Hitachi CML154XW 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
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
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.
SPECIFICATIONSAND PARTS ARE SUBJECTTO CHANGE FOR IMPROVEMENT
LCD Colour Monitor
November 2002
No. 0417
CML154XW

1
1.1. ELECTRICAL REQUIREMENTS................................................................................ 2
A. LCD Panel Specification............................................................................................................................ 2
B. CONTROLS .............................................................................................................................................. 3
C. Power Management .................................................................................................................................. 3
D. Display Modes FOR Inspections ............................................................................................................... 5
2.ADJUSTMENT CONDITIONS......................................................................................... 6
A. Measuring Apparatuses Used................................................................................................................... 6
B. Input Signal................................................................................................................................................ 6
C. Indication ................................................................................................................................................... 6
3.ADJUSTMENT OF POWER SUPPLY ...................................................................... 6
4.ADJUSTMENT OF BOARDS.......................................................................................... 7
A. Connection Method ................................................................................................................................... 7
5.DISPLAY CONTROL BOARD ........................................................................................ 9
A. Description................................................................................................................................................. 9
B. Features .................................................................................................................................................... 9
C. Block Diagram (Control CKT).................................................................................................................. 10
D. Connector Locations................................................................................................................................ 11
E. Connector Type....................................................................................................................................... 12
F. Connector pin assignment....................................................................................................................... 12
6.VK-546 CONTROL PANEL BOARD............................................................................. 16
A. Description............................................................................................................................................... 16
B. Connector and Switch Locations............................................................................................................. 16
C. Connector type ........................................................................................................................................ 16
D. Connector pin Assignment ...................................................................................................................... 17
7.POWER BOARD........................................................................................................... 19
A. Description............................................................................................................................................... 19
B. Electrical characteristics.......................................................................................................................... 19
C. Connector locations................................................................................................................................. 20
8.CIRCUIT DESCRPTION ............................................................................................... 21
A. Micro-Controller Circuit............................................................................................................................ 21
B. Circuit of Plug and Play ........................................................................................................................... 21
C. System Clock........................................................................................................................................... 21
D. Image Engine (Zoom).............................................................................................................................. 21
E. Power Regulator...................................................................................................................................... 21
9.INTRODUCTION........................................................................................................... 22
A. Front Panel Control and Led ................................................................................................................... 22
B. Rear Panel connector Input Signals......................................................................................................... 24
10. TROUBLESHOOTING............................................................................................. 25
A. Main Procedure ....................................................................................................................................... 25
APPENDIX A: SCHEMATIC DIAGRAMS..........................................................................30
APPENDIX B: DISPLAY UNIT ASSEMBLY......................................................................36
APPENDIX C: PART LISTS ..............................................................................................37

2
1. 1. ELECTRICAL REQUIREMENTS
A. LCD Panel Specification
Display: 15 inch (15” viewable image size): active matrix: thin film transistor
(TFT): liquid crystal display (LCD): 0.297 mm dot pitch: R.G.B.
Vertical stripe 200 cd//m2 white luminance, typical: 300:1 contrast
ratio, typical
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
Synchronization
Frequencies:
Horizontal: 24 kHz to 60 kHz
Vertical: 56 Hz to 75 Hz (1024 x 768 is up to 75 Hz)
Pixel Frequency: 21 Mhz to 78 Mhz
Resolution: Horizontal: 1024 dots
Vertical: 768 lines
Active Display Area: Horizontal: 304.1 mm
Vertical: 228.1 mm
Viewing Angles: AU
Up 40deg down 60deg (TYP)
Left 60deg, Right 60deg (TYP)
CR > 10
Hannstar
Up 45deg down 55deg (TYP)
Left 65deg, Right 65deg (TYP)
CR > 10
Display Colors: 6-bits driver
Power Supply: AC 100 to 240V worldwide input, 50 / 60Hz
Power
Consumption:
Typical: 25W on mode +10 / -25%
Environmental: Operating temperature: 0ºC to 50ºC
Storage temperature: -20ºC to 60ºC
Storage humidity: 10%~90%

3
B. CONTROLS
B-1 Control panel (monitor front panel)
1. Power LED, ( Please refer to C-2 LED definition table)
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)
C. Power Management
C-1 Power Management condition and status
State Signals Power Video LCD LED
Horizontal Vertical Video Supply Circuit
On Pulses Pulses Active On On On Green
Stand-by No Pulses Pulses Blanking Off Off Yellow
Suspend Pulses No Pulses
Off No pulses No pulses Blacking On Yellow
DC Power off Don’t care Don’t care Don’t care Off Off Off Off

4
C-2 LED definition Table
State LED
On mode Green
Stand-by Yellow
Suspend Yellow
Off mode Yellow
power off Dark
disconnection 1. Yellow(stand-by; suspend; off mode)
2. LED Dark (power off)
C-3 Power Consumption
Meet VESA DPMS Proposal
On mode 25 Wmax
Stand-by 5 Wmax
Suspend 5 Wmax
Off mode 5 Wmax
DC power off 5 Wmax
disconnection 5 Wmax
Measured from AC input, and not include audio at power-saving state
The stand-by, suspend and off mode recover to on mode about 3 seconds.

5
D. Display Modes FOR Inspections
D-1 Supported Timing(for Not supported timing will go to power saving mode)T
TIMING FH(KHZ)
FV(HZ)
SYNC
POLARITY
TOTAL
(DOT/LINE)
ACTIVE
(DOT/LINE)
SYNC
WIDTH
(DOT/LINE)
FRONT
PORCH
(DOT/LINE)
BACK
PORCH
(DOT/LINE)
PIXEL
FOREQ.
(MHZ)
31.469 [phone] 25.175
640x350
VGA-350 70.087 −449 350 2 37 60
24.83 −848 640 64 64 80 21.05
640x400
NEC PC9801 56.42 −440 400 8 7 25
31.469 −800 640 96 16 48 25.175
640x400
VGA-GRAPH 70.087 [phone]
31.5 −800 640 64 16 80 25.197
640x400
NEC PC9821 70.15 −449 400 2 13 34
31.469 −800 640 96 16 48 25.175
640x480
VGA-480 59.94 −525 480 2 10 33
37.861 −832 640 40 16 120 31.5
640x480
VESA-480-72Hz 72.809 −520 480 3 1 20
37.5 −840 640 64 16 120 31.5
640x480
VESA-480-75Hz 75 −500 480 3 1 16
31.469 −900 720 108 18 54 28.322
720x400
VGA-400-TEXT 70.087 [phone]
35.156 [phone] 36
800x600
SVGA 56.25 [phone]
37.879 [phone] 40
800x600
VESA-600-60Hz 60.317 [phone]
48.077 [phone] 50
800x600
VESA-600-72Hz 72.188 [phone]
46.875 [phone] 49.5
800x600
VESA-600-75Hz 75 [phone]
49.725 - 1152 832 64 32 224 57.2832
832x624
APPLE MAC-800 74.55 - 667 624 3 1 39
48.363 −1344 1024 136 24 160 65
1024x768
XGA 60.004 −806 768 6 3 29
53.964 [phone] 112 71.664
1024x768
COMPAQ-XGA 66.132 [phone]
56.476 −1328 1024 136 24 144 75
1024x768
VESA-768-70Hz 70.069 −806 768 6 3 29
60.023 [phone] 78.75
1024x768
VESA-768-75Hz 75.029 [phone]

6
2. ADJUSTMENT CONDITIONS
A. Measuring Apparatuses Used
Necessary measuring equipment that for the adjustment of LA-1221JMW’s MAIN PWB are
following items.
Adjusted Video Generator.
Oscilloscope (more than 4 channels required)
DC voltmeter
B. Input Signal
Input signal by using video signal generator with VGA Card port for this adjustment.
C. Indication
Input signal by using video signal generator with VGA Card port for this adjustment.
3. ADJUSTMENT of Power Supply
Input voltage AC 100 ~ 240Vac
Rated input voltage AC 90 ~ 264Vac
Frequency 50 / 60 Hz
Rated frequency 47 ~ 63 Hz
DC output
Out voltage +12V +5V
Maximum output current +1.5A +1.5A
Minimum output current 0A +0.1A
Range of voltage Regulation +15%~-5% ±5%

7
4. ADJUSTMENT OF BOARDS
Equipment is connected with boards to be inspected before adjustments. Refer to diagram
below.
A. Connection Method
A-1 VL547 For AU Panel and W/O Audio.
1. R.G.B Signal Cable
2. DC Power Cable
3. LCD Lamp Cables
4. Control Cable

8
A-2 VL542 For Hannstar Panel W/I Audio
1. R.G.B Signal Cable
2. DC Power Cable
3. LCD Lamp Cables
4. Control Cable
5. Audio Cable
6. Speaker and Wire / Connector

9
5. DISPLAY CONTROL BOARD
A. Description
The VL-547 and VL-542 display control board is design to directly convert the R.G.B signals
from VGA Card D-sub port to optimum LCD timing signals so as to construct a high display
quality LCD monitor.
B. Features
• On board sage chip to detect display timings and control user functions.
• Using sage chip to convert R.G.B signals to digital timing
• Using sage chip to offer full screen expansion function on non-XGA mode(Auto-Zoom).
• Support VESA DPMS function.
• Support DDC2B functions.

10
C. Block Diagram (Control CKT)
System Level Interface with Integrated Timing Controller
( VL-547 Diagram Hannstar Panel solution )
( VL-542 Diagram – AU Panel solution)

11
C-1 Sage Operation
The s9050-100 is highly-integrated display processors. It has an ADC/PLL block and a
microprocessor integrated on a single chip. The cost-effective s9050-100 is suitable for the
XGA and the s9050 for the SXGA market segment with smaller memory requirements. Other
features include a brand new high-end scaler, Active Color Management, a flexible OSD,
Autoadjust, SureSyncTM and independent monitoring of the analog interface. A new standalone
on-chip pattern generator has been incorporated to simplify the manufacture of monitors.
D. Connector Locations
( VL-547 Control Board for AU Panel solution )
( VL-542 Control Board for Hannstar Panel solution )

12
E. Connector Type
Location Type Maker Number of pins
CN1 DZ11A91-L8 P1.524 FEMALE 15
J2 96113-1003 E&T 10
J3 96113-0703 E&T 7
CN3 98210-4011 E&T 40
CN2 98210-4011 E&T 40
F. Connector pin assignment
F-1 CN1
Pin NO. Signal
1 Vertical Sync
2 Horizontal Sync
3 Blue Video Ground
4 Blue Video
5 Green Video Ground
6 Green Video
7 Red Video Ground
8 Red Video
9 Shield Ground
10 DDC-SCL
11 DDC-SDA
12 PC-DETECT
13 PC-5V

13
F-2
( VL-547 Control Board for AU Panel )

14
( VL-542 Control Board for Hannstar Panel )

15
F-3 J2
Pin NO. Signal Comment
1 NONE
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
F-4 J3
Pin NO. Signal Comment
1 +5V VL547 / VL-542 power input
2 +5V VL547 / VL-542 power input
3 GND Ground
4 GND Ground
5 BLON Back Light ON/OFF.
6 MUTE Audio amplifier control signal (Audio unction only )
7 BRIGHT Brightness Adjustment.

16
6. VK-546 Control Panel Board
A. Description
The VK-546 is designed to offer an user interfaced control panel which passes and
receives signals to and from power board .
B. Connector and Switch Locations
C. Connector type
Location Type Maker Number of pins
J1 96113-1113 E&T 11 (Audio Function Only)
J2 SCJ-0348-C SC 9 (Audio Function Only)
J3 87502-0200 ACES 2 (Audio Function Only)
J4 87502-0200 ACES 2 (Audio Function Only)
J5 96113-1013 E&T 10
VR1 F1001G-3 B50K FAVOR U 5 (Audio Function Only)

17
D. Connector pin Assignment
D-1 J1 (Audio Function Only)
Pin NO. Signal Comment
1 MUTE1 Audio Mute
2 GND GND
3 RIN1 Audio volume adjust line IN R
4 LIN1 Audio volume adjust line IN L
5 RIN2 Audio volume adjust line OUT R
6 LIN2 Audio volume adjust line OUT L
7 GND 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
D-2 J2 (Audio Function Only)
Pin NO. Signal
1 GND
2 RADOIN 2
3 LADOIN 2
4 RADOIN 1
5 RAUDIO
6 NC
7 LADOIN 1
8 LAUDIO
D-3 J3 & J4 (Audio Function Only)
Pin NO. Signal Comment
1 OUTL(OUTR) Speaker out
2 GND GND
D-4 J5
Pin NO. Signal Comment
1 NONE
2 LED-Y Power saving mode.
3 LED-G Monitor on mode.
4,10 GND Ground

18
5 KEY-UP Function select up
6 KEY-DOWN Function select down
7 KEY-R Function select right
8 KEY-L Function select left
9 KEY-PWR Power ON/OFF signal
D-5 VR1 (Audio Function Only)
Volume control , clockwise for increasing ; counter-clockwise for decreasing
D-6 Switch definition
Location Definition
S1 Function select by clockwise direction
S2 Adjust down
S3 Adjust up
S4 Function select by counter-clockwise direction
S5 Power ON/OFF
D-7 LED definition
Location Definition
D1 Green for ON mode; Yellow for DC power off; stand by;
suspend and off mode.

19
7. POWER BOARD
A. Description
There are three kind of circuits in this power board-AC/AC, inverter and audio
B. Electrical characteristics
B-1 FOR HANNSTAR PANEL
MIN. TYP. MAX. COMMENT
INPUT VOLTAGE 11.4V 12V 13.8V
INPUT CURRENT -------- 1A 1.2A Vin=12V MAX.
BRIGHTNESS
BACKLIGHT VOLTAGE 684Vrms 760V rms. --------
LAMP CURRENT 3mA rms. 6mA rms. 7mArms
DRIVING FREQUENCY 40KHz 55KHz 80KHz
EFFICIENCY -------- 75% -------- Vin = 12V
Operating Life Time 40,000 ------- -------- Hours (note)
Note:
Life time(Hr) can be defined as the time in which it continues to operate under the
condition:
Ta=25±3°C, IL=6.0mA
B-2 For AU panel
MIN. TYP. MAX. COMMENT
INPUT VOLTAGE 11.4V 12V 13.8V
INPUT CURRENT -------- 1A 1.2A Vin=12V MAX.
BRIGHTNESS
BACKLIGHT VOLTAGE 630V rms. 690Vrms
LAMP CURRENT 3mA rms. 6.5mA rms. 8mArms
DRIVING FREQUENCY 40KHz 55KHz 60KHz
EFFICIENCY -------- 75% -------- Vin = 12V
Operating Life Time 30,000 ------- -------- Hours (note)
Note:
Life time(Hr) can be defined as the time in which it continues to operate under the
condition:
Ta=25±3°C, IL=8.0mA