View Single Post
  #1   Report Post  
dougk_ff7
 
Posts: n/a
Default Sony TV-- KV-1913 (SCC-265B-A) Power Supply Issue?

I've been working with a dead Sony KV-1913 for a while... apparently,
all of a sudden, it started making all sorts of buzzing noises, and
just failed to work. From a friend's advice, I checked capacitors,
replaced one, and at the same time, replaced a blown 1.5A fuse (like it
just popped of old age... no blackening around the glass). So all is
well, I go to power it up, and apparently, something else isn't quite
right--it blew its main 5A fuse pretty fast. Tried bringing it up in
series with a light bulb (with the degauss coil removed), and the light
bulb is almost at full brightness, probably indicating a short, though
resistors and capacitors seem to check out fine in the power supply
section. Also, when powered on with the light bulb load, there is a
high-pitched whine (perhaps the horizontal deflection?) Transistors
were also checked, and I didn't see any giving a dead short, but I
might be missing some...

Pretty much, if this is the flyback giving me headaches, I think it's
time to retire this TV and take it out to the recycling center, but if
it's possible it is another part that I haven't checked, or perhaps
missed, help would be appreciated. I've tried running through all of
the possible scenarios on the SER FAQ, and just haven't made it any
progress with any of those possibilities...

Perhaps one source of this short, the only place on the board I noticed
blackening was in an insulated clear tube--I think it's insulating a
capacitor in an odd spot beside all the connectors (to the power
switch, degauss, etc.) and near the main filter capacitor. It seems to
be charging up fine, but that's the only spot I see any blackening at
all.