RCA D40W20YX1 chassis ATC221 (yeah that's old but it is best CRT condition).
After turn on, No raster (as it should be) till picture appears then I get light washed out raster lines with picture then one by one (all three colors) fades away to normal picture.
Plays fine for long time. I have worked on ATC221 and they don't do this like this even with related (next generation chassis (ITC222 that replaced ATC221).
Background on repair, I had to clean out the coolant (went brown tinted), reseal on two CRTs so the issue is now taken care of. Coolant leaked onto the green CRT board but repaired the damage and clean up. Unplug any one of three CRT boards then turn on. No temporary raster, just perfect turn on.
I might have issue on the adapter board (this what sets apart from ITC222 and ATC221), the power/deflection or small signal boards. But where? Sigh!
Measured voltages all is good.
Cheers, Wizard
After turn on, No raster (as it should be) till picture appears then I get light washed out raster lines with picture then one by one (all three colors) fades away to normal picture.
Plays fine for long time. I have worked on ATC221 and they don't do this like this even with related (next generation chassis (ITC222 that replaced ATC221).
Background on repair, I had to clean out the coolant (went brown tinted), reseal on two CRTs so the issue is now taken care of. Coolant leaked onto the green CRT board but repaired the damage and clean up. Unplug any one of three CRT boards then turn on. No temporary raster, just perfect turn on.
I might have issue on the adapter board (this what sets apart from ITC222 and ATC221), the power/deflection or small signal boards. But where? Sigh!
Measured voltages all is good.
Cheers, Wizard
