LG 55EG9600 Training page 29

TEST 2 Power Supply Board 12VT to T-CON Voltage Check
Continue if Test 1 was OK.
Leave original jumper (A) in place.
AC Power is removed at this time.
The T-CON should be connected, SMPS P202 and P203 to T-CON.
TEST 2: T-CON 12V POWER SECTION TEST:
(3) Add another jumper (B) between (STBY_3.5V) pin 8 and (12V_ON) Pin 18.
(See Fig. 2), Simulating PWR_ON and 12V_ON commands.
(4) Apply AC Power.
(5) Check 12V (11.87V) on pins 7-12 on P202.
T-CON 12V Normal:
a) If normal, the SMPS is OK, T-CON 12V load test OK.
T-CON 12V Abnormal:
a) Recheck all connections.
b) Confirm the 12V_ON line pulling up to at least 3V.
c) Check SMPS P203 pins 7-12 for an excessive load,
normal diode check should be;
• 0.47V P203 connected
• "0.50V" P203 disconnected.
Also, check CN11 pins 8-12 on the T-CON for an excessive load.
• 1.89V (Blk on Gnd) Panel Connected or Disconnected.
• 0.42V (Red on Gnd) Panel Connected or Disconnected.
See Next page to Test the Power Supply's T-CON 12VT and 24VD line.
November 2017
Page 05
55EG9600 (2015 OLED) Power Supply
P201
SMPS TEST 2
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
PWR_ON
Pin 1 is Bottom on SMPS
Pin 1 is Top on Main
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.
Fig 2
B
DRV_ON
LG