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Q: RGB Flicker -- Television set troubleshooting ( No Answer,   3 Comments )
Subject: RGB Flicker -- Television set troubleshooting
Category: Science > Technology
Asked by: hightechfool-ga
List Price: $8.00
Posted: 01 Aug 2006 20:38 PDT
Expires: 14 Aug 2006 11:56 PDT
Question ID: 751702
I've had my 30" widescreen television for 2 years now.  From the day I
got it...I've had an annoying problem with it.  It doesn't happen
often, and it's completely unpredictable (hence it is usually not
reproducable).  Luckily, I got a photo of the sharp RGB lines that
flicker across the screen.  It only happens when I play a DVD.  I know
this is probably an issue I need to have looked at by a pro...but I'm
reluctant to spend money on something like that until I'm sure whether
it's a problem with the
DVD player
or Monster Component Video connections!

Monster is an extremely reputable source for component connections so
it's just so hard for me to believe the cables are the problem. 
Anyway...enough of my rambling, check out the link below to see the
video problem I'm talking about!!
Please do some research and see if you can identify this specific anomaly  :(

Request for Question Clarification by cynthia-ga on 02 Aug 2006 00:09 PDT
Philips - Model number ...?
DVD Player, Brand & model number ...?

Request for Question Clarification by cynthia-ga on 02 Aug 2006 00:21 PDT
You're not alone, unless this is your post:

The GUEST post here, a sad repair/warranty story:
..."So I get my TV back. Occasionally while watching anything through
any input (HDMI, Component RGB, S-Video, etc.) it shows reg and green
lines, three of them, occasionally. Sometimes often, sometimes near
the top of the screen, sometimes rarely, but I see them..."

Sound familiar?

Clarification of Question by hightechfool-ga on 02 Aug 2006 11:13 PDT
I did not post that other problem..though it seems identical.  I'll
check on my model numbers asap!
There is no answer at this time.

Subject: Re: RGB Flicker -- Television set troubleshooting
From: stanmartin1952-ga on 02 Aug 2006 11:33 PDT
Sometimes when a tv isn't adjusted properly, you can see the scanning
lines returning to the top of the frame. Could you borrow another dvd
player to see if the problem occurs with that one as well? It doesn't
look anything like a cable problem.
Subject: Re: RGB Flicker -- Television set troubleshooting
From: hightechfool-ga on 02 Aug 2006 12:56 PDT
I was skeptical that it could be a problem with the TV
adjustment...though it sounds like you know it might be.  From the
above few comments it's starting to seem like it's the TV.  I'll try
to get my hands on a player (and maybe extra cables) to test it once
and for all
Subject: Re: RGB Flicker -- Television set troubleshooting
From: sorwin-ga on 02 Aug 2006 16:19 PDT
The three coloured lines are all sloping upwards, hence they certainly
occur during the vertical flyback period.

In my opinion this is caused by the DVD copy protection system
"Macrovision" (see Google) in combination with a sporadic failure of
the TV vertical blanking.

The way Macrovision works is to insert a full amplitude line (or
lines) during the vertical blanking period.  Television receivers are
normally unaffected by this peculiarity.  But VCR's and disc recorders
are severely disturbed by it, because they commonly use the vertical
blanking period in order to measure and adjust incoming video

So I think the problem lies with the television receiver.  But the
sporadic nature of the fault might make the precise diagnosis

John in London.

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