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ASUS
L3 Service Manual
LCD backlight control signal U0401 boost, the output through the LCD connector J1705 input LCD.
Therefore, if the LCD backlight, the failure is generally analyzed as follows:
1. Check the LCD screen solder joints are good, especially the backlight control signal "LEDA", "LEDK" two
pins
2. Check LCD backlight "LEDA" (18 v) voltage is normal, the line device on the feedback signal "LEDK"
normal.
3.LCD backlight "LEDA" abnormal voltage, first check U0401 welding problems and peripherals, check the
enable signal "LCM_BL_PWM" is normal.
4. Start signal "LCM_BL_PWM" is not normal, check whether the output of the CPU is welded or replaced.
2017-06-08
ZD553KL
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