LG KM710 Service Manual - Page 96
Slide LCD Backlight LED Trouble Shooting
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4. Trouble Shooting 4.20 Slide LCD Backlight LED Trouble Shooting z Slide LCD backlight LED Operation scheme is shown below. VBAT 1u C707 6 C1P 2 C1N C708 1u LCD_BL_ENM LCD_BL_ENS VA708 VA709 3 IN OUT 7 1 GND 9 ENM LED1 14 MAXU8760300XETLLLDEEE2DDD0234+T11113210 LED5 8 ENS 15 P_GND 5 C2P 4 C2N EVLC5S0E2V1L0C05S02100 1u C709 LED_OUT LED_CA1 LED_CA2 LED_CA3 SLED_CA1 SLED_CA2 C710 2.2u z Slide LCD Backlight operation - Slide backlight LED is controlled with LED_CA1~3 and SLED_CA1~2 signals - Main Flexible FPCB - LCD_BL_ENM and LCD_BL_ENS signals from DBB(U102) - The LEDs are forward biased and turned on z Check Point - VBAT level ( 3.35 ~4.2V) - Main FPCB - LEDs - Charge pump Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 97 - LGE Internal Use Only
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