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5-11 Back Light (for Sub LCD & Key)
R484 = "H" ?
Check the CN100 pin 2 = "H" ?
LCD backlight on ?
END
5-17
Backlight does not work
Backlight "ON" mode
in the menu?
Yes
GPIO7 by test S/W
LCD BACKLIGHT
Yes
No
Yes
No
Yes
No
Yes
Resolder R313, R314
Resolder Q302
Resolder R301~R309
and D303~D311
No
Select backlight "ON" mode
KEY PCB LED
GPIO2 by test S/W
Check the
CN201 pin 2
Replace EL sheet
No
No
No
Flow Chart of Troubleshooting and Circuit Diagrams
Q302 pin 1 = "H" ?
Q302 pin 1 = "H" ?
Yes
Q302 pin 3 = "L" ?
Yes
Key LED on ?
Yes
END
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