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9.3 Backlight trouble
Replace L6
Reconnect FPC
Refer to can not power on
Check BL EN
Check LCD BL PWM?
N
What about turn on
moments?
Y
Is R91 value OK?
Y
Replace U20
（
Continued next page
Backlight trouble
N
Is FPC connect well
Y
N
Mainboard power on
Y
N
Is U20 pin4 is 3.3V
Y
N
Is LCD BL PWM low?
Y
N
Is U20 Pin3 0.2V
Y
Is D19 OK
Y
OK
）
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