LG 28LM4 0B-PU Series Service Manual page 61

Standard Repair Process Detail Technical Manual
Error
symptom
Content
①
IR Sensor & Keypad & LED yp
Front
Checking order to check remote control Checking order to check remote control
Checking order
1.Check IR cable condition between IR & Main board.( Check picture number① and ②)
2.Check the standby 5V on the terminal 2 pin (③) y
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.
D. Function error
Remote control operation checking method Remote control operation checking method
Rear
②
p ( )
A21
- 61 -
Established
date
Revised
date date
Pin
1
2
3 3
4
③
5
6
PIN1
A21
Pin name
K0
5V
IR IR
GND
R
G