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MX8550
1
Do some of the LEDs turn on?
Check the R134 whether it is 56ohm
Replace key PCB
Wheel light will work properly
LG Electronics Inc.
Checking Flow #1
Checking Flow #1
YES
NO
YES
NO
YES
2
: All LEDS do not turns on.
Check the anodes of dual
LEDs are short-circuited.
Are there short-circuited?
Resolder Dual LEDs
Replace the expanders(U102,
103, 104, 105 in key PCB)
which are related with miss-
lighted LEDS
- 120/148
-
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