5-15
Flow Chart of Troubleshooting and Circuit Diagrams
5-9 Backlight
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
R217 = "H" ?
GPIO5 by test S/W
No
Yes
Yes
No
Replace LCD
KEY PCB LED
Resolder R217,R218
or Resolder Q201
Q201 pin 3 = "L" ?
No
Yes
Yes
END
Key PCB LED on ?
Resolder
R206,R211,R212,R213,R214,
R215,R240,R241, R242, R243
or Replace PBA
No