Panasonic th-42pz77u has no picture.power light (red) flashes 7 times

This problems is common for this tv.The power supply board is the causes and the problems alway for this tv model and make.Try website like Ebay.com to buy a whole refurbish power supply board for the replacement

USALLY FLASH 7 IS SC BOARD ON SC BOARD THERE ARE MANY MOSSFETTE TRANSISTERS THAT ARE SHORT CHECK TO SEE IF YOU HAVE SHORT TRANSISTER IS YES REPLACE SC BOARD 150 DOLLARS DONT FORGET TO MAKE FIRMWARE UPDATE OR PROBLEME WILL COME BACK !!!!!!!FIST PICTURE TRANS SECOND C BOARD

9.2. Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the
defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
26
TH-42PZ77U:
There are different patterns for blinking light...
10 times indicate DG board problem - SUB 5V SOS, MAIN 3.3V SOS, DTV 9V SOS and Tuner Power SOS.

yes your sc board is short you must also do a firmware update

Please check light pattern:

Ur video backlight board it dead,must replaced to get the picture back.

replace sc board and do firmware update or problem will come back!

7 Blinks is the failure of the SC/SU/SD PCB's (1 2 or 3 depending on how lucky/unlucky) you are.

Panasonic have a great warranty usually. Give them a ring, it has failed.

The flashing LED is the fault code.

solution of light blinking

in protective mode the tv does not turn on and light is blinking, typically we must proceed by elimination as some faulty sections are preventing the tv to switch on. unplug the output power connectors from the power supply until the latter stop clicking. if it is still clicking after every of the output rail have been disconnected, then the power supply itself is faulty.

hope this helps!