Samsung T23A750, T27A750 Schematic

LCD-Monitor

Chassis : WDU1

Model : T23A750

T27A750

Manual

SERVICE

TFT-LCD Monitor Contens

1. Precautions

2. Product specications

3. Disassembly and Reassemble

4. Troubleshooting

5. Wiring Diagram

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. 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 the 2.

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.

3. Disassembly and Assembly

2. Unfastened the 4 screws, disconnect
the 2 cables, then separate the stand.

Screw

6001-001114

4 EA

3-1

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. 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 this 2.
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 the 1.
chassis and other metal parts in the monitor.

Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and 2.
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).

(READING SHOULD)
NOT BE ABOVE 0.5mA

DEVICE
UNDER
TEST

2-WIRE CORD

*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)

TEST ALL
EXPOSED METAL
SURFACES

LEAKAGE
CURRENT
TESTER

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.

1-1

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 attempting 1.
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 the 3.
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, input 4.
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 your 1.
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 prevent 2.
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 ESDs 6.
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 material 7.
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 temperature 2.

may cause re.

Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to 3.

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 check 4.

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. Product specications

2-1. Feature & Specications

Supreme Digital Interface & Networking ሪ

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 Quality ሪ

Dynamic Contrast ሪ

Automatically detects the input visual signal and adjusts to create optimum contrast. -

ATV&DTV Tuner, HDMI, Stereo, SRS Trusurround HD support ሪ

Convenience ሪ

The TV utilizes the HDMI system to implement perfect digital sound and picture quality. -

2. Product specications

Feature

2-1

2-2

2. Product specications

Item Description

Model T23A750 T27A750

LCD Panel

Specications

TFT-LCD panel, RGB vertical stripe, normally white transmissive

23” Wide viewable

0.2655(H) x 0.2655(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

Input Signal HDMI(DVI) : TMDS positive at 75Ω, internally terminated

Maximum Pixel Clock rate 148.5 Mhz

Active Display
(Horizontal/Vertical)

AC power voltage &
Frequency

Power Consumption 65 W < 0.5 Watt (Swtich offf)

Dimensions Set
(W x D x H)

Weight Set

(After installation Stand)

TV System Tuning: Frequency Synthesize

Environmental Considerations Operating Temperature: 50˚C ~ 104˚F(10˚C ~ 40˚C)

Antenna Input 75Ω

Sound Characteristic - MAX Internal speaker Out : Right(7W) / Left(7W)

Note: Designs and specications are subject to change without prior notice.

Horizontal: 1920 Pixels

Vertical: 1080 Pixels

509.76(H) x 286.74(V) 597.6(H) x 336.15(V)

AC 100~240V, 50~60Hz

DPMS: 1.5 Watt

543.4 x 405.4 x 190.9 mm (with Stand)

543.4 x 321.0 x 34.0 mm (without Stand)

6.0 Kg (with Stand)

8.19 Kg (Package)

[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

Operating Humidity : 10% ~ 80%

Storage Temperature: -4˚C ~ 113˚C(-20˚C ~ 45˚C)

Storage Humidity: 5% ~ 95%

- 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

27” Wide viewable

0.31125(H) x 0.31125(W) mm pixel pitch

70 W < 0.5 Watt (Swtich offf)

DPMS: 1.5 Watt

631.2 x 454.2 x 190.9 mm (with Stand)

631.2 x 370.4 x 34.0 mm (without Stand)

6.85 Kg (with Stand)

9.5 Kg (Package)

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/m
T27A750 : 300cd/m

2

2

250cd/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

Warranty Card

(Not available in all locations)

User Manual BN68-03598A

Cleaning Cloth BN63-01798B

Remote Control & Batteries

(AAA x 2)

BN68-02001A

[USA/Canada]

AA59-00442A

[EU/CIS]

AA59-00445A

[Brasil]

AA59-00451A

[Model Standard of

LT23A750ND/ZA]

Samsung Electronics

Service center

[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

[USA/Canada]

3903-000598

[EU/CIS]

3903-000525

Power Cord

HDMI Cable BN39-01502A

[Brasil]

3903-000532

[Australia/New

Zealand/Singapore]

3903-000563

Component Gender BN39-01154W

Stereo Cable BN39-01286A

3D Glasses Assy BN96-18236A

S/W DRIVER-TRIDEF 3D BN46-00078D

[Model Standard of

LT23A750ND/ZA]

Samsung Electronics

Service center

4. Troubleshooting

4. Troubleshooting

4-1. First Checklist for Troubleshooting

Self-Test Feature Check 

Your monitor provides a self test feature that allows you to check whether your monitor is functioning properly.

Turn off both your computer and the monitor. 1.

Unplug the video cable from the back of the computer2.

Turn on the monitor. 3.
If the monitor is functioning properly, you will see a box in the illustration below. .

This box appears during normal operation if the video cable becomes disconnected or damaged.

4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
If your monitor screen remains blank after using the previous procedure, check your video controller and
computer system; your monitor is functioning properly.

Warning Messages 

If there is something wrong with the input signal, a message appears on the screen or the screen goes blank although
the power indicator LED is still on. The message may indicate that the monitor is out of scan range or that you need to
check the signal cable.

Environment 

The location and the position of the monitor may inuence the quality and other features of the monitor.

If there are any sub woofer speakers near the monitor, unplug and relocate the woofer to another room.

Remove all electronic devices such as radios, fans, clocks and telephones that are within 3 feet (one meter) of the
monitor.

Useful Tips 

▶ A monitor recreates visual signals received from the computer.

Therefore, if there is trouble with the computer or the video card, this can cause the monitor to become blank,

have poor coloring, noise, Video mode not supported, etc. In this case, rst check the source of the problem,

and then contact the Service Center or your dealer.

▶ Judging the monitor’s working condition

If there is no image on the screen or a “Not Optimum Mode”, “Recommended Mode 1920 X 1080 60Hz” message

comes up, disconnect the cable from the computer while the monitor is still powered on.

- If there is a message coming up on the screen or if the screen goes white, this means the monitor is in working

condition.

- In this case, check the computer for trouble.

4-1

4-2

4. Troubleshooting

4-2. No Power

Symptom

Major

checkpoints

The LED on the front panel of the monitor does not work when the power is connected and the ­Power button is pressed.

Check if the Power switch on the rear panel of the monitor has been turned on. -

Check the SMPS fuse and output power of power adapter. -

Check the power part of the Main Board and check if a similar symptom appears at another ­output terminal.

IC2001

IC1030

(Bottom side)

IC201

IC2010

IC206

IC202

IC207

(Bottom side)

Diagnostics

IC204

CN201

Does proper 14V appear at pin

No.1 of CN201? 1

Yes

Does proper 14V appear at

BD1020? 1

Does proper 5V appear at

BD237, BD240? 2

Yes

Does proper 3.3V, 1.5V and 1.2V

appear at pin BD235 ,BD216,

BD220 and BD226? 3 4

Yes

Does proper 1.1V appear at

BD221? 5

Yes

Change main board for

Scaler(IC1001) problem

No

No

No

No

Check DC Power Adapter

Check related circuit of IC1030,

IC2001 and IC2010.

Check related circuit of IC204,

IC201, IC206 and IC202.

Check related circuit of IC207.

Caution Make sure Power connection before checking the Main Board.

4-3

4. Troubleshooting

4-2-1. Circuit diagrams when the power does not turn on

4-4

4. Troubleshooting

4-5

4. Troubleshooting

4-6

4. Troubleshooting

4-7

4. Troubleshooting

4-2-2. Waveforms

1 2

3 4

5

4-8

4. Troubleshooting

4-3. HDMI No Screen

Symptom

Major

checkpoints

The LED power turns on but the screen is blank when the HDMI cable is connected. -

Check the HDMI cable connections. -

Check whether the LVDS cable is connected correctly to the panel. -

Check the circuit related HDMI input and scaler operation. -

CN201

IC1001

CN604

CN602

IC601

Does Function LED persists white

Diagnostics

Caution Make sure Power connection before checking the Main Board.

light after power on?

Yes

Dose proper 5V appear at pin No.

18 of CN604 or CN602?

Yes

Does proper signals appear at pin

No.91(SDA) 6 and No.92(SCL)7

of IC601?

Yes

Does proper clock signals

appear at pin NO.11,12, 23, 24

of CN604 or CN602? 8,9

Yes

Check connection between main

board and panel.

Change Panel.

No

No

No

No

Power adapter

Check HDMI cable connection

Change IC601.

Change main board

because of scaler problem

4-9

4. Troubleshooting

HDMI INPUT 1

BZB84-C6V2

6.2

TP

EXC28CG900U

MMBD4148SE

4.7KOHM

DGND DGND

47KOHM

DDC_5V_VCC

HMR41-AK5200

DGND

DEFAULT_RESISTOR_3300OHM_2_1

4.7KOHM

A3.3V_PW

DGND

10V

DGND

100

MMBD4148SE

100

100OHM

ADUC20S02010

10OHM

10OHM

DGND

20

22OHM

100NF

EXC28CG900U

DGND

R621

R620

R690_DD

R689_DD

FT601

FT602

CN602

RA602

R624

R627

D613

TP604

VT604

D601 D602

C617

6G5>

6E2<

6E2<

6E2<

6E2<

6E2<

6E2<

6E2<

6H5<

6E2<

6H5<

HDMI1_5V

HDMI1_HPD

SCL_DOWN

HDMI1_DDC_SCL

HDMI1_RXCLK+

HDMI1_RXCLK-

HDMI1_RX2-

HDMI1_IDENT

HDMI1_RX0+

HDMI1_RX1-

HDMI1_RX1+

HDMI1_RX0-

SDA_DOWN

HDMI1_RX2+

HDMI1_DDC_SDA

HDMI_CEC

876

54

321

876

54

321

MGND4

MGND3

MGND2

MGND1

9876543

2

191817161514131211

10

1

4

2

3

1

4-3-1. Circuit diagrams and waveforms (HDMI No Screen) when no screen is
displayed on the monitor

4-10

4. Troubleshooting

HDMI OPTICAL OUT

HDMI INPUT 2

EXC28CG900U

B14V_PW

STK7002

DEFAULT_RESISTOR_4700OHM_2_1

1/16W

4.7KOHM

1/16W

2KOHM

1/16W

18KOHM

1/16W

MMBD4148SE

10V

4.7UF

16V

-

DGND

22OHM

EXC28CG900U

820OHM

BAT721C

40

10V

100NF

AO5404E

DGND

10V

10UF

1/16W

47KOHM

DGND

HMR41-AK5200

TPS2051BDBVR

DGND

1/16W

47KOHM

47NF

DGND

A5V_PW

1/16W

DGND

330KOHM

DDC_5V_VCC

10KOHM

1/16W

DGND

DGND

DGND

4.7KOHM

10V

1UF

MMBD4148SE

47KOHM

100100

DGND

4.7KOHM

DGND

DGND

DGND

HDMI2_5V

DGND

STK7002

10KOHM

1/16W

A5V_PW

TPS2051BDBVR

DGND

FT604

FT603

R666

R665

Q610

R698

Q670

Q613

R667

R652

D660

Q614

R684

C611

IC622

R681

R683

TP603

CN604

R669

C685

IC621

C660

R626

R623

C616

D619

RA604

D615

C691

R690

6G5<

6F2<

6F2<

6G5<

6G2<

6G2<

6G2<

6G2<

6G2<

6G2<

MHL_AON

ARC2_SINGLE

HDMI2_RX1-

HDMI2_DDC_SCL

HDMI2_DDC_SDA

HDMI2_RXCLK-

HDMI2_RXCLK+

HDMI2_HPD

HDMI2_RX2+

HDMI2_RX2-

HDMI2_RX0+

HDMI2_RX0-

MHL_AON

MHL_AON

HDMI2_5V

MHL_AON

HDMI2_RX1+

876

54

321

876

54

321

5

43

2

1

MGND4

MGND3

MGND2

MGND1

9876543

2

191817161514131211

10

1

5

43

2

1

4

2

3

1

S

D

G

G

D

S

S

D

G

S

D

G

IN

EN

/OC

GND

OUT

IN

EN

/OC

GND

OUT

4-11

4. Troubleshooting

SII9489

DGND

100NF

C3.3V_PW

1/16W

100KOHM

1/16W

4.7KOHM

4.7KOHM

10V

100NF

100OHM

100OHM 1/16W

10V

1UF

1/10W

DGND

4.7UF

10V

DGND

C5V_PW

4.7KOHM

1/10W

0OHM

4.7KOHM

100NF

10V

10V

100NF

1/16W

4.7KOHM

C3.3V_PW

10V

100NF100NF

DGND

100NF

DGND

4.7KOHM

10V

10OHM

10V

4.7KOHM

4.7KOHM

10V

DGND

DGND

10V4.7KOHM

100NF

R646

ZC639

ZR628

ZR615ZR617

ZR616

IC601

SDA

SCL

C621

BD645

R610

R609

R608

R607

R604

R603

R680

C633C631C625

BD602

C629C623

R601

C622

R679

C604

C632

NRESET_OUT

SDA_TMDS

SCL_TMDS

9489_RESET

MHL_AON

HDMI_RXCLK+

HDMI_RX2+

HDMI_RX2-

HDMI_RX1+

HDMI_RX1-

HDMI_RX0+

HDMI_RXCLK-

HDMI_RX0-

MGND1

99

98

97

96959493929190898887868584838281807978777675747372717069686766

128

127

126

125

124

123

122

121

120

119

118

117

116

115

114

113

112

111

110

109

108

107

106

105

104

103

102

101

100

GPIO3

GPIO2

GPIO1

DSDA1

T1X2N

T1X1P

T1X1N

T1X0P

T1X0N

T1XCP

T1XCN

TCVDD12

TPVDD12

T0X2P

T0X2N

T0X1P

T0X1N

T1X0P

T1X0N

T0XCP

T0XCN

DVDD12

AVDD33

R0XCN

AVDD12

R0X2P

R0X2N

R0X1P

R0X1N

R0X0P

R0X0N

R0XCP

CBUS_HPD2

R2PWR5V

GPIO7

GPIO6

GPIO5

GPIO4

MICOM_VCC3

RSVDL

CEC_A0

CEC_A1

DSCL1

CBUS_HPD1

R1PWR5V

DSDA0

DSCL0

CBUS_HPD0

R0PWR5V

DSDA5(VGA)

DSCL5(VGA)

R5PWR5V(VGA)

CSDA

CSCL

SBVCC5

TX1_HPD

RSVDL

INT

TX1DSDA

TX1DSCL

TPWR_CI2CA

T1X2P

4-12

4. Troubleshooting

4-3-2. Waveforms

6 7

8 9

4-13

4. Troubleshooting

4-4. Faults and Corrective Actions

Fault Photo Symptoms and Corrective Actions Remarks

Symptoms: When the monitor is turned on, only a

full black screen is displayed continually
regardless of the signals.

Causes: This fault occurs due to a fault or incorrect

connections of the LVDS cable.

Corrective Actions: Replace or reconnect the LVDS

cable correctly.

Symptoms: When connecting the DVD, noise occurs

on the screen.

Causes: The HDCP key is not inserted.

Corrective Actions: Enter the HDCP key.

4-14

4. Troubleshooting

4-5. Adjustment

4-5-1. Service Instruction

Usually, a color TV-VCR needs only slight touch-up adjustment upon installation. 1.
Check the basic characteristics such as height, horizontal and vertical sync.

Use the specied test equipment or its equivalent.2.

Correct impedance matching is essential.3.

Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal 4.
markers, do not allow the marker generator to distort test result.

Connect the TV only to an AC power source with voltage and frequency as specied on the backcover nameplate.5.

Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is 6.
disconnected before replacing any parts.

To protect aganist shock hazard, use an isolation transform.7.

4-6. How to Access Service Mode

4-6-1. Entering Factory Mode

To enter “Service Mode” Press the remote -control keys in this sequence :

If you do not have Factory remote - control ሪ

[For Europe & Australia, New Zealand, Singapore]

If you have Factory remote - control ሪ

Key Functions

- Channel ∧∨,▲ ▼ Key : Select an option.

- Volume ＋－,◀▶ Key : Increase or decrease the value for an option.

- Menu key: Save the current settings to EEPROM and return to the previous mode.

- Number (0 ~ 9) keys: Change the channel.

- TV/AV key: Switch to AV mode.

4-6-2. Factory specications

* When you have replaced the main board, change the settings according to the following factory specications. Note

that the “Type” setting must be changed.

Model Name T23A750 T27A750

Panel

Vendor AMLCD AMLCD

CODE BN07-01011A BN07-01013A

1 Factory Reset - -

2 Type 23A1TF0E 27A1TF0E

3 Local set All All

4 Model TA750 TA750

5 TUNER - -

6 Ch Table - -

7 Front Color U-T-BL-M U-T-BL-M

4-15

4. Troubleshooting

4-6-3. Service Mode Menu

Initial display in service mode1.
Mode : DTV , RES : NOTSUPPORT

Option

Control

SVC

Expert

ADC/WB

Advanced

T-GASMAKUC-XXX

T-GENMAUSS1-XXX
E-Manual : MGSATSCA-xxxx

Main SW version

Sub SW version

e-manual version

EDID SUCCESS
CALIB : AV / COMP / PC / HDMI /
Option : 2022090012A

DTP-SDAL-GENS-XXXX

RFS : “GENOA_S_XXXX”
20XX-XX-XX
Onboot : 0065
GASFRC3D : XXXX
PARMA3D : XXXX
F-CT-MFM-XXX
Bluetooth: XXX

Function SW version

Bluetooth SW version

Type : 27A1TF0E
Model : LTXXA750
Wired MAC SUCCESS

DRM : Cert O Netix X Widevine X

Factory Data Ver : XXX
EERC Version : XXX
DTP-AP-COMP-645
DTP-BP-HAL-0130
DTP-BP-0623
Date Of purchase : XX/XX/XX

Date of the rst channel

2. Button functions in service mode

Menu Full Menu Display/Move to Parent Menu

Direction Keys ▲/▼ Item selection by Moving the Cursor

Direction Keys ◄/► Data Increase / Decrease for Selected Item

Source Cycles through the active input source that are connected to the

unit

4-16

4. Troubleshooting

Sub-Page of Service 

Option

Factory Reset

Type 27A1TF0E

Local Set US

Model TA750

Tuner

DDR

Light Effect OFF

Ch Table NONE

Front Color U-T-BL-M

ADC/WB

ADC

ADC Target

ADC Result

White Balance

SEC_Si2173

Control

EDID

Sub Option

PDP Option ...

Hosptality Option

Shop Option

Asia Option

Sound

Tuner Status

Cong Option

SCC

SVC

Test Pattern

Panel Auto Setting

PANEL DISPLAY TIME

T-CON USB
Download

T-CON CheckSum BT ADDRESS

CPLD USB Download Failure BT ADDRESS

REMOCON PAIRING X BT_AUDIO_ON_OFF OFF

TC905x7 FAN Step 7

MICOM UPGRADE off SVC Reset

MICOM POWER OFF OFF

Function UPGRADE off

Temp Last 60.00

Temp Read 0.00

DDC Version 0x0

DCC_CHK_SEL 0

Failure DCC_Check_Total 0x0

12Hr IR_ON_OFF OFF

Failure BT_ON_OFF ON

DCc_Check_Local

e4e0c53574a2

0x0

4-17

4. Troubleshooting

4-7. White Balance - Calibration

4-7-1 White Balance -Calibration

1. Calibration

4-7-2 Service Adjustment -

You must perform Calibration in the Lattice Pattern before adjusting the White Balance.

Color Calibration 

Adjust spec.

1. Source : PC

2. Setting Mode : 1024X768 60hz

3. Pattern : Pattern #24 (Chess Pattern)

PC Calibration

( Chess Pattern )

4. Use Equipment : CA210 & Master MSPG925 Generator

- Use other equipment only after comparing the result with that of the Master equipment.

Input mode Calibration Pattern

PC IN (Model_#21)

Perform in VESA XGA (1024x768)

B&W Pattern #24

<Table 1>

Method of Color Calibration (PC) 

1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port

2) Press the Source key to switch to “PC” mode

3) Enter Service mode

4) Select the “Calibration” menu

5) Select the “PC Calibration” menu.

6) In “PC Calibration Off” status, press the “ ” key to perform Calibration.

7) When Calibration is complete, it returns to the high-level menu.

8) You can see the change of the “PC Calibration” status from Failure to Success.

Lattice

4-18

4. Troubleshooting

4-7-3 White Balance - Adjustment

(low light) (hight light)

3. W/B

Sub Bright

R offset

G offset

B offset

Sub Contrast

R gain

G gain

B gain

(W/B adjustment Condition refer next page)

4-8. White Ratio (Balance) Adjustment

* All White Balance default value for TA750/TA950 is set in a factory line already. No need calibration and do White

balance again.

You can adjust the white ratio in factory mode (1:Calibration, 3:White-Balance).1.

Since the adjustment value and the data value vary depending on the input source, you have to 2.
adjust these in AV, Component and HDMI modes.

The optimal values for each mode are congured by default. (Refer to Table 1, 2) 3.
It varies with Panel’s size and Specication.

- Equipment : CA210

- Pattern: MIK K-7256 #92 “Flat W/B Pattern” as standard

- Use other equipment only after comparing the result with

that of the Master equipment.

- Set Aging time : 60min

- Calibration and Manual setting for WB adjustment.

HDMI : Calibration at #24 Chessboard Pattern Manual adjustment #92 pattern (720p)

COMP: Calibration at #24 Chessboard Pattern Manual adjustment at #92 pattern (720p)

AV: Calibration at #24 Chessboard Pattern Manual adjustment at #92 pattern (NTSC)

- If nishing in HDMI mode, adjustment coordinate is almost same in AV/COMP mode.

- White Balance Manual Adjustment

P-Mode

AV

(NTSC)

COMP
(720P)

HDMI

(720P)

x y Y(Luminance) T(K) + MPCD

H/L 281 288

L/L 281 288 Sub_Br:128 Fix 10,000(+0)

H/L 281 288

L/L 281 288 Sub_Br:128 Fix 10,000(+0)

H/L 281 288

L/L 281 288 Sub_Br:128 Fix 10,000(+0)

Adjustment Coordinate

26” - Sub_CT:165 Fix
32” - Sub_CT:150 Fix

26” - Sub_CT:165 Fix
32” - Sub_CT:150 Fix

26” - Sub_CT:165 Fix
32” - Sub_CT:150 Fix

10,000(+0)

10,000(+0)

10,000(+0)

- Adjustment Specication

White Balance : High light (±2), Low light (±3)

Luminance : High light (Don’t care), Low light (±0.2 Ft/L)

4-19

4. Troubleshooting

4-9. Servicing Information

4-9-1. USB Download Method

Samsung may offer upgrades for Monitor’s rmware in the future.
Upgrades will be possible by connecting a USB drive to the USB port located on your Monitor.

Insert a USB drive containing the rmware upgrade into the 1.
USB port on the rear of the Monitor.

Press the 2. MENU button to display the menu. Press the ▲ or ▼
button to select "Support", then press the ENTER button.

Press the ▲ or ▼ button to select "Software Upgrade", then 3.
press the ENTER button to select "By USB". The message
"Scanning for USB. It may take up to 1 minute." is displayed.

The message "Upgrade version XXXX to version XXXX? 4.
The system will be reset after upgrade." is displayed.
Press the ◄ or ► to select the "OK", then press the ENTER
button.

Please be careful to not disconnect the power or remove the USB
drive while upgrades are being applied. The Monitor will turn off

and turn on automatically after completing the rmware upgrade.
Please check the rmware version after the upgrades are

complete. When software is upgraded, video and audio settings
you have made will return to their default (factory) settings.
We recommend you write down your settings so that you can
easily reset them after the upgrade.

4-20

4. Troubleshooting

4-10. Software Upgrade

4-10-1. Program Upgrading - MAIN

1. If you select MENU → Support → Software Upgrade on remote control, you’ll see below picture.

2. Press ENTER, then you’ll see below picture. Select Yes

3. Micom program is now upgrading as below picture.
After Software Upgrade is process by 100%, the monitor is automatically turn off and on.

4-21

4. Troubleshooting

4-11. Micom Program Upgrade

1. Enter the Factory Mode and select the “SVC” menu.

Mode : COMP , RES : NOTSUPPORT

Option

Control

SVC

Expert

ADC/WB

Advanced

T-GASMAKUC-XXX

T-GENMAUSS1-XXX
E-Manual : MGSATSCA-xxxx

EDID SUCCESS
CALIB : AV / COMP / PC / HDMI /
Option : 2022090012A

DTP-SDAL-GENS-XXXX

RFS : “GENOA_S_XXXX”
20XX-XX-XX
Onboot : 0065
GASFRC3D : XXXX
PARMA3D : XXXX
F-CT-MFM-XXX
Bluetooth: XXX

Type : 27A1TF0E
Model : LTXXA750
Wired MAC SUCCESS

DRM : Cert O Netix X Widevine X

Factory Data Ver : XXX
EERC Version : XXX
DTP-AP-COMP-648-02
DTP-BP-HAL-0133-1
DTP-BP-0623-01
Date Of purchase : XX/XX/XX

4. Troubleshooting

2. Select the “MICOM UPGRADE” menu.

MAIN : SVC, MODE: COMP, RES : NOTSUPPORT

Test Pattern

DCc_Check_Local

0x0

Panel Auto Setting

PANEL DISPLAY TIME

T-CON USB
Download

T-CON CheckSum BT ADDRESS

CPLD USB Download Failure BT ADDRESS

REMOCON PAIRING X BT_AUDIO_ON_OFF OFF

TC905x7 FAN Step 7

MICOM UPGRADE off SVC Reset

MICOM POWER OFF OFF

Function UPGRADE off

Temp Last 60.00

Temp Read 0.00

DDC Version 0x0

DCC_CHK_SEL 0

3. Press the “►” button on the remocon and wait the completion of upgrade. The system will be reset after upgrade.

[WARNING] Don’t turn off the monitor until the upgrade is completed.

Failure DCC_Check_Total 0x0

12Hr IR_ON_OFF OFF

Failure BT_ON_OFF ON

e4e0c53574a2

MAIN : SVC, MODE: COMP, RES : NOTSUPPORT

MICOM UPGRADE Wait

4-22

5. Wiring Diagram

5-1. Wiring Diagram

5. Wiring Diagram

CN1601

F_TXO0N

1

2 F_TXO0P 46 DGND

3 F_TXO1N 47 B_TXECN

4 F_TXO1P 48 B_TXECP

5 F_TXO2N 49 DGND

6 F_TXO2P 50 B_TXE3N

7 DGND 51 B_TXE3P

8 F_TXOCN 52 DGND

9 F_TXOCP 53 ENABLE_3D_OUT

10 DGND 54 NC

11 F_TXO3N 55 NC

12 F_TXO3P 56 DGND

13 DGND 57 NC

14 F_TXE0N 58 DGND

15 F_TXE0P 59 NC

16 F_TXE1N 60 NC

17 F_TXE1P 61 NC

18 F_TXE2N 62 DGND

19 F_TXE2P 63 DGND

20 DGND 64 NC

21 F_TXECN 65 NC

22 F_TXECP 66 NC

23 DGND 67 PANEL_5V

24 F_TXE3N 68 PANEL_5V

25 F_TXE3P 69 PANEL_5V

26 DGND 70 PANEL_5V

27 B_TXO0N 71 PANEL_5V

28 B_TXO0P 72 PANEL_5V

29 B_TXO1N 73 DGND

30 B_TXO1P 74 DGND

31 B_TXO2N 75 LED1

32 B_TXO2P 76 LED2

33 DGND 77 LED3

34 B_TXOCN 78 VLED1

35 B_TXOCP 79 VLED2

36 DGND 80 LED4

37 B_TXO3N 81

38 B_TXO3P 82 LED6

39 DGND

40 B_TXE0N

41 B_TXE0P

42 B_TXE1N

43 B_TXE1P

44 B_TXE2N

45

B_TXE2P

LED5

N301

1 R+

2 R-

3 L+

4 L-

CN201

1 A14V_PW

2 DGND

3 DGND

4 DGND

CN303

1 SPDIF_OUT

2 B5V_PW

3 DGND

CN1701

1 TX+

2 DGND

3 TX-

4 RX+

5 DGND

6 RX-

7 NC

8 LAN_GND

TU701_HN

1 NC

2 A1.8V

3 GND

4 A3.3V

5 GND

6 SCL

7 SDA

8 NC

9 IF_AGC

10 DIF+

11 DIF-

12 RESET

13 SIF

14 NC

15 CVBS

CN302

1 DGND

2 HP_LINE_SL_OUT

3 HP_LINE_SR_OUT

4 IDENT_HP

5 DGND

6 HP_LINE_SL_OUT

CN402

1 DGND

2 PC_SL_IN

3 PC_SR_IN

4 NC

5 NC

6 NC

CN1401_RS

1 DGND

2 T1 OUT

3 R1 IN

4 R1 IN

5 R1 IN

6 T1 OUT

CN501

1 DGND

2 COMP1_Y

3 COMP1_PB

4 IDENT_COMP_AV1

5 COMP1_PR

6 DGND

7 IDENT_COMP1

8 COMP_AV1_SL_IN

9 COMP_AV1_SR_IN

5-1

5-2

5. Wiring Diagram

CN604

1 HDMI2_RX2+

2 MHL_AON

3 HDMI2_RX2-

4 HDMI2_RX1+

5 DGND

6 HDMI2_RX1-

7 HDMI2_RX0+

8 DGND

9 HDMI2_RX0-

10 HDMI2_RXCLK+

11 DGND

12 HDMI2_RXCLK-

13 HDMI_CEC

14 ARC2_SINGLE

15 HDMI2_DDC_SCL

16 HDMI2_DDC_SDA

17 DGND

18 HDMI2_5V

19 HDMI2_HPD

CN602

1 HDMI1_RX2+

2 DGND

3 HDMI1_RX2-

4 HDMI1_RX1+

5 DGND

6 HDMI1_RX1-

7 HDMI1_RX0+

8 DGND

9 HDMI1_RX0-

10 HDMI1_RXCLK+

11 DGND

12 HDMI1_RXCLK-

13 HDMI_CEC

14 DGND

15 HDMI1_DDC_SCL

16 HDMI1_DDC_SDA

17 HDMI1_IDENT

18 HDMI1_5V

19 HDMI1_HPD

CN1201_3D

1 IR

2 DGND

3 A3.3V_PW

4 MSCL_A5V

5 MSDA_A5V

6 WAKE

7 LED_STB

8 DGND

9 NC

10 NC

11 FRAME_SYNC_IN

12 EMITTER_3D_SYNC

13 DGND

14 USB_BT_D+

15 USB_BT_D-

16 DGND

17 WAKE

18 POWER_DET

CN1501

1 USB2_5V_VCC

2 USB2_DM

3 USB2_DP

4 DGND

CN1502

1 USB1_5V_VCC

2 USB1_DM

3 USB1_DP

4 DGND

5-3

5. Wiring Diagram

5-2. Board Connection

Main Board 

CN301

1

2

CN1201_3D

CN503_EU

(UK/Brasil

Option)

(US/Korea

Option)

CN1601

(Bottom side)

13

CN501

CN1801_CI

(Europ Only)

CN1502

12

CN201

3

4

CN303

No Connector

1 Speaker

2 Function & B/T Connector(Connect with function Assy)

3 Adaptor DC Power(+14V)

4 Digital Audio Output(Optical)

5 LAN

6 ATV/DTV Tuner

7 Service(Debug Connector)

8 DVI Audio IN

9 Headphone

5

CN1701

6

CN302

7 8

CN402

9 10

CN1401_RS

CN503_EU

11 11

CN604

CN602

12

CN1501

10 AV IN(Video/Audio) - Component Y, Pb, Pr

11 HDMI(DVI/ARC)

12 USB Port

13 LVDS Connector(Connect to Panel)

5. Wiring Diagram

5-3. Connector Functions

Connector Functions

CN1601 Transmits LVDS signals from the Main board to the panel

* When a problem occurs: The Blank Screen and No Power errors may occur.

CN604, CN602 HDMI&DVI signal input terminal

* When a problem occurs: The No HDMI&DVI Output error may occur.

CN201 Supplies 14V from the Power adapter to the Main board.

* When a problem occurs: The Blank Screen and No Power errors may occur.

CN501 Component video input & PC audio input terminal.

* When a problem occurs : The no MIC input and no speaker output error may occur.

CN303 Digital Audio output terminal.

* When a problem occurs: The No USB Download Operating error may occur.

CN401_RS Headphone output terminal.

5-4. Cables

Use LVDS 31P/51P FPC Cable(27”)

Code BN96-19129A

Photo

Use LVDS 31P/51P FPC Cable(23”)

Code BN96-19128A

Photo

Use Function & Bluetooth Cable

Code BN39-01514A

5-4

Photo