Sony KD-55A8F Service Manual page 63

5.1 IR Remote Commander Error
IR remote commander
does not respond
Check harness
OK
connection between
B-board and Smart
Core
NG
OK
Change harness
between B-board to
Smart Core harness
NG
OK
Change Smart Core
NG
Change B-board
Main device issue
Harness connection
issue
B-board to Smart Core harness
issue
Smart Core issue
63
SYS SET