How old is your TV? If its more than six months old it more than likely has a thermal problem. This results from the fact that all lcd and plazma tvs never entirely power down and after six months or so depending on the model if they are suddenly devoid of power for even one hour they may not turn back on.
The power boards have a tendency to warp slightly after a period of time and after an hour or so with no power they shrink back do to contraction. As stupid as this sounds if your moderately mechanicaly inclined then remove the back cover and stand being careful not to scratch the screen. Get an ordinary hair dryer and without removing th RF shield ( metal cover ) gently heat the power supply till its hot enough to be uncomfortable to the touch. then try the power again. This should work temporarily
and isolate the problem. Good luck.
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have u made sure that the out let has power yet? if not check fuse box. next, if has power to outlet, manually press power button not remote controll, after it has been unplugged for some time. view the back pannel of tv. and see if there is a fuse or fuse notification. follow manufactuar or owners manual instructions from here, google vizio support or call 888 849 4623 with model and info ready
If your TV has a reset switch on the back, use it. If not, Unplug the TV, hold the power button down for 30 seconds, let it go and remain unplugged for another 5 minutes or so.
Plug it back in, and see what happens. Try changing the inputs/channels/etc to see what happens. If you're still having this issue, Take your TV in for repair.
- Sidenote, a $25 power bar with built in protection curcuits are the easiest way to protect your equipment from this kind of thing, and quite a bit cheaper than forking over $300 for a new TV everytime there's thinder and lighting.
Tries unplug,replug both tv and cables or satalites boxes an hour later.Tv should reset it self back to factory,pay boxes upgrade it softwares.The tv should work,back to normal.Not, take another tv test that incomming brocasting signal cable.If the incomming brocasting signal is good.Than the tv Tuner board is dead.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner board for the replacement.
To reset it you need to have it unplugged for about an hour, the sleep timer can be turn off.
How does the power supply look? no sign of bad caps and the voltages are OK. This can be the symptom of bad power supply or the main board EPROM got scrambled.
Unplug TV set from the outlet, wait 30 seconds, plug it back in, select right input with your remote if you using cable box or Punch the channel that you want to watch if you have cable service connected directly to the TV.
I think you are looking at a power board problem. I had the same thing happen to a Vizio and I replaced the power board and it solved the problem. It could also be the input board but most likely the power board.
Although not a great solutin it does allow me to use my fairly new and expensive LCD TV. Heres what I do, UNPLUG THE TV FOR 20 -30 MINUTES, WHEN PLUGGED BACK IN YOU NEED TO VERY QUICKLY PUSH THE POWER BUTTON ON THE TV.
Let e know if this works fo you.
Try resetting the TV by holding down the "up" button on the remote (with the TV powered on) and then, while you hold down the up button on the remote, hit the power button on the TV. This should do a "factory reset" which will wipe all settings in the TV. There is no reason why the TV should not "remember the last input it was on when it was ;last turned off. Also be sure that the TV is not plugged into a switched AC outlet, like the outlet on the back of the cable bix. The TV should be plugged into an output that receives power at all times.