Sony KD-49X7 D Series Service Manual page 143

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"
Resistor value
[BFM/BM2]
R1029 : 0 [ohm]
R1109 : 0 [ohm]
R1052 : 150k [ohm]
* R1029, R1109 may be not mounted
Check harness
OK
connection between
B-board and
SmartCore
NG
OK
Check harness
connection between
B-board and H-board
NG
OK
Change harness
between B-board to
SmartCore harness
NG
OK
Change SmartCore
NG
NG
Check resistor value on
B-board
OK
143
Battery of remote
commander
could be weak.
Change battery.
Harness connection
issue
B-board to SmartCore harness
issue
SmartCore issue
Parts issue
Change B-board
Main device issue
143