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MX8550
START
Is the voltage level of +VPWR
3.3 ~ 4.2V?
Are all LEDs working ?
Is Q600 working ?
Main key backlight w ill work properly
LG Electronics Inc.
Checking Flow
Checking Flow
YES
NO
YES
NO
YES
NO
YES
Charge battery
Check the soldering of each R andLEDS,
or replace if not wor king
Replace Q 600
- 115/148
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