Panasonic TH-55DS630 - Does not start. Red led one blink repeat.

When connected, background light blinks three times and stops.
TV will not start.
Red LED blinks 1 blink and repeats.
Boards inside:
TNPA6072 P
TNPA6073 LDP
TNP4G587 A

First beginner post. Thank you for any help.

Try to test the led bars