Main Board To (Ft. Ir/Intelligent Sensor) Voltage And Diode Check - LG 55LW5600 Troubleshooting Manual

P901 Main Board to (Ft. IR/Intelligent Sensor) Voltage and Diode Check
P901 Connector "MAIN Board" To "IR Board" J1
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)
14 14 S/T SCL S/T_SCL
(3)
15 S/T_SCL
(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
3.55V 3.48V
3.55V 3.48V
Gnd Gnd
3.31V 3.31V
3.31V 3.31V
3.55V 3.48V
Gnd Gnd Gnd Gnd
0V 0V
1.5V 1.41V
Gnd Gnd
0V 3.33V
0V 0V
Gnd Gnd
3 55V 3.55V 3.48V 3 48V
3.55V 3.48V
Diode Check
3.29V
3.29V
Gnd
1.84V
1.84V
1.15V
Gnd Gnd
OL
OL
Gnd
0.55V
2.68V
Gnd
1.91V 1 91V
1.92V
78
P901 P901
July 201 1 LCD TV
1
55LW56000