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Repair Process-Reference data
PDP TV
~PQ60xx
~PQ20/30xx
CH+
CH-
Vol+
Vol-
Local switch Board for XXPQ20/30xx
Local switch Board for XXPQ60xx
Copyright ⓒ 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
D. General function defect
Symptom
Check Local switch operating
Local switch Board
Mechanical
Enter
Menu Input
Power
Making
Revision
IR
GND
KEY1
KEY2
KEY-ON
GND
SCL-Sub/AMP
SDA-Sub/AMP
GND
+5V ST
(+5V-Multi)
( +3.3V-CI )
GND
LED-Red
LED-Green
▣ Checking method
1.Check connector was inserted properly
on Main board and local switch board.
2. Check Key-on signal is low(GND Value, Mechanical switch on)
[ If mechanical switch off status, Key-on is high(5v) ]
3. 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
4. Check bad solder & assembly status on Tactical power switch
A27
2009. 2 . 1
A27
LGE Internal Use Only
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