Hitachi CML200UXWB 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.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LCD MONITOR
July 2002
No. 0534
CML200UXWB

2
TABLE OF CONTENTS
1. Precaution and Notices ………….……………………………………… 3
1.1 Safety Precaution ………….………………………………………. 3
1.2 Product Safety Notice ……………………………………………… 3
1.3 Service Notes ………………………………………………………. 3
2. Specifications ………….……………………………...………………… 4
2.1 Monitor Specifications ……..………………………………………. 5
2.2 Timing Supported – Analog Inputs ..………………………………. 5
2.2 Timing Supported – Digital Inputs ..……………………………….. 6
3. Adjusting Your Display ...........…………………………………………. 7
4. Disassembly Instructions ……………………………………………….. 8
5. General Connection and Applications ………………………………….. 11
5.1 Connecting the Monitor to the Computer ………………………….. 11
6. Electronic Circuit Description ………………………………………….. 13
7. Electronic Block Diagram ………………………………………………. 14
8. Troubleshooting Flow Chart……………………………………………. 15
Appendix A. PCB Circuit
Appendix B. PCB Layout
AppendixC. PartsLists
Appendix D. Mechanical Disassembly

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1. Precautions and Notices
1.1 Safety Precautions
Although LCD monitors are displays without high voltage as that 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 or 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.

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2. Specifications
2.1 Monitor Specification
LCD Module 20.1-in, active matrix TFT, anti-glare coating, 0.255 mm pixel pitch
Display Size 408 mm x 306 mm
Viewing Angle
Left/Right
Up/Down 85°/ 85°(Typical)
85°/85°(Typical)
Luminance
Contrast Ratio 250 cd/m2(Typical) 500 : 1 (Typical)
Display Colors 16.7 million
Power Input 100 ~ 240 VAC Full Range, 50/60 Hz (External AC adapter)
Maximum power
consumption < 70W
Signal Input
Video Signal
Sync signals Analog:RGB positive 0.7VPP, 75ohm
Separate & Composite, TTL Level
Digital:TMDS 0.3Vp-p differential
Line (horizontal)
frequency Analog:31.5 kHz ~ 80 kHz / Digital :31.5kHz ~ 75kHz
Raster (vertical)
frequency Analog:56 Hz ~ 75 Hz / Digital :60Hz~75Hz
Pixel dot clock 162 MHz (maximum)
Recommended mode 1600 x 1200 @ 60 Hz
Pedestal tilt 15°forward, -5°backward
Pedestal swivel 45°right ,45°left
Dimensions
(W x H x D) 494 x 448 x 224 mm (without speaker)
Weight 11 kg
Operating Conditions
Temperature
Humidity
Altitude
5°~ 40°C at altitude 0 ~ 2000m
5°~ 30°C at altitude 2000 ~ 3000m
20% ~ 85% RH, non-condensing
3000m Max.
Storage Conditions
Temperature
Humidity -20°~ 60°C
5% ~ 85% RH

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Altitude 10000m Max.
2.2 Analog Inputs
Mode
No. Mode Name Resolution H.Freq.(KHZ) V.Freq.(HZ) H. Polarity V. Polarity Pixel CLK (MHZ)
1 VGA 60HZ
640*480 31.469 59.941 －
－
25.175
2 VGA 72HZ
640*480 37.804 72.81 －
－
31.5
3 VGA 75HZ
640*480 37.5 75.0 －
－
31.5
4 SVGA 56HZ
800*600 35.156 56.25 ＋
＋
36.0
5 SVGA 60HZ
800*600 37.879 60.317 ＋
＋
40.0
6 SVGA 72HZ
800*600 48.077 72.188 ＋
＋
50.0
7 SVGA 75HZ
800*600 46.875 75.0 ＋
＋
49.5
8 XGA 60HZ
1024*768 48.363 60.004 －
－
65.0
9 XGA 70HZ
1024*768 56.476 70.069 －
－
75.0
10 XGA 75HZ
1024*768 60.023 75.029 ＋
＋
78.75
11 SXGA 60HZ
1280*1024 63.981 60.020 ＋
＋
108
12 SXGA 75HZ
1280*1024 79.976 75.025 ＋
＋
135
13 UXGA 60Hz
1600 * 1200 75.0 60 ＋
＋
162
14 MAC SVGA
640*480 35.0 66.667 －
－
30.24
15 MAC SVGA
832*624 493725 74.550 －
－
57.283
16 US TEXT
720*400 31.469 70.087 －
＋
28.322

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2.3 Digital Input:
Mode
No. Mode Name Resolution H.Freq.(KHZ) V.Freq.(HZ) H. Polarity V. Polarity Pixel CLK (MHZ)
1 VGA 60HZ
640*480 31.469 59.941 －
－
25.175
2 VGA 75HZ
640*480 37.5 75.0 －
－
31.5
3 SVGA 60HZ
800*600 37.879 60.317 ＋
＋
40.0
4 SVGA 75HZ
800*600 46.875 75.0 ＋
＋
49.5
5 XGA 60HZ
1024*768 48.363 60.004 －
－
65.0
6 SXGA 60HZ
1280*1024 63.981 60.020 ＋
＋
108
7 US TEXT
720*400 31.469 70.087 －
＋
28.322
8 UXGA 60Hz
1600 * 1200 75.0 60 ＋
＋
162
Note:
The display is capable of going beyond these recommended modes.

ENGLISH
3. Adjusting Your Display
This chapter contains information about how to changing display settings for your LCD
Monitor. It is designed with an OSD menu to help you easily adjust to its optimum
performance.
Note: You must perform auto setup before making any adjustment.
Summary of Control Buttons
There are three control buttons located at the lower part of the front panel of your display:
Select: Display the On-Screen Display (OSD) “Main Menu” and selects items for user
adjustment.
Note: Hold down this key for 2 seconds will clear OSD menu.
Right( ): Move upward through the choice in the OSD submenu. If an adjustment
bar is displayed, this button increases the setting value.
Note: This key is also used as ‘direct key’ to bring-up OSD “Audio/Video”.
Left( ): Move downward through the choice in the OSD submenu. If an adjustment
bar is displayed, this button decreases the setting value.
Note: This key is also used as ‘direct key’. When the OSD “Main Menu” is inactive,
press this key will bring-up ‘Auto Setup’ submenu.
Displaying the OSD “Main Menu”
You can use the OSD features to change the screen settings of your display. To display
the OSD “Main Menu”, please press the ‘Select’ button.
Brightness
 100

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4. Disassembly Instructions
To disassembly the monitor, follow the steps as below:
1) Face Down the Monitor.
Note:
Face the monitor down ona smooth plane with a soft material onthatplane to
protect the panel faceplate.
2) Hinge Cover and base Removal
As below, remove the hinge cover and the 4 screw “B” then remove the base “C”.

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3) Back Cover Removal:
As below, after removing the base, there will be 7 screws (indicated by “D”), and remove
them. Then you can remove the back covere “E” of the monitor.
4) Metallic Cover Removal:
Remove 12 screws indicated as “F” from the back metallic cover. Then remove the back
metallic cover “G”.

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5) 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 4 screws indicated as “H” from the audio board, and then remove the board
carefully.
(c) Remove 6 screws indicated as “I” from the main board, and then remove the board
carefully.

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6) Speaker Removal:
As below, remove the 6 screw “A” then remove the back cover “D”.
Remove the 4 screen “B” to remove the trumpet and 2 screen “C” to remove the
speaker audio in connector.

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5. General Connection and Applications
Procedures for installing and using this CML171SX LCD monitor are described as
below.
5.1 Connecting the monitor to the 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.
Plug the D-SUB 15-pin analog signal cable into the Analog Input port or DVD-D 25 pin
signal cable into the Digital Input pory on the back of the display. Connect the other end of
the signal cable into your computer’s VGA output port. The assignment of the pins of the
connector is as follows:

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Pin Assignment of 15-pin D-SUB connector
1Red Video 9+5V for DDC circuit
2Green Video 10 Logic Ground
3Blue Video 11 Monitor Ground
4Monitor Ground 12 DDC-Serial Data
5DDC-Return 13 H-Sync.
6Red Ground 14 V-Sync.
7Green Ground 15 DDC-Serial Clock
8Blue Ground
Pin Assignment of 25-pin DVI-D connector
1RX2- 14 +5V
2RX2+ 15 GND
3GND 16 DETECT
4RX4- 17 RX0-
5RX4+ 18 RX0+
6DVI_DDDCSCL 19 GND
7DVI_DDDCSDA 20 RX5-
8DVI_AVSYNC 21 RX5+
9RX1- 22 GND
10 RX1+ 23 RXC-
11 GND 24 RXC+
12 RX3- 25 GND
13 RX3+
3) First turn the PC power switch ON. Then applypower to the displayby pressing the powerbutton to turn the monitor on. The power indicator LED will then illuminate.
Note:
Do not forcethe cable into the connector; line it up carefully so that you don’tbend the pins.
6. Electronic Circuit Description
6.1 PCB Board Circuit
The circuit diagrams of main board (PWB-0432) ;power&audio board (PWB-0433);
Inverter(panel include); key board(PWB-0409) are shown in Appendix A.

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7. Electronic Block Diagram
gm5060
gm5060gm5060
gm5060
PLL
ADC
TMDS
DIGITAL VIDEO
OSD
SCALER
292PIN PBGA Package
XTAL SDRAM
ADAPTER
19V DC Power Supply
Analog R.G.B
Digital DVI
EDID
EPROM
EDID
EPROM
MCU
EEPROM
Keypad
Audio Input Audio
Sorround Audio Amplifier Speaker/Earphone
Inverter
T
F
T
L
C
D
P
A
N
E
L
XTAL
+12V
+5V
+3.3V
+2.5V

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8. Troubleshooting Flow Chart
No image
appear
LED light up
Voltage of
P310(PWB-0433) at pin
3,4 are 5V and pin 7,8
are 12V
Replace PWB-0433
Voltage of
P010(PWB-0432) at pin
28,29,30 are 12V
The frequence of X001
and X003 is 24MHz
Replace MCU
I005
Replace X001
Replace X003
Replace PWB-0433
LED display is
amber
Is it entering power
saving mode
LED Display is
green
Replace inverter
Replace MCU
I005
Replace
PWB-0432
END END
END
END
END
END
END
YES
YES
YES
NO NO
NO
NO
YES
YES
YES
Restasr PC signal to
ensure H.V Sync. are not
absent
NO
NO
YES
NO
Is LVDS cable
atttached firmly at the
LCD panel connector
and PWB-0432
Tighten LVDS cable
at LCD panel
connector and
PWB-0432
END
YES
NO

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No sound
output
(PWB-0433)
Are the
waveforms at
pin 15(L_IN) and
pin 2(R_IN) of I301
normal
Check audio source
Are the
waveforms
at pin 1(L_OUT) and
pin 7(R_OUT) of
P306 normal
Yes
No
Are two speakers
working correctly
Replace PWB-0433No
Yes
Replace speakersNo
END
Yes
END
END
END

Appendix A. PCB Circuit