50PZ570G-ZB, 50PZ570S-ZB, 50PZ575S-ZB (CHASSIS:PD12C) - LG TV Service Manual (repair manual). Page 80

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Making 
PDP TV
Repair Process-Reference data
1.Check connector was inserted properly 
on Main board  and local switch board. 
[ If mechanical switch off status, Key-on is high(3.3v) ]
2. Check whether appear voltage on multi meter
when operate Local switch.
※ Test Condition for case 3
→ Check Point: Pin 3,4( Key1,Key2)
→ TV: power on status
→ Multi meter: Select DC 10V
A27
CH+
CH-
Vol+
Vol-
OK
HOME
Input
D. General function defect
Check Local Key operation
Symptom
A27
2010. 12 . 24
Control Board
Power Board
Y-Sus Board
Z-Sus Board
Main Board
IR Board
-
LED_Power_On
TOUCH_Ver_CHECK
BLUE_LED_ON
IR
GND
KEY1
KEY2
LED-RED
GND
SCL
SDA
+3.3V_ST
+3.3V_Normal/ 
+5V_MULTI
3.3V Multi
-
IR/KEY Board for XXPZ7/90XX 
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