blue on my centipede is very dim. The red and green color knobs work to adjust their brightness properly but the blue knob doesn't do anything. My monitor does display blue on the various screens but it's super dim on the black background. Blue shows up brightly against a green, red or yellow background on the game adjustment screen but not against black. Ideas?

The monitor was recently recapped and I don't have a signal generator so I'm limited to the games adjustment screen. And suggestion are appreciated.
 
first i would test the tube and that way you know whether its tube or chassis since you have already done a cap kit on it and i assume you replace 100% of the electrolytic caps and reflowed solder on the header pins??
 
first i would test the tube and that way you know whether its tube or chassis since you have already done a cap kit on it and i assume you replace 100% of the electrolytic caps and reflowed solder on the header pins??

Thanks! Complete cap kit yes, header pins not sure on. Worth pulling now and reflowing or maybe another test I can make?

The blue control knob does spin more freely than the green and red, could it be broken? Is there a way to test it?

Any ideas appreciated.
 
Thanks! Complete cap kit yes, header pins not sure on. Worth pulling now and reflowing or maybe another test I can make?

The blue control knob does spin more freely than the green and red, could it be broken? Is there a way to test it?

Any ideas appreciated.

to test the pot pull it out of circuit and test with ohm setting on meter.
 
i am willing to bet your issue is the tube.

you need to get it checked.

see if a local near you has a rejuvinator to help you.

if the pot was broke you would not have any color or be able to adjust it.
even if they are dirty, they will still turn the color up or down as you adjust them.

you say the pot has little affect, so this would mean that it was working to adjust what color tour tube was able to produce.

get the tube checked.

Peace
Buffett
 
I call tube too. if there was any problem in the circuitry for either the signal or driving the blue gun, you wouldn't see anything at all, blue would appear black or just missing.
 
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