On Wed, 24 Sep 2003 16:42:32 GMT,
wrote:

Hi all-

Nearly as I can tell, there is both a separate audio board and a separate SRS board (F35750ST CTC160BG5). Both boards have no power, because I disconnected connectors 1903 and 1904.

There does not appear to be a separate Focus and screen Block. By the IVHT (attached to the back) is a white box with 4 wires and 2 pots inside.

SMPS voltages appear good, but no start-up, and still hear the ticking sound.

Really appreciate the help, just want to keep it going for a few more months……..

Mark

Mark,

Good progess on the SMPS. Before confirming the flyback is dud, needs
to check all diodes off the flyback isn't leaky or shorted. Need a
scope, lay the probe parallel next to the flyback ferrite core with
low volts/div on the scope and watch that scope while turning set on,
if fly is bad, the scope will show noise (arcing) in time with ticking
not the nice tall thin arches at 15.7 Khz.

Otherwise flyback is bad which is appox 60 to 100 in your area.
Focus/screen block is seperate from flyback. Solder that grey wire &
clean up all flux in focus/screen block with pure actone carefully
when you're changing the flyback.

I occassionally see this happen because the HV tripler (built into fly
itself) fry when SMPS B+ is high for too long due to capacitors in hot
side SMPS.
Same story with HV dividers in ctc169-based projectors.

Cheers,

Wizard