Question about Flat Panel Televisions
On my sony lcd tv that i have the top half of the screen seems to be much darker than the bottom half. I have tried resetting the settings, and adjusting the contrast all the way up. I also noticed that the when adjusting the screen pic it will sometimes staticy/flickery on the edge. Almost like the graphics driver for the lcd is going bad, like a bad video card in a computer. I know alot about desktops/laptop computers, but the insides of an lcd tv i am more or less clueless overall.
Any help would be great appreciated
The problem is most likley the TV backlight - it is very unlikley to be the graphics card or video input or any other circuitry within the TV.
Also, the problem can be manifested by flashing or flickering of one or both halves of the screen, and sometimes it is a left/right split rather than a top/bottom split, depending on where the lights are positioned. Before failure, you sometimes hear a very high frequency buzz for a few weeks before it fails - the frequency can't be heard by most adults as it ranges from 15kHz-25kHz, but children\animals can usually hear it.
Generally you will need to replace the backlight tube or the invertor that drives it. Generally you can identify the backlights as thin glass tubes buried deep within the panel itself usually with one wire going to each end of them - they are very fragile. The invertor is connected to the backlight tube and looks like a circuit board, often containing a high voltage warning. Usually there are two or four conductors connecting the invertor to the tubes, which can be identified as thicker individual wires as opposed to the flat ribbon wire used for data for the actual image displayed on the screen.
On some screens you may be able to unplug\swap one or both tubes to identify if it's the tube or inverter.
Posted on May 03, 2009
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