I have a ten year old Sony Trinitron that has suddenly developed a color
problem. The color all of a sudden changed to mainly green and pink. No
adjustment brings it back to normal. A friend told me a color gun failed.
Might this be so? Can a repair be done reasonably?
Your friend is right. The tube is more or less shot. Given that a BIG set
was 27" when you bought that unit 10 years ago, you can find an equal or
better new one for less than it will cost to have the tube replaced.
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Probably the BLUE driver transistor went out on the video board.
Easy to fix for someone that's knows how to solder and is experienced
in this sort of thing. If not.....I don't recommend getting getting inside
of a TV.
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Your friend has mentioned one part of dozens that could cause the problems
you describe. Do you repair your car by randomly replacing components till
it is repaired? Don't do the same w/ a TV. It'll be chaper to replace it
four times over if you use that approach.
Try sci.electronics.repair; do a google search for 'sci.electronics.repair faq'
It's about average, but if you know how to make simple repairs it's
probably barely middle aged. And Japanese TVs that old tend to be of
better quality than newer ones, especially in the durability of the
picture tube (I have some over 25 years old, still bright and sharp).
It's possible, but picture tubes can sometimes be fixed by burning off
shorts with a special machine (www.sencore.com can explain this) or by
isolating the cathode heater. But the problem may not be in the tube
itself but in the video amplifier, especially the part on the small
circuit board that plugs into the end of the picture tube. It may
have developed a bad solder joint, burned out resistor, or shorted
transistor, and the socket holes may have loosened from the picture
tube pins that plug into them because they get hot enough to turn
blue. Sometimes just unplugging and reseating this circuit board will
fix the problem, but don't do this unless you know how because the
board is often glued to the tube, and cutting through the glue can
scratch the picture tube glass and cause the tube to break and then
violently implode then explode. One technician reported that when his
tube did this it shot a piece of metal across the room that embedded
itself into the wall. When the AC cord is unplugged, broken glass can
be a bigger hazard than electrocution, and TVs can easily tip forward
because they're very heavy at the front, especially flat tubes and
Trinitrons. Also you can get shocked even with the AC unplugged
because the picture tube retains high voltage, so don't play with the
suction cup attached to the side of the picture tube with the thick
cable going to it.
If you're thinking of fixing this yourself, try to find a Sony manual,
either one that covers all Sonys or one specifically for your model,
such as a Sams Photofact (some libraries have them). Don't play with
the internal adjustments because some affect voltages and can cause
damage or shutdown or, more likely, just create a mess that's hard to
undo. Always mark any controls before adjusting them, and perform
adjustments only with all-plastic rods made for high voltage, not with
screwdrivers covered with electrical tape.
It's possible that your TV can be fixed for about $100, but be careful
because some shops are so bad that they'd have to improve to become
completely incompetent. Generally, shops that have been around for a
long time and that have employees who've been working for a long time
are the best, especially if it's full of cigarette smoke. Beware of
any shop where everybody is young, not because youth is bad but
because it's a sign that management is too cheap to pay for anybody
but entry-level people.
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