Sony KD-55A8F Service Manual page 64

5.2 Light Sensor Error
Backlight level does not
change when ambient
light changed
Setting is "ON"
Check UI setting and
make sure light sensor
setting is "ON"
Setting is "OFF"
Setting issue
Change setting to "ON"
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
64
SYS SET