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Old 12-29-2008, 06:55 AM
johnfull johnfull is offline
AK Member
 
Join Date: Jan 2008
Posts: 15
It's chassis CTC140.
Model F313255B.
The thing that happened with the degausser -- I'm
ashamed to admit -- I have a long wooden dowel that
I use to push on the white ceramic obelisk resistor to
re-set the TV when it goes into its switching on and off
hysteresis. I was a bit careless the other day, when the
set did this for the first time in many months and the
dowel slipped off and hit something on the circuit board
behind the resistor -- further toward th middle and under
the picture tube somewhat. I think it was the thermistor
because an orange glow briefly appeared from the spot I
hit and then the set was on normally. I often have to
repeat the punching procedure and this was one of those
times. The next time I clicked the TV on, I saw a white
spark come from a region slightly more outboard from the
place I hit -- more in the high voltage area. The TV came
on normally and worked all day. The next morning, I turned on the set and a zapping/crackling sound came
from the TV and the picture came on with the magnetized
magenta frame around a green oval that I described.
After that, the degausser never made the deep thump
when it switched on, so I'm thinking that a capacitor or
other high-voltage assist died in the flash of light that I
saw the previous day. So I've unplugged the degausser
because it makes a mess of the picture after I've done the
best I can to hand-demagnetize the screen. I found an old
bulk eraser for tapes tucked away and it does pretty well.
Its problem is that it isn't a big enough field for such a
large tube, so the bottom corners stay pink when the rest
is clear. I think they might age back to normal with time
and besides most programming on the DTV is 16x9,
where the bottom of the tube is idle anyway.
I am not confident enough of my ability to solder such
tiny parts to take the set apart, so I might just leave it
alone. I still love the old set for its color fidelity...
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