LG 28LM4 0B-PU Series, Service Manual, Page: 61 / 69

Standard Repair Process Detail Technical Manual
Remote control operation checking method
D. Function error
A21
Established
date
Revised
date
Error
symptom
Content
Remote control operation checking method
date
①
IR Sensor & Keypad & LED
Pin Pin name
1
K0
2
5V
3
IR
③
yp
3
IR
4
GND
5
R
6 G
Front
Rear
PIN1
②
Checking order to check remote control
Checking order
1.Check IR cable condition between IR & Main board.( Check picture number
①
and
②
)
2.Check the standby 5V on the terminal 2 pin (
③
)
Checking order to check remote control
y p ( )
3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, the LED light will
be flashing 3 times, otherwise, it’s defective.
A21
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