Samsung QA55Q900RBWX Series User manual

QLED TV
SERVICEManual
QLED TV Contents
1. Precautions
2. Product specications
3. Disassembly and Reassembly
4. Troubleshooting
5. Wiring Diagram
Project : QRQ900Z
Chassis : QWD92
Model :
QA55Q900RBWX**
QA65Q900RBWX**
QA75Q900RBWX**
QA82Q900RBWX**
QA98Q900RBWX**

Contents
1. Precautions....................................................................................................................... 1-1
1-1. Safety Precautions .......................................................................................................................1-1
1-1-1. Warnings.............................................................................................................................1-1
1-1-2. Servicing the LED TV ........................................................................................................1-1
1-1-3. Fire and Shock Hazard......................................................................................................1-1
1-1-4. Product Safety Notices.................................................................................................... 1-2
1-2. Servicing Precautions................................................................................................................. 1-3
1-2-1. General Servicing Precautions ...................................................................................... 1-3
1-3. Static Electricity Precautions .................................................................................................... 1-4
1-4. Installation Precautions............................................................................................................. 1-5
2. Product Specications .................................................................................................... 2-1
2-1. Product information.....................................................................................................................2-1
2-2. Product specication..................................................................................................................2-2
2-3. Accessories................................................................................................................................2-23
2-4. Features......................................................................................................................................2-24
2-4-1. Quick Guides...................................................................................................................2-24
2-4-2. The Samsung Smart Remote ......................................................................................2-29
2-4-3. Using the TV Controller................................................................................................ 2-31
2-4-4. RearView & One Connect ............................................................................................2-32
2-6. Supported Formats...................................................................................................................2-33
3. Disassembly and Reassemble........................................................................................ 3-1
3-1. TV Disassembly............................................................................................................................ 3-1
3-2. One Connect Disassembly.........................................................................................................3-5
4. Troubleshooting .............................................................................................................. 4-1
4-1. Diagnostic Methods (Flashing Symptom Codes) ................................................................... 4-1
4-2. Function Control Operation Test ..............................................................................................4-3
4-3. Power ............................................................................................................................................4-4
4-3-1. TV POWER STANDBY TEST.............................................................................................4-5
4-3-2. TV POWER ON SEQUENCE TEST .................................................................................4-5
4-3-3. SMPS/PANEL BACKLIGHT TEST ...................................................................................4-5
4-4. Video .............................................................................................................................................4-6
4-4-1. ONE CONNECT.................................................................................................................4-6
4-4-2. MAIN/T-CON BOARD ..................................................................................................... 4-7
4-4-3. PANEL...............................................................................................................................4-9
4-4-4. Check Test Patterns......................................................................................................4-10

4-5. Audio............................................................................................................................................4-11
4-6. Network...................................................................................................................................... 4-12
4-7. Smart Hub...................................................................................................................................4-13
4-8. Bluetooth / WiFi Module..........................................................................................................4-15
4-9. Replacing Main Board.............................................................................................................. 4-17
4-10. Factory Mode ...........................................................................................................................4-19
4-11. Factory Mode Adjustments....................................................................................................4-25
4-11-1. Entering Factory Mode................................................................................................4-25
4-11-2. Detail Factory Option..................................................................................................4-26
4-11-3. Factory Data .................................................................................................................4-27
4-12. RS-232C ....................................................................................................................................4-36
4-13. AV Control Tabe .......................................................................................................................4-37
4-14. Updating the TV’s Software.................................................................................................. 4-44
4-14-1. Updating the TV’s software to the latest version.................................................. 4-44
4-14-2. Updating the TV automatically................................................................................ 4-44
5. Wiring Diagram................................................................................................................ 5-1
5-1. Wiring Diagram.............................................................................................................................5-1
5-2. Connector.....................................................................................................................................5-4
5-2-1. Main Board........................................................................................................................5-4
5-2-2. LD/SMPS Board.............................................................................................................5-10
5-2-3. One Connect Board....................................................................................................... 5-13

This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
© 2019 Samsung Electronics Co.,Ltd.
All rights reserved.
Printed in Korea

3-1
3. Disassembly and Reassemble
3. Disassembly and Reassemble
This section of the service manual describes the disassembly and reassembly procedures forthe LED TV.
CAUTION
1. Disconnect the LED TV from the power source before disassembly.
2. Follow these directions carefully.
- Use the Samsung Open Jig and Cushion to remove the Rear Cover.
• Open Jig Tool, Protection Cushion (curved models Only)
- Recommended Torque forCabinet/Stand screws : 10 ~12kgf
• A strength of Torque can be changed depending on the situation.
3-1. TV Disassembly
Description & Screws Picture Description
1
Place the TV on the Protection Cushion.
2
4EA screws on TV stand guide. And then remove
stand.
3
Insert the Open Jig tool completely into bottom of the
rear cover(1) and following directions 2→3→4

3-2
3. Disassembly and Reassemble
Description & Screws Picture Description
4
Gently lift up the Rear Cover from the bottom
corners to release all mounting clips as
indicated by Red Rectangles. If tabs break,
Using Back coveras it is.
Locking tabs locations
5
(82") Remove the BT/WIFI module from Source
Cover(1).
Remove the BT/WIFI and speaker cables from
the TV board(2) then remove the speakers(3).
(1)
(2)
(3)
5-1
(65/75")Remove the BT/WIFI module from
Source Cover(1).
Remove the BT/WIFI and speakercables from
the TV board(2)
then remove the speakers(3).
6
Remove USI-T cables(A) and Function cable(B)
on TV board.
A
B

3-3
3. Disassembly and Reassemble
Description & Screws Picture Description
7
Remove the power cable(A), (B) on Power board.
Remove the power cable(C) on TV Board
ABC
8
Remove the power cable(A) on Power board.
Remove the power cable(B) on TV Board
A
B
9
Remove the ffc(SPI)(A) on Power board. Remove
ffc(SPI) (B) on TV Board
A
B
10
Remove the power cable(A), (B) on Power board
AB

3-4
3. Disassembly and Reassemble
Description & Screws Picture Description
11
(85")Removing LD/ SMPS board
- Remove each FFC Cable(BLU) (1)
- Undo 8 screw points(2)
②
①
Removing Main board
- Undo 4 screw points
11-1
(65"/75"/82")Removing LD/ SMPS board
- Remove each FFC Cable(BLU)
- Slide the board to unlock(If you are in trouble,
you can use open jig to unlock)
NOTE
Reassembly procedures are in the reverse order of disassembly procedures.

3-5
3. Disassembly and Reassemble
3-2. One Connect Disassembly
Description & Screws Picture Description
1
Remove the 3 screws from ASSY COVER P-OC
BOTTOM.
Screws
6003-000282
SCREW-TAPTYPE : M3 x L8, ZPC(BLK)
• C/BOTTOM+C/TOP
2
Use the Open Tool to unlock each corner.
Open Jigs
• Use Open Jig Tool or a similar Tool.
BN81-14946B
3
Turn One Connect Box upright and Remove Top
Cover.
WARNING
Before Removing SMPS Board
• You have to discharge the SMPS by using
service JIG.
9If LED ON : LED OFF, discharge is
completed.
A/S-DISCHARGE-JIG
BN81-12884A

3-6
3. Disassembly and Reassemble
Description & Screws Picture Description
4
Remove the Cables.
CNM803(26Pin)
LEAD CONNECTOR-POWER
5
Remove the 5 screws at each marked screw
location on the board.
Screws
6003-000282
SCREW-TAPTYPE : M3 x L8, ZPC(BLK)
• SMPS+S/TOP
6
Lift off the black Insulator Sheet taped to the
plate assembly at "PULL" marked location. Be
careful not to tear it.
7
Remove the 2 screws on the plate Assembly
then remove the assembly.
Screws
6003-000282
SCREW-TAPTYPE : M3 x L8, ZPC(BLK)
• S/TOP+C/BOTTOM

3-7
3. Disassembly and Reassemble
Description & Screws Picture Description
8
Remove the 4 screws on the One Connect Board.
Screws
6003-000282
SCREW-TAPTYPE : M3 x L8, ZPC(BLK)
• MAIN BOARD+C/BOTTOM
9
Completed the disassembly.
NOTE
Reassembly procedures are in the reverse order of disassembly procedures.

4. Troubleshooting
4-1. Diagnostic Methods (Flashing Symptom Codes)
After TV is "COLD BOOTED" (AC PowerRe-Cycled), Flashing symptom codes will operate and show the defect block with


 Defect type and Number of LED ash
Defect Block Detection Method Numberof LED Flash
OC Box - LED Off No Blinking
Main Board • Watch Dog Count £Reboot £Flash
• Error £Flash 1 time
1 sec
, Blinks 1 time when cold Boot
4 sec
Panel • Error £Reboot £Flash
• Error £Flash (after10m) 2 time
4 sec(10mm)
SMPS • Error £Reboot £Flash
• Error £Flash 3 time
4 sec
BT/WiFi • Cold Boot £30 sec after module starts 4 time
20~30 sec
AOC • Cold Boot £30 sec aftermodule starts
• Signal level below threshold 5 time
4 sec(30sec)
cold Boot
4-1
4. Troubleshooting

How to COLD BOOT the TV
1. 
2. 

• When wrong OCB is connected to TV and power
consumption is different, an errormessage will display
• If wrong OCB is connected to TV but powerconsumption is
the same, an errormessage will not display
-See chart below for details
OCB SMPS Power Consumption Type
No OCB SMPS TYPE
(in Factory Menu) Matching Model Code Matching Panel Type PowerConsumption
165Q900 QRQ900 65A1ME9TN 400W
275Q900 QRQ900 75A1ME9TN 480W
482Q900 QRQ900 82A1ME9TN 650W
585Q900 QRQ900 85L1ME9TN 650W
4-2
4. Troubleshooting

4-2. Function Control Operation Test
[On Screen Selections with Function Control]
FUNCTION/IR Control Test
1. Place TV in Power Standby :
2. Check LED Status
3. If LED is OFF ( & LED should be on with menu setting)
9
• 
4. If LED is ON
9Switch Operation activates on screen display
• If missing:
9
• If wrong voltage orno change:
9
5. 
6. 
• 
LED STATUS/SWITCH
TO CN1501
4-3
4. Troubleshooting

4-3. Power
CNM803A
CN9003A
FUSE
CNM803A (SMAW250-H26S5)
1B-GND 2B-GND 3 4 5 B350V 6 B350V
7 8 9GND 10 GND 11 VAMP 12 B13V
13 VAMP 14 B13V 15 VAMP 16 B13V 17 GND 18 GND
19 PS_ON 20  21  22  23 GND 24 GND
25 GND 26 GND
CN9003A (05002HR-H24J05)
1 GND 2  35V 45V 5 6 GND
7SDA_LED 8SDA_LED 9 GND 10 SERIAL_
DATA 11 GND 12 GND
13 SERIAL_
UHR 14 GND 15 GND 16 SERIAL-STT 17 VSTNC_IN 18 BLU_ON_OFF
19 GND 20 CONTACT 21 TEST_SD 22 TEST_LD 23 GND 24 GND
4-4
4. Troubleshooting

4-3-1. TV POWER STANDBY TEST
1. TV in Standby
9Standby LED Indicator (Note: Status can be changed in usermenu and may default off)
2. If Not Lit: (and should have been lit with status setting)
9B350V Line / One Connect Cable
3. If missing:
9One Connect Cable status
4. If TV does not poweron:
9Resistance on SMPS FUSE
5. If fuse is open:
9
6. If fuse is OK:
9Standby: A13V
9replace Main Board
7. If still missing:
9replace ONE Connect Cable.
4-3-2. TV POWER ON SEQUENCE TEST
1. PowerTV On
9PS_ON .2Vdc (when off) changes to 3.3Vdc (on)
• 
2. If voltage error or no change:
9Jog Function & IR Control Test
3. If OK :
9Check a connecting status of One Connect Cable between TV and OC
9Remove and reconnect the AC power cord
9Change One Connect Cable
4. IF TV still won’t poweron
9All A13V supplies forapprox.12.7VDC(CDR)
9All Vamp supplies forapprox.18 VDC
5. If any wrong voltages:
9Replace SMPS
6. If still wrong voltage:
9replace TV Board and OC Box
7. Backlight ON
9Backlight On/Off 
9replace TV Board or OC Box
4-3-3. SMPS/PANEL BACKLIGHT TEST
9
9We can't SMPS/PANEL Backlight test without OC Box and TV Board
9If we use OC Box and TV Board, It is the same test condition as TV POWER SEQUENCE TEST
4-5
4. Troubleshooting

4-4. Video
4-4-1. ONE CONNECT
Main Section
Video Operation
• If No Video
9Check connection status of One Connect Cable
9Reconnect One Connect Cable both side (TV and OCL)
• If NG:
9Replace One Connect Box / Cable (defective)
9TV MAIN (defective)
4-6
4. Troubleshooting

4-4-2. MAIN/T-CON BOARD
• Scaller& US Post of KANT-M2 Main CPU Section £ PRE FRC Main Section £ POST FRC Main Section £ T-CON Section
Scaller& US Post of KANT-M2 Main CPU Section
CustomerPicture Test 1 Mute >1 > 4 > 7 > Mute
Video Operation

• If OK:
9Source & Input Cables
9Other inputs
• If Noisy:
9Pre Scaler Patterns
9US Post Patterns
9Pre FRC Pattern
PRE FRC Main Section
PRE FRC (Factory Mode)
Video Operation

• If OK:
9Check/Replace defective TV Main Board
• If Noisy:
9Post FRC Pattern
4-7
4. Troubleshooting

POSTFRC Main Section
POST FRC (Factory Mode)
Video Operation
Generated at Post FRC in TV Main Board
• If OK:
9Check/Replace defective TV Main Board
• If Noisy:
9Mute £ 3 £ 6 £ 9 £ Mute
T-CON Section
Mute > 3 > 6 > 9 > Mute

Video Operation
Generated at T-CON Section in TV Main/T-CON
1. If OK:
9Check/Replace defective TV Main/T-CON Board
2. If Noisy:
9Main/T-CON Board
9Panel
4-8
4. Troubleshooting

4-4-3. PANEL
1. If NoisyVideo:
9Soc T-CON Pattern in Factory Mode
• 
• 
• 
2. If No Video & Back Lights are OK (on):
9If sound is OK check Panel13Vdc supplies to Panel
9If No sound replace TV Main Board
4-9
4. Troubleshooting