Hitachi CML155XW Schematic

SERVICEMANUAL
MANUELD'ENTRETIEN
WARTUNGSHANDBUCH

CAUTION:

Beforeservicingthischassis,itisimportantthattheservicetechnicianreadthe“Safety
Precautions”and“ProductSafetyNotices”inthisservicemanual.

No. 0411

CML155XW

DatacontainedwithinthisService
manualissubjecttoalterationfor
improvement.

ATTENTION:

Avantd’effectuerl’entretienduchâassis,letechniciendoitlireles«Précautionsdesécurité»
etles«Noticesdesécuritéduproduit»présentésdansleprésentmanuel.

VORSICHT:

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zurProduktsicherheit“indiesemWartungshandbuchzulesen.

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manueld’entretienpeuventfairel’objet
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leproduit.

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SPECIFICATIONSANDPARTSARESUBJECTTOCHANGEFORIMPROVEMENT

NOV 2001

ENGLISH

SAFETY PRECAUTIONS

WARNING: The following precautions must be observed.

ALL PRODUCTS

Before any service is performed on the chassis an
isolation transformer should be inserted between the
power line and the product.

1. When replacing the chassis in the cabinet, ensure
all the protective devices are put back in place.

2. When service is required, observe the original
lead dressing. Extra precaution should be taken to
ensure correct lead dressing in any high voltage
circuitry area.

3. Many electrical and mechanical parts in
HITACHI products have special safety related
characteristics. These characteristics are often not
evident from visual inspection, nor can the
protection afforded by them necessarily be
obtained by using replacement components rated
for higher voltage, wattage, etc. Replacement
parts which have these special safety
characteristics are identified by marking with a

! on the schematics and the replacement parts
list.
The use of a substitute replacement component
that does not have the same safety characteristics
as the HITACHI recommended replacement one,
shown in the parts list, may create electrical
shock, fire, X-radiation, or other hazards.

4. Always replace original spacers and maintain lead
lengths. Furthermore, where a short circuit has
occurred, replace those components that indicate
evidence of overheating.

5. Insulation resistance should not be less than 2M
ohms at 500V DC between the main poles and
any accessible metal parts.

6. No flashover or breakdown should occur during
the dielectric strength test, applying 3kV AC or

4.25kV DC for two seconds between the main
poles and accessible metal parts.

7. Before returning a serviced product to the
customer, the service technician must thoroughly
test the unit to be certain that it is completely safe
to operate without danger of electrical shock. The
service technician must make sure that no
protective device built into the instrument by the
manufacturer has become defective, or
inadvertently damaged during servicing.

CE MARK

1. HITACHI products may contain the CE mark on
the rating plate indicating that the product
contains parts that have been specifically
approved to provide electromagnetic
compatibility to designated levels.

2. When replacing any part in this product, please
use only the correct part itemised in the parts list
to ensure this standard is maintained, and take
care to replace lead dressing to its original state,
as this can have a bearing on the electromagnetic
radiation/immunity.

PICTURE TUBE

1. The line output stage can develop voltages in
excess of 25kV; if the E.H.T. cap is required to be
removed, discharge the anode to chassis via a
high value resistor, prior to its removal from the
picture tube.

2. High voltage should always be kept at the rated
value of the chassis and no higher. Operating at
higher voltages may cause a failure of the picture
tube or high voltage supply, and also, under
certain circumstances could produce X-radiation
levels moderately in excess of design levels. The
high voltage must not, under any circumstances,
exceed 29kV on the chassis (except for projection
Televisions).

3. The primary source of X-radiation in the product
is the picture tube. The picture tube utilised for
the above mentioned function in this chassis is
specially constructed to limit X-radiation. For
continued X-radiation protection, replace tube
with the same type as the original HITACHI
approved type

4. Keep the picture tube away from the body while
handling. Do not install, remove, or handle the
picture tube in any manner unless shatterproof
goggles are worn. People not so equipped should
be kept away while picture tubes are handled

LASERS

If the product contains a laser avoid direct exposure to
the beam when the cover is open or when interlocks are
defeated or have failed.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 2

TABLE OF CONTENTS

1. Precaution and Notices ………….… …………………………………… 4

1.1 Safety Precaution ………….………………………………………. 4

1.2 Product Safety Notice ……………………………………………… 4

1.3 Service Notes ………………………………………………………. 4

2. Specifications ………….……………………………...………………… 5

2.1 Monitor Specifications ……..………………………………………. 5

2.2 Stereo Speaker …..…… ……………………………………………. 6

2.3 Timing Supported – Analog Inputs ..………………………………. 7

2.4 Timing Supported – Digital Inputs ..…………….…………………. 7

3. Control Buttons and Functions …………………………………………. 8

3.1 User Control Buttons ..……..………………………………………. 8

3.2 Power LED ..……..…………………………………………………. 9

3.2 Tilting the Displays …………………………………………………. 9

4. Disassembly Instr uctions ……………………………………………….. 10

5. General Connection and Applications ………………………………….. 12

5.1 Connecting the Monitor to the Com puter ………………………….. 12

5.2 Connecting the Monitor to the AV device ………………………….. 14

6. Electronic Circuit Description ………………………………………….. 16

6.1 Main Board Circuit ……………………..………………………….. 16

6.2 Audio Board Circuit ………………………… ……………………… 18

6.3 Keyboard Circuit …………………………………………………… 18

6.4 Inverter Circuit …………………………..………………………….. 18

7 Troubleshooting Flow Chart …………………………………………….. 19

8. Repair Parts List …………………………………................……………. 19

9. Mechanical Disassembly ………………..………………………………. 19

10. PCB Layout ……………………………..…… …………………………. 19

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 3

Appendix A. Main Board Block Diagram
Appendix B. Mainboard Circuit Diagrams
Appendix C. Audio Board Circuit Diagram
Appendix D. Keyboard Circuit Diagram

Appendix E. Inverter Circuit Diagram

Appendix F. Troubleshooting Flow Chart
Appendix G. Proposed Repair Parts List
Appendix H. Mechanical Disassembly
Appendix I. PCB Layout

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 4

1. Precautions and Notices

1.1 Safety Precautions

Although LCD monitors are displays with lower voltage than 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 of 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.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 5

2. Specifications

2.1 Monitor Specification

Power Input

Voltage

AC 100V to 240 V, 50/60 Hz (External AC Adapter)

Power Consumption

Analog Input

Video Signals
Input Impedance
Sync Signals
Connector
Input Frequency

Resolution (Max.)
Recommended mode

Digital Input

Input Signals
Connector
Input Frequency

LED color is green: < 40 W
LED color is amber: < 5 W

RGB positive 0.7V p-p
75Ω=(Analog)
Separate, Positive/Negative TTL voltage levels
15 pin Mini D type detachable cable
fH : 31.47kHz ~ 60.02 kHz

fV : 56 Hz ~ 75 Hz
1024 x 768 / 75 Hz
1024 x 768 / 60 Hz

TMDS
DVI-D type
fH : 31.47kHz ~ 48.36 kHz

fV : 75 Hz
Resolution (Max.)
Recommended mode

Environment

Operating Conditions

Temperature

Relative Humidity
Altitude

Storage Conditions

Temperature
Relative Humidity
Altitude

Monitor Tilt

Forward
Backward

1024 x 768 / 60 Hz

1024 x 768 / 60 Hz

5℃ to 40℃ (41℉ to 104℉) at altitude 0 ~ 2000m

5℃ to 30℃ (41℉ to 86℉) at altitude 2000 ~ 3000m

20% to 85% (non-condensing)

3000m max.

-20℃ to +60℃ (-4℉ to 140℉)

5% to 95%

10,000m max

-5º

+20º

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 6

Panel Characteristics

Panel Ty pe
Pixel Format
Pixel Pitch
Pixel Configuration
Display Area
Faceplate Coating
Luminance
Contrast Ration
White Point
Display Color
Viewing Angle

15-in (38.1 cm) XGA TFT LCD (active matrix)

1024(H) x 768(V) (1 pixel = R+G+B dot)

0.297 mm(H) x 0.297 mm(V)

R、G、B vertical stripe

304.1 mm(H) x 228.1 mm(V)

Anti-glare, and hard-coating 3H (Haze value = 28)

300 Cd/m² (typ.)

500:1 (typ.)

(x, y) = (0.29, 0.31)

16,777,216

H: -65º ~ 65º (typ.)

V: -60º ~ 50º (typ.)

Panel Characteristics
Power Managem ent
Dimension
Weight

2.2 Stereo Speakers

DDC2B

Complies with EPA and DPMS

376 mm x 381 mm x 204 mm (W x H x D)

5.5 kg

Stereo
Speaker

1) Impedance: 8 ohms

2) Input power: 1.2 Watts RMS (maximum) X 2

3) Input jack: stereo 1/8-inch mini-jack input

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 7

2.3 Timing Supported – Analog Inputs

Mode Resolution fH (kHz) fV (Hz) Pixel Clock (MHz) H pol. V pol..

1 640 x 350 31.47 70.09 25.18 + -

2 640 x 480 31.47 59.94 25.18

3 640 x 480 37.80 72.81 31.50

4 640 x 480 37.50 75.00 31.50
5 800 x 600 35.16 56.25 36.00 + +
6 800 x 600 37.88 60.32 40.00 + +
7 800 x 600 48.08 72.19 50.00 + +
8 800 x 600 46.88 75.00 49.50 + +

9 1024 x 768 48.36 60.00 65.00

10 1024 x 768 56.48 70.07 75.00

11 1024 x 768 60.02 75.03 78.75 + +
12 720 x 400 31.47 70.08 28.32 - +

-

-

-

-

-

-

-

-

-

-

13 640 x 480 35.00 66.67 30.24

14 832 x 624 49.73 74.55 57.28

--

--

2.4 Timing Supported – Digital Inputs

Mode Resolution fH (kHz) fV (Hz) Pixel Clock (MHz) H pol. V pol..

1 640 x 480 31.469 59.940 25.175

2 640 x 480 37.50 75.00 31.50
3 800 x 600 37.88 60.3 40.00 + +
4 800 x 600 46.88 75.00 49.50 + +

5 1024 x 768 48.363 60.004 65.000

-

-

-

-

-

-

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 8

3. Control Buttons and Functions

3.1 User Control Buttons

There is a power button located at the lower center of the front panel, as well as an LED

for power status indication as shown below.

Power Button

Also there are three control buttons, i.e., “Select”, “Left” and the “Right” on the front

panel of the display as shown below.

LED

Left Button

Select Button

Right Button

And the associated functions of these keys are described as follows:

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 9

n

Key Function Description

POWER

Select

Right

Left

Push to turn on or turn off the display. The power indicator
(Green) will light while the display is on.

Display the main On-Screen Display (OSD) window and
select options in the windows.

Move forward through the choice in the OSD windows. If a
adjustment bar is displayed, this button increases the setting.

Move backward through the choice in the OSD windows. If
an adjustment bar is displayed, this button decreases the
setting.

3.2 Power LED

The color of the power LED depends on the power status of the monitor. When the LED

color is continuously green, it indicates the monitor is at normal operation state. When the
LED is in amber, it indicates the monitor is at a power saving state.

3.3 Tilting the Display

CML155XW has a tilt feature that allows you to tilt the display back and forth or swivel
the display left and right to find the most comfortable viewing position. To tilt the display,
grasp the sides and push the display back or pull it toward you until it is in the desired
position. The display can be tilted 20º backward and 5º forward or swiveled 60º left and
right.

Grasp here

to tilt

Note: Do not tilt the display by grasping the top edge.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 10

4. Disassembly Instructions

To disassembly the monitor, follow the steps as below:

1) Face Down the Monitor.

Note:

Place the monitor face down on a smooth surface covered by soft material to
protect the panel faceplate.

2) Back Cover Removal:

In Fig. 4-1, remove 4 screws indicated as “A” from the four corner of the back cover. Then
remove the back cover.

A

Fig. 4-1

3) Metallic Cover Removal:

In Fig. 4-2, remove 7 screws indicated as “B” from the back metallic cover. Then remove
the back metallic cover.

B

Fig. 4-2

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 11

4) 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 3 screws indicated as “C” from the inverter board, and then remove the board

carefully. (left side in Fig. 4-3)

(c) Remove 3 screws indicated as “D” from the audio board, and then remove the board

carefully.

(d) Remove 7 screws indicated as “E” from the main board connected with front cover. (Fig.

4-3)

C

DF

Fig. 4-3

E

5) Panel Removal:

(a) Remove 6 screws indicated as “F” from the front cover (Fig. 4-3) to remove the panel.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 12

5. General Connection and Applications

Procedures for installing and using this CML155XW LCD monitor are described as

below.

5.1 Connecting the monitor to a 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.

Analog video

Power jack

3) Plug the D-SUB 15-pin analog video signal cable (or 20-pin DFP cable) into the Analog

(or Digital) Video Input port on the back of the display. Connect the other end of the video
cable into your computer’s video port. The assignment of the pins of the connector is as
follows:

input port

Digital video
input port

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 13

Pin A s signment of 15-pin D-SUB connector

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

9
10
11
12

Red V ideo
Green V ideo
Blue V ideo
Monitor Ground
DDC-Return
Red Ground
Green Ground
Blue Ground

9
10
11
12
13
14
15

+5V for DDC circuit
Logic Ground
Monitor Ground
DDC-Serial Data
H-Sync.
V-Sync.
DDC-Serial Clock

Pin Assignment of 24-pin DVI-D co nnector

T.M.D.S. Data2­T.M.D.S. Data2+
T.M.D.S. Data2/4 Shield
T.M.D.S. Data4­T.M.D.S. Data4+
DDC Clock
DDC Data
No Connect
T.M.D.S. Data1­T.M.D.S. Data1+
T.M.D.S. Data1/3 Shield
T.M.D.S. Data3-

13

14

15

16

17

18

19

20

21

22

23

24

T.M.D.S. Data3+
+5V Power
Ground (for +5V)
Hot Plug Detect
T.M.D.S. Data0­T.M.D.S. Data0+
T.M.D.S. Data0/5 Shield
T.M.D.S. Data5­T.M.D.S. Data5+
T.M.D.S. Clock Shield
T.M.D.S. Clock+
T.M.D.S. Clock-

4) Connect the audio cable to the speaker input jack on the back of the display (the jack is

colored green to match the cable plug and the writed audio 1):

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 14

Audio 1 jack

5) First turn the PC power switch ON. Then apply power to the display by pressing the power

button to turn the monitor on. The power indicator LED will then illuminate.

Note: Do not force the cable into the connector; line it up carefully so that you don’t

bend the pins.

5.2 Connecting the monitor to an AV device

1) Plug the 4-pin s-video signal cable (or CVBS cable) into the S-video (or CVBS) Video

Input port on the back of the display. Connect the other end of the video cable into your
AV’s video port. The assignment of the pins of the connector is as follows:

Power jack

CVBS video
input port

S-video video
input port

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 15

Pin Assignment of 4-pin mini-din connector

1
2

2) Connect the audio cable to the speaker input jack on the back of the display (labeled

audio 2):

GND
GND

3

4

Y_in
C_in

Audio 2 jack

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 16

6. Electronic Circuit Description

The block diagram of CML155XW LCD monitor is shown in Appendix A.

6.1 Main Board Circuit

The circuit diagrams of main board are shown in Appendix B and the circuit diagrams of

audio board, keyboard and inverter are shown in Appendix C, D and E, respectively.

(1) Analog Interface

Refer to circuit diagram titled ‘Input Connector’ in Appendix B.
I. The analog R, G, B video input signals are supplied through the cable which is

terminated at P009 (i.e. CONNECTOR DB15). These input signals are approximately

0.7VPP in amplitude.
These and other signals which terminated at P009 are protected by D010~D015 (i.e.

HSK120) from electrostatic discharge (ESD) damage.
These R, G, B video signals are AC coupled via 0.01uF capacitors C244, C233 and

C226 and buffered via 100 ohm resisters R076, R069 and R067, and then fed into
I011:1 (i.e. GM5020) at pin E1, pin D2 and pin C1 respectively.
These analog R, G and B video signals are converted to their digital forms in I011:1.

II. The HSYNC and VSYNC signals are of TTL level in amplitude and also protected by

D016~D019 (i.e. HSK120). The protected version of these two signals are buffered via
I021 (i.e. 74HCT14D) and then fed into I011:1 at pin L2 and pin K1.

III. The signals terminated at P009 pin 12 and pin 15 are protected by D006~D009

(i.e. HSK120) and then connected to I014 (i.e. 24WC02).
I014 stores the EDID data that serves for the purpose of plug-and-play (P&P)
functionality.

The supply voltage of I014 (i.e., VCC at pin 8) is either from P009 pin 9 while
CML155XW V is powered off (the power plug of AC adapter is completely
disconnected from the power jack of CML155XW V) or from 5V source.

(2) Digital Interface

Refer to circuit diagram titled ‘Input Connector’ in Appendix B.
I. The TMDS LVDS (Low Voltage Differential Signal) input data pairs of digital R, G,

and B signals are supplied through the cable which is terminated at P008 (i.e. 74320-

4004) pin 18, 17, pin 10, 9 and pin 2, 1. and they are fed into I011:1 at pin C8, D8,
pin C9, D9, and pin C10, D10 respectively.

II. Also there is a pair of LVDS clock signals from pin 23 and 24 at P008 and fed into

I011:1 at pin C6 and D6.

III. The signals DDC/SCL and DDC/SDA terminated at P008 pin 6 and pin 7 are connected

to I013 (i.e. 24WC02). I013 stores the EDID data that serves

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 17

for the purpose of plug-and-play (P&P) functionality. The power supply of I013 is
from pin 14 (labeled DDC+5VDC) of P008.

(3) Memory Interface

Refer to circuit diagram titled ‘Frame Store’ in Appendix B.
There are three SDRAMs I015, I017, and I018 which provide the functionality of frame-

rate conversion..

(4) Output Interface

Refer to circuit diagram titled ‘OUTPUT INTERFACE ’) in Appendix B

There are 8-bit even and 8-bit odd signals for each R, G, B channels from I011:2 (i.e.
GM5020) that totally 48-bit data are fed into P010 and P011 via resistor buffers. Also
there are another 4 control signals that are fed into P010: CLK, DE, VS and HS (at pin 44,
42, 40, and 38 of P010 respectively).

(5) Microcontroller

Refer to circuit diagram titled ‘Host’ in Appendix B.
I. The Microcontroller I006 (TS87C51RD2-MCB) is running with the clock based on

20MHz crystal X001. Pin 35 of I006 (/EA1) is pulled-up to +5 volt via resistor to force
I006 read/write memory internally. It is important that pin 35 of I006 shall be so
pulled up for its proper operation and I002 (i.e. HT7044A provide reset signal for I006
reset signal for I006.

There is an interrupt signal comes from I011:5 pin R3 (IRQn) and is fed in to pin 14
of I006 (INT0).

The signal designated VGA_CON (pin R4 of I011:5) is used for the determination of
whether the analog signal video cable is connected to P009 or not. And the signal
designated DVI_CON (pin L1 of I011:5) is used for the determination of whether the
digital video signal cable is connected to P008 or not.

The signals designated HDATA0~HDATA3, HCLK and HFSn (between pin 2 ~ 7 of
I006 and pin R2, R1, P4, P3, P1 and P2 of I011:5) are used for the command and
data transfer between these two ICs.

The signal from pin 17 (P3.5) of I006 is the control signal for I003 (24LC16B ). And
the signal between pin 16 (P3.4) of I006 and pin 5 (SDA) of I003 is a bi-directional
data channel.

The signals designated KEY UP, KEY DOWN, KEY SEL, KEY ON/OFF between
I006 and P006 serve as user key command scan and sense. P0.6 and P0.7 of I006
controls the conduction and cut-off of transistors Q003 and Q002 to light the LEDs.

The signals designated VOLUME, AUDIO MUTE, and AUDIO SELECT between
I006 and P004 are used for audio board control.

The signal designated VOLUME_PWM is used for the volume of audio control. The

1

“/EA” means EA signal is active “low”.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 18

BKLT_PWM is used as backlight brightness control. BKLT_EN controls the
backlight’s on/off. And LCD_ON/OFF is used for turning on or off the LCD panel.

(6) Power

Refer to circuit diagram titled ‘POWER’ in Appendix B.
The DC +12V output of AC adapter is fed into the monitor through P002. This supply is

regulated by I009 and I012 to provide +5V for the whole system. And the +5V supply is
fed into I016, I005, I007, and I008 to provide multiple 3.3V and 2.5V supplies. The +12V
also is fed into I001 to provide 5.0V independent for video decoder chip.

6.2 Audio Board Circuit

The circuit diagrams of audio board circuit is shown in Appendix C.

6.3 Keyboard Circuit

The circuit diagrams of keyboard circuit is shown in Appendix D.

6.4 Inverter Circuit

The circuit diagrams of inverter is shown in Appendix E. The inverter supplies power for

backlight for the LCD panel.

HITACHI CML155XW LCD Monitor Service Manual (v1.0) 19

7. Troubleshooting Flow Chart

For troubleshooting the monitor, please refer to “troubleshooting flow chart” in Appendix F.

8 Proposed Repair Parts List

For proposed repair parts list please refers to the Appendix G.

9. Mechanical Disassembly

For mechanical disassembly, please refer to Appendix H.

.

10. PCB Layout

For PCB layout diagrams, please refer to Appendix I.

Appendix A

CML155XW
Main Board Block Diagram

CML155XW Main Board Block Diagram

p

p

R.G.B

ANALOG

DVI

CVBS

S-Video and

+12V DC

Power

Supply

EDID

EPROM

EDID

EPROM

VIDEO

DECODER

+2.5V
+3.3V
+5V
+12V

XTAL SDRAM

Gm5020

PLL
ADC

TMDS
DIGITAL VIDEO

OSD
SCALER
292 pin PBGA Package

TFT LCD PANEL

EPROM

Keypad

Audio

ut 1

in

Audio

in

AUDIO

SELECT

ut 2

MICROCONTROLLER

Audio Amplifier

INVERTER

Speaker/Earphone

Appendix B

CML155XW

Main Board Circuits

Appendix C

CML155XW
Audio Board Circuit

Appendix D

CML155XW
Key Board Circuit

Appendix E

CML155XW
Inverter Board Circuit

Appendix F

CML155XW

Troubleshooting Flow

Charts

No picture Appear

N

NoNoNoNoNoNoNoN

Picture
shows

MCU (I006) Hangs

Reset the MCU(I006)

by pushing the power
key or replugging the

DC 12V cable

Still no
Picture

Does the LED
light up

LED display is
amber

o

Is it entering into
power saving mode

Restart PC signal

to ensure H. V.

sync are not

absent

Yes

Yes

Yes

The Voltage of

L006 is 12V

Yes

The Voltage of
I012 #1 is 12V

Yes

The Voltage of

L016 is 5V

Yes

The Voltage at #40

of I006 is 5V

Replace F001

Replace F002

Replace I0012 &

D020

Check I006 socket is

loosened

End

Replace I006

End

End

Yes

The Voltage of I016

#2 is 3.3V

Yes

The Voltage of I008

#2 is 3.3V

Yes

The Voltage of I005

#2 is 2.5V

Yes

The Voltage of I007

#2 is 2.5V

Replace I016

Replace I008

Replace I005

o

Replace I007

The Ver. Or Hor.

f

t

NoNoN

Sync. Does not hold

Are the output o

GM5020(CLK,H,V,

DE) normal

Are the inpu

waveforms of

GM5020 normal

Yes

Replace I011

(GM5020)

Yes Yes

Are two flex cables

attached firmly at

P010 & P011

Tighten two flex
cables at P010 &

P011

End

Are two flex cables

attached firmly at

the LCD panel

connectors

Yes

Replace V901 (LCD

panel)

End

o

Tighten two flex

cables at P010 &

P011

End

End

Appendix G

CML155XW

Repair Parts List

THE UPDATED PARTS LIST

FOR THIS MODEL IS

AVAILABLE ON ESTA

Appendix

CML155XW

Mechanical Disassembly

H

Appendix

CML155XW

Printed Circuit Boards

I

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