Hitachi CML171SXW Schematic

SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual.

No. 0414

CML171SXW

Data contained within this Service manual is subject to alteration for improvement.

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité» et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

Les données fournies dans le présent manuel d’entretien peuvent faire l’objet de modifications en vue de perfectionner le produit.

Die in diesem Wartungshandbuch enthaltenen Spezifikationen können sich zwecks Verbesserungen ändern.

Version Description Date

1.0 1. Original document 10.26.2001

1.1 2.Link file together 11.09.2001

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LCD Monitor

Oct 2001

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

5. General Connection and Applications … … … … … … … … … … … … … .. 9

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

6. Electronic Circuit Description … … … … … … … … … … … … … … … … .. 10

7. Electronic Block Diagram … … … … … … … … … … … … … … … … … … 11

8. Troubleshooting Flow Chart … … … … … … … … … … … … … … … … … .. 12

Appendix A. PCB Circuit Appendix B. PCB Layout Appendix C. PCB and Accessory Part List Appendix D. Mechanical Part List Appendix E. Pack and Other Part List Appendix F. Service Parts List Appendix G. Mechanical Disassembly

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

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.

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

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

60° / 60°(Typical) 40° /60°(Typical)

Luminance Contrast Ratio

Display Colors 16.7 million Power Input 100 ~ 240 VAC Full Range, 50/60 Hz (External AC adapter) Maximum power

consumption Signal Input

Video Signal Sync signals

Line (horizontal) frequency

Raster (vertical) frequency

Pixel dot clock 135 MHz (maximum) Recommended mode 1280 x 1024 @ 60 Hz Pedestal tilt

230 cd/m2 (Typical) 300 : 1 (Typical)

< 45W

RGB positive 0.7VPP, 75ohm Separate & Composite, TTL Level

31.5 kHz ~ 80 kHz

56 Hz ~ 75 Hz

20° forward, -5°backward

Dimensions (W x H x D)

Weight 7.0 kg Operating Conditions

Temperature Humidity

Altitude

Storage Conditions

Temperature Humidity Altitude

424 x 438 x 86 mm (without base)

5° ~ 40°C at altitude 0 ~ 2000m 5° ~ 30°C at altitude 2000 ~ 3000m

20% ~ 85% RH, non-condensing 3000m Max.

-20° ~ 60°C 5% ~ 95% RH 10000m Max.

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

2.2 – Analog Inputs

Mode

No.

1 VGA 60HZ

2 VGA 72HZ

3 VGA 75HZ

4 SVGA 56HZ

5 SVGA 60HZ

6 SVGA 72HZ

7 SVGA 75HZ

8 XGA 60HZ

9 XGA 70HZ

10 XGA 75HZ

11 SXGA 60HZ

12 SXGA 75HZ

13 MAC SVGA

14 MAC SVGA

15 US TEXT

16 VGA 70HZ

Mode Name

Resolution

640*480

800*600

1024*768

1280*1024

640*480

832*624

720*400

640*350

H.Freq.(KHZ)

V.Freq.(HZ)

31.469

59.941

37.804

72.81

37.5

75.0

35.156

56.25

37.879

60.317

48.077

72.188

46.875

75.0

48.363

60.004

56.476

70.069

60.023

75.029

63.981

60.020

79.976

75.025

35.0

66.667

49.725

74.550

31.469

70.087

31.469

70.087

H. Polarity V. Polarity

－－－－－－＋＋＋＋＋＋＋＋－－－－＋＋＋＋＋＋－－－－－＋＋－

Pixel CLK

(MHZ)

25.175

31.5

36.0

40.0

50.0

49.5

65.0

75.0

78.75

108

135

30.24

57.283

28.322

25.175

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

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

3. Control Buttons and Functions

There are four control buttons located at the lower part of the front panel of your display: ð POWER: Push to turn on or turn off the display. The power indicator (Green) will light while the display is on. ð Select: 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.

ð Up(△): 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”.

ð Down(▽): 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.

For detailed control functions, please refer to the 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.

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

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 .

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

4) Metallic Cover Removal:

Remove 6 screws 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 3 screws indicated as “K” from the inverter board, and then remove the board

carefully.

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

Hitachi CML171SXW LCD Monitor Service Manual (v1.1)

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

1 2 3 4 5 6 7 8

Red Video Green Video Blue Video Monitor Ground DDC-Return Red Ground Green Ground Blue Ground

9 10 11 12 13 14 15

+5V for DDC circuit Logic Ground Monitor Ground DDC-Serial Data H-Sync. V-Sync. DDC-Serial Clock

+ 21 hidden pages