2015 (EF Series) OLED SMPS Testing
Updated 03
16
2016 ver2
Forcing on the Power Supply
Testing the Power Supply
55EF9500
65EF9500
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1
Read First Before Beginning the Power Supply Testing Procedure
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When servicing an OLED TV and you need to Test the Power Supply, due to the symptoms the TV Won’t Come On or
TV Intermittent Powers Off, before beginning the Power Supply Testing READ THE BELOW FIRST.
Check the Front Power Indicator:
Take note of the front Power LED. If it begins to “Blink” (about once a second) continually for 30 seconds and the TV
makes no attempt to turn on, it means that the Main board is “Latched” and no functions work.
If this happens, the Main board will not function again normally until it is unlatched even if the Main board is placed in
.
To Unlatch the Main Board:
Press the “Power Only” button using the Service Remote. This will place the TV into P-Only mode. P-Only = TV comes
on in Full White Raster. A P-Only black box with text appears in the upper left hand side of the screen. P-Only mode
will also bypass the “Burn Det” circuit, which will allow the TV to turn on normally.
If the TV Comes on Normally in P-Only Mode:
Press Exit on any remote and the screen is not full white raster. Press the “In-Start” button and enter the Service
Menu. Scroll down to “Power_Off_History” and look at the events that shut off the TV. If you find three consecutive
“INV_ERROR” this indicates activation of the Burn_Det circuit which is what “Latched” the Main board. If this is the
case, look for the Service Bulletin for this model; “Improved Auto Power
you to update the Software via USB only.
_
No Power issue”. This bulletin requires
If the TV Still Won’t Come On:
In this case follow the Power Supply Testing, check the Main board. If both are OK, replace the Panel.
If the OLED TV Shuts Off Intermittently:
With the OLED turned on, press the “In-Start” button and enter the Service Menu. Scroll down to “Power_Off_History”
and look at the events that shut the TV off. If you find “PWR_OFF_by_20V_DET or PWR_OFF_by_INV_ERROR”, look for
the Service Bulletin for this model; “Improved Auto Power Off / No Power issue”. This bulletin requires you to update the
Software via USB onl
If the TV Still Continues to Intermittently Shut Off:
In this case follow the Power Supply Testing, check the Main board. If both are OK, replace the Panel.
.
2
TEST 1 (OLED EF Series) Power Supply Board 12V/24V to Main Voltage Check
unplugging connectors,
damage to the circuit
Board may
occur.
Top Row pins
If 3.5V Standby is not being generated, the SMPS is defective
17
18
12V_ON
II
) Unplug
P2399
the Main Board to make insertion of the Jumpers easier
(1)
Add
jumper (
A
) between (3.5V STBY) pin
and
(
PWR_ON
) Pin 1
•
P201
(
23.70V
pins
22)
See Next page to Test the Power Supply s T
CON 12V line
AC Should not be applied at any time while adding jumpers or While
I) When AC is applied, the SMPS “MUST” be producing
STBY 3.5V (3.52V) on pins 5 and 7, 8 of P201.
and may need to be replaced. Make sure AC is arriving at the connector SK100
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.
on
.
Use P2399 side to insert jumpers.
TEST 1: TESTING THE POWER SUPPLY TURN-ON CIRCUIT. (See Fig 1)
a
5
,
(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)
19-
SMPS TEST 1
are Odd numbers
STBY 3.5V
STBY 3.5V
A
PWR_ON
24V
24V
12V
12V
12V
P201
23 24
21 22
19 20
15 16
13 14
11 12
9 10
7 8
5 6
3 4
1 2
Fig 1
24V
24V
12V
12V
STBY 3.5V
Gnd
DRV_ON
No 12V or 24V to T-CON at this time.
(2) Remove AC power
’
-
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.
Pin 1 is Bottom on SMPS
Pin 1 is Top on Main
.
3
TEST 2 (OLED EF Series) Power Supply Board T-CON 12V Power Check
15
16
9
10
B
should be 0.48V P202 connected 0.50V P203 disconnected.
jumpers in the incorrect locations
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 P202 pins 7-12 for an excessive load, normal diode check
“
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.
”
24V
24V
12V
12V
12V
P201
23 24
21 22
19 20
17 18
13 14
11 12
7 8
5 6
3 4
1 2
Fig 2
24V
24V
12V_ON
12V
12V
STBY 3.5V
Gnd
DRV_ON
SMPS TEST 2
Top Row pins
are Odd numbers
STBY 3.5V
STBY 3.5V
A
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
,
please use a 100 ohm 1/8W resistor
instead.
4
TEST 3 (OLED EF Series) Power Supply Board T-CON 12V and 24V Power Check
(3) (B)
are Odd numbers
()
() j p ( _ )p ( _ )
(5)
()
p
3
4
A
Check CN5 pins 8
14 on the T
CON for an excessive load.
jumpers in the incorrect locations
Continue if Test 1 and Test 2 were OK.
Leave jumpers (A) and (B) in place. AC Power is removed at this time.
The T-CON should be connected, SMPS P202 and P203 to T-CON.
TEST 3: T-CON 24V POWER SECTION TEST:
Add another jumper between (STBY_3.5V) pin 5 and (DRV_ON) Pin 2.
(See Fig. 3), Simulating PWR_ON, DRV_ON and 12V_ON command.
(4) Apply AC Power.
Check 24V on pins 8-14 on P203.
T-CON 24V Normal:
a) If normal (24.16V), the SMPS is OK, T-CON load test OK.
T-CON 24V Abnormal:
a) Recheck all connections.
b) Confirm the DRV_ON line pulling up to at least 3V.
c) Check SMPS P203 pins 8-14 for an excessive load, diode check should
be “0.48V” P203 connected or disconnected.
(CN5 unplugged from the SMPS, Panel connected). Diode check should be
“OL” (Blk lead on Gnd) 0.38V (Red lead on Gnd).
(CN5 unplugged from the SMPS, Panel disconnected). Diode check
should be “OL” (Blk lead on Gnd) 0.51V (Red lead on Gnd).
See Next page to Test the Power Supply’s T-CON 24V line
using a light bulb test jig.
-
24V
24V
12V
12V
12V
P201
23 24
21 22
19 20
17 18
15 16
13 14
11 12
9 10
7 8
5 6
1 2
Fig 1
24V
24V
12V_ON
12V
12V
B
STBY 3.5V
Gnd
DRV_ON
SMPS TEST 3
Top Row pins
STBY 3.5V
STBY 3.5V
PWR_ON
C
Pin 1 is Bottom on SMPS
Pin 1 is Top on Main
TIP: If you are concerned that you
may accidently connect the
,
please use a 100 ohm 1/8W resistor
instead.
5
TEST 4: (2015 EF Series OLED) Power Supply Board T-CON 12V and 24V Power
g
g()
In this case, the Power Supply needs to be tested to see if it can supply the T-CON 24V and 12V when loaded.
TEST 4: 24V T-CON POWER LOAD CHECK:
(1) Leave all Jumpers in place on P2399 to P201 of the Power Supply and disconnect CN5 on the T-CON board.
(2) Make a 24V load test jig by using a standard 1157 automobile light bulb, (dual element). Solder two wires from the
buttons on the bottom of the bulb. Do not solder any wire to the actual ground of the bulb. (See Fig 4).
(3) Attach one end of the Jig to the 24V line from P203 pins 8-15 from the SMPS.
Fig 4
(4) Attach the other wire from the Jig to Chassis Ground.
Tip: To make insertion easy, cut the sharp end of a safety pin off
and solder it to each end of the wires coming from the light bulb Jig.
Push one needle end into one of the pins 8-14 of CN5.
Push the other needle end of the wire into any pin 1-7 of CN5.
(5) Apply AC to the power supply, the light bulb should light and remain lit.
Measure the 24V line to confirm it’s correct. The bulb should be bright.
Let the SMPS run for several minutes to confirm its operating correctly.
(Do not let wires or light bulb touch any metal parts).
Note: You can also use two sin
le element automotive bulbs (each 6W) tied in series.
a: If the Light Bulb remains lit, the panel is defective because the T-CON and/or the panel is providing too much of a
load causing the power supply to shut off.
b: If the SMPS shuts off, Replace the Power Supply.
TEST 5: 12V T-CON POWER LOAD CHECK:
Note: You can test the 12V to the T-CON line using the same procedure, but you only need one bulb. Use same
bulb, but solder one lead to a button and the other to the case.
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