55EA9800-SA (CHASSIS:EJ34D) - LG TV Service Manual (repair manual). Page 95

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Standard Repair Process Detail Technical Manual
D. Function error
A22
Established 
date 
Revised 
Error 
symptom
Content
LCD  TV
2013.01.31
P4002
1
KEY2
Remote controller operation checking method
A22
date 
Content
1
KEY2
2
+3.5V_ST
3
GND
4
LOGO Light Wafer
5
IR
5
IR
6
GND
7
EYE SCL
8
EYE SDA
Checking order
g
1, 2.  Check Touch cable condition between Touch & Main board.
3.      Check the st-by 3.5V on the terminal 4,7.
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
Analog Tester needle moves slowly, and defective when it does not move at all. 
A22
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