Samsung HG43NT678UF User manual

UHD TV
SERVICEManual
Hospitality Displays Contents
1. Precautions
2. Product specications
3. Disassembly and Reassembly
4. Troubleshooting
5. Wiring Diagram
HG50NT678UF
Project : HT670U
Chassis : HWP01
Model : HG43NT678UF
HG50NT678UF
HG55NT678UF
HG65NT678UF

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. Other Information ............................................................................................................................ 2-3
2-3. Accessories........................................................................................................................................ 2-8
2-4. Viewing the Functions..................................................................................................................... 2-9
2-5. About the Buttons on the Remote Control ................................................................................2-14
2-6. Using the TV Controller..................................................................................................................2-16
2-7. Hotel Option menu items...............................................................................................................2-17
2-8. Supported subtitles....................................................................................................................... 2-23
3. Disassembly and Reassemble ............................................................................................ 3-1
3-1. TV Disassembly ..................................................................................................................................3-1
4. Troubleshooting................................................................................................................... 4-1
4-1. Function/IR .........................................................................................................................................4-1
4-1-1. Function Test ..........................................................................................................................4-1
4-1-2. IR Test ......................................................................................................................................4-1
4-2. Power.................................................................................................................................................. 4-2
4-2-1. TV POWER STANDBY Test ................................................................................................... 4-6
4-2-2. TV POWER STANDBY Test....................................................................................................4-7
4-2-3. Backlight Test..................................................................................................................... 4-10
4-3. Video................................................................................................................................................. 4-13
4-3-1. Customer Picture Test ....................................................................................................... 4-13
4-3-2. Test Patterns....................................................................................................................... 4-14
4-3-3. MAIN BOARD...................................................................................................................... 4-15
4-4. Audio .................................................................................................................................................4-17
4-5. Factory Mode .................................................................................................................................. 4-18
4-6. Replacing Main Board...................................................................................................................4-24
4-7. Detail Factory Option .....................................................................................................................4-29
4-8. Factory Data.................................................................................................................................... 4-33
4-9. AV Control Tabe ..............................................................................................................................4-46
4-10. Updating the TV’s Software .......................................................................................................4-53

5. Wiring Diagram .................................................................................................................... 5-1
5-1. Wiring Diagram ..................................................................................................................................5-1
5-2. Connector........................................................................................................................................... 5-2
5-2-1. MAIN Board ........................................................................................................................... 5-2
5-2-1. DC VSS-PD BOARD............................................................................................................... 5-6
5-3. Cables ............................................................................................................................................... 5-10

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.
© 2020 Samsung Electronics Co.,Ltd.
All rights reserved.
Printed in Korea

1. Precautions
1-1. Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1-1. Warnings
WARNING
For continued safety, do not attempt to modify the circuit board.
Disconnect the AC power and DC power jack before servicing.
1-1-2. Servicing the LED TV
1. When servicing the LED TV, Disconnect the AC line cord from the AC outlet.
2. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this
meter periodically.
1-1-3. Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks:
1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the
chassis and other metal parts in the monitor.
2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and
compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.
3. Leakage Current Hot Check:
DEVICE
UNDER
TEST
(READING SHOULD)
NOT BE ABOVE 0.5mA LEAKAGE
CURRENT
TESTER
TEST ALL EXPOSED
METAL SURFACES
2-WIRE CORD
ALSO TEST WITH PLUG
REVERSED (USING AC
ADAPTER PLUG AS
REQUIRED)
EARTH
GROUND
WARNING
Do not use an isolation transformer during this test.
Use a leakage current tester or a metering system that complies with American National Standards
Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL
Publication UL1410, 59.7).
4. With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch rst
in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.)
and all exposed metal parts, including: metal cabinets, screwheads and control shafts.
The current measured should not exceed 0.5 milliamp.
Reverse the power-plug prongs in the AC outlet and repeat the test.
1-1
1. Precautions

1-2
1. Precautions
1-1-4. Product Safety Notices
Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual
inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage,
wattage, etc. Parts that have special safety characteristics are identied by on schematics and parts lists. A substitute
replacement that does not have the same safety characteristics as the recommended replacement part might create
shock, re and/or other hazards. Product safety is under review continuously and new instructions are issued whenever
appropriate.
WARNING
Wear protective equipment (gloves, safety goggles, etc) to prevent injuries and electrical shock that may
occur during TV product disassembly/repair.

WARNING
An electrolytic capacitor installed with the wrong polarity might explode.
CAUTION
Before servicing units covered by this service manual, read and follow the Safety Precautions section of
this manual.
NOTE
If unforeseen circumstances create conict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
1-2-1. General Servicing Precautions
1. Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting
to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test
component in parallel with an electrolytic capacitor.
2. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The
internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to
their original position.
3. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the
area around the serviced part has not been damaged.
4. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input
terminals and earphone jacks).
5. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an
insulation resistance meter (500 V) to theblades of the AC plug. The insulation resistance between each blade of the AC
plug and accessible conductive parts (see above) should be greater than 1 megohm.
6. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead;
always remove the instrument’s ground lead last.
1-3
1. Precautions
1-2. Servicing Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some eld-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your
body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be
sure to remove the wrist strap before applying power to the monitor.
2. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent
accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.
4. Use only a grounded-tip soldering iron to solder or desolder ESDs.
5. Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ESDs.
6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs
are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive
materials.
7. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
CAUTION
Be sure no power is applied to the chassis or circuit and observe all other safety precautions.
8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or
lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.
1-4
1. Precautions
1-3. Static Electricity Precautions

1. For safety reasons, more than a people are required for carrying the product.
2. Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.
3. Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal temperature
may cause re.
4. Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to
moisture. Otherwise, it may cause a re or electric shock.
5. Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check
the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric
shock.
6. Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the
antenna falling over may cause re or electric shock.
7. When installing the product, leave enough space (0.4m) between the product and the wall forventilation purposes.
A rise in temperature within the product may cause re.
8. If an equipment is provided with a replaceable battery, and if replacement by an incorrect type could result in an
explosion (for example, with some lithium batteries), the following applies:
CAUTION
−Risk of explosion if battery is replaced by an incorrect type dispose of used batteries according to
the instructions.
− Do not dispose of batteries in a re.
−Do not short circuit, disassemble or overheat the batteries.
−Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent
type.
− Do not be exposed to excessive heat such as sunshine, re or the like.
1-5
1. Precautions
1-4. Installation Precautions

2-1
2. Product specications
2. Product Specications
2-1. Product Information
Model HG**NT678UF
Front View
W
* W : Width H : High D : Depth
H
D
Detail View
Color Front : BLACK / Stand : BLACK
Dimensions
(W x H x D)
43"
Body 37.9 x 22.0 x 2.3 inches (963.9 x 558.9 x 59.6 mm)
With Stand 37.9 x 24.1 x 8.9 inches (963.9 x 610.9 x 226.5 mm)
50"
Body 44.0 x 25.4 x 2.4 inches (1116.8 x 644.2 x 59.9 mm)
With Stand 44.0 x 27.4 x 8.9 inches (1116.8 x 696.8 x 226.5 mm)
55"
Body 48.4 x 27.8 x 2.4 inches (1230.5 x 707.2 x 59.9 mm)
With Stand 48.4 x 29.9 x 8.9 inches (1230.5 x 759.8 x 226.5 mm)
Weight
43"
Without Stand 19.0 lbs (8.6 kg)
With Stand 26.0 lbs (11.8 kg)
50"
Without Stand 26.2 lbs (11.9 kg)
With Stand 33.3 lbs (15.1 kg)
55"
Without Stand 31.5 lbs (14.3 kg)
With Stand 38.6 lbs (17.5 kg)

2-2
2. Product specications
Model HG65NT678UF
Front View
W
* W : Width H : High D : Depth
H
D
Detail View
Color Front : BLACK / Stand : BLACK
Dimensions
(W x H x D) 65"
Body 57.1 x 32.7 x 2.4 inches (1449.4 x 830.3 x 59.9 mm)
With Stand 57.1 x 35.7 x 11.1 inches (1449.4 x 906.6 x 282.1 mm)
Weight 65"
Without Stand 46.5 lbs (21.1 kg)
With Stand 47.2 lbs (21.4 kg)

2-3
2. Product specications
2-2. Other Information
NOTE

Item HG**NT678UFXZA
43 50 55 65
General
Information
 LED
 UNITED STATES
Display  43 50 55 65
Resolution 3,840 x 2,160
Video  
 N/A
Auto Motion Plus Yes
Film Mode Yes
 Yes
Motion Rate 120
 1300
HDR(High Dynamic Range) HDR
HDR10+ Yes
 Yes
 
 
 178/178
 N/A
 Yes
Audio Dolby Digital Plus Yes
Sound Output (RMS) 20W
 2CH
 N/A
Smart TV Samsung SMART TV N/A
 N/A
TV Plus N/A
 N/A
 N/A
 N/A
 N/A

2-4
2. Product specications
Item HG**NT678UFXZA
43 50 55 65
VESA VESA Mount 200 x 200
mm
200 x 200
mm
200 x 200
mm
400 x 300
mm
 M8
 20-22
Convergence  N/A
 N/A
 N/A
 N/A
Easy Setup N/A
 N/A
 N/A
TV Sound to Mobile N/A
 N/A
General
Feature
Accessibility US English
 Yes
 Yes
 Yes
Caption (Subtitle) Yes
 Yes
 Yes
EPG Yes
Game Mode Yes
OSD Language





 N/A
BT HID Built-in N/A
 Yes
Teletext (TTX) N/A
Ambient Mode N/A
 N/A
V-Chip Yes
 N/A
 N/A

2-5
2. Product specications
Item HG**NT678UFXZA
43 50 55 65
System  
 Yes
 N/A
 N/A
Hospitality
Feature
 N/A
 N/A
 N/A
 REACH 4.0
Hospitality Home Menu Home Menu 2017
 N/A
Hospitality Plug&Play (Easy Set-up) Yes
 Yes
 Yes
Hotel Channel List Yes
Channel Menu Display Yes
Mixed Channel List (ATSC, DVB-T/T2/C/S2,
Analog) Yes
My Channel Yes
 Yes

Movie) Yes
Welcome Message Yes
 Yes
 No
Clock Back Up Supply Yes
 No
 N/A
 Yes
 Yes
 Yes
Music Mode (Input: PC/AV/Component/
HDMI) Yes
Music Mode Backlight on/off N/A
TTX Clock Update (Analogue) No
USB Cloning Yes

2-6
2. Product specications
Item HG**NT678UFXZA
43 50 55 65
Smoovie Compatibility Yes
Soft AP N/A
 Yes
 Yes
 Yes
 Yes
bLAN Yes
 Yes
S/W EPG (Solution EPG) Yes
 No
 N/A
Input & Output HDMI 3/0
USB 2
 N/A
Composite In (AV) N/A
 N/A
Headphone N/A
Audio Out (Mini Jack / LR) N/A
Digital Audio Out (Optical) 1

Input) 
 1
CI Slot N/A
 Yes
WiFi N/A
Anynet+ (HDMI-CEC) Yes
 No
 N/A
 N/A
Video Out N/A
RJ12 0/1
RJP (Remote Jackpack) N/A
Headphone ID N/A
 No

2-7
2. Product specications
Item HG**NT678UFXZA
43 50 55 65
 No
 No
PC/DVI Audio In (Mini Jack) No
 N/A
Design  BLACK
Stand Type SQUARE SQUARE SQUARE SLIM FEET
 Yes
 
Light Effect (Deco) N/A
Eco  Yes
 Yes
Power  
 105 W 135 W 135 W 190 W
 N/A
 0.5 W
 51 W 61 W 62 W 80 W

2-8
2. Product specications
2-3. Accessories
NOTE
 
 
 
 "Exploded Views"
 

(Not available in some locations)
AA59-00817A/4301-000103

3903-001117
Quick Setup Guide
(Not available in some locations)
BN68-11047P

(Not available in some locations)
BN68-09367A
Hotel Mount Kit (43"-55")
BN96-23066A
Cable Guide (43"-55")
BN61-08370A

2-9
2. Product specications
2-4. Viewing the Functions
Create a premium guest experience



Crisp and vivid color expression



2-10
2. Product specications
UHD-quality content delivery



Rened picture quality




2-11
2. Product specications
A tailored home menu



Powerful performance, enhanced security

