Hitachi CML181SXW Service manual

SERVICE MANUAL

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. 0413

CML181SXW

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

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.

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.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

TFT LCD DISPLAY PANEL

October 2001

1. ELECTRICAL REQUIREMENTS........................................................................5

A. LCD Panel Specification.......................................................................................................... 5

B. CONTROLS ............................................................................................................................ 6

C. Power Management................................................................................................................ 6

D. Display Modes FOR Inspections............................................................................................. 8

2. VL-706 DISPLAY CONTROL BOARD ...............................................................9

A. Description .............................................................................................................................. 9

B. Features .................................................................................................................................. 9

C. BLOCK DIAGRAM .................................................................................................................. 9

D. Connector Locations ............................................................................................................... 10

E. Connector Type....................................................................................................................... 10

F. Connector pin assignment....................................................................................................... 10

3. VC-702 LVDS SIGNAL TRANSFER BOARD.....................................................13

A. Description .............................................................................................................................. 13

B. Connector Locations ............................................................................................................... 13

C. Connector Type....................................................................................................................... 13

D. Connector pin assignment ...................................................................................................... 13

4. VK-517 CONTROL PANEL AND AUDIO BOARD .............................................14

A.Description ............................................................................................................................... 14

B.Connector and Switch Locations.............................................................................................. 14

C.Connector type......................................................................................................................... 14

D.Connector pin Assignment....................................................................................................... 14

5. VM-517 POWER AND AUDIO............................................................................17

A. Major Specification.................................................................................................................. 17

B. Description .............................................................................................................................. 17

C. Efficiency:................................................................................................................................ 17

D. Connector Locations ............................................................................................................... 17

E. Connector type........................................................................................................................ 17

F. Connector pin Assignment ...................................................................................................... 18

6. AC ADAPTER (LSL9901B12320) ......................................................................19

A. Quick specification review......................................................................................................... 19

7. CIRCUIT DESCRPTION.....................................................................................19

A. Display-Controller.................................................................................................................... 19

B. Circuit of Plug and Play........................................................................................................... 19

C. System Clock .......................................................................................................................... 19

D. Power Regulator ..................................................................................................................... 19

8. INTRODUCTION.................................................................................................20

A. Front Panel Control and Led ................................................................................................... 20

B. Rear Panel connector Input Signals........................................................................................ 21

9. TROUBLESHOOTING........................................................................................22

A. Main Procedure....................................................................................................................... 22

B. Power Circuit Troubleshooting ................................................................................................ 23

C. Backlights Troubleshooting..................................................................................................... 24

D. Performance Troubleshooting................................................................................................. 25

E. Function Troubleshooting........................................................................................................ 26

APPENDIX A: DISPLAY UNIT ASSEMBLY ..........................................................27

APPENDIX B: PCB ASSEMBLY ...........................................................................30

WARNING

1) Critical Components are marked with the symbol of # in the material list. For continued protection against Low Radiation, replace only with same part number.

This symbol warns the personnel that un-insulated voltage within the unit may have sufficient

magnitude to cause electric shock.

Therefore, it should be read carefully in order to avoid any problems.

1. ELECTRICAL REQUIREMENTS

18.1 inch (18.1” viewable image size): active matrix: thin film transistor (TFT): liquid crystal display (LCD): 0.2805 mm dot

white luminance,

interlaced: 60Hz to 75 Hz vertical refresh

Active Display

A. LCD Panel Specification

Display:

Compatibility:

Synchronization Frequencies:

Resolution:

pitch: R.G.B. Vertical stripe 200 cd//m typical: 200:1 contrast ratio, Min.

640 x 350: VGA-350 720 x 400: VGA text 640 x 400: VGA-GRAPH 640 x 480: VGA, 60Hz to 75 Hz vertical refresh rate 800 x 600: 56Hz to 75 Hz vertical refresh rate 1024 x 768 non-interlaced: 60Hz to 75 Hz vertical refresh rate 1280 x 1024 non-

rate Horizontal: 24 kHz to 80 kHz Vertical: 56 Hz to 75 Hz Pixel Frequency: 25 Mhz 135 Mhz Horizontal: 1280 dots Vertical: 1024 lines

Area: Viewing Angles:

Display Colors: Power Supply: Power

Consumption: Environmental:

Horizontal: 359.0 mm Vertical: 287.2 mm Up 80deg down 80deg (TYP) Left 80deg, Right 80deg (TYP) CR  10 16,777,216 (with FRC) AC 100 to 240V worldwide input, 50 / 60Hz Typical:50W on mode +10 / -25%

Operating temperature: 0ºC to 50ºC Storage temperature: -20ºC to 65ºC Relative Humidity: 20%~80%

B. CONTROLS

B-1 Control panel (monitor front panel)

1. Power LED

2. Adjust decrease.

3. Adjust increase.

4. Function select counter-clockwise.

5. Function select clockwise.

6. Power ON/OFF switch, push to ON and push to OFF. (toggle switch)

7. Ear phone jack.

8. Volume Control.

C. Power Management

C-1 Power Management

1. Meet VESA DPMS proposal

2. Power Consumption

Meet VESA DPMS Proposal

On mode 54 Wmax Green

Stand-by 5 Wmax Yellow Suspend 5 Wmax Yellow

Off mode 5 Wmax Yellow

DC power off 5 Wmax Dark

disconnection 5 Wmax

u Power saving states are measured with speakers attached but not worked. u The recovery time from stand by /suspend/off mode to on mode is 3 seconds

maximun.

Dark (DC power off) Yellow (DC power

on)

C-2 Power Consumption

Meet VESA DPMS Proposal

On mode 54 Wmax

Stand-by 5 Wmax Suspend 5 Wmax

Off mode 5 Wmax

DC power off 5 Wmax

disconnection 5 Wmax

1. Measured from AC input end of AC power adapter.

2. Power saving states are measured with speakers attached but not worked.

D. Display Modes FOR Inspections

D-1 Supported Timing

TIMING

FV(HZ) POLARITY (DOT/LINE) (DOT/LINE) WIDTH PORCH PORCH FOREQ.(MHZ) (DOT/LINE) (DOT/LINE) (DOT/LINE)

640x350 31.469 + 800 640 96 16 48 25.175 VGA-350 70.087 - 449 350 2 37 60 DEL

640x400 31.469 - 800 640 96 16 48 25.175 VGA-GRAPH 70.087 + 449 400 2 12 35 640x400 31.5 - 800 640 64 16 80 25.197 NEC PC9821 70.15 - 449 400 2 13 34 640x480 31.469 - 800 640 96 16 48 25.175 VGA-480 59.94 - 525 480 2 10 33 640x480 35 - 832 640 40 24 128 31.5 APPLE MAC480 640x480 37.861 - 832 640 40 16 120 31.5 VESA-48072Hz 640x480 37.5 - 840 640 64 16 120 31.5 VESA-48075Hz 720x400 31.469 - 900 720 108 18 54 28.322 VGA-400-TEXT 70.087 + 449 400 2 12 35 832x624 49.725 - 1152 832 64 32 224 57.2832 APPLE MAC800 800x600 35.156 + 1024 800 72 24 128 36 SVGA 56.25 + 625 600 2 1 22 800x600 37.879 + 1056 800 128 40 88 40 VESA-60060Hz 800x600 48.077 + 1040 800 120 56 64 50 VESA-60072Hz 800x600 46.875 + 1056 800 80 16 160 49.5

VESA-60075Hz 1024x768 48.363 - 1344 1024 136 24 160 65 XGA 60.004 - 806 768 6 3 29 1024x768 53.964 + 1328 1024 176 16 112 71.664 COMPAQ-XGA 66.132 + 816 768 4 8 36 1024x768 56.476 - 1328 1024 136 24 144 75 VESA-76870Hz 1024x768 60.023 + 1312 1024 96 16 176 78.75 VESA-76875Hz 1024x768 60.24 - 1328 1024 96 32 176 80 APPLE MAC768 1280x1024 64 + 1688 1280 112 48 248 108 VESA-102460Hz 1280x1024 80 + 1688 1280 144 16 248 135 VESA-102475Hz

If the input timing is not a supported timing listed above but within the supported frequency range (Horizontal:80KHz,Vertical:85Hz),this monitor will select a closest mode instead,But the display quality may not be optimized.

FH(KH

66.67 - 520 480 3 9 28

72.809 - 520 480 3 1 20

75 - 500 480 3 1 16

74.55 - 667 624 3 1 39

60.317 + 628 600 4 1 23

72.188 + 666 600 6 37 23

75 + 625 600 3 1 21

70.069 - 806 768 6 3 29

75.029 + 800 768 3 1 28

75.02 - 803 768 3 3 29

60 + 1066 1024 3 1 38

75 + 1066 1024 3 1 38

SYNC TOTAL ACTIVE SYNC FRONT BACK PIXEL

2. VL-706 DISPLAY CONTROL BOARD

A. Description

The VL-706 display control board is design to directly convert the analog RGB signals from standard VGA display card to optimum LCD timing signals so as to construct a high display quality LCD monitor.

B. Features

• On board embedded micro-processor to detect display timings and control

user functions.

• Using Pixelworks design to generate optimum LCD timings.

• Using E

PROM to memorize every adjusted parameter.

• support up to 22 display modes from VGA to SXGA.

• Offer full screen expansion function on non-SXGA mode (automatic).

• flexible color temperature selection function including 9300,6500 and user

mode.

• Support OSD functions.

• Support VESA DPMS function.

• Support DDC1/2B functions.

• Support 5 languages for OSD description.

• The longest time for mode change is 3 seconds.

C. BLOCK DIAGRAM

D. Connector Locations

E. Connector Type

Location Type Maker Number of pins

CN2 1211-15 E&T 15 CN1 74320-1004 FEMALE 30 CN8 96113-1203 E&T 12 CN3 96113-0513 E&T 5 CN7 96113-1003 E&T 10 CN4 96118-0413 E&T 4 CN5 98210-3011 E&T 30

F. Connector pin assignment

F-1 CN2

Pin NO. Signal Comment

1 R-Video Red Video Input. 2 G-Video Green Video Input. 3 B-Video Blue Video Input. 4 N. C. 5 PCDETECT PCDETECT Input. 6 Ground Ground. 7 Ground Ground. 8 Ground Ground 9 5VCC DDC Power Input. 10 Ground Ground. 11 NC 12 SDA DDC 1/2B 13 HS Horizontal Sync Input. 14 VS Vertical Sync Input.

15 SCL DDC 2B

F-2 CN5

Terminal No. Symbol Function

28,29,30 VDD 5V POWER SUPPLY

1 TXE0- LVDS EVEN OUTPUT DATA PAIRS 2 TXE0+ LVDS EVEN OUTPUT DATA PAIRS 3 TXE1- LVDS EVEN OUTPUT DATA PAIRS 4 TXE1+ LVDS EVEN OUTPUT DATA PAIRS 5 TXE2- LVDS EVEN OUTPUT DATA PAIRS 6 TXE2+ LVDS EVEN OUTPUT DATA PAIRS 8 TXECLK- LVDS EVEN OUTPUT DATA PAIRS

9 TXECLK+ LVDS EVEN OUTPUT DATA PAIRS 10 TXE3- LVDS EVEN OUTPUT DATA PAIRS 11 TXE3+ LVDS EVEN OUTPUT DATA PAIRS 12 TXO0- LVDS ODD OUTPUT DATA PAIRS 13 TXO0+ LVDS ODD OUTPUT DATA PAIRS 15 TXO1- LVDS ODD OUTPUT DATA PAIRS 16 TXO1+ LVDS ODD OUTPUT DATA PAIRS 18 TXO2- LVDS ODD OUTPUT DATA PAIRS 19 TXO2+ LVDS ODD OUTPUT DATA PAIRS 20 TXOCLK- LVDS ODD OUTPUT DATA PAIRS 21 TXOCLK+ LVDS ODD OUTPUT DATA PAIRS 22 TXO3- LVDS ODD OUTPUT DATA PAIRS 23 TXO3+ LVDS ODD OUTPUT DATA PAIRS

7,14,17,24 GND Ground

25,26,27 GND Ground

F-3 CN1

Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment

1 T.M.D.S. Data2- 9 T.M.D.S. Data1- 17 T.M.D.S. Data02 T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+ 3 T.M.D.S. Data2/4 Shield 11 T.M.D.S. Data1/3 Shield 19 T.M.D.S. Data0/5 Shield 4 T.M.D.S. Data4- 12 T.M.D.S. Data3- 20 T.M.D.S. Data55 T.M.D.S. Data4+ 13 T.M.D.S. Data3+ 21 T.M.D.S. Data5+ 6 DDC Clock 14 +5V Power 22 T.M.D.S. Clock Shield 7 DDC Data 15 PC DETECT 23 T.M.D.S. Clock+ 8 Not Connect 16 Hot Plug Detect 24 T.M.D.S. Clock-

F-4 CN8

Pin NO. Signal Comment

1,2,3 12 VCC Inverter Power Output. 4 BLON Bright Light ON/OFF. 5,6,10,11,12 GND GND 7,8 5 VCC Inverter Power Output. 9 BRIGHT Brightness Adjustment.

F-5 CN4

Pin NO. Signal Comment

1 12 VCC 12 VCC Power Input 2 5 VCC 5V Power Input 3 GND GND 4 GND GND

F-6 CN7

Pin NO. Signal Comment

1 MUTE Volume ON/OFF control 2 LED-Y Power saving mode 3 LED-G Monitor is ON 4 GND GND 5 KEY-UP Function select counter-clockwise key 6 KEY-DOWN Function select counter-clockwise key 7 KEY-R Adjust up key 8 KEY-L Adjust down key 9 KEY-POWER Power ON/OFF key 10 GND GND

3. VC-702 LVDS SIGNAL TRANSFER BOARD

A. Description

The VC-702 is the transfer PCB for LVDS signal transfer to LCD panel.

B. Connector Locations

1 30

CN1 CN2 LCM888 VC-702 REV: 1

C. Connector Type

Location Type Maker Number of pin Pitch CN1 98210-3011 E&T 30 0.5mm CN2 3800-30 E&T 30 1.25mm

D. Connector pin assignment

CN1Terminal No. Symbol Function CN2 Terminal No.

28,29,30 VDD 5V POWER SUPPLY 28,29,30

1 TXE0- LVDS EVEN OUTPUT DATA PAIRS 1 2 TXE0+ LVDS EVEN OUTPUT DATA PAIRS 2 3 TXE1- LVDS EVEN OUTPUT DATA PAIRS 3 4 TXE1+ LVDS EVEN OUTPUT DATA PAIRS 4 5 TXE2- LVDS EVEN OUTPUT DATA PAIRS 5 6 TXE2+ LVDS EVEN OUTPUT DATA PAIRS 6 8 TXECLK- LVDS EVEN OUTPUT DATA PAIRS 8

9 TXECLK+ LVDS EVEN OUTPUT DATA PAIRS 9 10 TXE3- LVDS EVEN OUTPUT DATA PAIRS 10 11 TXE3+ LVDS EVEN OUTPUT DATA PAIRS 11 12 TXO0- LVDS ODD OUTPUT DATA PAIRS 12 13 TXO0+ LVDS ODD OUTPUT DATA PAIRS 13 15 TXO1- LVDS ODD OUTPUT DATA PAIRS 15 16 TXO1+ LVDS ODD OUTPUT DATA PAIRS 16 18 TXO2- LVDS ODD OUTPUT DATA PAIRS 18 19 TXO2+ LVDS ODD OUTPUT DATA PAIRS 19 20 TXOCLK- LVDS ODD OUTPUT DATA PAIRS 20 21 TXOCLK+ LVDS ODD OUTPUT DATA PAIRS 21 22 TXO3- LVDS ODD OUTPUT DATA PAIRS 22 23 TXO3+ LVDS ODD OUTPUT DATA PAIRS 23

7,14,17,24 GND Ground 7,14,17,24

25,26,27 GND Ground 25,26,27

4. VK-517 Control Panel and Audio Board

A. Description

The VK-517 is designed to offer an user interfaced control panel which passes and receives signals to and from VL-706 display control board. Also there is a stereo audio amplifier to drive a pair of speakers .When in power saving mode the audio circuit can be turned off by the control signal from VL-706 board.

B. Connector and Switch Locations

C. Connector type

Location Type Maker Number of pins

J1 96113-1113 E&T 11 J2 SCJ-0348-C SC 9 J3 87502-0200 ACES 2 J4 87502-0200 ACES 2 J5 96113-1013 E&T 10

D. Connector pin Assignment

D-1 J1

Pin NO. Signal Comment 1 VOL Volume ON/OFF control 2 GND GND 3 RIN1 Audio volume adjust line INR 4 LIN1 Audio volume adjust line INL 5 RIN2 Audio volume adjust line OUTR 6 LIN2 Audio volume adjust line OUTL 7 GND 8 R-EAR EAR phone out R 9 L-EAR EAR phone out L 10 ROUT Speaker out R 11 LOUT Speaker out L

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