There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.
SOURCE: help rca 46inch
I have the same problem using HDMI cable, I was able to get it working using composite or RCA
cables. I still cant get it working on none of the 3 hdmi inputs
SOURCE: have a 42 in rca lcd tv ,hsound but no picture
IF the set is under warranty, you should return it.
Do this to see if your set is "sending" the image to the LCD panel.
1) What the set on take a bright flashlight and press it against the screen.
2) Look for the "image" moving around the edge of the flashlight.
3) If you see the "image" then the problem is in the inverter/CCLT or the power to it.
4) If you do not see the "image", you should look at the LCD controller(TCON) for the problem.
SOURCE: Insignia 42 LCD TV Blurry Picture. Computer
tuner is going bad use a cable box that has hdmi or component video to bypass the tvx tuner
SOURCE: no picture on vizio 42
There are several boards that can cause what you describe. Can you bring up the menu? If so that will help in the process of elimination. Is there sound? What is the model number? Have you unplugged the set for a few minutes? If you are trying to decide whether to repair or replace. If any of the boards need replacing 250.00 to 500.00 for a shop repair.
SOURCE: 42" LCD tv shows picture on only half of the screen,other half dark!
The T-Con board (otherwise known as LVDS) connects to two seperste parts of the LCD panel. If you do have half a picture (left or right) replacing the T-Con board should resolve this issue. Open your TV, find the part number and search on eBay or at sites like www.flattvparts.co.uk where you can search by TV model number.
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