Read LG 50PQ100R-ZA (CHASSIS:PP91A) Service Manual online
Making
Revision
2009. 2 . 1
PDP TV
Symptom
Repair Process-Reference data
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
→ TV: power on status
→ Multi meter: Select DC 10V
4. Check bad solder & assembly status on Tactical power switch
▣ Checking method
Check Local switch operating
SCL-Sub/AMP
GND
KEY-ON
KEY2
KEY1
GND
SDA-Sub/AMP
GND
+5V ST
(+5V-Multi)
( +3.3V-CI )
LED-Red
LED-Green
GND
IR
Local switch Board
A27
Local switch Board for XXPQ60xx
Local switch Board for XXPQ20/30xx
Enter
Menu
Input
Mechanical
Power
Vol-
Vol+
CH-
CH+
D. General function defect
~PQ60xx
~PQ20/30xx
A27
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