Help why is my plasma powering up but no picture and a few seconds later shuts offf?

A component in the TV is failing and is not receiving correct voltage, which is causing the TV to enter " protection mode" and shut off. Could be any part of the TV but I would start with the power supply and go from there.

For more info post the model number of your TV

Here is some basic info on testing the power supply.
TV Power supply general info

These usually have a good Warranty as this is a Best Buy product. They would be sure to fix it under the waranty if you take it in. They would be able to give you an estimate of repair if you take it in also. They may have a flat fix fee or possibly an hourly fee along with what the power supply or bad part cost.
Usually a power supply problem. 42" is still an expensive TV to replace. May be best to repair.
Blessings,
A/V Guy

I have LCD AKAI TV , It shuted down and no picture . Power never changes from red to green when I press remote control or standby button.

Yes, you are correct. there are a few component issues on the power circuit board that will need to be replaced. the mani component will be the capacitors and transistors.if not repaired soon, this unit will completely stop working.

It related with Power Board(50%) or Y-Main(50%).
But, if you use the power bar with surge protacton, need to check
the power bar's lamp when the TV is turning on & off.

You need to get this tv service asap.i beleive that the problem is in the inverter board or yb board.


good luck

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yes,veryry possible you have a bad transister on the power supply board .best way to fix it is to change the hole board.

4 inch multi color strip in middle of picture?

Yesterday it was looking my lcd sony then still has me without image and leaves the green lamp chimney me of power flushedly(passionate) extinguish it i it has not wanted to ignite mas that I can do

update: Well, we ended up calling the repair man and we had a bad Y-sustain board and also a bad Z-sustain board. According to the guy who fixed it, it was due to over use of the TV and using main power button instead of shutting off through the cable remote. 650.00 later and a few weeks later, we now have a fixed plasma. No real suggestions on how to get more life out of the new boards.