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Topic:
Help needed from Sony TV/DSS experts...
This thread has 9 replies. Displaying all posts.
Post 1 made on Sunday February 20, 2000 at 23:23
Bob
Historic Forum Post
Last night I heard a loud snap while reading the paper and when I looked up I noticed a very thin (1/4") blue "hue" at the bottom center of the picture on my brand new Sony TV. The movie was mostly in a dark setting (Rambo). This blue hue now shows up randomly in dark settings - but only when using my Sony DSS receiver - never on cable. None of the TV settings (color, brightness, etc) are set at more than 50%.

Has anybody ever witnessed a blue "hue" randomly sneaking into the bottom of a picture before? I'm wondering if the snap I heard was something that blew in my DSS receiver or TV. Or if maybe I just never noticed the mysterious blue "hue" before.

The reason this concerns me (aside from the obvious) is that I've been having trouble with this new 32" Sony TV and the old Sony DSS (SAT-B1) receiver regarding digital artifacts. I never had them before with my Sony 27". I'm beginning to wonder if there is some kind of compatibility problem between the two units (ground loops or some other strange anomaly)

All responses appreciated....

Bob
OP | Post 2 made on Monday February 21, 2000 at 18:06
Bob
Historic Forum Post
One other important thing I've noticed...

The "blue hue/bleed" shows up EVERY time the screen goes black between commercials - and then usually disappears the second the picture (re)appears.

BTW, there are no magnetic sources near the TV.

Bob
OP | Post 3 made on Tuesday February 22, 2000 at 00:28
David B.
Historic Forum Post
This is just a guess...

The number of horizontal lines cableTV, broadcast channels, and VCR's put out is fewer than what DSS or DVD's put out typically. The TV is smart enough to display as many as the signal contains. So the reason you only see the blue bleed when using your SAT is that the sat's signal is making the TV show more picture, and the flaw is at the extreme of the TVs higher resolution ability.

My guess is that your TV's scanning circuitry is flawed or slighly broken. I'd suggest trying the DSS on another monitor. If the blue doesn't show up on your old TV, and you can see the same "bottom edge" of the DSS picture, then the flaw is with the new TV.

I'd get them to service it. Take advantage of the warranty.

Just a guess.

Dave
OP | Post 4 made on Tuesday February 22, 2000 at 09:12
jazzly
Historic Forum Post
Also just a guess...

Sounds like a flyback transformer discharge.This can happen in dry environments. This action
might have magnetized part of the tube. I might
suggest unplugging both units for 3 or 4 hours. Sometimes static/magnetic buildup can be drained off
with this method. Since most newer sets have auto-
deguassing circuitry, I don't think a manual deguass
would help.
OP | Post 5 made on Tuesday February 22, 2000 at 18:00
Bob
Historic Forum Post
Jazzly and Dave...

Thanks so much for the responses. Jazzly - it is REAL interesting that you mention the flyback transformer! Something I did not mention was this new TV is making a real strange sequence of small popping noises when I turn it off. Although some (not all) others in the store did the same, none were anywhere near as loud (you can hear mine across the room - albeit faint). I am now wondering if in fact the blue bleed problem may be exactly as you describe - and is realted to the "faulty/flaky" sounding flyback transfomer. I can return the TV for another new one as I am in the 30 day warranty period, but I was hoping to avoid the headache unless necessary.

Sounds like maybe I should return it after all, huh?

Any more "testing/debugging" techniques you may have would be greatly appreciated.

Again thanks,

Bob
OP | Post 6 made on Wednesday February 23, 2000 at 09:05
jazzly
Historic Forum Post
I think returning it may be a good idea. The noises you hear when you turn the unit off may be normal. It should sound like static between two sheets when you remove them from the dryer. Part of this is the auto deguass circuit I mentioned. Sometimes a snap like you mentioned is caused by a particle of dust. Ocassionally
this may only happen once. If the tube is still showing a color bleed, I would return it as it is most likely that the problem will show up again. Good luck!
OP | Post 7 made on Friday February 25, 2000 at 14:45
Bob (Jazzly please read...)
Historic Forum Post
Jazzly,

Update...

I got to thinking that I need to rule out the DSS receiver in the equation, so I went to the store where I purchased the TV and brought home a demo Sony B-3 DSS unit. Well, the blue bleed problems went away. It appears the problem is my old Sony SAT-B1 receiver! It may have been there from the start - just could never see it on my previous 27" TV. I have connected other TV's as a test recently and saw no problems, but the test TV's did not show as much picture so the blue bleed wouldn't have showed up anyway. I believe (hope) my TV is okay, and now plan on replacing my DSS receiver. I am guessing that the Sony 32" shows a much larger image so any flaw on the "perimiter" of the signal can be seen.

Make sense? Any thoughts?

Thanks,

Bob
OP | Post 8 made on Friday February 25, 2000 at 15:09
jazzly
Historic Forum Post
Was the receiver on top of the tv or just below it? Still sounds like a static or magnetic problem if the flyback is ruled out. On the other hand the video out of the receiver may have been damaged when an arc discharged in the TV. I've seen this happen before. Is your system in a dry area? Might want to consider picking up some anti static spray for the carpet or maybe a humidifer. Glad you found the problem! Much cheaper than the TV! And lighter too!! Best of luck!
OP | Post 9 made on Friday February 25, 2000 at 23:38
Bob
Historic Forum Post
Jazzly,

The DSS receiver is located about 1 foot to the right of the base of the TV. The DSS receiver actually goes through a Sony pro-logic amp/tuner for video switching before going into the TV. But the tuner isn't part of the problem - I've bypassed it and still the same problem.

I live a very humid environment, however I must say that for the last few weeks it has been very dry.

What you explain certainly seems to make sense - but I have two questions in that regard:
1) Would the arc theory still apply given the tuner is in between the TV and DSS?
2) Is the suspected arc a one-time (or at least rare) event, or should I be concerned and consider returning the TV to prevent futher damage to my other equipment?

Lastly, I'm still not sure if the blue bleed is a result of the DSS alone, or if the TV's picture is also contributing by being "out of alignment" - maybe it is showing too much of the bottom of the picture and thereby exhibiting the blue bleed on occassion?

This really stinks - it is difficult to be sure of what is really going on and what component is at fault. But I must say, your arc theory makes the most sense so far.

Again thanks,

Bob
OP | Post 10 made on Monday February 28, 2000 at 09:13
jazzly
Historic Forum Post
Many years ago I purchased a TV that made a snapping noise a couple of times and then was just fine for 12 years! If the picture is good and you hear no more snapping, I would say that it was an isolated incident. Not to worry. You have a year warranty on the set, I believe. Good luck!


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