Tv stays on for about 3 minutes the shuts off

It's probably Thermal Runaway' a term used when a electronic component over heats and quits working. Go to Radio Shack and buy a can of freeze spray, Take it down to where you can get to the chassis and when it goes out starting spraying components and when you get the right one the sound will pop back on/ This spray is not flammable and does not conduct electricty. That component will have to be replaced,

When it shuts off and the green power light goes off, press both the menu and input buttons on the front of the set (not the remote) and hold both for about five seconds and release.

Power light will blink a two digit error code like 2 blinks and then 3 blinks and repeat it several times.

What is the error code?

dvd is overheating its circuit. Keep the tray open to dry up condensation. then leave TV on standby to keep moisture out.

Make of the set and Model would help greatly.

check the fan to make is working properly. It's in the lamp compartment on the left side of the unit. clean the vent on the rear unit and the fan fin's gently. good luck

On your Deflection Board its the Bottom board to the left CK 3 capacitors cp150 2200uf 16v if it is puffed up on top it is Bad other 2 are cp114,cp120 220uf 35v

My Sylvania T.V. turns on and then it turns off by itself. It only stays on for onr minute.

the problem may be due to dry soldering in the power supply stage if it was with the lamp there would be red or green light showing the presence of the power to the tv after making it own some of the components get hot and it will make the the soldering point conectionless and after some time the heat sink get cooled and the soldering point gets connected and u will see the picture again it is a simple problem if u have a soldering iron u make it hot and re solder all the components in the first part of the circuit board and the problem if rectified