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4. TROUBLE SHOOTING
z Slide Key backlight LED Operation scheme is shown below.
Is the Voltage level VBAT
Check the LED_ABC(U102)
Is LED_ABC a High?
Are all LEDs LED100~105
(Slide key) Working?
Backlight will work properly
LGE Internal Use Only
START
NO
3.35 ~4.2 V?
YES
NO
YES
NO
YES
- 112 -
Charge Battery
Check the condition
If problem, Replace U102(ABB)
Check the soldering of each
Resistor or Replace LESs not
working
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Only for training and service purposes
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Table of Contents
Troubleshooting
