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LG -RD2750 Service Manual page 67

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Checking Flow : Back Light
START
No
Check the LED400:403
Re-soldering or Replace
R400:403
LED400:403, R400:403
Yes
No
Re-Soldering or
Does Q405 work Properly?
Replace Q405
Yes
No
Check the signal level at
Replace MSM
LCD_BACK_EN=high?
Yes
LCD backlight will
work properly

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