Hitachi CML190SXW, CML190SXWB Service manual

SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH

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. 0533

CML190SXW
CML190SXWB

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

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.

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.

1. Introduction ..................................................................................................................................2

2. Electrical Requirements ...............................................................................................................3

3. Vl-901 Display Control Board ...................................................................................................18

4. VK901 Control Panel Board ......................................................................................................23

5. Inverter Board.............................................................................................................................24

6. DC/DC Power and Audio Ckt Vm-902 .....................................................................................26

7. Troubleshooting..........................................................................................................................28

8. Mechanical Requirements ..........................................................................................................33

9. Power Line Transient Test (Iec 61000-4-4 Fast Transients/Burst) ............................................39

10. Power Line Surge Test (IEC 61000-4-5 Surge) .........................................................................42

11. Enviroment Requirement ...........................................................................................................43

12. Regulation Compliance..............................................................................................................44

13. Quality and Reliability ...............................................................................................................46

Appendix A: PCBA Assembly................................................................................................... 47

Appendix B: DISPLAY UNIT ASSEMBLY............................................................................. 55

Parts Lists.................................................................................................................................... 60

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

TFT LCD MONITOR

July 2002

1. INTRODUCTION

1.1 Scope

This specification defines the requirements for the 19” MICRO-PROCESSOR based Multi­mode supported high resolution color LCD monitor, This monitor can be directly connected
to general 15 pin D-sub VGA connector and DVI-D digital connector, eliminates the
requirement of optional special display card. It also supports VESA DPMS power
management and plug & play function. There is a build-in stereo audio amplifier with
volume control to drive a pair of speakers.

1.2 Description

The LCD monitor is designed with the latest LCD technology to provide a performance
oriented product with no radiation. This will alleviate the growing health concerns. It is also
a space saving design, allowing more desktop space, and comparing to the traditional CRT
monitor, it consumes less power and gets less weight in addition MTBF target is 20k
hours or more.

2

2. ELECTRICAL REQUIREMENTS

2.1 Standard Test Conditions

All tests shall be performed under the following conditions, unless otherwise specified.

Ambient light
Viewing distance
Warrn up time

: 225 lux

: 50 cm in front of LCD panel

All specifications: 30 minutes
Fully functional: 5 seconds
Measuring Equipment

: Chroma 2250 signal generator or equivalent, directly
Connected to the monitor under test.
Minolta CA100 photometer, or equivalent
Control settings
User brightness control: Maximum (unless otherwise specified )
User contrast control: Typical (unless otherwise specified )
User red/white balance,
Green/white balance and
Blue/white balance control: In the center (unless otherwise specified )
Power input
Ambient temperature
Analog input mode

: 110Vac or 230Vac

: 20 ± 5 ˚C ( 68 ± 9 ˚ F)

: 1280 x1024 /60 Hz

2.1.1 MEASUREMENT SYSTEMS

The units of measure stated in this document are listed below:
1 gamma = 1 nano tesla

1 tesla = 10,000 gauss
cm = in x 2.54

lb = kg x 2.2
degrees F = [°C x 1.8] + 32

degrees C = [°F - 32]/1.8
u' = 4x/(-2x + 12y + 3)

v' = 9y/(- 2x + 12y + 3)
x = (27u'/4)/[(9u'/2) - 12v ' + 9]

y = (3v')/[(9u' /2) - 12v' + 9]
nits = cd/(m2) = Ft-L x 3.426

lux = foot-candle x 10.76

2.2 LCD monitor General specification

Panel Type : 19 “ active matrix color TFT LCD

1). FUJITSU FLC48SXC8V

Display size : 376.32mm(H) x 301.056mm(V)
Display mode : VGA 720 X 400 (70 Hz)
VGA 640 X 480 (60/66/70/72/75 Hz)
SVGA 800 X 600 (60/70/72/75 Hz)

3

XGA 1024 X 768 (60/70/75 Hz)
SXGA 1280 X 1024 (60/70/75 Hz) standard resolution
Pixel pitch : 0.098x3mm(H) x 0.294mm(V)
Display Dot : 1280 x (RGB) x 1024
Pixel Clock : 25.2 – 135.0MHz

θ

Contrast ratio:
Brightness: 250 cd/m
Response time (Tr/Tf) : 15 /10 msec
Display color : 16777216 (8 bite color)
Viewing angle: L / R  85 /  85 (  170 degrees horizontal typical)
U / D  85 /  85 (  170 degrees vertical typical)
Luminance Uniformity : > 70 %
Pc interface: 1). Video : RGB analog 0.7V peak to peak

= 0˚ 500 : 1 (typical)

2

(typical)

Sync : TTL positive or negative

2). Digital TMDS
Signal connector : 15 pin Mini D type, (standard VGA video)
DVI-D connector

Front control : power on/off with LED select (up, down) adjustment (+,-)
Interface frequency

 Horizontal Frequency 24KHz --80KHz(analog), 31.5– 80KHz(digital)
 Vertical Frequency 56Hz ----75Hz

Plug & play : Support VESA DDC2B functions
Power Input voltage : Single phase, 50/60HZ, 100VAC to 240VAC ±10%
Total output power : 60 Watt max.

2.3 LCD Panel Specification

2.3.1 LCD Panel Model (FUJITSU FLC48SXC8V)

• Display Type active matrix color TFT LCD

• Resolution 1280 x 1024 pixels

• Display Dot 1280 x (RGB) x 1024

• Display Area 376.32mm(H) x 301.056mm(V)

• Pixel Pitch 0.098x3mm(H) x 0.294mm(V)

• Display Color 16777216

4

• Lamp Voltage 700 Vrms typ.

• Lamp Current 7mA rms.( typ). 4 Lamp

• Weight 3200g .

• Optical Specifications

The following items are measured under stable conditions. The optical characteristics

should be measured in a dark room or equivalent state with the methods shown in
Note(4).

Measuring equipment : TOPCON BM-5A, BM-7, PHOTO RESEARCH PR650

(Inverter Freq. : 54kHz) *Ta =25 ± 2°C, VDD=5V, fv=60 Hz, fDCLK=54 MHz, IL= 6.5mArms

Item Symbol Condition Min. Typ. Max. Unit Note

Contrast Ratio

(Center of screen)

Response

Time

Luminance of White

(Center of screen)

Color

Chromaticity

(CIE 1931)

Viewing

Angle

Brightness Uniformity

(9 points)

Rising TR - 15 30

Falling T

Red

Green

Blue

White

Hor.

Ver.

CR

F - 10 25

Y

L

Rx 0.648

Ry 0.346
Gx 0.292
Gy 0.602

Bx 0.150

By 0.130
Wx 0.313
Wy

θ

L

θ

R

φ

H

φ

L

B

UNI

Normal

φ
θ

Viewing

Angle

CR≥10

T.B.D 500 -

= 0˚
= 0˚

70 - -

200 250 -

TYP.

-0.03

0.329
85 - ­85 - ­85 - ­85 - -

TYP.

+0.03

msec

cd/m2

Degrees

%

(1)(2)(4)

BM-5A

(1)(3)
BM-7

(5)

BM-5A

(1)(4)

PR650

(1)(4)

BM-5A

(6)

BM-5A

Note 1) Definition of Viewing Angle: Viewing angle range (10≤CR)

5

Note 2) Definition of Contrast Ratio (CR): Ratio of gray max(Gmax),gray min(Gmin) at the

center point of panel.

Luminance with all pixels white (Gmax)

CR= 
Luminance with all pixels black (Gmin)

Note 3) Definition of Response time: Sum of T

, TF

R

6

Note 4) After stabilizing and leaving the panel alone at a given temperature for 30 min, the

measurement should be executed .Measurement should be executed n a stable,
windless ,and dark room.30 min after lighting the back-light. This should be
measured in the center of screen. Dual lamp current :13.0mA(6.5mA x2)(Refer to
the note(1) in the page 14 for more information ).

Environment condition :Ta=25±2°C

Optical characteristics measurement setup

7

Notes 5) Definition of Luminance of White : measure the luminance of white at center point.

Notes 6)Definition of 9 points brightness uniformity (Measuring points: Refer to the Note 5)

Bmin
B

=100∗∗∗∗ 

UNI

Bmax

Bmax: Maximum brightness

Bmin: Minimum brightness

Notes 7) Definition of Flicker level

Flicker Voltage

pp

F =  x 100 %
LMD Voltage

dc

♦♦♦♦ One maximum value of three estimated values.
♦♦♦♦ For this test ,an LMD(Light Measurement Device)is needed with adequate response time

to track any visible rate flicker component and with a voltage level output proportional
To luminance intensity.

♦♦♦♦ Test Pattern: For dot inversion Driving(Gray levels of foreground dots on the test panel

Are G22,G32,and G45)

♦♦♦♦ Test Point :Center point of the display area

8

Note 8) Definition of Crosstalk (Refer to the VESA STD)

The calculation for shadowing is made from the 2 luminance measurements Gbkg and Lsh,
as follows:

Lmax -Lmin
C

=  x100 %

T

Lmin

Where Lmax is the larger value of Gbkg or Lsh , and Lmin is the smaller of the two.

♦ To determine background and foreground levels (colors),first set the background to any

gray scale or color level suitable for shadowing determination.(Note that it may take
several iterations of adjusting background level and box levels to determine the proper
value for the background .Next display the box levels to determine the proper value for the
background level. Look for shadowing in any direction from box E. Independently vary the
gray level (or color) of the background and box E until the worst case shadowing is
observed. This defines the background (Gbkg) and foreground (Gfg) levels to be
maintained for the remainder of the test.

♦ One point only (the target) will be measured. To determine that point proceed as follows
Using the background and foreground gray levels of step1 (Gbkg and Gfg). Turn on each

box at a time. Look for the case with the worst shadowing. The box causing the worst case
is the shadowing source, or Bsrc. Use Bsrc and the box opposite from it that lies directly in
the shadow path. That is the target box, or Btgt. Note that box Eight be either Bsrc or Btgt,
depending on the shadowing conditions, but typically Bsrc and Btgt will be a pair of
opposite boxes, A&C or B&D. Btgt will only be displayed for aligning the LMD. It will be
turned off for the actual measurement.

♦♦♦♦ The target box point (Btgt) will be measured with the source box (Bsrc) turned on then off.

(Btgt is for alignment purpose only) Display the background only at level Gbkg. Display
Btgt determined in step 2 above. Using the correct distance, angle, and measurement
aperture, align the LMD to the center of the Btgt. Turn off Btgt. With Gbkg set to its proper
level, measure the luminance (or color). Next,turn on the source box Bsrc. Again measure at
the center point of Btgt (without Btgt present.). In this case the LMD will be measuring the
shadowing level, Lsh.

9

2.4 Input Signals

2.4.1 Video input

• Type Analog R, G, B., Digital TMDS

• Input Impedance 75 ohm +/- 2%

• Polarity Positive

• Amplitude 0 - 0.7 +/- 0.05 Vp

• Display Color same as LCD panel

2.4.2 Sync input

• Signal separate horizontal and vertical sync, or composite sync

which are TTL compatible

• Polarity positive and negative.

2.4.3 Interface frequency

The following frequency range is generalized by supported timing. If the entered
mode does not match the supported timing the display optimization will not be
assured.

• Horizontal Frequency 24KHz --80KHz(analog), 31.5– 80KHz(digital)

• Vertical Frequency 56Hz ---------75Hz

DISPLAY MODES

MONITOR

MODE NO.

1 640x350 31.5 + 70.0 - 25.0 VGA
2 640X400 24.83 - 56.4 - 21.05 NEC
3 640X400 31.5- 70.0+ 25.0 VGA
4 640X400 31.5- 70.1- 25.19 NEC
5 640X480 31.5 - 60.0 - 25.0 Defacto
6 640X480 35.0- 66.67- 30.24 MAC
7 640X480 37.86- 72.80- 31.5 VESA
8 640X480 37.5- 75.0- 31.5 VESA

9 720X400 31.5 - 70.0 + 28.0 Text Defacto
10 832X624 49.72- 74.55 - 57.28 MAC
11 800X600 35.16+ 56.25+ 36.0 SVGA
12 800X600 37.8 + 60.0 + 40.0 VESA
13 800X600 48.07 + 72.18 + 50.0 VESA
14 800X600 46.87+ 75.0+ 49.5 VESA
15 1024X768 48.4 - 60.0 - 65.0 VESA
16 1024X768 53.96 + 66.13 + 71.66 XGA
17 1024X768 56.47 - 70.07 - 75.0 VESA
18 1024X768 60.0 + 75.0 + 78.75 VESA
19 1024x768 60.24- 75.02- 80.0 MAC-768
20 1280X1024 64.0 + 60.0 + 108.5 SXGA
21 1280X1024 80.0 + 75.0 + 135.0 Defacto

SCREEN

RESOLUTION

HORIZONTAL

SYNC RATE

(kHz)

VERTICAL

SYNC RATE

(Hz)

VIDEO CLK

(MHz)

STANDARD

10

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
640x400 24.83 – 848 640 64 64 80 21.05
NEC PC9801 56.42 – 440 400 8 7 25
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 35.00 – 864 640 64 64 96 30.24
APPLE MAC­480
640x480 37.861 – 832 640 40 16 120 31.5
VESA-480-72Hz 72.809 – 520 480 3 1 20
640x480 37.5 – 840 640 64 16 120 31.5
VESA-480-75Hz 75 – 500 480 3 1 16
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-600-60Hz 60.317 + 628 600 4 1 23
800x600 48.077 + 1040 800 120 56 64 50
VESA-600-72Hz 72.188 + 666 600 6 37 23
800x600 46.875 + 1056 800 80 16 160 49.5
VESA-600-75Hz 75 + 625 600 3 1 21
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-768-70Hz 70.069 – 806 768 6 3 29
1024x768 60.023 + 1312 1024 96 16 176 78.75
VESA-768-75Hz 75.029 + 800 768 3 1 28
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: 75Hz), this monitor will select a closest mode instead. But
the display quality may not be optimized.
If the input timing over the supported frequency range, a message “Input Signal Out of Range”
will be shown.

FH(KHZ) SYNC TOTAL ACTIVE SYNC FRONT BACK PIXEL

66.67 – 525 480 3 3 39

74.55 – 667 624 3 1 39

75.02 – 803 768 3 3 29

60 + 1066 1024 3 1 38

75 + 1066 1024 3 1 38

11

2.4.4 85Hz refresh rate Support

Monitor should display 85Hz refresh rate mode as emergency mode.
Monitor should display “Out of Range” warning menu at this mode.

2.4.5 Video input Connector

Analog Video input Connector: 15pins mini D-Sub

Table 2.4.5. Pin assignment for D-sub connector

PIN NO. Separate Sync

1 RED VIDEO
2 GREEN VIDEO
3 BLUE VIDEO
4 GROUND
5 GROUND
6 RED GROUND
7 GREEN GROUND
8 BLUE GROUND
9 PC5V (+5V DDC)
10 CABLE DETECTION
11 GROUND
12 SDA
13 H.SYNC
14 V.SYNC
15 SCL

Color of plastic parts: Blue

5 1

10

15

D-sub connector

6

11

12

Digital Video input Connector: DVI-D (T.B.D)

Table 4-3-3. Pin assignment for DVI-D (24pin) connector

Pin – Assignment of DVI –D connector :

1 TX2- 9 TX1- 17 TX0­2 TX2+ 10 TX1+ 18 TX0+
3 Shield (TX2 / TX4) 11 Shield (TX1 / TX3) 19 Shield (TX0 / TX5)
4 NC 12 NC 20 NC
5 NC 13 NC 21 NC
6 DDC-Serial Clock 14 +5V power *) 22 Shield (TXC)
7 DDC-Serial Data 15 Ground (+5V) 23 TXC+
8 No Connect 16 Hot plug detect 24 TXC-

*) In case, the power of the PC unit is switched off and the power of the monitor is switched on,
no voltage may occur at pin 14.

13

2.5 CONTROLS

2 3 6 1 4 5

2.5.1 Control panel (monitor front panel)

1. Power LED, will be green when monitor is on; be amber when in power saving mode.

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)

Note: When OSD Menu is off, press button 2 and 3 at the same time can activate “Auto

Adjustment” immediately.

2.5.2 OSD Functions

• OSD Format: Refer to following figure.

• OSD Border: Cyan color

• OSD Tunable Item: The 16 icons that around the border.

• Selected Item: Yellow background

• Comment: Magenta foreground, Blue background

page format :

14

Description:

• Brightness: Brightness adjustment, the range from 0 to 100.

• Contrast: Contrast adjustment, the range from 0 to 100.

• H. Position: Horizontal position adjustment.

• V. Position: Vertical position adjustment.

• Phase: Focus adjustment, the range from 0 to 31,32 steps.

• OSD position: OSD position adjustment.

• Auto Adjustment: This feature will automatically adjust size, position, clock and phase.

It takes 3-5 seconds to finish. When auto start, it shows “Auto
Adjusting….” message.

• Clock: Frequency tracking adjustment. The max range from -48 to +48, but

some modes the range will be limited.

• Graph Text: 640x400(GRAPH) or 720x400(TEXT) mode select.

• Language: 5 kinds of language for description, including (English, German,

French, Spanish, Italian)

• Recall: Recall the default value.

• Color Temp: Color temperature for standard 9300,6500, 7500 or user defined.

 User:

User R: Red signal gain by user defined.
User G: Green signal gain by user defined.
User B: Blue signal gain by user defined.

 7500: Set CIE coordinate at 7500°K color temperature.
 6500: Set CIE coordinate at 6500°K color temperature.
 9300: Set CIE coordinate at 9300°K color temperature.

• Exit: Exit OSD menu function.

Sharpness : Adjust the scale-up effect(smoother or sharper.)
OSD Transparency: Adjust the transparency level of OSD. The range is from 0 to 100 scales.

Comment:

• 1280x1024: Current mode resolution.

• 60 HZ: Current mode vertical frequency±1Hz.

• VER 1.00: Firmware revision.

15

 Other features:

 Intellectual-Auto LCM999 can start the Auto-Adjustment automatically when input a new

display mode at first time. After the adjustment, LCM999 will remember this mode and
switch to optimized condition automatically for this mode whenever encounter this mode
again. Total 21 recent used modes are recorded into LCM999.

 VESA DPMS Functionality When signaled by the host CPU, LCM999 show a black

screen about 3 seconds. If no further signal, then it shows “No Signal” and enter power
saving mode.

2.6 White Color Temperature

White color temperature is 4 preset as 9300, 7500,6500 and User,
Default value of user color should be user which is maximum setting for panel.

Target of color setting

Color

Temp.

9300K 0.281 0.311 +0.03 0.189 0.446 u’v’ < 0.01*
7500K 0.300 0.315 +0.03 0.194 0.459 u’v’ < 0.01*
6500K 0.315 0.325 +0.03 0.198 0.468

User - - - - -

User should follow “Microsoft Windows Color Quality Specification for Liquid Crystal Display OEM’s”.
(http://www.microsoft.com/hwd ev/tech/color/ColorTest.asp)

Color Coordinate T olerance Color Coordinate Tolerance

x y u’ v’

*) TCO’0X A.2.6.1 requirement

u’v’ <

0.01*

16

2.7 POWER SUPPLY

2.7.1 input Voltage Range

The monitor shall operate within specification over the range of 90 to 265 VAC power supply.

2.7.2 Input Frequency Range

Input power frequency range shall be from 47.5 to 63 Hz over the specified input voltage range.

2.7.3 Quick specification review

• 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
(measured when switched off for at least 10 mins.)

• Output

Tolerance Output Current

Output Volt - MIN MAX

+12Vdc ±5% 0A 5A 11.4~12.6Vdc

Volt Tolerance

• Total output power: 60 Watt max.

• Withstanding voltage : 1.5Kvac or 2.2KVdc for 1 minute.

• Leakage current : < 0.25mA/100Vac , <3.5mA/230Vac

• Efficiency : 80% min. @115V/230VAC, maximum load.

2.7.4 Power Management

2.7.4.1 Meet VESA DPMS proposal

The monitor must comply with the Microsoft On Now specification, with a minimum of three power
management states, as defined by the VESA DPMS document. The front panel of the monitor must
appropriately display the DPMS state, For example:

DPMS ON : The power LED is Green
DPMS OFF : The power LED is Amber

2.7.5 Power Consumption

On mode 54 Wmax Green
Off mode 4 Wmax Amber

DC power off 4 Wmax Dark
disconnection 4 Wmax

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

Dark (DC power off)
Amber (DC power on)

2.7.6 Power Connector

All units shall have an IEC/CEE-22 type male power receptacle.

2.8 Plug & Play(EDID)

The monitor will be capable of sending a VESA standardized EDID file through the DDC (pins 12,
15 of the VGA connector).

17

3. VL-901 DISPLAY CONTROL BOARD

3.1 Description

The VL-901 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.

3.2 Features

•

On board embedded micro-processor to detect display timings and control user
functions.

• Using Genesis gm5120 design to generate optimum LCD timings.

• Using E

2

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 9300,6500,7500 and user

mode.

• Support OSD functions.

• Support VESA DPMS function.

• Support DDC2B functions.

• Support 5 languages for OSD description.

• The longest time for mode change is 3 seconds.

18

3.3 BLOCK DIAGRAM

19