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Hello, I have exactly the same problem with the exact same TV, white screen for about 15 minutes and than image appears perfect as if nothing happened. I have asked an ebayer which sells TV parts and he suggested it could be a main board or tcon board. I am quiet hesitant to fix my tv, but if the tcon board would fix it, i'd go for it. Did You manage to solve the problem yet?
Tv turn on now,u just get a flashes of a picture only a few sec. than dies and have sound left only?Yes,than those 2 long boards that call the LCD inverter boards are dead.These 2 long LCD inverter boards job are to help the LCD picture screen panel to have a backlight to produced the picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 refurbishes long LCD inverter boards for the replacement.
If you are using a set top box this might be caused by turnig the box on at the same tie as you turn the tv on or slightly after you turn the tv on. If you are using compnent or HDMI inputs the set needs to see the signal as it is turned on to know what formt the signal is in.
These are the answers straight from the dell manual.
Ensure that the audio cables are firmly connected to both the audio input connectors on your LCD TV and audio output connectors on your PC or Video player.
If on certain TV channels you receive a picture but no sound, this means that you do not have the correct TV system. Modify the SYSTEM setting.
Check if TV volume is turn off of muted
Connect the audio cable securely
Audio cable is connected incorrectly
Verify that the audio source is selected correctly in the OSD