No Response In Remote Controller, Key Error - LG 55LW5700 Service Manual

Standard Repair Process Detail Technical Manual
LCD TV
<ALL MODELS>
①
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
Analog Tester needle moves slowly, and defective when it does not move at all.
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Only for training and service purposes
Error
D. Function error_ No response in remote controller,
symptom
key error
Content
Remote controller operation checking method
②
Established
date
Revised
date
A27
2010. 12 .14
A27
P8200
1 SCL
2 SDA
3 GND
4 KEY1
5 KEY2
③
6 St 3.5V
7 GND
8 LED_B/logo_PWM
④
9 IR
10 GND
11 3.3V_Normal
12 LED_R/BUZZ
13 GND
14 ST_SCL
15 ST_SDA
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