See posting with binary attachment in alt.binaries.schematics.electronics
for excerpt from training manual and short description of basic SMPS
troubleshooting in the posting.

Didn't they cover SMPS basic operation in one of the electronics degree
classes?

David

"Rono" wrote in message
...
You guys are missing the info!! These units will not run
with high standby B+. Scopes & EEPROM changes won't
fix it. I tried everything I could think of. Just read again. Rono.

RCA 25" M # 25GT536, chassis # CTC177AG. Unit was dead,
replaced STK-730-010 (shorted), R104 1.5 meg ohm (gone high),
C4105 10UF @ 250 Volt (gone leaky), checked/replaced CR4108
(130 volt line), changed C4402 (warped), 12 volts, & 5 volts standby
is fine, 5 volts to EEPROM, & tact switches, but 130 volt line is +146
volts dc. B+ to LA7610 main jungle IC +7 volts. B+ to horizontal output,
& drive is + 146 volts, & unit won't start. What did I miss? Rono.