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

7
F-2CN5
Terminal No. Symbol Function
28,29,30 VDD 5V POWER SUPPLY
1TXE0-LVDS EVEN OUTPUT DATA PAIRS
2TXE0+ LVDS EVEN OUTPUT DATA PAIRS
3TXE1-LVDS EVEN OUTPUT DATA PAIRS
4TXE1+ LVDS EVEN OUTPUT DATA PAIRS
5TXE2-LVDS EVEN OUTPUT DATA PAIRS
6TXE2+ LVDS EVEN OUTPUT DATA PAIRS
8TXECLK-LVDS EVEN OUTPUT DATA PAIRS
9TXECLK+ 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-3CN1
Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment
1T.M.D.S. Data2-9T.M.D.S. Data1-17 T.M.D.S. Data0-
2T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+
3T.M.D.S. Data2/4 Shield 11 T.M.D.S. Data1/3 Shield 19 T.M.D.S. Data0/5 Shield
4T.M.D.S. Data4-12 T.M.D.S. Data3-20 T.M.D.S. Data5-
5T.M.D.S. Data4+ 13 T.M.D.S. Data3+ 21 T.M.D.S. Data5+
6DDC Clock 14 +5V Power 22 T.M.D.S. Clock Shield
7DDC Data 15 PC DETECT 23 T.M.D.S. Clock+
8Not Connect 16 Hot Plug Detect 24 T.M.D.S. Clock-
F-4CN8
Pin NO. Signal Comment
1,2,3 12 VCC Inverter Power Output.
4BLON Bright Light ON/OFF.
5,6,10,11,12 GND GND
7,8 5 VCC Inverter Power Output.
9BRIGHT Brightness Adjustment.

8
F-5CN4
Pin NO. Signal Comment
112 VCC 12 VCC Power Input
25 VCC 5V Power Input
3GND GND
4GND GND
F-6CN7
Pin NO. Signal Comment
1MUTE Volume ON/OFF control
2LED-YPower saving mode
3LED-GMonitor is ON
4GND GND
5KEY-UP Function select counter-clockwise key
6KEY-DOWN Function select counter-clockwise key
7KEY-RAdjust up key
8KEY-LAdjust down key
9KEY-POWER Power ON/OFF key
10 GND GND

9
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
30
1
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
1TXE0-LVDS EVEN OUTPUT DATA PAIRS 1
2TXE0+ LVDS EVEN OUTPUT DATA PAIRS 2
3TXE1-LVDS EVEN OUTPUT DATA PAIRS 3
4TXE1+ LVDS EVEN OUTPUT DATA PAIRS 4
5TXE2-LVDS EVEN OUTPUT DATA PAIRS 5
6TXE2+ LVDS EVEN OUTPUT DATA PAIRS 6
8TXECLK-LVDS EVEN OUTPUT DATA PAIRS 8
9TXECLK+ 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

10
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-CSC 9
J3 87502-0200 ACES 2
J4 87502-0200 ACES 2
J5 96113-1013 E&T 10
D. Connector pin Assignment
D-1J1
Pin NO. Signal Comment
1 VOL Volume ON/OFF control
2 GND GND
3 RIN1 Audio volume adjust line INR
4LIN1 Audio volume adjust line INL
5RIN2 Audio volume adjust line OUTR
6LIN2 Audio volume adjust line OUTL
7GND
8R-EAR EAR phone out R
9L-EAR EAR phone out L
10 ROUT Speaker out R
11 LOUT Speaker out L

11
D-2J5
Pin NO. Signal Comment
1MUTE Volume ON/OFF control
2LED-YPower saving mode.
3LED-GMonitor on mode.
4,10 GND
5KEY-UP Function select up to VL-706
6KEY-DOWN Function select down to VL-706
7KEY-RFunction select right to VL-706
8KEY-LFunction select left to VL-706
9KEY-PWR Power ON/OFF signal to VL-706
D-3J3 and J4
Pin NO. Signal Comment
1GND GND
2OUTL (OUTR) Speaker out
D-4J2
Pin NO. Signal I/O Comment
1GND Ground
2LI 2 Earphone out L
3RI 2 Earphone out R
4LI 1 Earphone out L
5LO Speaker out L
6NC No connector
7RI 1 Earphone out R
8RO Speaker out R

12
D-5Switch definition
Location Definition
S1 Power ON/OFF
S2 Function select by clockwise direction
S3 Function select by counter-clockwise direction
S4 Adjust up
S5 Adjust down
D-6LED definition
Location Definition
D1 Green for ON mode; Dark for DC power off; Yellow for stand by;
suspend;
off mode.
D-7Variable resistor
VR1:Volume control, clockwise for increasing;counter-clockwise for decreasing
D-8Electrical characteristics (Tamb=25°°)
Audio amplifier (Use Panasonic VP-7723A Audio Analyzor).
Item Audio Input Freq. Spec. Comment
Min. Typ. Max.
Input Voltage(V) 11.4 12 12.6
Input Current(mA) 500 800
Audio Voltage Gain 500mVrms 1KHz 14dB Volume Max.,load 8 Ω
Frequency
Response 100mVrms 50Hz~20KHz -3dB +3dB Volume Max.,load 8 Ω
Signaal to Noise
ratio 500mVrms 1KHz -70dB Volume Max.,load 8 Ω
Cross talk 100mVrms 1KHz -40dB Volume Max.,load 8 Ω
Distortion 500mVrms 1KHz 1% Volume Max.,load 8 Ω
Output Watt. 500mVrms 1KHz 0.5W Volume Max.,load 8 Ω
Volume Control Analog

13
5. VM-517 POWER and AUDIO
A. Major Specification
Input voltage: 12V±5% from adapter (LSE 9901B1260)
Inout current: 5A max.
Output:
ITEM Output Voltage Max Load. Min Load Tolerance Ripple & Noise(max)
VCC +5.1V 1.9A 0.19A ±5% 150mVpp
B.Description
The VM-517 is designed to supply the power to the VL-706 display control board.
Under the control of VL-706, it can run into power saving mode so that saving the
power of the whole monitor.
C.Efficiency:
80%min. at Maximum Load.
D. Connector Locations
E. Connector type
Location Type Maker Number of pins
J801 DC-IN SC 2
J3 SCJ-0345-1-X-SSC 3
J2 96113-1103 E&T 11
J802 B4B-XH-AJST 4

14
F. Connector pin Assignment
F-1J801 DC 12V Input
Pin No Signal Comment
Pin 1 +12V From adapter output cable
Pin 2 GND From adapter output cable
F-2J802 FOR I/F CKT
Pin No Signal Comment
Pin 1 +12V From adapter +12V power
Pin 2 +5.1V Supply for I/F CKT
Pin 3, 4 GND GND
F-3J3 FOR Audio input
Pin No Signal Comment
Pin 1 GND GND
Pin 2 Audio IN (1) From Audio output (1)
Pin 3 Audio IN (2) From Audio output (2)
F-4J2 TO Speaker CKT
Pin No Signal Comment
Pin 1 VOL Volume ON/OFF control
Pin 2 GND GND
Pin 3 RIN1 Audio volume adjust line INR
Pin 4 LIN1 Audio volume adjust line INL
Pin 5 RIN2 Audio volume adjust line OUTR
Pin 6 LIN2 Audio volume adjust line OUTL
Pin 7 GND
Pin 8 R-EAR EAR phone out R
Pin 9 L-EAR EAR phone out L
Pin 10 ROUT Speaker out R
Pin 11 LOUT Speaker out L

15
6. AC Adapter (LSL9901B12320)
A. Quick specification review
•Input voltage
Single phase, 50/60HZ, 100VAC to 240VAC ±10%
•Input current
1.5A (max), at 90VAC input and full load 0.75A (max), at 264 VAC input and
full load.
•Inrush current @ cold start
30A(0-peak)@ 110Vac ,50A(0-peak) @ 220Vac
•Output
Tolerance Output Current
Output Volt -MIN MAX Volt Tolerance
+12Vdc ±5% 0A 5A 11.4~12.6Vdc
•Total output power: 60 Watt max.
•Efficiency
80% min. @115V/230VAC, maximum load.
•Dimension: 110Lx63Wx31H
7. CIRCUIT DESCRPTION
A. Display-Controller
The U8 is image processor. The functions of the CHIP support as below:
1. Hight quality image scalar
2. On-Chip 16 bit Microprocessor
3. On screen display
4. Automatic image optimizer
B. Circuit of Plug and Play
Plug and play allows the serial communication of host PC and peripherals offering
minimal configurations to end users. This monitor supports DDC2B communication
protocal.
C. System Clock
The U11(130MHz)&U13(104 MHz) support U8 reference clock.
D. Power Regulator
1. The U15,U18(APL1085) & U17(APL5883) are linear regulator that transfer input
voltage from 5V to 3.3V.
2. The U16 (APL1117) is linear regulator that transfer input voltage from 5V to 2.5V.

16
8. INTRODUCTION
A. Front Panel Control and Led
Front Panel Controls
Item Control Function
1Power Switch Turns the monitor on and off.
2Power LED 1. Green indicates monitor is turns on.
2. Dark indicates DC power off.
3. Yellow indicates stand-
by, suspend, off
mode.
3
4Function
ButtonLaunches OSD function menu circully
5Plus Button Selects and adjusts the functions
6Minus Button Selects and adjusts the functions