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Sounds like main board fault. Its main system control memory and its SMPS section circuits should be troubleshooted. Contact any service technician. It will be the best. 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/
It's October 2012 and I have a problem with my exact same model of JVC TV which has worked fine since i bought it in January. In fact it has worked the best out of the four that we have in the house working off the same aerial until 4 days ago. I tried retuneing and then the problem expanded to more channels. I tried to reset to factory options and then do a retune but lost all the channels. I have again reset and retuned and I'm back with channels that I can only tune into for between 4 and 15 seconds before the screen goes blank. None of the other televisions are affected. Digital UK website show no works to transmitters in our area and JVC are impossible to contact. Their site sends one around in circles in a most frustrating and unhelpful way. I will not be buying JVC again. Any help offered would be gratefully accepted!
Hello Check whether any control buttons on the front panel of the TV is strucked or not. It is best to replace all microswitches of the front panel of your tv. You have to open your tV and detach the control panel printed circuit board, desolder out one microswitch among them for a sample, and go to buy a new one. Replace all the switches at the same time. It won't cost more. They are very cheap to buy. You can bought it from most of the electronic spare part selling shops at your town. OK.
some tv's default to channel 2 after being unplugged.since it is a older tv ,the buttons on the remote and the tv maybe worn down.on the tv itself try pushing the buttons down a liitle harder. if you have aux or line in/video inputs,scroll down on the channel button to log into a aux channel for the dvd player.as for the remote try buying a cheap universal remote to see if that works.
You might consider using Best Buy's "Geek Squad" just to make sure the set is not a dud. I'm sure if it's near to the 30 days, they would be real schmucks not to replace it. But, maybe it's just a setting somewhere in a menu. Have a good look at the manual with a beer, and I'm sure you will find something useful.
I will tell you that westinghouse is the worst company among other brands. If you have warranty, return it and buy a sony or panasonic with a little extra money. It will help you later from buying another TV that is also as crappy as westinghouse's.
You said around 4pm TV is switched on everyday. Check in menu options any on-timer and off-timer is changed. If it is not there is a problem in microprocessor section. EEPROM ic malfunction also shows these type of symptoms. But it can be done by Technical persons only. This is not a major problem. This is due to surge current and lightening like that.