Your reported symptoms are odd in that most failures are related to the primary power supply but that takes down both audio and video.
The backlight is obviously working (white screen) but it is no longer receiving any video information and this points to a failure of the logic (or the output of the power supply that services logic) used to control pixels on the screen.
Some screens have the majority of the control ICs actually mounted on the LCD assembly and because of very close pin distances used on dense ICs, they are often not replaceable by hand since they were installed by robotics.
I would first suspect (and hope for) the logic voltage output of the power supply to be the culprit.
If any of you posters have had a repair done and received any kind of a detailed report (you should), would you be kind enough to post it back as a comment to this original message?
or are you just telling us that the volume won't go up?
Modern TV's are digital computers
So, the volume buttons don't actually turn up & down like in the past.
The internal computer gets up/down values from a register. Then it performs the change to the Amplifier.
SO... the point is
A technician needs to look at it unless you are technically inclined to check the power supply for say "Bulging Electrolytic Capacitors".
There is no excuse to hold someone's gear hostage for a half-year.
I hope for your sake that it was a 'factory authorized' service org.
If is was, contact Sanyo and raise Cain about it; this set seems to have way more problems than is common for the brand.
Sanyo Contact info
The main system control memory IC is faulty. Replace it, and initialize the memory data to it. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Time slide, can be selected by the drop-down list, at the top left
of the display window, will make surf easy. You can also do a search, by type in the brand name/model
number/IC used, in the search box at the top right of the display window.
Hey Bobby, even though local channels for most places switched from analog to digital you still need an antenna. A digital antenna to be more precise. Advice: don't just get a digital antenna box, look for one that has an antenna on it. You can get some for $50 that will provide crystal clear picture. Speaking from experience. I hope this helps. Good luck. - Joe
THIS HAPPEND TO ME BEFORE MAKE SURE ALL OF YOUR LIKE SKY CABLES OR DVD SCART LEADS ARE FULLY CONNECTED TO THE TV ANF HAVE NO TEARS OR RIPS ON THE CABLE AND ALSO MAKE SURE THAT THE TV IS ON THE RIGHT AV CHANNEL BECAUSE YOU COULD HAVE CHANGED THE AV REALLY EASILY BY MISTAKE
It sounds that the main digital board to your TV has damaged. But, before make it confirm, a through check should be done. Contact any experienced service technician for help. The work is skilled one, that a user cannot do it with ease.
No,Not repairable,because replacing the LCD screen panel itself,it will cost the same as a new tv.The LCD screen panel worth 90% of the tv,and it limited produced by the the tv corporations.Sorry the tv worth a whole tv anymore,only now worth a salvage tv electronic boards parts,that it.