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TEST 2 (OLED EF Series) Power Supply Board T-CON 12V Power Check
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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 P202 pins 7-12 for an excessive load, normal diode check
should be 0.48V P202 connected 0.50V P203 disconnected.
should be 0.48V P202 connected "0.50V" P203 disconnected.
Check CN11 pins 8-12 on the T-CON for an excessive load.
Diode check should be "1.04V". (CN11 unplugged from the SMPS, the
panel can be connected or disconnected).
Note: With Red lead on Chassis ground, reading is 0.41V.
See Next page to Test the Power Supply's T-CON 12V and 24V line.
4
P201
SMPS TEST 2
Top Row pins
23 24
are Odd numbers
21 22
24V
19 20
24V
17 18
15 16
15 16
12V
13 14
12V
11 12
12V
9
9
10
10
7
8
STBY 3.5V
STBY 3.5V
5
6
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
jumpers in the incorrect locations,
please use a 100 ohm 1/8W resistor
instead.
Fig 2
24V
24V
12V_ON
12V
12V
B
B
STBY 3.5V
Gnd
DRV_ON
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