Sony XR-55A75L Service Manual page 128

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TROUBLESHOOTING
5.2 Light Sensor Error
Backlight level does not change when
ambient light changed
Check Light sensor
Setting is "ON"
setting in TV menu.
On RC press
"Setting"Select "Light
Sensor"
Setting is "OFF"
Setting issue,
Change setting to "ON"
Check harness
NG
connection between
B-board and H-board
OK
OK
Change harness
between B-board to
H-board
NG
OK
Change H-board
NG
Change B-board
Main device issue
Harness connection
issue
B-board to H-board
harness issue
H-board issue
128
SYS SET

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