Samsung SyncMaster T23A750 User manual

SERVICEManual
TFT-LCD Monitor Contens
1. Precautions
2. Product specications
3. Disassembly and Reassemble
4. Troubleshooting
5. Wiring Diagram
LCD-Monitor
Chassis : WDU1
Model : T23A750
T27A750
T23A750 / T27A750

Contents
1. Precautions.............................................................................................................. 1-1
1-1. Safety Precautions ......................................................................................................... 1-1
1-2. Servicing Precautions..................................................................................................... 1-2
1-3. Static Electricity Precautions .......................................................................................... 1-3
1-4. Installation Precautions .................................................................................................. 1-3
2. Product specications............................................................................................ 2-1
2-1. Feature & Specications................................................................................................. 2-1
2-2. Spec Comparison to the Old Models.............................................................................. 2-3
2-3. Accessories .................................................................................................................... 2-4
3. Disassembly and Assembly ................................................................................... 3-1
3-1. Disassembly ................................................................................................................... 3-1
4. Troubleshooting ...................................................................................................... 4-1
4-1. First Checklist for Troubleshooting ................................................................................. 4-1
4-2. No Power........................................................................................................................ 4-2
4-3. HDMI No Screen ............................................................................................................ 4-8
4-4. Faults and Corrective Actions....................................................................................... 4-13
4-5. Adjustment.................................................................................................................... 4-14
4-6. How to Access Service Mode ...................................................................................... 4-14
4-7. White Balance - Calibration .......................................................................................... 4-17
4-8. White Ratio (Balance) Adjustment................................................................................ 4-18
4-9. Servicing Information.................................................................................................... 4-19
4-10. Software Upgrade....................................................................................................... 4-20
4-11. Micom Program Upgrade........................................................................................... 4-21
5. Wiring Diagram........................................................................................................ 5-1
5-1. Wiring Diagram............................................................................................................... 5-1
5-2. Board Connection........................................................................................................... 5-3
5-3. Connector Functions ...................................................................................................... 5-4
5-4. Cables ............................................................................................................................ 5-4

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.
© 2011 Samsung Electronics Co.,Ltd.
All rights reserved.
Printed in Korea

3-1
3. Disassembly and Assembly
3. Disassembly and Assembly
This section describes the disassembly and reassembly sequences for this monitor.
As this monitor has parts that are sensitive to static electricity, be careful when
handling them.
3-1. Disassembly
Turn the monitor off before beginning the disassembly process.1.
When disassembling the monitor, do not use any metal tools except for the2.
provided jig.
Disassemble the monitor carefully as directed in the following procedures.3.
Description Photo
1. Pull and separate the REAR SUB in the
direction of the arrows.
2. Unfastened the 4 screws, disconnect
the 2 cables, then separate the stand.
Screw
6001-001114
4 EA

3-2
3. Disassembly and Assembly
Description Photo
3. Remove the 2 screws from the COVER
REAR, and separate the COVER
FRONT starting from the upper part as
shown in the image.
Screw
6001-001114
2 EA
* Internal locking tabs on the front and
back covers.
4. Turn the product over, and separate the
COVER REAR as shown in the image.

3-3
3. Disassembly and Assembly
Description Photo
5. Remove the tape as shown in the
image.
6. Remove the jacks and cables from
the main board, and separate the
speakers.

3-4
3. Disassembly and Assembly
Description Photo
7. Remove the LVDS cable.
* When you reassemble, be careful not
to reverse LVDS cable. The direction
of the cable is printed on it. (‘Panel’,
‘Main’)

3-5
3. Disassembly and Assembly
Description Photo
8. Remove the 4 screws, and separate
the main board.
Screw
6003-000264
4 EA

3-6
3. Disassembly and Assembly
Description Photo
9. Remove the LVDS cable. Then remove
the HOLDER from the main board
and BRACKET AV, and separate the
BRACKET AV.
* New type of LVDS connector applied
to 11’ model.(Double locking)
1. Flip up the locking tab on top of the
connector.
2. Squeeze the edge of the connector
to release the second tab lock and
gently pull the connector away.
10. Separate the BRACKET PCB.

3-7
3. Disassembly and Assembly
Description Photo
11. Separate the COVER STAND REAR.
12. Remove the 4 screws, and separate
the HINGE and STAND NECK.
Screw
6003-001374
4 EA

3-8
3. Disassembly and Assembly
Description Photo
13. Separate the STAND MIDDLE.
14. Remove the 4 screws from the STAND
BOTTOM.
Screw
6003-001785
4 EA

3-9
3. Disassembly and Assembly
Description Photo
15. Separate the STAND TOP.
※ Reassembly procedures are in the reverse order of disassembly procedures.
Screw Size
Code No. A (mm) B (mm) C (mm) Q’ty
6001-001114 8 6 4 6 EA
6003-000264 6 6 3 4 EA
6003-001374 8 12 4 4 EA
6003-001785 8 8 4 5 EA

1-1
1. Precautions
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
For continued safety, do not attempt to modify the circuit board.1.
Disconnect the AC power and DC power jack before servicing.2.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.1.
It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this2.
meter periodically.
1-1-3. Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks:
Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the1.
chassis and other metal parts in the monitor.
Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and2.
compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.
Leakage Current Hot Check (Figure 1-1):3.
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).
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 Figure 1-1. Leakage Current Test Circuit
With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch rst 4.
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.

1-2
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.
1-2. Servicing Precautions
An electrolytic capacitor installed with the wrong polarity might explode.
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
Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting1.
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.
Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used.2.
The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements
to their original position.
After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the3.
area around the serviced part has not been damaged.
Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input4.
terminals and earphone jacks).
Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.5.
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.
Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead;6.
always remove the instrument’s ground lead last.

1-3
1. Precautions
1-3. Static Electricity 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.
Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your1.
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.
After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent2.
accumulation of an electrostatic charge.
Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.3.
Use only a grounded-tip soldering iron to solder or desolder ESDs.4.
Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate 5.
electrical charges sufcient to damage ESDs.
Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs6.
are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive
materials.
Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material7.
to the chassis or circuit assembly into which the device will be installed.
Be sure no power is applied to the chassis or circuit and observe all other safety
precautions.
Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together,8.
or lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.
1-4. Installation Precautions
Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.1.
Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal temperature2.
may cause re.
Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to3.
moisture. Otherwise, it may cause a re or electric shock.
Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check4.
the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric
shock.
Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the 5.
antenna falling over may cause re or electric shock.
When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.6.
A rise in temperature within the product may cause re.

2-1
2. Product specications
2. Product specications
2-1. Feature & Specications
Feature
Supreme Digital Interface & Networkingሪ
With a built-in ATV&DTV tuner, it supports TV with no particular set-top box and provides simple access with a -
single remote control.
Excellent Picture Qualityሪ
Dynamic Contrastሪ
Automatically detects the input visual signal and adjusts to create optimum contrast.-
ATV&DTV Tuner, HDMI, Stereo, SRS Trusurround HD supportሪ
Convenienceሪ
The TV utilizes the HDMI system to implement perfect digital sound and picture quality.-

2-2
2. Product specications
Specications
Item Description
Model T23A750 T27A750
LCD Panel TFT-LCD panel, RGB vertical stripe, normally white transmissive
23” Wide viewable
0.2655(H) x 0.2655(W) mm pixel pitch
27” Wide viewable
0.31125(H) x 0.31125(W) mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 81 kHz (Automatic)
Vertical: 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.7 Million colors (Hi-FRC)
Maximum resolution Horizontal: 1920 Pixels
Vertical: 1080 Pixels
Input Signal HDMI(DVI) : TMDS positive at 75Ω, internally terminated
Maximum Pixel Clock rate 148.5 Mhz
Active Display
(Horizontal/Vertical) 509.76(H) x 286.74(V) 597.6(H) x 336.15(V)
AC power voltage &
Frequency AC 100~240V, 50~60Hz
Power Consumption 65 W < 0.5 Watt (Swtich offf)
DPMS: 1.5 Watt
70 W < 0.5 Watt (Swtich offf)
DPMS: 1.5 Watt
Dimensions Set
(W x D x H)
543.4 x 405.4 x 190.9 mm (with Stand)
543.4 x 321.0 x 34.0 mm (without Stand)
631.2 x 454.2 x 190.9 mm (with Stand)
631.2 x 370.4 x 34.0 mm (without Stand)
Weight Set
(After installation Stand)
6.0 Kg (with Stand)
8.19 Kg (Package)
6.85 Kg (with Stand)
9.5 Kg (Package)
TV System Tuning: Frequency Synthesize
[US/Canada]
System: NTSC 3.58, ATSC
Sound: M
[EU/CIS/Australia/New Zealand/Singapore]
System: PAL, SECAM, NT 443, ATSC
Sound: BG/DK/I/L/L’
[Brasil]
System: PAL, NTSC 3.58, ATSC
Sound: M/N
Environmental Considerations Operating Temperature: 50˚C ~ 104˚F(10˚C ~ 40˚C)
Operating Humidity : 10% ~ 80%
Storage Temperature: -4˚C ~ 113˚C(-20˚C ~ 45˚C)
Storage Humidity: 5% ~ 95%
Antenna Input 75Ω
Sound Characteristic - MAX Internal speaker Out : Right(7W) / Left(7W)
- BASS Control Range : -8 dB ~ + 8dB
- TREBLE Control Range : -8 dB ~ +8 dB
- Headphone Out : 10 mW MAX
- Output Frequency : RF : 80 Hz ~ 15 kHz
- A/V : 80 Hz ~ 20 kHz
Note: Designs and specications are subject to change without prior notice.

2-3
2. Product specications
2-2. Spec Comparison to the Old Models
Model [TA750]
T23A750 / T27A750
[90-MFM]
FX2490HD
Design
Screen Size 23” / 27” 24”
Resolution 1920X1080(FHD) 60Hz 1920X1080(FHD) 60Hz
Brightness T23A750 : 250cd/m2
T27A750 : 300cd/m2250cd/m2
Contrast Ratio 1000:1 1000:1
Response Time 3ms 5ms
Viewing Angle Left/Right/Up/Down : 85˚/85˚/80˚/80˚ Left/Right/Up/Down : 80˚/80˚/80˚/80˚
PC Input DVI(HDMI) D-SUB, DVI(HDMI)
Power Consumption T23A750 : 65 W <0.5 Watt(Switch off)
T27A750 : 70 W <0.5 Watt(Switch off) 35W<0.3W
DPMS Less than 1.5 Watt Less than 0.3W
Sound Output 7W X 2 5W x 2
Dynamic Contrast Ratio MEGA DCR:1 MEGA DCR:1
Sound Effect
Dolby Digital Plus
Dolby Digital Pulse
DTS
SRS Theater sound
Dolby Digital Plus
Dolby Digital Pulse
DTS
SRS Theater sound

2-4
2. Product specications
2-3. Accessories
Product Description Code. No Remark
Safety Guide AA68-03242L
[Model Standard of
LT23A750ND/ZA]
Samsung Electronics
Service center
Warranty Card
(Not available in all locations) BN68-02001A
User Manual BN68-03598A
Cleaning Cloth BN63-01798B
Remote Control & Batteries
(AAA x 2)
[USA/Canada]
AA59-00442A
[EU/CIS]
AA59-00445A
[Brasil]
AA59-00451A
[Australia/New
Zealand/Singapore]
AA59-00445A
+
+
-
-
Batteries
(AAA x 2) 4301-000121
Adapter BN44-00455A
Scart Gender BN39-01154X
(EU Only)

2-5
2. Product specications
Product Description Code. No Remark
Power Cord
[USA/Canada]
3903-000598
[EU/CIS]
3903-000525
[Brasil]
3903-000532
[Australia/New
Zealand/Singapore]
3903-000563
[Model Standard of
LT23A750ND/ZA]
Samsung Electronics
Service center
HDMI Cable BN39-01502A
Component Gender BN39-01154W
Stereo Cable BN39-01286A
3D Glasses Assy BN96-18236A
S/W DRIVER-TRIDEF 3D BN46-00078D