LG LG9200 Service Manual page 57

4. TROUBLE SHOOTING
Keypad Backlight Trouble (Number Key) : (2)
• Trouble Shooting Setup
- Connect PIF-UNION to the phone, and power on.
- Enter engineering mode.
- Go to menu "Baseband -> Backlight -> Keypad on"
• Trouble Shooting Procedure
- Check the soldering of components.
- Check the LEDB signal.
- Check the SOFTKEY_LED signal.
- Check LEDs.
Key backlight LED
Check soldering
or contacting this point !
- 58 -