LG 42LV5500 - Power Supply Board Low Voltage Test 1

AC Should not be applied at any time while adding jumpers or
While unplugging connectors as damage to the circuit Board
Power Supply Board Low Voltage Test 1
While
unplugging
connectors
as
damage
to
the
circuit
Board
may occur.
a) 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, the SMPS is defective
and must be replaced. There is no need to continue with the
next test.
But, make sure AC is arriving at the connector SK101.
(b) Unplug P502 on the Main Board to make insertion of the Jumpers easier.
Use P502 Side to insert resistors
TEST 1:
Pin 1 is the
Brown Wire
(1) 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, relay will click.
a) Check that the 24V (24.41V) and 12V power supplies are turned on,
• P201 (12V pins 17, 19 and 21)
•
P201 (
24V
pins 2 3 and 4)
•
P201
(
24V
pins
2
,
3
and
4)
• P202 (36V pins 1 and 12) AND P203 (pins 1 and 13)
(2) Remove AC power
No Backlights during this test
Pin 1 is the
Brown Wire
May 2011 LCD TV 42LV5500
45