LCD TV won't turn on- power light flashing

Try to I unpluged the power, push volume and channel down, pluged power again

While it's flashing unplug your TV from the main power source for 15 seconds,Then press Valume Up and Channel Up, while holding it plug the TV back in, you should see the TV Turn on. How to Reset Your Sharp LCD TV TV Repair

check for a bad lamp then make sure the fan is working.

You either have a problem with your power supply board or main board. I would start with having the power supply fuse checked as well as the power supply board!

check some leak or bulged capacitors at the power supply board then replace it.

Toshiba Regza 37in - 37HL17
TV will not turn on - Yellow power ind. Light blinks three times...
Fixed with a firmware update (hard to believe, but true). Search Google for a file named: 2007SEN069.zip (don't worry if the page you find it on doesn't mention the 37HL17 - it worked fine). Unzip the file, and copy the 3 folders and 3 files to the root of a small SD card. The SD card MUST be 2GB or less in size (I used a 1GB card), and it MUST be formatted with FAT-16 (not FAT-32). Mine was pre-formatted as FAT (FAT-16). The SD port is on the back of the TV behind a cover plate near the power cable. You do NOT need to remove the back cover of the TV, just the small cover plate (1 screw). UNPLUG the TV; remove the cover plate; insert the SD card (prepped as explained above); Plug in the TV; Watch the yellow lights blink, then turn blue, then go dark; UNPLUG the TV; remove the SD Card and replace the cover; Plug in the TV; Yellow lights will blink a few times (this is normal); when blinking stops, turn on the TV and you should be good to go. :-)
Pictures attached are from a Toshiba software upgrade bulletin I found online.

tried to check first the power supply if no any sign of bulging electrolytic capacitor this was a common that we encountered trouble.

The tv have a problems with the board that called the tv main Tuner signal board.That the board where the tv incomming broadcasting signal cable plug into it.This tv it still useable.I have one too a 46".Try tv unplug,replug it back like about an hour this problems will solved for a while evenually will return though.Every times POWER and OPC LED lights flashes,just push the tv power button ON again on the remote and have to wait,sometimes tv it will lite up and work right away.Sometimes it will have POWER and OPC LED lights flashes again.Just have to push the remote power button ON again and wait a while again eventually tv it will lite up and work.Have to this like 3 or 4 times power ON button pushes somtimes,tv will eventually work though.I know i do this manytimes before my tv have this problems off/on 3 1/2 years.But finally u will have to replace the tv main Tuner signal board sooner or later though this solution dosen't work for the rest of the tv life.U can do some basic mechnical works like take things aparts and putting back together again.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Turner signal board for the replacement.

Hi,

Try unplugging the TV from the power point and leave unplugged for 5 min.
Or the batteries in the remote may be flat, try replacing the batteries.
If this doesn't work the TV may have a fault.

I hope this helps

MobileJB

seems like a power supply problem inside the tv and when the transformer gets warm it is giving you problems you might have to get a tech seviceman to come out and have a look at it as it is not a job you should do yourself when it comes to replacing the power supply hope all goes well

try unplugging your t.v for a few minutes, then plug it back in. if it continues check your owners manual or google your issue. this might be the red flash of death. hopefully unplugging it works. good luck!