Quote:
Originally Posted by Steve McVoy
Shorting the screen grid resistor brings the screen up to the supply voltage, well above what the schematic shows as proper. Cathode voltage comes close to what it should be (17 vs 18 v relative to the the -135v buss).
Every part in the damper and boost sections has been changed. As you can see, there is very little connected to the boost (hor. osc and CRT screen grid pots). All those components have been checked too.
I see no other possibility other than the flyback.
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Before you replace the flyback have you checked the sine wave coil? I have seen the sine wave coil cause lack of width in rca set's many times. Are you sure that that you have proper p-p wave form on test point w 18. Re Check c124,r 147 and c 127. You may be right about the fly but I would re check the sine coil just to make sure it is not your problem. Does the screen fill out when you turn the horz hold control? I forget which way you would turn it but try both directions and see if the screen fills out and see if you get some kind of increase in the hi voltage and boost voltage.