Hitachi CML181SXW User 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.
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.
SERVICE MANUAL
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.
October 2001
TFT LCD DISPLAY PANEL
No. 0413
SPECIFICATIONSAND PARTS ARE SUBJECTTO CHANGE FOR IMPROVEMENT
CML181SXW

1. ELECTRICALREQUIREMENTS........................................................................5
A. LCD Panel Specification.......................................................................................................... 5
B. CONTROLS ............................................................................................................................ 6
C. PowerManagement................................................................................................................ 6
D. Display Modes FOR Inspections............................................................................................. 8
2. VL-706 DISPLAYCONTROL 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 SIGNALTRANSFER BOARD.....................................................13
A. Description .............................................................................................................................. 13
B. Connector Locations ............................................................................................................... 13
C. Connector Type....................................................................................................................... 13
D. Connector pin assignment...................................................................................................... 13
4. VK-517 CONTROL PANEL ANDAUDIO BOARD.............................................14
A.Description ............................................................................................................................... 14
B.Connector and Switch Locations.............................................................................................. 14
C.Connector type......................................................................................................................... 14
D.Connector pin Assignment....................................................................................................... 14
5. VM-517 POWER ANDAUDIO............................................................................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. ACADAPTER (LSL9901B12320)......................................................................19

A. Quickspecification review......................................................................................................... 19
7. CIRCUIT DESCRPTION.....................................................................................19
A. Display-Controller.................................................................................................................... 19
B. Circuit of Plug and Play........................................................................................................... 19
C. System Clock.......................................................................................................................... 19
D. PowerRegulator ..................................................................................................................... 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:DISPLAYUNIT 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.
2) 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
1. ELECTRICAL REQUIREMENTS
A. LCD Panel Specification
Display:
18.1 inch (18.1” viewable image size): active matrix: thin film
transistor (TFT): liquid crystal display (LCD): 0.2805 mm dot
pitch: R.G.B. Vertical stripe 200 cd//m2
white luminance,
typical: 200:1 contrast ratio, Min.
Compatibility: 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-
interlaced: 60Hz to 75 Hz vertical refresh
rate
Synchronization
Frequencies: Horizontal: 24 kHz to 80 kHz
Vertical: 56 Hz to 75 Hz
Pixel Frequency: 25 Mhz 135 Mhz
Resolution: Horizontal: 1280 dots
Vertical: 1024 lines
Active Display
Area: Horizontal: 359.0 mm
Vertical: 287.2 mm
Viewing Angles: Up 80deg down 80deg (TYP)
Left 80deg, Right 80deg (TYP)
CR  10
Display Colors: 16,777,216 (with FRC)
Power Supply: AC 100 to 240V worldwide input, 50 / 60Hz
Power
Consumption: Typical:50W on mode +10 / -25%
Environmental: Operating temperature: 0ºC to 50ºC
Storage temperature: -20ºC to 65ºC
Relative Humidity: 20%~80%

2
B.CONTROLS
B-1Control 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-1Power 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 Dark (DC power off) Yellow (DC power
on)
uPower saving states are measured with speakers attached but not worked.
uThe recovery time from stand by /suspend/off mode to on mode is 3 seconds
maximun.

3
C-2Power 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.

4
D.Display Modes FOR Inspections
D-1Supported Timing
TIMING FH(KH Z)
SYNC TOTAL ACTIVE SYNC FRONT BACK PIXEL
FV(HZ) POLARITY (DOT/LINE) (DOT/LINE) WIDTH PORCH PORCH FOREQ.(MHZ)
(DOT/LINE) (DOT/LINE) (DOT/LINE)
640x350 31.469 [phone] 25.175
VGA-350 70.087 -449 350 237 60
DEL
640x400 31.469 -800 640 96 16 48 25.175
VGA-GRAPH 70.087 [phone]
640x400 31.5 -800 640 64 16 80 25.197
NEC PC9821 70.15 -449 400 213 34
640x480 31.469 -800 640 96 16 48 25.175
VGA-480 59.94 -525 480 210 33
640x480 35 -832 640 40 24 128 31.5
APPLE MAC-
480 66.67 -520 480 3928
640x480 37.861 -832 640 40 16 120 31.5
VESA-480-
72Hz 72.809 -520 480 3120
640x480 37.5 -840 640 64 16 120 31.5
VESA-480-
75Hz 75 -500 480 3116
720x400 31.469 -900 720 108 18 54 28.322
VGA-400-TEXT 70.087 [phone]
832x624 49.725 -1152 832 64 32 224 57.2832
APPLE MAC-
800 74.55 -667 624 3139
800x600 35.156 [phone] 36
SVGA 56.25 [phone]
800x600 37.879 [phone] 40
VESA-600-
60Hz 60.317 [phone]
800x600 48.077 [phone] 50
VESA-600-
72Hz 72.188 [phone]
800x600 46.875 [phone] 49.5
VESA-600-
75Hz 75 [phone]
1024x768 48.363 -1344 1024 136 24 160 65
XGA 60.004 -806 768 6329
1024x768 53.964 [phone] 112 71.664
COMPAQ-XGA 66.132 [phone]
1024x768 56.476 -1328 1024 136 24 144 75
VESA-768-
70Hz 70.069 -806 768 6329
1024x768 60.023 [phone] 78.75
VESA-768-
75Hz 75.029+800 768 3128
1024x768 60.24 -1328 1024 96 32 176 80
APPLE MAC-
768 75.02 -803 768 3329
1280x1024 64 [phone] 248 108
VESA-1024-
60Hz 60 [phone]
1280x1024 80 [phone] 248 135
VESA-1024-
75Hz 75 [phone]
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.

5
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 E2PROM 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

6
D. Connector Locations
E. Connector Type
Location Type MakerNumber 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-1CN2
Pin NO. Signal Comment
1R-Video Red Video Input.
2G-Video Green Video Input.
3B-Video Blue Video Input.
4N. C.
5PCDETECT PCDETECT Input.
6Ground Ground.
7Ground Ground.
8Ground Ground
95VCC 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