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Topic: Bravia - Blue vertical lines on display
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Joined: Apr 15, 2013
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4 year old Sony Bravia has just begun displaying a pair of 1 pixel wide blue vertical lines until TV is warmer (about 15 to 20 minutes after being turned on) and then lines disappear and display is normal.
One line is dark blue, one lighter blue, a few pixels apart on left side only of display.

Wondering if the problem is LCD screen itself or a display logic board with IC's that are beginning to drift out of range (since lines go away after a short time) ?
Do these symptoms typically get progressively worse ?
ie- more lines, wider bands

I won't go beyond symptom description due to forum rules.
I'm in a region with little to no support.

Thanks !
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Joined: Apr 15, 2013
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Three days after the blue vertical line on screen issue appeared,
the TV now powers on with a normal 4:3 resolution TV picture and then powers off after a self test failure accompanied by a flashing power light at bottom right of the panel.

I'm now more convinced than ever a display or logic card is the problem and not the LCD panel itself.
Some component is out of range in power up self tests despite doing a settings reset per Sony's instructions. Tried unplugging TV and plugging it in again, but an internal battery may defeat doing this.
So the TV isn't useable anymore.

I was able to switch from TV input to an unused auxiliary input where the display won't power off, so at least I can access settings info from there and possibly input a tuner through a computer.

The TV wasn't handled or moved prior to problems starting, and there was no power outage or lightning in our area. The TV is also protected with a surge power bar so component values or default settings are the only possible causes of system power down.
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Joined: Mar 25, 2005
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My brother has a similar problem with his 52" Bravia, except that it's a red vertical line. But with his, the red line never disappears. I don't know what it could be though. He never had his checked out because the warranty was over.
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I did browse a few useful youtube videos, but unfortunately haven't found fixes for your brother's horizontal line problem.

The good news is that other than LCD screen and screen edge connections, everything else appears to be surprisingly serviceable. The inverter which converts 20 volts to 2000 volts for screen lighting requires that the unit be unplugged before disassembly.

If choosing to repair it yourself, I think it's really important the screen is not stressed with side or twisting forces of any kind.
Some DIY youtube attempts resulted in fatal cracked screens, with larger heavier displays especially. Handle the display like it is a very thin and heavy brittle piece of glass, and not a piece of plastic (as it can appear to be on the outer layer) and you should be OK.

Given potential risks of DIY repairs, I'm going to just live with the vertical lines issue for the time being, as long as the "shut off on startup" symptoms don't return.