Samsung 450 tv will not power up/on red light blinking constant

SOURCE: Blinking red light, doesn't turn on Philips 32".

count the blinks from the red led this number will tell you the stage of the poss fault

SOURCE: power light blinks red, TV doesn't turn on

if you are not technical i sugest you have this checked out by a professional most probably a fuse has gone from iside or your driver board has gone down. The blinking should be normal after you have turneds it off because some capacitors will be discharging.

SOURCE: Samsung ltm1555B - lcd tv blinking on button

I am having the same problem with the blinking orange light

SOURCE: won't respond to volume or channel changes red light blinks 20x's when turned off.

It's definitely a firmware problem. I called Panasonic and they were very polite about the entire situation and sent me a SD card with the firmware update. If you don't have time and you're tired of listening to tv at the same volume there is a way to do a hard reset.

I figured that unplugging the unit would do this, but there is one other step that you have to do to ensure that this works.

Generally the power button on the tv is always in the "on" position, this is what allows the remote to work. In order to do a hard reset the on/off button must be in the off position. Make sure that is off, then unplug the unit, let it sit there for a minute or two and plug it back in. If the tv comes back on as soon as you plug it back into the wall/powerstrip then the button was not in the off position.

This isn't the best fix, you'll still need to get the firmware update but it will at least give you the ability to use your tv normally....well until it decides to randomly lock up on you again and you have to do this all over.

SOURCE: Power light blinking 2 times

2 blinks means the unit is having problem with 12 volt supply.
while power on you can check 12DC on power supply before shutdown.if the voltage is constant before shut down I would recommend to replace D board.