LG 55LW5600 Troubleshooting Manual page 55

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 at least 3V and the 63V 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
July 201 1 LCD TV
55
P201
SMPS TEST 2
Front pins on p
23 24
Connector are
Odd number
21 22
12V
19 20
12V
17 18 17 18
12V 12V
15 16
13 14
11 12
STBY 3.5V STBY 3 5V
9 10
STBY 3.5V
7 8
5 6
3 4
24V
1 2
PWR_ON
g g Pin 1 is the
Brown Wire
55LW56000
DRV_ON
B
STBY 3.5V STBY 3 5V
STBY 3.5V
24V
24V