Television volume goes off constantly, sometimes after half an hour sometimes after 10 minutes, and at the same time unable to change channels or activate anything. After turning power off and on at the switch only does it work again.

replace the inverter board or power supply board

may be some thing is stuct on the controt pannel power button or others check. try this it may work

Reset the Directv box,by unplug it,replug it and hour later to let the last software to update.Replaced the HDMI cable,goto ur tv menu,goto sound functions,go down to reset it back to the factory setting.After this the the sound functions should be stable,and work.Not,than ur Tuner signal board have some kind of intermittion short in the board.Than must replaced the Tuner board to solved this problems.

I just had this problem with my 3 year old 32" Samsung LCD. The volume would go up and down by itself, normally just constantly going up even when it reached 100%.

I thought it might have something to do with the volume buttons on the TV itself so seeing as it was out of warranty anyway I decided to unplug it and open it up.

I gave it a good clean and I disconnected the cable for the panel of buttons on the LCD itself (volume, menu, channel etc) seeing as I never use them anyway. I then put everything else back together and tested.

It seems to be working fine now. Previously (for the past 3 hours) ever time I turned it on the volume level would come on instantly and stay on until I turned the TV off. So I’m quietly confident the problem has been fixed. But I must admit it’s only been 10 minutes, so who knows, it might come back.

try leaving the set unplugged for several hours, this will reset it to factory settings. If this does not work you need service.

Hi Paul,
It looks like your TV might have a main board failure if the screen stays white without video. Since your TV is less then a year, I would suggest to contact the manufacturers to get fix under warranty. Most electronics devices carry one year warranty.
Good Luck.

I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.

Found this on another site and it worked, had to switch back and forth a few times but it worked........

I have a Sharp LC-46D43U LCD TV. I think this is a entry level for large lcd tv's. With the volume all the way up at 60, my wife and I could barley hear the tv. I was playing around in the menu and some how have the volume at almost twice the volume. What I did was:
Go into the menu
Go to option
Go to output select
and change from fixed to variable and back to fixed. You may have to do this a few times.
Sometimes the volume goes loud after 1 try and sometimes it may take 10 or 20 tries.
But if I change any settings, even the channel sometimes the sound goes back down to where it was.
Has anyone done this, did it work for you. I don't know very much about electronics and I have now ideal why this happens.
I wonder if this is just something with my tv.

the high voltage supply for the lamp may have blown.
cheap bulbs don't always have the correct rating.
made in china?

You need to press the button on the top right of the control ( the TV button) once and that will allow you to control the tv once again. Problem occurs when you accidently push VCR or DVD button which means remote control will try a different frequency to operate a VCR or DVD that isn't there. Hope this helps.