Tv neo tf 3708 lcd turn off by itself after 20-60 minut and go stand by.

Electronics can fail after they warm up. When they cool down again they start working again. The electronics need replacing, on this TV its cheaper to replace the TV.

Need to source this from the dealer if you need to mesh with the same type or you need to get one from any accessories shop.

The set has an internal fault and needs to be serviced

There are a few screws that will need to come out. Usually they are located in the back lower center of the television. where the stand meets the TV

Here is the link to the manual if you need further help

http://www.retrevo.com/support/Coby-TF-TV3217-TVs-manual/id/23498ag721/t/2/

Check your electrical outlet. We had same issue with a different brand TV and the electrical outlet was the issue. Hope this helps.

I would start by browsing Cobyusa.com otherwise try ebay there may be a scrap unit out there somewhere. Or, look at the label on the rear of the screen itself and Google the part number. Someone will have one.

The LCD inverter board is dead.That why u not getting a backlight to the LCD screen to get a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter for the replacement.It a long board.

Hi, Lamp of TV getting weaker and requires replacement. This shut off by itself will increase day by day until you put new lamp in TV. Always Buy Sony original lamp and avoid aftermarket/ cheap lamp for TV safety.

Go into your menu and navigate to find Closed Caption then turn it off. That should do it!!!! Read your manual also, it's possible you might have POP picture in which it displays multiple channels when you change it. That feature should also be in your manual.

I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
Solutions?
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps