I have a LG 42PB4D Plasma TV. For no known reason when powering up the power indicator light starts green, a Click occurs and the light goes back to Red. There is no response whatsoever from the screen itself

check for shorted components on YSus board and Y Driver boards (the boards on the left with the back off) This job is for a tech type person.

I would open back and check all boards for cracks, this is a problem with these sets.Then count the blinks on the set and see if it stops for a moment and starts back.

Hello,

Your power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
hope this helps...

If there is no LED burning to indicate there is power than the power supply is faulty.Repair is not verry easy to do with these complicated power supply's.

Hi Paul, This seems to be a common issue in most of the plasma flat screens. You are almost accurate in guessing the reason of trouble. The issue with the TV is mainly with the power board itself which happens in most models. Even though if you try replacing board level components you will finally end up in replacing the power board for sure. I managed to find a contact who can help with spare parts of most of the plasma models...i am posting it here for your reference. plasma TV parts-- Steve Hu: [email protected] .
Have a nice day!!!!

Try this:

In the menu go to CC and set the TV to CC1 as this is a text box appearing for captions. Hope this works!

Just fixed this problem. Turn TV off and unplug from wall, leave for 5 mins turn back on and picture back!

This worked for me too! THANKS

It is the power supply. Replace the C97, C19, and C16 Capacitors with 2.2 uF ones.