LG 42LV5500 Training Presentation page 46

Power Supply Board Backlights Test 2
st
Continue if the 1
Leave original jumper in place. Leave original jumper in place.
(3) Add another jumper between (STBY_3.5V)
pin 9, 10, 11 or 12 and Pin 18 (DRV_ON).
(4) Apply AC Power. Simulating a Power and
Backlight On command.
Backlights Normal:
a) If normal, the backlights should turn on. ) If l th b
SMPS OK, Inverter OK.
Backlights Abnormal:
a) Recheck all connections a) Recheck all connections.
b) Confirm the DRV_ON line pulling up to at least 3V.
c) Check the connections to the Panel.
If the DRV On command is pulling up to 3V and the 45V is being generated _
from C256 + leg, see the Inverter Section of the Power Supply for additional checks.
Note: If either P202 or P203 is disconnected, the backlights will come on,
The Error line will go high, then the backlights shut off in 4~6 seconds.
REMOVE AC POWER:
test was OK.
kli ht h ld t
p g p g g
May 201 1 LCD TV 42LV5500
46
Pin 1 is the
Brown Wire Brown Wire