Very bad symptom indeed.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations.
SOURCE: RCA Scenium: l5000yx1 - turns on and off by itself.
Mines did the same thing. I had to get a new bulb $200 on line and pay someone $200 more to fix some wires that had pulled apart when we changed out the light. But now it works great!
SOURCE: RCA 26" Flat Screen suddenly no picture
The T-con board has failed but i do not think that it is sold seperately you will have to have a tech check it out if your set is just over the warranty i would contact rca they may just pay for it
SOURCE: RCA L26WD21 No picture/white screen but still have sound
It sounds like the LCD controller board went out, look inside to see if the cable may have come off the LCD controller board. You can look and see what it looks like here: http://www.shopjimmy.com/catalogsearch/result/?q=RCA+L26WD21+
Please post back what you find.
SOURCE: we have had this tv for less tha three years and
Ur LCD backlight inverter board is dead.Replaced this inverter backlight board will get ur picture back.Tries Shopjimmy.com,Ebay.com to buy the refurbish LCD inverter backlight board.It a long board sharp.
SOURCE: RCA 37" FLAT SCREEN NON STOP FLICKERING/FLASHING SCREEN
you need to remove main ckt, (m.board) some part need to re solder specially in hot area. (lost contact i one of the flickering problem you encountered.
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