Remote Controller Operation Checking Method - LG 55LA7400 Service Manual

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<ALL MODELS>
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 4.
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,
key error

Remote controller operation checking method

②
①
Established
- 73/83 -
2012. 11 .30
date
Revised
date
1
2
3
4
5
③
6
7
8
④
9
10
A27
P4102
GND
Key1
Key2
+3.5V_ST
GND
LOGO / LED_R
IR
GND
EYE_SCL
EYE_SDA
LGE Internal Use Only