Kortek missing blue [RESOLVED]

[antron]

My tri-res Kortek KT-2914F drops the color blue after being on for about a minute.

I'm assuming a transistor is going out on the neck board and plan to replace it (maybe all of them).

I just wanted to check if others thought this was likely the problem.

Thanks

[Dave_K.]

This is the same problem which happened to my planet harriers monitor Friday night. Its a D9200, but yes, the transistor on the neckboard is probably the cause for my color loss. Not sure if Kortek is prone to the same kind of transistor failure.

[antron]

I got another vote for the transistors in a PM, thanks.

[antron]

OK, each color has these transistors in the R-CUTT/R-GAIN circuit

KSP44TA x2
KSP92 x2
KSP2222A x1
KSC3503 x1

The first three seem to be general purpose, the last a CRT video amp. Should I start with it?

[antron]

user grantspain suggests the changing video amp/driver first.

final edit:
grantspain was right, the main CRT driver, KSC3503, was the only problem.