LG 42LV5500 Training Presentation page 69

P901 Main Board to (Ft. IR/Intelligent Sensor) Voltage and Diode Check
P901 Connector "MAIN Board" To "IR Board"
Pin Label
(1)
1 SCL
(1)
2 SDA
3 Gnd
4 KEY 1
5 KEY 2
6 3.5V_ST
7 7 Gnd Gnd
8 LED_B/BUZZ
(2)
9 IR
10 Gnd
11 +3.3V_Normal
12 LED_R/BUZZ
13 Gnd
(3) (3)
14 14 S/T SCL S/T_SCL
(3)
15 S/T_SDA
(1) Clock & Data pulses only present when Intelligent Sensor is turned on. (3.6V p/p)
(2) IR pulses (2V p/p)
(3) Clock & Data pulses only present when Set is turned on or Off. (3.9V p/p)
Diode Mode values taken with all Connectors Removed
STBY Run
2.9V 3.49V
2.92V 3.49V
Gnd Gnd
3.26V 3.28V
3.26V 3.28V
3.55V 3.49V
Gnd Gnd Gnd Gnd
0V 0V
1.48V 1.45V
Gnd Gnd
0.35V 3.34V
0V 0V
Gnd Gnd
3.55V 3 55V 3 49V 3.49V
3.55V 3.49V
Diode Check
3.28V
3.28V
Gnd
1.88V
1.88V
1.15V
Gnd Gnd
OL
OL
Gnd
0.53V
2.67V
Gnd
1 86V 1.86V
1.86V
69
P901 P901
May 201 1 LCD TV 42LV5500
1