Thank you for the reply. Unfortunately there is an internal fault.
I will try to explain the possibilities the best I can here.
One common cause of this is the power supply board. There are several capacitors that are prone to going out of spec, and can prevent the TV from producing sound and picture.
The other common issue is a faulty Mainboard. This board carries the communication to the power supply to allow the supply to deliver it's voltages to the various circuits in the TV.
Also, the backlight inverter boards which are responsible for lighting up the LCD display could be causing this problem. If one of the boards has a short, it can cause the power supply to shut down.
To determine which board in the TV is causing the failure, a Tech would need to measure
the outputs of the power supply using a meter to see if any are shorted, or if another fault board is causing it to shut down.
The average cost for this type of repair is between $150-$250 parts and labor.
I know this is not good news, and I wish there was a quick fix for this problem for you.
If you'd like, you can use the link below to locate a Tech in your area:
If you have more concerns then please press "Reply to Expert". Otherwise, please take a moment to RATE my service as Positive. Subscription is not required and your question does not close when you rate. You are rating my advice and information NOT how this site works or how your device functions (note that a negative rating does not issue a refund).