Hitachi CML155XW Schematic

SERVICEMANUAL MANUELD'ENTRETIEN WARTUNGSHANDBUCH

CAUTION:

Beforeservicingthischassis,itisimportantthattheservicetechnicianreadthe“Safety Precautions”and“ProductSafetyNotices”inthisservicemanual.

No. 0411

CML155XW

DatacontainedwithinthisService manualissubjecttoalterationfor improvement.

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SPECIFICATIONSANDPARTSARESUBJECTTOCHANGEFORIMPROVEMENT

NOV 2001

ENGLISH

SAFETY PRECAUTIONS

WARNING: The following precautions must be observed.

ALL PRODUCTS

Before any service is performed on the chassis an isolation transformer should be inserted between the power line and the product.

1. When replacing the chassis in the cabinet, ensure all the protective devices are put back in place.

2. When service is required, observe the original lead dressing. Extra precaution should be taken to ensure correct lead dressing in any high voltage circuitry area.

3. Many electrical and mechanical parts in HITACHI products have special safety related characteristics. These characteristics are often not evident from visual inspection, nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified by marking with a

! on the schematics and the replacement parts list. The use of a substitute replacement component that does not have the same safety characteristics as the HITACHI recommended replacement one, shown in the parts list, may create electrical shock, fire, X-radiation, or other hazards.

4. Always replace original spacers and maintain lead lengths. Furthermore, where a short circuit has occurred, replace those components that indicate evidence of overheating.

5. Insulation resistance should not be less than 2M ohms at 500V DC between the main poles and any accessible metal parts.

6. No flashover or breakdown should occur during the dielectric strength test, applying 3kV AC or

4.25kV DC for two seconds between the main poles and accessible metal parts.

7. Before returning a serviced product to the customer, the service technician must thoroughly test the unit to be certain that it is completely safe to operate without danger of electrical shock. The service technician must make sure that no protective device built into the instrument by the manufacturer has become defective, or inadvertently damaged during servicing.

CE MARK

1. HITACHI products may contain the CE mark on the rating plate indicating that the product contains parts that have been specifically approved to provide electromagnetic compatibility to designated levels.

2. When replacing any part in this product, please use only the correct part itemised in the parts list to ensure this standard is maintained, and take care to replace lead dressing to its original state, as this can have a bearing on the electromagnetic radiation/immunity.

PICTURE TUBE

1. The line output stage can develop voltages in excess of 25kV; if the E.H.T. cap is required to be removed, discharge the anode to chassis via a high value resistor, prior to its removal from the picture tube.

2. High voltage should always be kept at the rated value of the chassis and no higher. Operating at higher voltages may cause a failure of the picture tube or high voltage supply, and also, under certain circumstances could produce X-radiation levels moderately in excess of design levels. The high voltage must not, under any circumstances, exceed 29kV on the chassis (except for projection Televisions).

3. The primary source of X-radiation in the product is the picture tube. The picture tube utilised for the above mentioned function in this chassis is specially constructed to limit X-radiation. For continued X-radiation protection, replace tube with the same type as the original HITACHI approved type

4. Keep the picture tube away from the body while handling. Do not install, remove, or handle the picture tube in any manner unless shatterproof goggles are worn. People not so equipped should be kept away while picture tubes are handled

LASERS

If the product contains a laser avoid direct exposure to the beam when the cover is open or when interlocks are defeated or have failed.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 2

TABLE OF CONTENTS

1. Precaution and Notices ………….… …………………………………… 4

1.1 Safety Precaution ………….………………………………………. 4

1.2 Product Safety Notice ……………………………………………… 4

1.3 Service Notes ………………………………………………………. 4

2. Specifications ………….……………………………...………………… 5

2.1 Monitor Specifications ……..………………………………………. 5

2.2 Stereo Speaker …..…… ……………………………………………. 6

2.3 Timing Supported – Analog Inputs ..………………………………. 7

2.4 Timing Supported – Digital Inputs ..…………….…………………. 7

3. Control Buttons and Functions …………………………………………. 8

3.1 User Control Buttons ..……..………………………………………. 8

3.2 Power LED ..……..…………………………………………………. 9

3.2 Tilting the Displays …………………………………………………. 9

4. Disassembly Instr uctions ……………………………………………….. 10

5. General Connection and Applications ………………………………….. 12

5.1 Connecting the Monitor to the Com puter ………………………….. 12

5.2 Connecting the Monitor to the AV device ………………………….. 14

6. Electronic Circuit Description ………………………………………….. 16

6.1 Main Board Circuit ……………………..………………………….. 16

6.2 Audio Board Circuit ………………………… ……………………… 18

6.3 Keyboard Circuit …………………………………………………… 18

6.4 Inverter Circuit …………………………..………………………….. 18

7 Troubleshooting Flow Chart …………………………………………….. 19

8. Repair Parts List …………………………………................……………. 19

9. Mechanical Disassembly ………………..………………………………. 19

10. PCB Layout ……………………………..…… …………………………. 19

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 3

Appendix A. Main Board Block Diagram Appendix B. Mainboard Circuit Diagrams Appendix C. Audio Board Circuit Diagram Appendix D. Keyboard Circuit Diagram

Appendix E. Inverter Circuit Diagram

Appendix F. Troubleshooting Flow Chart Appendix G. Proposed Repair Parts List Appendix H. Mechanical Disassembly Appendix I. PCB Layout

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 4

1. Precautions and Notices

1.1 Safety Precautions

Although LCD monitors are displays with lower voltage than 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 of 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 CML155XW LCD Monitor Service Manual (v1.0) 5

2. Specifications

2.1 Monitor Specification

Power Input

Voltage

AC 100V to 240 V, 50/60 Hz (External AC Adapter)

Power Consumption

Analog Input

Video Signals Input Impedance Sync Signals Connector Input Frequency

Resolution (Max.) Recommended mode

Digital Input

Input Signals Connector Input Frequency

LED color is green: < 40 W LED color is amber: < 5 W

RGB positive 0.7V p-p 75Ω=(Analog) Separate, Positive/Negative TTL voltage levels 15 pin Mini D type detachable cable fH : 31.47kHz ~ 60.02 kHz

fV : 56 Hz ~ 75 Hz 1024 x 768 / 75 Hz 1024 x 768 / 60 Hz

TMDS DVI-D type fH : 31.47kHz ~ 48.36 kHz

fV : 75 Hz Resolution (Max.) Recommended mode

Environment

Operating Conditions

Temperature

Relative Humidity Altitude

Storage Conditions

Temperature Relative Humidity Altitude

Monitor Tilt

Forward Backward

1024 x 768 / 60 Hz

5℃ to 40℃ (41℉ to 104℉) at altitude 0 ~ 2000m

5℃ to 30℃ (41℉ to 86℉) at altitude 2000 ~ 3000m

20% to 85% (non-condensing)

3000m max.

-20℃ to +60℃ (-4℉ to 140℉)

5% to 95%

10,000m max

-5º

+20º

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 6

Panel Characteristics

Panel Ty pe Pixel Format Pixel Pitch Pixel Configuration Display Area Faceplate Coating Luminance Contrast Ration White Point Display Color Viewing Angle

15-in (38.1 cm) XGA TFT LCD (active matrix)

1024(H) x 768(V) (1 pixel = R+G+B dot)

0.297 mm(H) x 0.297 mm(V)

R、G、B vertical stripe

304.1 mm(H) x 228.1 mm(V)

Anti-glare, and hard-coating 3H (Haze value = 28)

300 Cd/m² (typ.)

500:1 (typ.)

(x, y) = (0.29, 0.31)

16,777,216

H: -65º ~ 65º (typ.)

V: -60º ~ 50º (typ.)

Panel Characteristics Power Managem ent Dimension Weight

2.2 Stereo Speakers

DDC2B

Complies with EPA and DPMS

376 mm x 381 mm x 204 mm (W x H x D)

5.5 kg

Stereo Speaker

1) Impedance: 8 ohms

2) Input power: 1.2 Watts RMS (maximum) X 2

3) Input jack: stereo 1/8-inch mini-jack input

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 7

2.3 Timing Supported – Analog Inputs

Mode Resolution fH (kHz) fV (Hz) Pixel Clock (MHz) H pol. V pol..

1 640 x 350 31.47 70.09 25.18 + -

2 640 x 480 31.47 59.94 25.18

3 640 x 480 37.80 72.81 31.50

4 640 x 480 37.50 75.00 31.50 5 800 x 600 35.16 56.25 36.00 + + 6 800 x 600 37.88 60.32 40.00 + + 7 800 x 600 48.08 72.19 50.00 + + 8 800 x 600 46.88 75.00 49.50 + +

9 1024 x 768 48.36 60.00 65.00

10 1024 x 768 56.48 70.07 75.00

11 1024 x 768 60.02 75.03 78.75 + + 12 720 x 400 31.47 70.08 28.32 - +

13 640 x 480 35.00 66.67 30.24

14 832 x 624 49.73 74.55 57.28

2.4 Timing Supported – Digital Inputs

Mode Resolution fH (kHz) fV (Hz) Pixel Clock (MHz) H pol. V pol..

1 640 x 480 31.469 59.940 25.175

2 640 x 480 37.50 75.00 31.50 3 800 x 600 37.88 60.3 40.00 + + 4 800 x 600 46.88 75.00 49.50 + +

5 1024 x 768 48.363 60.004 65.000

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 8

3. Control Buttons and Functions

3.1 User Control Buttons

There is a power button located at the lower center of the front panel, as well as an LED

for power status indication as shown below.

Power Button

Also there are three control buttons, i.e., “Select”, “Left” and the “Right” on the front

panel of the display as shown below.

LED

Left Button

Select Button

Right Button

And the associated functions of these keys are described as follows:

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 9

Key Function Description

POWER

Select

Right

Left

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

Display the main On-Screen Display (OSD) window and select options in the windows.

Move forward through the choice in the OSD windows. If a adjustment bar is displayed, this button increases the setting.

Move backward through the choice in the OSD windows. If an adjustment bar is displayed, this button decreases the setting.

3.2 Power LED

The color of the power LED depends on the power status of the monitor. When the LED

color is continuously green, it indicates the monitor is at normal operation state. When the LED is in amber, it indicates the monitor is at a power saving state.

3.3 Tilting the Display

CML155XW has a tilt feature that allows you to tilt the display back and forth or swivel the display left and right to find the most comfortable viewing position. To tilt the display, grasp the sides and push the display back or pull it toward you until it is in the desired position. The display can be tilted 20º backward and 5º forward or swiveled 60º left and right.

Grasp here

to tilt

Note: Do not tilt the display by grasping the top edge.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 10

4. Disassembly Instructions

To disassembly the monitor, follow the steps as below:

1) Face Down the Monitor.

Note:

Place the monitor face down on a smooth surface covered by soft material to protect the panel faceplate.

2) Back Cover Removal:

In Fig. 4-1, remove 4 screws indicated as “A” from the four corner of the back cover. Then remove the back cover.

Fig. 4-1

3) Metallic Cover Removal:

In Fig. 4-2, remove 7 screws indicated as “B” from the back metallic cover. Then remove the back metallic cover.

Fig. 4-2

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 11

4) 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 “C” from the inverter board, and then remove the board

carefully. (left side in Fig. 4-3)

carefully.

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

4-3)

Fig. 4-3

5) Panel Removal:

(a) Remove 6 screws indicated as “F” from the front cover (Fig. 4-3) to remove the panel.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 12

5. General Connection and Applications

Procedures for installing and using this CML155XW LCD monitor are described as

below.

5.1 Connecting the monitor to a 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.

Analog video

Power jack

3) Plug the D-SUB 15-pin analog video signal cable (or 20-pin DFP cable) into the Analog

(or Digital) Video Input port on the back of the display. Connect the other end of the video cable into your computer’s video port. The assignment of the pins of the connector is as follows:

input port

Digital video input port

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 13

Pin A s signment of 15-pin D-SUB connector

1 2 3 4 5 6 7 8

9 10 11 12

Red V ideo Green V ideo Blue V ideo 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

Pin Assignment of 24-pin DVI-D co nnector

T.M.D.S. Data2T.M.D.S. Data2+ T.M.D.S. Data2/4 Shield T.M.D.S. Data4T.M.D.S. Data4+ DDC Clock DDC Data No Connect T.M.D.S. Data1T.M.D.S. Data1+ T.M.D.S. Data1/3 Shield T.M.D.S. Data3-

T.M.D.S. Data3+ +5V Power Ground (for +5V) Hot Plug Detect T.M.D.S. Data0T.M.D.S. Data0+ T.M.D.S. Data0/5 Shield T.M.D.S. Data5T.M.D.S. Data5+ T.M.D.S. Clock Shield T.M.D.S. Clock+ T.M.D.S. Clock-

4) Connect the audio cable to the speaker input jack on the back of the display (the jack is

colored green to match the cable plug and the writed audio 1):

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 14

Audio 1 jack

5) 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.

5.2 Connecting the monitor to an AV device

1) Plug the 4-pin s-video signal cable (or CVBS cable) into the S-video (or CVBS) Video

Input port on the back of the display. Connect the other end of the video cable into your AV’s video port. The assignment of the pins of the connector is as follows:

Power jack

CVBS video input port

S-video video input port

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