LG KG110 - KEYPAD Backlight LEDS Trouble

Figure 4-19
Checking Flow
LED
Resistor
Capacitor
Start
Enter into engine mode and
turn backlight on
Are all keypad
backlight LEDs
working?
Replace not working
LEDs
Backlight work
properly?
Replace U101 or
change PCB board
OK
Check Vbat and
R/C components
works properly?
Replace R/C and
re-download
software
No
No
Yes
YesNo
No
Yes
4. TROUBLE SHOOTING
68
Checking Flow
Figure 4-19
4.13 KEYPAD Backlight LEDS Trouble