Tatung L7CMS User manual

L7CMS/L7CMT

Tatung LCD Monitors

Service Manual

Ver 1.0

L7C SERIES LCD Monitor Service Manual (v1.0)

TABLE OF CONTENTS

1. Precaution and Notices … … … … .……………………………………… 3

1.1Safety Precaution … … … … .……………………………………….3

1.2 Product Safety Notice ……………………………………………… 3

1.3 Service Notes ……………………………………………………….3

2. Specifications … … … … .……………………………... … … … … … … … 4

2.1Monitor Specifications … ….. ……………………………………….4

2.2Timing Supported –Analog Inputs .. … … … … … … … … … … … … .5

3. Control Buttons and Functions ………………………………………….6

4. Disassembly Instructions ……………………………………………….. 6

5. General Connection and Applications ………………………………….. 6

5.1Connecting the Monitor to the Computer ………………………….. 9

6.Electronic Block Diagram …………………………………………..... 11

Appendix A. Troubleshooting Flow Chart

Appendix B. Mainboard Circuit Diagrams

Appendix C. Keyboard Circuit Diagrams

Appendix D. Audio Circuit Diagrams

Appendix E. Mechanical Disassembly

Appendix F. Service Parts List

L7C SERIES LCD Monitor Service Manual (v1.0)

1. Precautions and Notices

1.1 Safety Precautions

Although LCD monitors are displays without high voltage as that in the CRTs, the

following precautions still should be take care of.

1) Observe all cautions and safety related notes located inside the display cabinet and on

the display chassis.

2) Operation of these displays outside the cabinet or with the cover removed involves a

shock hazard from the display backlight’s inverter. Work on the display should not be

attempted by anyone who is not thoroughly familiar with precautions necessary when

working on high voltage equipment.

3) Before returning a serviced display to the customer, a thorough safety test must be

performed to verify that the display is safe to operate without danger or shock.

1.2 Product Safety Notice

1) Many electrical and mechanical parts in this chassis provide special visual safety

protection. The protection afforded by them cannot necessarily be obtained by using

replacement components rated for higher voltage, wattage, etc.

2) Before replacing any of these components, read the parts list manual carefully. The use

of substitute replacement parts, which do not have the same safety characteristics, as

specified in the parts list may create shock, fire or other hazards.

1.3 Service Notes

1) When replacing parts or circuit boards, wrap the wires around terminals before

soldering.

2) Keep wires away from high temperature components.

3) Keep cable and their shielding in their original position so as to reduce interference.

L7C SERIES LCD Monitor Service Manual (v1.0)

2. Specifications

2.1 Monitor Specification

LCD Module 17-in, active matrix TFT, anti-glare coating, 0.264 mm pixel pitch

Display Size 337.9 mm x 270.3 mm

Viewing Angle

Left/Right

Up/Down 80°/ 80°(Typical)

40°/80°(Typical)

Luminance

Contrast Ratio 250 cd/m2(Typical)

400 : 1 (Typical)

Display Colors 16.7 million

Power Input 100 ~ 240 VAC Full Range, 50/60 Hz (External AC adapter)

Maximum power

consumption < 45W

Signal Input

Video Signal

Sync signals RGB positive 0.7VPP, 75ohm

Separate & Composite, TTL Level

Line (horizontal)

frequency 31.5 kHz ~ 80 kHz

Raster (vertical)

frequency 56 Hz ~ 75 Hz

Pixel dot clock 135 MHz (maximum)

Recommended mode 1280 x 1024 @ 60 Hz

Pedestal tilt 20°forward, -5°backward

Dimensions

(W x H x D) 424 x 438 x 86 mm (without base)

Weight 7.0 kg

Operating Conditions

Temperature

Humidity

Altitude

5°~ 40°C at altitude 0 ~ 2000m

5°~ 30°C at altitude 2000 ~ 3000m

20% ~ 85% RH, non-condensing

3000m Max.

Storage Conditions

Temperature

Humidity

Altitude

-20°~ 60°C

5% ~ 95% RH

10000m Max.

L7C SERIES LCD Monitor Service Manual (v1.0)

2.2–Analog Inputs

Mode

No. Mode Name

Resolution H.Freq.(KHZ)

V.Freq.(HZ) H. Polarity

V. Polarity Pixel CLK

(MHZ)

1VGA 60HZ

640*480 31.469

59.941 －

－25.175

2VGA 72HZ

640*480 37.804

72.81 －

－31.5

3VGA 75HZ

640*480 37.5

75.0 －

－31.5

4SVGA 56HZ

800*600 35.156

56.25 ＋

＋36.0

5SVGA 60HZ

800*600 37.879

60.317 ＋

＋40.0

6SVGA 72HZ

800*600 48.077

72.188 ＋

＋50.0

7SVGA 75HZ

800*600 46.875

75.0 ＋

＋49.5

8XGA 60HZ

1024*768 48.363

60.004 －

－65.0

9XGA 70HZ

1024*768 56.476

70.069 －

－75.0

10 XGA 75HZ

1024*768 60.023

75.029 ＋

＋78.75

11 SXGA 60HZ

1280*1024 63.981

60.020 ＋

＋108

12 SXGA 75HZ

1280*1024 79.976

75.025 ＋

＋135

13 MAC SVGA

640*480 35.0

66.667 －

－30.24

14 MAC SVGA

832*624 493725

74.550 －

－57.283

15 US TEXT

720*400 31.469

70.087 －

＋28.322

16 VGA 70HZ

640*350 31.469

70.087 ＋

－25.175

Note: The display is capable of going beyond these recommended modes.

L7C SERIES LCD Monitor Service Manual (v1.0)

3. Control Buttons and Functions

There are four control buttons located at the lower part of the front panel of your display:

ðPOWER:Push to turn on or turn off the display. The power indicator (Green) will light

while the display is on.

ðSelect: Display the On-Screen Display (OSD) “Main Menu”, selects items for user

adjustment, and execute the function selected.

Note: Hold down this key for 2 seconds will clear OSD menu.

ðUp(

△

): Move upward through the choice in the OSD submenu. If an adjustment bar is

displayed, this button increases the setting value.

Note: This key is also used as‘direct key’to bring-up OSD “Audio Menu”.

ðDown(

▽

): Move downward through the choice in the OSD submenu. If an adjustment bar

is displayed, this button decreases the setting value.

Note: This key is also used as‘direct key’. When the OSD “Main Menu” is inactive, press

this key will execute‘Auto Setup’function.

Detail contral function please reference User’s Manual

4. Disassembly Instructions

To disassembly the monitor, follow the steps as below:

1)Face Down the Monitor.

Note: Face down the monitor on a smooth plane with a soft material on that plane to

protect the panel faceplate.

2)Hinge Cover Removal

As below, remove the screw indicated by “A”from the hinge cover, and then remove the

hinge cover (indicated by “B”) for the base.

L7C SERIES LCD Monitor Service Manual (v1.0)

3)Base and Back Cover Removal:

As below, after removing the hinge cover, there will be 4 screws (indicated by “C”), and

remove them. Then you can remove the whole base of the monitor.

Remove 4 screws indicated as “D”of the back cover. Then remove the back cover with

care .

L7C SERIES LCD Monitor Service Manual (v1.0)

4)Metallic Cover Removal:

Remove 6screws indicated as “G” from the back metallic cover. Then remove the back

metallic cover.

5)PCB Assembly Removal:

Caution: When serving or replacing the panel, disconnect the DC power jack completely.

(a)Unplug all connected wires from the PCB.

(b)Remove 3screws indicated as “K”from the inverter board, and then remove the board

carefully.

(c)Remove 2screws indicated as “J”from the audio board, and then remove the board

carefully.

(d)Remove 7 screws indicated as “I”from the main board connected with front cover.

L7C SERIES LCD Monitor Service Manual (v1.0)

5. General Connection and Applications

Procedures for installing and using this CML171SX LCD monitor are described as

below.

5.1 Connecting the monitor to the computer

1) Place the display on a flat, sturdy surface. Choose an area free from excessive heat,

moisture, and sunlight. Avoid possible sources of electromagnetic interference, such as

transformers, motors, and fluorescent lighting.

2) Locate the AC power adapter with attached power cable and then connect the power cable

to the power jack on the back of the display. Plug the three-prong power cord into a power

outlet, and plug the other end into the AC power adapter. The three-prong power cord is a

shielded type and is provided as a safety precautions to ensure proper electrical grounding.

Plug the D-SUB 15-pin analog signal cable into the Analog Input port on the back of the

display. Connect the other end of the signal cable into your computer’s VGA output port. The

assignment of the pins of the connector is as follows:

Pin Assignment of 15-pin D-SUB connector

1Red Video 9+5V for DDC circuit

2Green Video 10 Logic Ground

3Blue Video 11 Monitor Ground

4Monitor Ground 12 DDC-Serial Data

5DDC-Return 13 H-Sync.

6Red Ground 14 V-Sync.

7Green Ground 15 DDC-Serial Clock

8Blue Ground

L7C SERIES LCD Monitor Service Manual (v1.0)

3) First turn the PC power switch ON. Then apply power to the display by pressing the power

button to turn the monitor on. The power indicator LED will then illuminate.

Note: Do not force the cable into the connector; line it up carefully so that you don’t

bend the pins.

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