LG 47LX9500 - Page 56

September LCD TV 47LX9500
56
Continue if the 1
st
test was OK.
Leave original jumper in place.
(3) Add another jumper between (STBY_3.5V)
pin 9, 10, 11 or 12 and Pin 18 (INV_On).
(4) Apply AC Power. Simulating a Power and
Backlight On command.
Backlights Normal:
a) If normal, the backlights should turn on.
SMPS OK, Inverter OK.
Backlights Abnormal:
a) Recheck all connections.
b) Confirm the INV On/Off line pulling up to at least 3V and arriving at both Inverters.
c) Check the connections to the Inverters.
If the 24V and the Inverter On command is arriving at the Inverters in, then see Inverter Section
for further testing.
Note: Either Inverter can run separately.
REMOVE AC POWER:
Power Supply Board Backlights Test 2
Power Supply Board Backlights Test 2
Pin 1 is the
Brown Wire