LG 42LV5500 - TROUBLESHOOTING; General Troubleshooting

P502 Main Board Connector to Power Supply Voltage and Diode Check
P502
P502 "MAIN Board" Connector To P201 "SMPS Board"
Pin Label STBY Run Diode Check
1PWR-ON 0V 2.62V 2.89V
2-4 24V 0V 24.5V OL
5-8 Gnd Gnd Gnd Gnd
9
12
35V ST
3 55V
3 53V
1 15V
9
-
12
3
.
5V
_
ST
3
.
55V
3
.
53V
1
.
15V
13-15 Gnd Gnd Gnd Gnd
16 GND/VSYNC n/c n/c OL
17 12V 0V 12V 2.07V
18 INV-ON 0V 3.26V 1.53V
19 12V 0V 12V 2.07V
20 A-DIM n/c n/c OL
21 12
V
0
V 12V 2.
0
7V
Odd Pins Top Row
0
0
22 PDIM-1 0V 0.2V~3.3V 2.35V
23 n/c n/c n/c OL
24 Err OUT n/c n/c OL
(1)
PDIM Pin 22 can vary according to incoming video IRE level,
OSD Backlight setting and Intelligent Sensor (room light condition).
Range 0.2V to 3.3V.
P
DIM1
May 2011 LCD TV 42LV5500
66
Diode Mode values taken with all Connectors Removed
P
-
DIM1
3.66V p/p 50IRE