I have a RCA TV model # 27V512T set comes on picture and sound ok for about 3 seconds then it shuts down. For the past 3 or 4 months if I would turn on 20 to 30 times it would come on and work fine until it was shut off but now won't stay on now. I do have a technical background and used to repair TV's but that was a along time ago, any help would be greatly appreciated. Thanks Mike

SOURCE: RCA 20f510td

Sounds like a thermal breakdown of a componet. it could be in the main power supply regulaor supply or even a bad capacitor in the power or sweep supply. In some cases Zener diodes can break down and change values after warm up. In some cases also bad solder connections in the highvoltage section, or the power supply can cause this problem. It is a hard call without being able to look at the set. Just a few leads on where to go first. most likly a combo unit, such as this one , would cost you more then a new one these days. Good Luck PS Please dont forget to rate this thread.

SOURCE: Hitachi 50EX20B Bigscreen TV

You can download a PDF from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=50EX20B Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck

Service Manual 50EX20B

servicemanuals.net

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SOURCE: TV Shuts off

The most common cause for what you are seeing is a shorted gun in the picture tube. When 2 elements (heater and cathode) of one of the guns inside the neck of the picture tube touch, that gun goes full on and overloads the flyback (high voltage) transformer. If it is in the blue gun, the screen will go bright blue with light blue "retrace" lines in it. The computer senses the overload and shuts the set off. At 2 years old the tech most likely tried removing the short by arcing between the elements. This works sometimes but the short often comes back a few months later. Another attempt at removing the short could be tried, and it might work this time, but it may or may not work for long. The ony other solution is to replace the picture tube but that would cost much more than the set is worth. A qualified tech will be able to tell you if this is the problem in your set.

SOURCE: H.V shuts down/

try to check a bad conections in hv transformer and capacitor around them

SOURCE: NO POWER, PICTURE, OR SOUND, power button flashes green 2-3 times

had same problem. update tv software with a usb drive. do not take the tv apart. its easy download to computer unzip to usb drive and put drive in right side of tvs usb slot with power off, then turn power on, you should get an update screen.
did not work for me the first time i had to format usb drive to fat (not fat32) and then unziped to the drive took 10 minutes to update. I have tv 60PP9200D/37