LG LG9200 Service Manual page 17

3. Technical Brief
3.1.10 KEY Back-light Illumination
• KEYPAD Back-light Scheme(slide part).
- There are 10 Deep Blue LEDs in slide Board for 'Number-key'.
- Keypad Back-light is driven by 'LEDB' and 'SOFTKEY_LED' line from IOTA .
SOFTKEY_LED
VBAT VBAT
LEDB
KEY Backlight (main PCB part)
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