My new 55in sanyo lcd tv has sound but no picture. The tv is one week old. Is the problem the backlight or something else?

There is no picture tube in a modern flat screen TV.
And unless it's physically broken, it's usually something else that has failed and not the screen.
A picture tube is a CRT (cathode ray tube) that sends electrons from the back to the front to light up different color phosphorous dots.
A modern flat screen TV on the other hand is LCD (liquid crystal display) that turns on and off to allow backlighting through multi colored filters. (LED TV also uses a LCD screen, the only difference is the backlighting is LED and not fluorescent lamps.)

jvc tv backlight Questions & Answers - Fixya

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Get free help, tips & support from top experts on jvc tv backlight related issues. ...JVC LT-40SX6AT flat screen. Was watching TV ... ...jvc logo, has sound but nopicture Backlight is defective. I suggest ... Question about LT-42E910 42" LCD TV.

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Must See TV FIX EASY COMMON Samsung TV Repair Repairing LNT LCD ... LNT KDL Sanyo ln FLATSCREEN TV REPAIR FLAT SCREEN FIX - Hear Clicking .... i have a JVC LT42E910 WITH a cracked screen. there are all these color .... Vizio LCD Powers on with backlight, Wont power off, No video ...

This is not a user repairable fault. Should be checked from its main power regulator board, and is a skilled work. Actually this is a repairable fault, but can do only by any technicain.

Check your power outlet for any loose contacts. Look for any loose contacts in RC jacks/sockets/Cable. Try changing the input device to something you are sure, works such as a DVD player.

Show a torch light (flashlight) on the screen from a safe distance, when program runs. If you can see the picture, the problem is with the backlight and might require the attention of a qualified service technician.

This may be normal if using a cable or sat box.

0ne of 3 has failed:
(in order of probability):

1. Backlight inverter
2. Power Supply
3. Backlight

Please seek the expertise of an experienced TV repair technician - as they contain potentially lethal voltages that must be properly discharged before work can begin.

Thanks! ! ! !

Tv turn now,have a flashes of picture a few sec.than dies have sound left only?Yes,than ur tv have a 2 long boards are dead that call LCD inverter boards.These 2 long LCD inverter boards help the LCD screen to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 long refurbishes LCD inverter boards for the replacement.

It sounds like the color wheel has gone bad and needs to be replaced. This is located behind the back panel... replacing a new colour wheel will solve ur problem

thank u

change your backlight inverter

Sounds like one of the CCFL's is failing.. (Backlight bulbs).. Some use multiples and others have singular.