Please help an old TV repairman who started out with gasp tubes. I
opened up a GE color TV to set the levels and gain of the RGB signals
and to my suprise nothing on the neck board and nothing on the main pcb.
Am I S.O.L. with the green background or is there some special button
pushing sequence on the front to get to a service mode to set these
things?

Thanx in Advance
Jim