42PT250-ZG (CHASSIS:PD13K) - LG TV Service Manual (repair manual). Page 71

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Making 
PDP TV
Repair Process-Reference data
1.Check connector was inserted properly 
on Main board and IR board. 
2. Check whether appear voltage on multi meter
when operate Local switch.
※ Test Condition for case 3
→ Check Point: Pin 2,3( Key1,Key2)
→ TV: power on status
→ Multi meter: Select DC 10V
A27
P+
P-
Vol+
Vol-
OK
Menu
Input
Power
D. General function defect
Check Local Key operation
Symptom
A27
TOUCH_VER_CHK
NC
NC
IR
GND
KEY1
KEY2
LED-RED
GND
SCL
SDA
GND
3.3V ST
NC
NC
IR & Local key Board for 2/3/4/550 TOOL 
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