We have a Magnavox, 50 inch plasma TV, model 50MF231D/37. Recently when the TV is powered off and an attempt to power it back on again has been made, we get a red blinking light. The light blinks six times. We have unplugged the TV until the blinking stops and then are able to turn it on again, but I don't know what is causing the problem initially.

Check all the capacitors one might be bad find out if it is bad it should bulge on top of the capacitors

Power supply board is dead.Replaced the power supply board will solved this problems.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

First thing to try is replace any swollen capacitors on the power board.

You would be better off to have a shop check it out. Try unplugging it for a while just to reset everything.

Commonly it's going to be a power supply related problem. The two boards that need to be looked at is the Main Power Supply Board or the power supply board for the screen. The one that powers the screen, some manufactures call it a Backlight Inverter Board.
If you have some electronic experience, you can sometimes find a Service Manual for the TV over the internet for less than $20. It will have the all resource material for repairing your TV model. It's just the matter of replacing the bad part on the circuit board.

try shopjimmy.com

your problem is in the Y or Z sustain boards i just fixed one of this today with the same exact problem and i replaced  the Y sustain BINGO.
good luck 
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Switch off the surge protector for 2-3 minutes then switch back on and TV should work.

When you have the red light that blinks four times on the 50" Magnavox Plasma Model 50MF231D/37, you should look for the capacitors on the power board in the center of the of the TV. Look for two 3300uf, 10V, 105c capacitors that have a build up of pressure that has caused the top of the capacitor to look rounded instead of the flat top that will be on all of the other capacitors. Changing these two capacitors fixed the problem of the TV not coming on.
I had more trouble finding the capacitors than changing them. I could not find them locally so I went to an on-line electronics supply store where they were $1.65 each and $8.99 to ship.

get a new one it short circited when the power outage acured