when it shuts off are there any lights on the front that blink? if so what ones and how many time are they blinking?
it should blink 1-10 times and pause and then start over. if so how many times is the blink?
ok this is a issue inside the . can you use a meter to test with?
ok pull the back off and take a picture with the back off the tv. then use the paper clip button above to attach the picture.
check the marked connector for DC on each wire. use the metal on the back of the panel for ground
are you testing this while it is on for the 15-20 secs?
i need a picture of the back of the tv so i can see all the boards please
test connector marked in blue
ok if it is getting snow on the screen and you are showing no voltage going to the inverter then you must have a bad meter?? or you are checking this voltage after snow has left the screen?
pull the inverter board and look for bad connections on this board
ok this is either a bad inverter board or a bad LCD panel. there are no further checks we can do here for testing. woulld you like me to find you a inverter board for sale? and a part number?
you might want to check here for one.
they are a lot cheaper