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I have a Toshiba 42inch LCD TV, model # 42LX196 that is just a little over a year old. The picture went out suddenly, and would only come back after unplugging and re-plugging in the TV. This happened several times over a couple of weeks until it now will not come on at all. We still get sound, but no picture. (It's the same from the DVD player and Wii, which are on different inputs.) We had a Sears repair person come out, and he indicated that the "display was bad", but he did not open the TV or check anything with instruments; that was his opinion based on observation. He may be right, but I would like a second opinion before chucking a $2000 TV we just bought a little over a year ago. Thanks.

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Hi,

Based on your post/description, your first step probably would be to determine the TV's fault: backlight, video, LCD panel or something else

All LCD TVs uses several CCFLamps as backlight. These are similar to the household tube florescent lamps. They are however powered by an inverter rather than the mains. To be able to determine if your backlight (or the inverter) is defective, you need to run the TV normally (albeit you can't see anything). Play a DVD or something. Get hold of a flashlight. Increase/Press the volume control of the TV (remote or panel) while shining the flashlight on the portion where you normally see the volume level indicator. Angle the flashlight obliquely to the surface of the display. Try to see if you can see some semblance of the volume level. it would probably be of help if the room is darkened a bit.

If you can see the volume level indicator, then your TV's problem is with the backlight and/or the inverter. Since you have a 42 inch, chances are your unit do have several lamps inside and very rarely (if ever) does it happen that all go dead at the same time. That would leave us with the inverter which is a high frequency high voltage power supply that provide the juice for the CCFLamps.

To check and repair the inverter, you need to be comfortable and familiar with electronic circuitry/components, use of a DVM< and a soldering iron. You need to check if DC voltage is coming in and high freq/high ACV is coming out. More often, inverter problems are overheated capacitors which would be indicated with blistered tops of the capacitor can.

IF on the other hand there is no dim image of the volume control level using the flashlight, then the issue could either be the video processor or the LCD panel itself.

The above of course would require that you open the LCD TV and do diagnosis/voltage checks of a live set.

If you are not comfortable with this, perhaps you would be better off seeking the services of a qualified professional.

Offhand, if the problem is with the CCFLamp, inverter, or video processor then it might still be worth having it repaired. If it were the screen, perhaps you have to consider the downtime and cost of repair.

Another consideration would be to find a tech who would be willing to do component level repair rather than board replacement.

Hope that this be of help/idea. Pls post back how things worked out or should you need additional information.

Good luck and kind regards.

Posted on Jan 18, 2008

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I think you should call Toshiba and ask them for assistance. I am no expert on TV's, but i think that would be your best bet on how to repair and found out what happened to your TV. Call them at 1-800-631-3811. Hope this helps. :)

Posted on Jan 18, 2008

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