How long have you had the set for?
Did this problem occur after a storm or power outage in your area?
Are you unable to get the MENU on screen, using the TV remote and pressing MENU?
Thanks for the reply.
Unfortunately I do not havegood news for you. There is no sequence of buttons you can press the reset theTV, and it will require circuit testing and component replacement to operateproperly again.
There are basically threeproblems that would cause this, the Power Supply, the T-Con boards, or the LCDpanel itself has failed. Voltages need to be measured at the power supplyoutputs, using a DMM with nothing connected to it but AC Input. If the readingsare proper, then the other boards need to be connected one at a time, until onecauses the voltage to shut down at the output. If the supply outputs power withall of the boards connected, then the T-Con needs to be tested. The T-Con willrun you around $300 to have replaced. If the T-Con tests good, then the LCDPanel has failed and will cost you more than a new TV (around $700) to havereplaced and it is not cost effective to repair this set.
If you do not haveexperience testing live voltages on a circuit board level, then I would suggestusing the link below to locate a tech in your area:
If you need furtherassistance, let me know.
If this answers yourquestion, please click "Accept", as it is the only way we Experts getpaid for our knowledge on the site. Tips and Bonuses are welcome andappreciated!!