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tried with other ac outlet doesn't work?. if still won't turn on, at this time you will need to remove the rear cover to gain access the internal part. since your tv doesn't have any power indicator, the first place to be checked will be the power supply board this is where the power connector cord is connected. now look for a blown fuse replaced with the same rating. but take note before you replaced the bad fuse you must need to have component testing in the power supply board which the cause of blown of the fuse. like shorted bridge diode, open resistance and defective mosfet or bad regulator ic.at this time you will need a device called digital tester to check weather the parts need replacement.hope this can help good luck.
You will need to complete a channel scan from the tvs menu. I assume you have basic cable and that your cable company is still providing analog channels for you to be able to pick up any transmission on this telvision with the digital changeover and all.
A DTV converter box will take digital broadcast signals from the antenna and convert them to a format compatible with the VCR. You will be able to record programs received through the DTV box on your VCR if you could record analog over-the-air programs before the digital changeover. You can use either the RF output or the component output from the DTV box to input to the VCR.
The changeover should not show up this way. Also, the changeover only effected those that use an external antenna. If you have cable or satelite, the changeover should not have effected you at all. If the set is no longer under warranty, you could check for poor solder connections. These tend to be effected by heat. Have you noticed any particular pattern to when the sound goes off? In other words, does the set need to be in use for a long time before the sound cuts out?
Please update this and we'll look further.
If the unit is still under warranty, report the problem as an intermittant one. That way if not completely resolved within the warranty period, the "problem" should be covered anyway.
The conversion to digital affects off air reception. Since you have Comcast analog cable, you will not be affected until Comcast decides to discontinue analog cable, which is not likely any time soon. When that day comes, your old VCR will probably grace a landfill anyhow, and you will need a converter box from Comcast.