LG MG180C Service Manual page 62

START
The Volt age
Of LEDB signal
is ab out 0V?
Yes
Is ther e anyt hing th at
resistor valu e acr oss LED
is und er 10 ?
No
The pat h is O K?
Yes
The LED i s out of order.
Change th e LED.
Enter into Engineering Mode
and select Keypad On
No
Check th e solder ing
of R 320
Power off and Measure the
Resistor Value of all LEDs.
Yes
Replac e the A LL LED .
It is out of order.
No
Re_sold er the path
of LED and Resi stor .
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4. TROUBLE SHOOTING
Yes
ABB is out of order.
Change th e Board.
No
ABB is out of order.
Change th e Board.