Sony tube tv going bad?

Phil

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May 22, 2010, 1:35:32 PM5/22/10

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Hello:

This has not been a good week. Last week something killed my (14yo) gas range.
While baking dinner it made a loud snap/crack sound like a light bulb exploded
and stopped working. Clocks dead, ignitors for the stovetop and oven won't work.
Looks like I'll have to replace it.

Now last night our Sony 30" tube tv (aprox 7-9yo) started to act up. We were watching
a dvd when the picture went to black, but the sound was ok. I immediately thought it
was a defective DVD but that's not the case. I turned off the dvd player and tried to
watch some tv but had picture problems. As I flipped channels the picture would be ok
for half a second then go to half brightness, freaky colors and distorted image, then pitch
black. The aux inputs Video 1, Video 2, etc. also were effected. Turning the tv off for a
minute and then back on fixed it for a while then it happened again. The tv seems to be
working ok so far today. So, what do you think? Tuner crapping out or the picture tube
going? I thought the Sony Trinitron sets were long lived and pretty much trouble free...

Thanks, Phil

Meat Plow

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May 22, 2010, 3:19:35 PM5/22/10

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Sorry to read about your loss.

hr(bob) hofmann@att.net

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May 22, 2010, 4:13:38 PM5/22/10

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Sounds like the circuit that monitors the crt called the IK circuit or
something like that is cutting out the video because the circuit
thinks the CRT is going out of balance for the 3 guns.

William Sommerwerck

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May 23, 2010, 9:17:46 AM5/23/10

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> This has not been a good week. Last week something killed
> my (14yo) gas range. While baking dinner it made a loud
> snap/crack sound like a light bulb exploded and stopped
> working. Clocks dead, ignitors for the stovetop and oven
> won't work. Looks like I'll have to replace it.

I expect a range -- gas or electric -- to last at least 20 years, maybe 30.
This sounds like a power-supply problem that ought to be fixable -- though
whether it will be at a "reasonable" price, I don't know.

> So, what do you think? Tuner crapping out or the picture tube

> going? I thought the Sony Trinitron sets were long-lived and
> pretty much trouble free...

It /can't/ be the tuner, because the line-level inputs also have a problem.
My guess is the chroma chip, or some nearby component.

Sonys do seem to be reliable. My KV-1920 lasted more than 20 years (needing
only a $70 power-supply repair), and my current 400-series 36" flat-face is
almost 10 years old, with no problems.

b

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May 23, 2010, 4:05:56 PM5/23/10

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On May 22, 6:35 pm, P...@INVALID.com(Phil) wrote:
y. So, what do you think? Tuner crapping out or the picture tube
> going? I thought the Sony Trinitron sets were long lived and pretty much trouble free...
>
> Thanks, Phil

It's almost certainly not the tube, it's too sudden. I'd be looking on
the crt neckboard for cracked solder joints, and check the vicinity of
the line stage.
-B

William R. Walsh

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May 24, 2010, 1:23:00 AM5/24/10

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Hi!

> Looks like I'll have to replace it.

Why? A little investigation might reveal something very obvious, especially
if it made a loud noise. It could well have *been* a bulb exploding due to
age or something else. If it was on at the time, a failing bulb could have
blown an internal fuse or popped a circuit breaker.

Don't know what to tell you about the TV, but your range is very likely to
be fixable with some basic troubleshooting. It's worth a shot and will cost
less than replacment.

William