LG MG210 Service Manual page 63

4. TROUBLE SHOOTING
START
The Voltage
Of LEDB signal
is about 0V?
Yes
Is there anything that
resistor value across LED
is under 10 ?
No
The path is OK?
Yes
The LED is out of order.
Change the LED.
Enter into Engineering Mode
and select Keypad On
No
Check the soldering
of R333 and R334
Power off and Measure the
Resistor Value of all LEDs.
Yes
Replace the ALL LED.
It is out of order.
No
Resolder the path
of LED and Resistor.
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Yes
ABB is out of order.
Change the Board.
No
ABB is out of order.
Change the Board.