LG 55EG9600 Training page 28

TEST 1 Power Supply Board 12VM/24VS to Main Voltage Check
AC Should not be applied at any time while adding jumpers or While
unplugging connectors, damage to the circuit Board may occur.
I) When AC is applied, the SMPS "MUST" be producing
STBY 3.5V (3.52V) on pins 5 and 7, 8 of P201.
If 3.5V Standby is not being generated, the SMPS is defective
and may need to be replaced. Make sure AC is arriving at the connector SK100,
make sure 112V (HGnd) is arriving at P102 pins 11~14 and +3.5V_ST is not loaded
down by the Main Board or the Joy Stick/IR Board. Remove connector on Main
board. If STBY is still missing, SMPS is defective.
II) Unplug P2399 on the Main Board to make insertion of the Jumpers easier.
Use P2399 side to insert jumpers.
TEST 1: TESTING THE POWER SUPPLY TURN-ON CIRCUIT. (See Fig 1)
(1) Add a jumper (A) between (3.5V STBY) pin 5 and (PWR_ON) Pin 1,
(See Fig 1). Apply AC, this will turn on the SMPS. Relay click will be heard.
Check that the 24V and 12V power supplies to the Main board are turned on,
To Main Board Power:
• P201 (11.96V pins 11-15)
• P201 (23.72V pins 19-22)
(2) Remove AC power
See Next page to Test the Power Supply's T-CON 12VT line.
November 2017
No 12VT or 24VD to T-CON at this time.
TIP: If you are concerned that you may accidently connect the jumpers in the incorrect
locations, please use a 100 ohm 1/8W resistor instead.
Page 04
55EG9600 (2015 OLED) Power Supply
P201
SMPS TEST 1 Fig 1
Top Row pins
23 24
are Odd numbers
21 22
24V
24V
19 20
24V
24V
17 18
12V_ON
15 16
12V
13 14
12V 12V
11 12
12V 12V
9 10
7 8
STBY 3.5V
STBY 3.5V
STBY 3.5V
5 6
Gnd
A
3 4
1 2
DRV_ON
PWR_ON
Pin 1 is Bottom on SMPS
Pin 1 is Top on Main
LG