55LM9600 (CHASSIS:LA23E) - LG TV Service Manual (repair manual). Page 110

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Checking order
1, 2.  Check Motion cable condition between Motion assy & Main board.
3.      Check the 3.3V on the terminal 1.
Standard Repair Process Detail Technical Manual
Motion  Remote operation checking method
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A28
P4800
1
3.3V
2
GND
3
RX
4
TX
5
RESET
6
DC
7
DD
8
GND
2011. 12 .14
<XXLM9600>
A28
D. Function error
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