Hitachi UT42X902 Schematic
SERVICE MANUAL
PA No. 0239
UT42X902 / D8MW
UT42V702 / D8MW
NTSC
ATSC
ready monitor
D8MW
UT42X902 - P#: HL02561 (CLU-4981S)
Chassis
SERVICE MANUAL REVISION HISTORY INFORMATION
DATE REVISION # REASON
Oct. 03, 2008 SM00001 FIRST ISSUE OF MANUAL
UT42V702 - P#: HL02562 (CLU-4982S)
Remote controls:
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LCD DISPLAY PANEL
OCTOBER 2008 HIMEX MANUFACTURING DIVISION
SERVICE MANUAL
NTSC
ATSC
ready monitor
D8MW
Chassis
PA No. 0239
UT42X902 / D8MW
UT42V702 / D8MW
Remote controls:
UT42X902 - P#: HL02561 (CLU-4981S)
UT42V702 - P#: HL02562 (CLU-4982S)
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
AGENCY REGULATORY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ACKNOWLEDGEMENTS AND TRADEMARKS . . . . . . . . . . . . . . . . . . . . . . . . . . 9
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
BASIC SETUP & OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TROUBLESHOOTING FLOWCHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CONNECTIONS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
FINAL WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
FINAL ASSEMBLY GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
DC VOLTAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
CIRCUIT SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
PRINTED CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
MAIN PARTS VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
CAUTION:
These servicing instructions are for use by qualied service personnel only. To reduce the
risk of electric shock do not perform any servicing other than that contained in the operating
instructions unless you are qualied to do so. Before servicing this chassis, it is important that
the service technician read the “IMPORTANT SAFETY INSTRUCTIONS” in this service manual.
SAFETY NOTICE: USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identied by a ! on the schematics and on the
parts list in this service data and its suplements and bulletins. Before servicing the chassis, it is important
that the service technician read and follow the “Important Safety Instructions” in this service manual.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LCD DISPLAY PANEL
OCTOBER 2008 HIMEX MANUFACTURING DIVISION
D8MW
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety-related notes
located on or inside the cover case and on the chassis or
LCD module.
WARNING: Since the chassis of this receiver is connected
to one side of the AC power supply during operation,
whenever the receiver is plugged in service should not
be attempted by anyone unfamiliar with the precautions
necessary when working on this type of receiver.
1. When service is required, an isolation transformer
should be inserted between power line and the receiver
before any service is performed on a “HOT” chassis
receiver.
2. When replacing a chassis in the receiver, all the
protective devices must be put back in place, such as
barriers, nonmetallic knobs, insulating cover-shields,
and isolation resistors, capacitors, etc.
3. When service is required, observe the original lead
dress (wiredress).
4. Always use manufacturer’s replacement components.
Critical components as indicated on the circuit diagram
should not be replaced by another manufacturer’s.
Furthermore, where a short circuit has occurred,
replace those components that indicate evidence of
over heating.
5. Before returning a serviced receiver 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, and be sure that no protective
device built into the receiver by the manufacturer has
become defective, or inadvertently defeated during
servicing.
Therefore, the following checks should be performed
for the continued protection of the customer and service
technician.
Leakage Current Cold Check
With the AC plug removed from the 120V AC 60Hz source,
place a jumper across Line 1 and Line 2 of the three plug
prongs, do not connect with the third prong, which is
physical ground.
Using an insulation tester (DC500V), connect one of its
leads to the AC plug jumper and touch with the other lead
each exposed metal part (antennas, screwheads, metal
overlays, control shafts, etc.), particularly any exposed
metal part having a return path to the chassis should
have a resistor reading over 4MΩ. Any resistance value
below this range indicates an abnormality which requires
corrective action. An exposed metal part not having a
return path to the chassis will indicate an open circuit.
Leakage Current Hot Check
Plug the AC line cord directly into a 120V AC outlet. (Do
not use an isolation transformer during this test.) Use a
leakage current tester or a metering system that complies
with the American National Standards Institute (ANSI)
C101.0 Leakage Current for Appliances. In the case of
the LCD monitor set the AC switch rst in the ON position and then in the OFF position, measure from across
Line 1 and Line 2 of the three plug prongs (do not connect with the third prong which is physical ground), to
all exposed metal parts of the instrument (antennas,
handle bracket, metal cabinet, screw heads, metallic
overlays, control shafts, etc.), especially any exposed
metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 MIU. Reverse
the instrument power cord plug in the outlet and repeat test.
AC LEAKAGE TEST
(USING ADAPTER AS
REQUIRED)
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE RECEIVER TO THE CUSTOMER.
NOTE:
Unplug the AC cord from the power
line before servicing the LCD TV
set.
The Main Power Switch does not
completely cut the AC power.
TABLE OF CONTENTS
2
D8MW
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in HITACHI television
receivers have special safety-related characteristics.
These 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 identied in this
Service Manual.
Electrical components having such features are identied
with a ! mark in the schematics and parts list in this
Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
HITACHI recommended replacement component, shown
in the parts list in this Service Manual, may create shock,
re, X-radiation, or other hazards.
Product safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current HITACHI Service
Manual. A subscription to, or additional copies of HITACHI
Service Manuals may be obtained at a nominal charge
from HITACHI Sales Corporation.
UT42X902 and UT42V702 - LCD monitors
1. Follow the general caution recommendations from
“Safety precautions” section.
2. If necessary to replace Panel module, this work must
be started after the panel module and the AC/DC Power
supply becomes sufciently cool.
3. Special care must be taken with the display area to
avoid damaging its surface.
4. The Panel Module shall not be touched with bare hands
to protect its surface from stains.
5. It is recommended to use clean soft gloves during the
replacing work of the Panel module in order to protect, not
only the display area of the panel module but also the
serviceman.
6. Signal, power supply P.W.B.’s and LCD driving circuits
P.W.B.’s are assembled on the rear side of the LCD
module, take special care with this fragile circuitry.
They are not strong enough to withstand harsh outer
mechanical forces. Extreme bending of the exible
connectors must be avoided too.
SAFETY NOTICE
USE ISOLATION TRANSFORMER
WHEN SERVICING
POWER SOURCE
This LCD television is designed to operate on 120
Volts/60Hz, AC house current. Insert the power cord
into a 120 Volts/60Hz outlet.
NEVER CONNECT THE LCD TV TO OTHER THAN THE
SPECIFIED VOLTAGE OR TO DIRECT CURRENT AND
TO 50HZ. TO PREVENT ELECTRIC SHOCK, DO NOT
USE THE LCD TELEVISION’S (POLARIZED) PLUG
WITH AN EXTENSION CORD, RECEPTACLE, OR THE
OUTLETS UNLESS THE BLADES AND GROUND
TERMINAL CAN BE FULLY INSERTED TO PREVENT
BLADE EXPOSURE.
TABLE OF CONTENTS
3
SERVICING PRECAUTIONS
D8MW
CAUTION: Before servicing instruments covered by this
service data and its supplements and addendum, read and
follow the information in previous pages number 2 and 3 of
this publication.
NOTE: If unforeseen circumstances create conict between
the following servicing precautions and any of the safety
precautions on the previous pages of this publication,
always follow the safety precautions. Remember: Safety
First.
General Servicing Guidelines
1. Always unplug the instrument AC power cord from the AC
power source before:
a. Removing or reinstalling any component, circuit board,
module, or any other instrument assembly.
b. Disconnecting or reconnecting any instrument electrical
plug or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the instrument.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explosion hazard.
2. Do not spray chemicals on or near this instrument or any
of its assemblies.
3. Unless specied otherwise in these service data, clean
electrical contacts by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
nonabrasive applicator: 10% (by volume) Acetone and 90%
(by volume) isopropyl alcohol (90%- 99% strength).
CAUTION: This is a ammable mixture. Unless specied
otherwise in these service data, lubrication of contacts is
not required.
4. Do not defeat any plug/socket of voltage interlocks with
which instruments covered by this service data might be
equipped.
5. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heatsinks
are correctly installed.
6. Always connect the test instrument ground lead to the
appropriate instrument chassis ground before connecting
the test instrument positive lead. Always remove the test
instrument ground lead last.
7. Use with this instrument only the test xtures specied in
this service data.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples
of typical ES devices are integrated circuits and some eld
effect transistors and semiconductor “chip” components.
The following techniques should be used to help reduce
the incidence of component damage caused by static
electricity.
1. Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commercially
available discharging wrist strap device, which should be
removed for potential shock reasons prior to applying power
to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or
desolder ES devices.
4. Use only an anti-static type solder removal device. Some
solder removal devices not classied as “anti-static” can
generate electrical charges sufcient to damage ES
device.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufcient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil or comparable conductive material.)
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into
which the device will be installed.
CAUTION: Be sure no power is applied to the chassis or
circuit, and observe all other safety
precautions.
CAUTION: Do not connect the test xture ground strap
to any heatsink in this instrument.
TABLE OF CONTENTS
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the
lifting of your foot from a carpeted oor can generate
static electricity sufcient to damage an ES device.)
4
D8MW
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and
appropriate tip size and shape that will maintain tip
temperature within the range 600°F to 800°F.
2. Use an appropriate lead free solder (see page 8). Lead
solder can be used, but there is a possibility of failure due
to insufcient strength of the solder.
3. Keep the soldering iron tip clean and well-tinned.
4. Thoroughly clean the surfaces to be soldered. Use a
small wire-bristle (0.5 inch or 1.25 cm) brush with a metal
handle. Do not use freon-propelled spray-on cleaners.
5. Use the following desoldering technique.
a. Allow the soldering iron tip to reach normal temperature
(600°F to 800°F).
b. Heat the component lead until the solder melts.
Quickly draw away the melted solder with an antistatic,
suction-type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach normal temperature
(600°F to 800°F).
b. First, hold the soldering iron tip and solder strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of
the component lead and the printed circuit foil, and hold it
there only until the solder ows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil or components.
d. Closely inspect the solder area and remove any
excess or splashed solder with a small wire-bristle
brush.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suctiontype
solder removal device (or with solder braid) before removing
the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad
and solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to areas.)
“Small-signal” Discrete Transistor Removal/
Replacement
1. Remove the defective transistor by clipping its leads as
close as possible to the component body.
2. Bend into a “U” shape the end of each of the three leads
remaining on the circuit board.
3. Bend into a “U” shape the replacement transistor leads.
4. Connect the replacement transistor leads to the
corresponding leads extending from the circuit board and
crimp the “U” with long nose pliers to insure metal to metal
contact, then solder each connection.
Power Output Transistor Devices Removal/
Replacements
1. Heat and remove all solder from around the transistor
leads.
2. Remove the heatsink mounting screw (if so equipped).
3. Carefully remove the transistor from the circuit board.
4. Insert new transistor in circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heatsink.
Use soldering iron to pry the leads.
IC Removal/Replacement
Some Hitachi unitized chassis circuit boards have slotted
holes (oblong) through which the IC leads are inserted
and then bent at against the circuit foil. When holes are
the slotted type, the following technique should be used
to remove and replace the IC. When working with boards
using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
TABLE OF CONTENTS
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicularly to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints
of the two “original leads”. If they are not shiny, reheat them
and, if necessary, apply additional solder.
5
Fuses and Conventional Resistor Removal/
Replacement
1. Clip each fuse or resistor lead at top of circuit board
hollow stake.
2. Securely crimp leads of replacement component around
stake 1/8 inch from top.
3. Solder the connections.
CAUTION: Maintain original spacing between the
replaced component and adjacent components and
the circuit board, to prevent excessive component
temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed
circuit board will weaken the adhesive that bonds the
foil to the circuit board, causing the foil to separate
from, or “liftoff,” the board. The following guidelines and
procedures should be followed whenever this condition is
encountered.
In Critical Copper Pattern Areas
High component/copper pattern density and/or special
voltage/current characteristics make the spacing and
integrity of copper pattern in some circuit board areas
more critical than in others. The circuit foil in these areas is
designated as Critical Copper Pattern. Because Critical
Copper Pattern requires special soldering techniques to
ensure the maintenance of reliability and safety standards,
contact your Hitachi personnel.
At IC Connections
To repair defective copper pattern at IC connections, use
the following procedure to install a jumper wire on the
copper pattern side of the circuit board. (Use this technique
only on IC connections.)
1. Carefully remove the damaged copper pattern with a
sharp knife. (Remove only as much copper as absolutely
necessary.)
2. Carefully scratch away the solder resist and acrylic
coating (if used) from the end of the remaining copper
pattern.
D8MW
At Other Connections
Use the following technique to repair defective copper
pattern at connections other than IC Pins. This technique
involves the installation of a jumper wire on the component
side of the circuit board.
DEFECTIVE
COPPER
REMOVED
Insulated jumper wire
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both wire sides of
the pattern break and locate the nearest component directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the nearest
component on one side of the pattern break to the lead of
the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so
that it does not touch components or sharp edges.
BARE JUMPER
WIRE
CRIMP AND
SOLDER
Install jumper wire and solder.
3. Bend a small “U” in one end of a small-gauge jumper
wire and carefully crimp it around the IC pin. Solder the IC
connection.
4. Route the jumper wire along the path of the cut-away
copper pattern and let it overlap the previously scraped
end of the good copper pattern. Solder the overlapped
area, and clip off any excess jumper wire.
TABLE OF CONTENTS
6
D8MW
Leadless Chip Components
(surface mount)
Chip components must be replaced with identical chips
due to critical foil track spacing. There are no holes in
the board to mount standard transistors or diodes. Some
chip capacitor or resistor board solder pads may have
holes through the board, however the hole diameter
limits standard resistor replacement to 1/8 watt. Standard
capacitors may also be limited for the same reason. It is
recommended that identical chip components be used.
Chip resistors have a three digit numerical resistance
code -1st and 2nd signicant digits and a multiplier.
Example: 162 = 1600 or 1.6KΩ resistor, 0 = 0Ω
(jumper).
Chip capacitors generally do not have the value indicated
on the capacitor. The color of the component indicates the
general range of the capacitance.
Chip transistors are identied by a two letter code. The
rst letter indicates the type and the second letter, the
grade of transistor.
Chip diodes have a two letter identication code as per the
code chart and are a dual diode pack with either common
anode or common cathode. Check the parts list for correct
diode number.
Component Removal
1. Use solder wick to remove solder from component
end caps or terminals.
2. Without pulling up, carefully twist the component
with tweezers to break the adhesive.
3. Do not reuse removed leadless or chip
components since they are subject to stress
fracture during removal .
Chip Component Installation
1. Put a small amount of solder on the board
soldering pads.
2. Hold the chip component against the soldering
pads with tweezers or with a miniature alligator
clip and apply heat to the pad area with a 30 watt
iron until solder ows. Do not apply heat for more
than 3 seconds
How to Replace Flat-lC
—Required Tools—
• Soldering iron • iron wire or small awl
• De-solder braids • Magnier
1. Remove the solder from all of the pins of a Flat-lC
by using a de-solder braid.
De-Solder
Braid
Soldering
Iron
2. Put the iron wire under the pins of the Flat-lC and pull
it in the direction indicated while heating the pins using a
soldering iron. A small awl can be used instead of the iron
wire.
Pull
Soldering
Iron
Iron
Wire
Awl
Soldering
Iron
3. Remove the solder from all of the pads of the Flat-lC by
using a de-solder braid.
Soldering
Iron
De-Solder
Braid
Flat-IC
4. Position the new Flat-lC in place (apply the pins of the
Flat-lC to the soldering pads where the pins need to be
soldered). Properly determine the positions of the soldering
pads and pins by correctly aligning the polarity symbol.
Polarity Symbol
TYPE
B
E
ANODES
MH DIODE
C
GRADE
TRANSISTOR
COMMON CATHODE
TABLE OF CONTENTS
Chip Components
SOLDER CAPS
1STDIGIT
RESISTOR
SOLDER
CAPS
CAPACITOR
2ND DIGIT
MULTIPLIER
= 1600 = 1.6K
5. Solder all pins to the soldering pads using a ne tipped
soldering iron.
Solder
Soldering
Iron
6. Check with a magnier for solder bridge between the pins
or for dry joint between pins and soldering pads. To remove
a solder bridge, use a de-solder braid as shown in the gure
below.
Bridge
Solder
De-Solder
Braid
Soldering
Iron
7
Information for service about the lead-free solder introduction.
Hitachi introduced lead-free solder to conserve the “Earth Environment”.
Please refer to the following before servicing.
(1) Characteristic of lead-free solder
Melting point of lead free solder is 40-50°C higher than solder containing lead.
(2) Solder for service
Following composition is recommended.
“ Sn - 3.0Ag - 0.5Cu “ , or “ Sn - 0.7 Cu “
Lead solder can be used, but there is a possibility of failure due to insufcient strength of the solder.
Caution when using solder containing lead.
Please remove previous solder as much as possible from the soldering point.
When soldering, please perfectly melt the lead-free solder to mix well with the previous solder.
(3) Soldering iron for lead-free solder.
Melting point of lead-free solder is higher than solder containing lead.
Use of a soldering tool “with temperature control” and “with much thermal capacitance” is recommended.
(Recommended temperature control : 320°C - 450°C; [608°F - 842°F])
Recommended temperature
PWB with chip parts 320°C +/- 30°C (608°F +/- 86°F)
PWB without chip parts 380°C +/- 30°C (716°F +/- 86°F)
Chassis, metal, shield etc. 420°C +/- 30°C (788 °F +/- 86°F)
D8MW
(4) Identication of lead-free PWB
2004 models >> lead-free solder is introduced
2006 models >> lead-free solder applied
On lead-free PWB, “F” is added at the beginning of stamp on PWB.
TABLE OF CONTENTS
8
AGENCY REGULATORY INFORMATION
Federal Communications Commission Notice
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/television technician for help.
FCC Information
This device complies with part15 of the FCC Rules.Operation is subject to the following two conditions :
(1) This device may not cause harmful interference and (2) This device must accept any interference
received, including interference that may cause undesired operation.
D8MW
Modications
The FCC requires the user to be notied that any changes or modications made to this device that are not
expressly approved by Hitachi Home Electronics (America), Inc. may void the user’s authority to operate
the equipment.
Cables
Connections to this device must be made with shielded cables with metallic RFI/EMI connector hoods to
maintain compliance with FCC Rules and Regulations.
Any cables that are supplied with the system must be replaced with identical cables in order to assure
compliance with FCC rules. Order Hitachi spares as replacement cables.
INDUSTRY CANADA AGENCY REGULATORY INFORMATION
This class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
ACKNOWLEDGMENTS
AND TRADEMARKS
HDMI, the HDMI logo and High-Denition Multimedia Interface are
trademarks or registered trademarks of HDMI Licensing LLC.
• VGA and XGA are trademarks of International Business Machines Corporation.
• VESA is a registered trademark of the Video Electronics Standard Association.
TABLE OF CONTENTS
9
D8MW
19-
12/16
(502)
40-
13/16
(1036.2)
36-
3/4
(934)
19-
11/16
(500)
28-
11/16
(728)
26-
11/16
(678)
1-
15/16
(50)
16-
5/16
(413.7)
7-
7/8
(200)
20-
3/4
(526.8)
12-
3/16
(310)
1-
9/16
(39.9) Max5-
3/8
(136)
1-
3/8
(35.0) Min
INTRODUCTION
This HITACHI Service Manual is intended for the qualied service personnel and it contains the necessary infor-
mation for troubleshooting the LCD television set in case of malfunction.
This service manual includes the information for the next models and chassis.
DIMENSIONS:
MODEL CHASSIS
UT42X902 D8MW
UT42V702 D8MW
Height: Excluding stand - 26 11/16”, Including stand - 28 11/16”.
Width: 40 13/16”.
Depth: Excluding stand - 1 9/16”, Including stand - 12 3/16”.
Weigth: Excluding stand - 18.0 kg; Including stand - 20.9 kg.
POWER RATINGS:
Indicated Value
No.
Model
Name
ChassisMax Rating
(W) (A)
1 UT42X902 243 2.3 D8MW
CIRCUIT PROTECTION:
2 UT42V702 243 2.3 D8MW
CAUTION: It is very important to replace the fuse with the same kind of fuse as original.
The fuse rating is indicated in the silk of the printed circuit board near the fuse location.
Example: Hitachi part number of the fuse is: FN00562.
High breaking capacity ceramic tube fuse (Time-Lag fuse)
This means the fuse rating is 6.3A, 250V.
TABLE OF CONTENTS
T6.3AH 250V
10
TERMINALS AND JACKS
D8MW
HDMI
MODEL
NAME
UT42X902 1 1 1 1 1 1
UT42V702 1 1 1 1 1 1
MAIN FEATURES
• Ultra-slim-line LCD monitor.
• Large-screen and high denition LCD.
• Enjoy high resolution display (1920 (H) x 1080 (V) pixels).
• Improved digital signal processor.
• High quality sound with deeper, richer tones and bass boost.
• Accepts a digital input device with HDMI terminal.
• Enjoy the image from your PC with a large, high-denition LCD screen.
• Easy-to-use On-screen Display system operated by remote control.
• Low power consumption with power saving feature.
SPECIFICATIONS
TERMINAL
HDMI
D-SUB 15 PIN
ANALOG
RGB
COMPOSITE
VIDEO
3.5 MINI
JACK
ANALOG
AUDIO
8 PIN
MINI-DIN
RS-232C
3.5 STEREO
MINI JACK
IR-
THROUGH
SPECIFICATION UT42X902 UT42V702
Panel
Ambient
conditions
Power supply AC120V, 60Hz
Audio output speaker 6W + 6W
HDMI input
RGB/Composite
input
* This analog audio input terminal can be used for PC (RGB) or HDMI-DVI.
Display dimensions Approx. 42 inches measured diagonal (36 3/4 (H) x 20 3/4 (V) in.
Resolution 1920 (H) x 1080 (V) pixels
Temperature Operating: 5ºC to 35ºC, Storage: 0ºC to 40ºC
Relative humidity Operating: 20% to 80%, Storage: 20% to 90% (non-condensing)
Input terminals
Input signals
Input terminals
Input signals
Sync signals H/V separate, TTL level [2KW]
HDMI: HDMI input terminal
Audio input terminal (Mini-pin)*
HDMI: VGA/60, 480i, 576i, 480p, 576p, 720p/50, 720p/60, 1080i/50,
1080i/60, 1080p/50, /1080p/60, 1080p/24.
Analog RGB input terminal (D-sub 15 pin)
Audio input terminal (Mini-pin)*
0.7 Vp-p, analog RGB (Recommended Signal)
Composite video: NTSC3.58, NTSC4.43, PAL, SECAM, PAL60, PAL-M,
PAL-N.
TABLE OF CONTENTS
11
BASIC SETUP AND OPERATION
For more information on connecting and using the monitor, refer to the owner’s guide.
. Connect the power cord to the rear panel.
3 Connect to external equipment.
Example 1: Connecting to PC
To insert D-sub 15 pin, tilt the monitor forward and bring the terminals into view. Two people are required
to hold the monitor and insert D-sub 15 pin safely. Be careful not to damage the panel.
*D-sub 15 and Audio cables are not included.
Example 2: Connecting to DVD player
*
*
Audio Cable
D-Sub 15
Tilt Forward
HDMI Cable
Power Cord
HDMI Cable
Power On...
. Connect the plug into the wall socket after all other
connections are completed.
CAUTION
Ensure that both ends of the power cord are easily
accessible.
The Main Power Switch is factory set to On
(activated), therefore after you connect the plug into
the wall socket, the color of the indicating lamp must
turn Green and the Illumination Lamp turns Blue.The
image will display on screen.
Once the Main Power switch is on, you can turn On/
Off by pressing the Power (On/Off) button on the
remote control.
If no equipment is connected to the Monitor the color
of the indicating lamp turns to Orange, and the
Illumination Lamp turns off indicating Power Save
Mode.
AC
Wall
Socket
Monitor
Rear
Panel
Main Power Switch
(on the underside)
Front
Rear
Illumination Lamp
Indicating Lamp
D8MW
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12
BASIC SETUP AND OPERATION
Front Panel
Rear Panel
.
Cabinet
3
Panel
$
Remote Control Receiver
/
Indicating Lamp
1
Speaker
4
Illumination Lamp
2
Desktop Stand
&
Ÿ button
'
ź button
)
Volume Up/Ź button
*
Volume Down/Ż button
+
Input Select/OK button
Menu/Exit button
.
Power Cord Socket
3
HDMI Input Terminal
Please refer to the owner’s guide for detailed information regarding the connections.
.
3
$
/
1
4
2
(
Main Power switch
,
Service use only
"
RS232C
0
PC (RGB)/DVI Analog Audio Input Terminal
#
PC Connection Terminal (D-sub 15 Pin)
%
Reset button.
(,"0#
')*&+
Control panel (located on the bottom)
MENU/EXIT VOLINPUT/OK
%
3 .
D8MW
TABLE OF CONTENTS
13
ADJUSTMENTS
TO GO TO A SECTION, CLICK ON ITS HEADING BELOW.
TABLE OF CONTENTS OF ADJUSTMENTS
1. Adjustment procedure start-up
1.1 How to get to the service mode menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.2 Changing data and selecting adjustment codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2. Memory Initialize
2.1 EEPROM All Initialize operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2 EEPROM renew procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3 Memory Initialize affected adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3. Video Adjustment
3.1 RGB amplitude adjustment (PC D-SUB input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 NTSC Composite video adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4. Video Color Temperature adjustment
4.1 Video Color Temperature adjustment (Cool) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Video Color Temperature adjustment (Normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Video Color Temperature adjustment (Warm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5. Another procedure to set to factory shipping conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1 Factory Shipping Conditions table 20
6. Software upgrade procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
D8MW
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14
D8MW
1. ADJUSTMENT PROCEDURE START-UP
The UT42X902 and the UT42V702 LCD Monitors run through
a series of adjustments at the factory.
After servicing, these adjustments must be done again.
NOTE: - S/W version check -
The software version of the LCD monitor can be checked
under the SETUP OSD menu. The next image shows the
OSD where the version number is shown.
Main
S/W
Till this day, the latest software versions are:
Model Main S/W Sub S/W
All UT42” VS224 223
Sub
S/W
1.2 Changing data and selecting adjustment
codes.
When the UT monitor is in the Service Mode, use the remote
control cursor keys ◄, ►, ▲, ▼ to make the adjustments.
The bottom control panel in the UT monitor can also be used
for making the adjustments.
A. Use the Remote Control:
The ▲, ▼, keys are used for selecting the adjustment
item (in the same page).
The ◄, ► keys are used for changing the data values.
Use the VOL UP/DWN remote control button to scroll thru
the diferent Service Menu pages.
The “OK” button is equal to “Enter” key.
Next picture shows the R/C buttons mentioned in the previous explanation.
The software is subject to change, for the latest software call
1-800-HITACHI or log on to the Hitachi Service only web site
www.hitachiserviceusa.com.
1.1 How to get to the Service Mode Menu
The Service Mode Menu can be reached by following the
next sequence:
1. With TV in the off condition (with Main Power Off)
a) Press and hold Menu key of the bottom control panel,
while holding the menu key, press and release the master
power button.
b) Keep pressing the menu key until the Service Menu
appears on screen, release menu key.
2. To exit the Service Mode press [MENU] key of the remote
control or the UT monitor, the user menu OSD will appear.
The next picture shows the Service Mode OSD for the 42”
models(example).
Main
S/W
Sub
S/W
Service
NO. DATA VS224 42LW-A MU 146 Sub223
0: 208
1: 230
2: 237
3: 215
4: 224
5: 213
6: 223
7: 224
8: 187
9: 224
VOLUME
button
cursor
buttons
OK button
H: 33.6 V: 59.7 L: 562
TABLE OF CONTENTS
15
D8MW
INPUT/OK
VOLMENU/EXIT
B. Use the Control Panel (located at the bottom):
Menu/Exit button is for calling the OSD menu or for exiting
such menu or any other OSD.
Input/Select button is for changing the displayed input or,
when some OSD is beeing displayed, to be able to select
the highlighted option.
◄ Vol - button is for reducing the audio volume or equiva-
lent to the Left cursor key when an adjustment value is
highlighted.
► Vol + button is for increasing the audio volume or
equivalent to the Right cursor key when an adjustment
value is highlighted.
▲ button is same as the R/C Up cursor button.
▼ button is same as the R/C Down cursor button.
The next gures show the labels of the bottom control panel
and a bottom view of the buttons.
2.2 EEPROM RENEW Procedure:
There are two methods.
FIRST METHOD.
(1) Enter Service Mode by the procedure in section 1.1.
(2) Change the data value of the adjustment item no. 659
from “0” to “1”.
(3) Push the OK button in the remote control. The picture will
disappear indicating that the initialization of the EEPROM is
started.
(4) About 2 seconds later, the initialization will nish and the
picture will appear again. Do not turn of the power until the
picture appears again.
(5) Set the adjustment item no. 630 to data value 6.
SECOND METHOD.
(1) Turn off the monitor by side panel power switch.
(2) Turn on the side panel power switch while keeping
pushed the up cursor key of the bottom control panel for
more than 5 seconds.
Conrm the settings are in factory shipping conditions (refer
to section 5.1 of this manual).
2.3 Memory initialize affected adjustments:
2. MEMORY INITIALIZE
The memory initialize operation is to clear the contents of
the data memory and to set all adjustment values to initial
default.
CAREFUL: The data that will be lost is shown in the section
no. “2.3 Memory initialize affected adjustments”.
2.1 EEPROM ALL INIT Procedure:
(1) Enter Service Mode by the procedure in section 1.1.
(2) Select adjustment item no. 657 and push the OK button
(the remote control must be set in normal TV mode).
The picture will disappear, and the initialization of the EE-
PROM will start.
The next table shows the adjustment items which are affected
by the Memory Initialize EEPROM ALL INIT operation and
EEPROM RENEW operation.
Adjustment ALL INIT RENEW
White balance Reset Not reset
Amplitude Reset Not reset
Item no. 657 Reset Not reset
3. VIDEO ADJUSTMENT
The next adjustments are related with the picture quality.
Special care must be put.
3.1 RGB amplitude adjustment (PC D-SUB input)
Adjustment preparations
(1) Turn on the UT monitor, allow a 20 minutes heat-run before beginning the adjustment.
(2) Input the PC VGA[60Hz] adjustment signal into the PC
D-SUB input terminal.
(3) The adjustment signal pattern is an 8 color bar. The black
should be at the pedestal level.
(3) About 2 seconds later, the initialization process will nish
and the picture will appear again. NOTE: Do not turn of the
(4) White level amplitude = 700 mV (100% of signal stan-
dard).
power until the picture appears again.
(4) Set the adjustment item no. 630 to data value 6.
TABLE OF CONTENTS
16
D8MW
The next ghraphs show the waveform of the PC VGA[60Hz]
adjustment signal.
[mV]
700.0
Wh Ye Cy Gr Mg Re Bl Bk
G
0
-300.0
[mV]
700.0
Wh Ye Cy Gr Mg Re Bl Bk
B
0
[mV]
700.0
Wh Ye Cy Gr Mg Re Bl Bk
R
NOTE: Request this optional cable to Hitachi under the
next part numbers:
EW09192 - DSUB(LOW)-RCA CABLE 200MM
(4) The adjustment signal pattern is all white (The burst can
be disregarded).
(5) Set the amplitude of the adjustment signal [100% all
white] to 750.0 mV which is 105% (100% of the standard
signal is equal to 714.3 mV). The next graphics show the
white raster pattern and the waveform of the signal.
All white raster pattern.
[mV]
750.0
G
0
-300.0
White signal waveform.
0
Adjustment procedures
(1) Receive the PC adjustment signal.
(2) Select the adjustment item no. 658 of service adjustment
menu and push the OK button during 2 seconds or more.
The automatic adjustment will start.
(3) When the on screen display appears again, the automatic adjustment is nished.
3.2 NTSC Composite Video Adjustment
Adjustment Preparations
(1) Turn on the UT monitor and allow a 20 minutes heat-run
before starting the adjustment.
(2) Change the RGB input setting of the MENU’s second
page to “Composite”.
(3) Input the composite video adjustment signal into the
RGB D-SUB terminal. Consider the use of the next optional
cable.
EW09192
Adjustment Procedure
(1) Enter the Service Mode Menu by following the procedure
in section 1.1.
(2) Input the NTSC composite signal to the UT Monitor.
(3) Select the no. 658 adjustment item in the Service Mode
Menu and push the OK button for more than 2 seconds.
(4) The OSD will disappear for a brief moment. Once it appears again, the adjustment is nish.
(5) NOTE: Do not turn off the UT monitor until the OSD reappears.
4 VIDEO COLOR TEMPERATURE ADJUSTMENT.
The next adjustments are for setting the color coordinates or
color temperature of the picture.
4.1 Cool mode.
Adjustment preparations
(1) Adjustment signal: HDMI 1080i
Signal pattern: White raster.
Video level: 90%.
(2) Picture settings: Factory setting, check that the mode is
set as Factory shipping conditions.
Picture mode: Dynamic.
D-Sub 15 pin < ------- > RCA plug.
(3) The color analizer (CA-210) should be veried by a spectrum radiation brightness meter such as CS-1000 or stan-
The green color is connected.
TABLE OF CONTENTS
dard LCD.
17
D8MW
(4) Set the aspect to full mode.
(5) Set the color analizer (CA-210) at the center of the pan-
el.
Adjustment procedures
(1) Enter the Service mode.
(2) Check that the adjustment items no. 0, no. 1 and no. 2
of the Service Mode menu have the next initial values. If the
initial values are different, set them as the following data.
No. 0 = 230
No. 1 = 230
No. 2 = 240
(3) Receive the white raster signal. Step down two (or only
one) of either of the R DRV_COOL, G DRV_COOL or B
DRV_COOL adjustment parameters and change to the
following values
(NOTE: At least one of the adjustment parameters should
remain in the initial data value).
4.2 Normal Mode.
Adjustment preparations
(1) Adjustment signal: HDMI 1080i
Signal pattern: White raster
Video level: 90%
(2) Picture settings: Factory setting. Check that the mode is
set as the factory shipping conditions.
Picture mode: Dynamic.
(3) The color analyzer (CA-210) should be veried by a
spectrum radiation brightness meter such as the CS-1000
or standard LCD.
(4) Set aspect to full mode.
(5) Set the color analyzer (CA-210) at the center of the pan-
el.
Adjustment procedures.
(1) Enter the Service mode by following the procedure in
section 1.1.
(2) Check that the initial data of the adjustment items no. 3,
4 and 5 are in the following values. If their initial values are
different, change them as shown.
Specication
Video Color Temperature (Cool)
x = 0.266 ± 0.005
y = 0.270 ± 0.005
14000K ± 0MPCD
REMARKS
(1) Color temperature should be adjusted under the condi-
tion in which the screen is the brightest, thus, the initial value
of the adjustment is set at its maximum.
This adjustment only decreases brightness.
(2) Beware, there is RESET in each picture mode.
(3) When the adjustment items no. 6, 7 or 8 are selected, the
color temperature of the picture changes to warm mode.
No. 3 = 224
No. 4 = 224
No. 5 = 224
(3) Receive the white raster signal. And decrease the value
of any two (or only one) of the R DRV_NORMAL, G DRV_
NORMAL or B DRV_NORMAL adjustment parameters in or-
der to get the X/Y coordinates to the following values.
Specication
Video Color Temperature (Normal)
x = 0.285 ± 0.005
y = 0.293 ± 0.005
9300K ± 0MPCD
REMARKS
(1) Color temperature should be adjusted under the condi-
tion in which the screen is the brightest, thus, the initial value
of adjustment is set at its maximum.
TABLE OF CONTENTS
(2) Beware there is RESET in each of the picture mode.
(3) When the adjustment items no. 6, 7 or 8 are selected, the
color temperature changes to warm mode.
18
D8MW
4.3 Warm mode.
Adjustment preparations.
(1) Adjustment signal: HDMI 1080i
Signal pattern: White raster
Video level: 90%
(2) Picture settings: Factory shipping conditions.
Picture mode: Dynamic.
(3) The color analyzer (CA-210) should be veried by a
spectrum radiation brightness meter such as the CS-1000
or an LCD standard.
(4) Set the aspect to full mode.
(5) Set the color analyzer (CA-210) at the center of the pan-
el.
(6) Adjustment of color temperature cool mode and normal
mode should be nished.
Adjustment procedures.
(1) Enter the Service mode menu by following the procedure
in the section 1.1.
(2) Check that the initial data of the adjustment items no. 6,
7 and 8 are in the below shown values. If they are different,
change them to...
(4) Color temperature Warm synchronizes with the drive data
of the Normal mode color temperature. Therefore, when the
drive data of Normal color temperature is changed, the drive
data of the Warm color temperature is changed too.
5. Another procedure to set to Factory shipping
conditions
Adjustment procedures
(1) Turn off the power (Power indicator: Off)
(2) Push the ▲ key of the bottom control panel and turn on
the power of the UT monitor while keeping the up cursor key
pushed for more than 5 seconds.
(3) Verify the values of the factory shipping conditions according with the table in the next page.
(4) Set the adjustment item no. 630 to data value 6.
No. 6 = 224
No. 7 = 224
No. 8 = 224
(3) Receive the white raster signal. And decrease one or
two of the parameters R DRV_WARM, G DRV_WARM, or B
DRV_WARM in order to meet the X/Y coordinates with the
below values.
NOTE: At least one of the parameters should remain in the
initial value.
Specication
Video Color Temperature (Warm)
x = 0.313 ± 0.005
y = 0.329 ± 0.005
6500K ± 6.5MPCD
REMARKS
(1) Color temperature should be adjusted under the condi-
tion in which the screen is the brightest, thus, the initial value
of adjustment is set at its maximum.
(2) Beware there is RESET in each of picture mode.
(3) When the adjustment items no. 6, 7 or 8 are selected, the
color temperature of the picture changes to warm mode.
TABLE OF CONTENTS
19
5.1 Factory shipping conditions:
D8MW
Item
Power Switch On (The switch is pushed condition.)
Volume 20
Mute Off
Picture Mode Dynamic
Contrast +31
Brightness 0
Color +3
Sharpness 0
Tint -1
Color Temperature Cool
Back Light +20
Deep Color Off
Contrast Mode Dynamic
3D Color Management On
Black Enhancement Middle
Picture
(HDMI/
Composite)
Picture
(RGB)
DNR Middle
MPEG NR Low
Cross Color NR Low
Game Mode Off
Film Mode Smooth2
3D Comb Filter Low
Amplitude Red 0
Color
Temp.
Adjus
Contrast +31
Brightness 0
Color 0
Tint 0
Color Temperature Normal
Amplitude Red 0
Color
Temp.
Adjust
Back Light +20
Green 0
Blue 0
Cut off Red 0
Green 0
Blue 0
Green 0
Blue 0
Cut off Red 0
Green 0
Blue 0
Initial data
42” UT monitor
Off
Off
Remarks
RGB
Input=Composite
only
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20
5.1 ... factory shipping conditions continued.
D8MW
Item
Audio Treble +6
Bass +2
Balance 0
Surround Off
Bass Boost On
Clear Voice Off
Perfect Volume Off
Speakers On
Function System ― Grayed out
HDMI Control Auto Input Change Off
System Standby None
AV Center Control Off
Setup
(HDMI)
Setup
(RGB)
Language English (US)
Video Power Save Off
RGB Input RGB Grayed out
Color System Auto Grayed out
Auto Adjust ―
Horizontal Position 0
Vertical Position 0
Horizontal Clock 0
Clock Phase 0
Frequency Display On
WXGA Mode Off
RGB Input RGB
Initial data
42” UT monitor
Remarks
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Instruction in software renewal
After software version up, set the following lists for reference.
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