LG 32LD350 Troubleshooting Manual page 36

Power Supply Board Test Power Supply Board Test
Note: When AC is applied, the SMPS "MUST" be producing
STBY 3.5V on pins 9, 10, 11 or 12 of P201.
If 3.5V Standby is not being generated, make sure AC is arriving at
the connector SK101. If it is, the SMPS is defective
and must be replaced. There is no need to continue with the
next test. next test.
AC Should not be applied at any time while adding jumper or
While unplugging connectors as damage to the circuit Board
may occur.
(b) Unplug P402 on the Main Board to make insertion of the Jumpers easier.
Use P402 Side to insert resistors
TEST PROCEDURE:
(A) Add a jumper between (3.5V STBY) pin 7, 8, 9 or 10 and Pin 1 (PWR_ON). Apply AC.
This will turn on the power supply, relays will click.
a) Check that the 24V and 12V power supplies are turned on,
• P201 (12V pins 17, 19 and 21) P201 (24V pins 2, 3 and 4) P203 (24V pins 1~5) • P201 (12V pins 17 19 and 21) P201 (24V pins 2 3 and 4) P203 (24V pins 1~5)
The Backlights should turn on at this point. If the 24V and the Inverter On command is arriving at the
Ballast, but no backlights, then see Ballast Section for further testing.
(B) Remove AC power and Remove Jumper. SMPS and Ballast are OK.
Backlights will turn on during this test Backlights will turn on during this test
November LCD TV 32LD350
36
Pin 1 is the
Brown Wire