Sony KD-55X8 G Series Service Manual page 46

SL/SLL
2.0 LED Blinking: 2x (Main power Error)
BSL
2-time blinking
Check "12.7V_MAIN"
Yes
at pin 11,13 of CN400
G Board/
on BSL Board,
LD board
Voltage > 13.2V ?
No
BSL Board
(Supplementary
46
information)