Additionally, what is connected to the TV for devices (DVD, cable box, etc.), and do you have the same issue regardless of which INPUT you select?
If you bring up the MENU on the TV, is the MENU clear and visible over the Black or Blue screen?
Please disconnect the set from AC power, then press and hold the power button on the TV itself (not the remote), for 10 seconds. After another minute, plug the setback in and press power once. Do you still have the same problem?
There are basically three problems that would cause this, the Power Supply,the T-Con board, or the LCD panel itself has failed. Voltages need to bemeasured at the power supply outputs, using a DMM with nothing connected to itbut AC Input. If the readings are proper, then the other boards need to beconnected one at a time, until one causes the voltage to shut down at theoutput. Price to replace the power supply is around $200 parts and labor. Ifthe supply outputs power with all of the boards connected, then the T-Con needsto be tested. The T-Con will run you around $150 to have replaced. If the T-Contests good, then the LCD Panel has failed and will cost you more than a new TV(around $700) to have replaced and it is not cost effective to repair this set.I wish i had better news on this set, but the symptoms you're having indicate afailure in one of the components responsible for powering, and processing theLCD panel itself (including the LCD panel).
If you do not have experience testing live voltages on a circuit boardlevel, then I would suggest using the link below to locate a tech in your area:
An LED set, is an LCD panel that is backlit by LED lighting instead of CFFL (flourescent) lights. The issues, and problems that the sets have are the same.