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PA No. 0198
42EDT41A
CMP420V1A / CMP420V2A
SERVICE MANUAL
PW1A
NTSC R/C: CLU-W900 / SMK
Chassis
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW
Caution
Be sure to read this manual before servicing. To assure safety from fire, electric shock, injury, harmful radiation
and materials, various measures have been provided for in this HITACHI Plasma display service manual.
Be sure to read all cautionary items described in the manual to maintain safety before servicing.
Service Warning
1. Since the Panel Module and front Filter are made of glass, handle a broken Module and/or Filter with
sufficient care, in order not to be injured.
2. Repair work should not be started until after the Panel Module and the AC/DC Power supply have cooled
sufficiently.
3. Special care should be exercised in the proximity of the display area in order not to damage its surface.
4. The Panel Module should not be touched with bare hands, as this will protect its surface from stains.
5. It is recommended to use clean soft gloves during the repair work in order to protect not only the display
area of the Panel Module but also the technician.
6. The Chip Tube of the Panel Module (located in the upper left corner of the back of the glass panel)
is very fragile; as well, the flat cables connecting the Panel to the drive circuit PWBs are very weak. Take
care not to damage these, otherwise, the panel will never light again.
Contents
1. Safety Precaution------------------------------------ 2 CH 3
9. Connector Connection Diagram-----------------61
2. Precaution -------------------------------------------- 21 10. Circuit Board Layers-----------------------------63
CH 1, CH 2
3. Features ---------------------------------------------- 21 11. Basic Circuit Diagram----------------------------64
4. Specifications---------------------------------------- 22 12. Printed Wiring Board Diagram-----------------68
5. Service Points---------------------------------------27 13. Disassembly Diagram---------------------------- 71
6. Service Mode Access --------------------------------28 14. Replacement Parts List ---------------------------- 72
7. Troubleshooting Flow Chart----------------------55 15. DC Voltages ----------------------------------------- 74
8. Block Diagram---------------------------------------58 16. Speaker Installation ------------------------------- 82
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
PLASMA DISPLAY PANEL
NOVEMBER 2004
Version 0198.3
HHEA-MANUFACTURING DIVISION
PW1A
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety-related notes Leakage Current Hot Check
located on or inside the cover case and on the chassis or plasma This check must be done considering the AVC or the PDP
module. monitor as one instrument each.
WARNING: Since the chassis of the AVC unit and Plasma Panel With any of the instruments completely reassembled (being
unit is connected to both sides of the AC power supply during the instrument either the AVC center or the PDP monitor), plug
operation, whenever the receiver is plugged in, service should the AC line cord directly into a 120V AC outlet. (Do not use an
not be attempted by anyone unfamiliar with the precautions isolation transformer during this test.) Use a leakage current
necessary when working on this type of receiver. tester or a metering system that complies with the American
National Standards Institute (ANSI) C101.0 Leakage Current
1. When service is required, an isolation transformer should be for Appliances. In the case of the PDP monitor set the AC
inserted between power line and the receiver before any switch first in the ON position and then in the OFF position,
service is performed on a "HOT" chassis receiver. measure from across Line 1 and Line 2 of the three plug
prongs, do not connect with the third prong, which is physical
2. When replacing a chassis in the receiver, all the protective ground, to all exposed metal parts of the instrument
devices must be put back in place, such as barriers, non- (antennas, handle bracket, metal cabinet, screw heads,
metallic knobs, insulating cover-shields, and isolation metallic overlays, control shafts, etc.), especially any exposed
resistors, capacitors, etc. metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 MIU. Reverse the
3. When service is required, observe the original lead dress. instrument power cord plug in the outlet and repeat test.
AC LEAKAGE TEST
4. Always use manufacturer's replacement components. Critical
components as indicated on the circuit diagram should not be (READING
replaced by another manufacturer's. Furthermore, where a SHOULD NOT
LEAKAGE BE ABOVE 0.5MIU)
short circuit has occurred, replace those components that CURRENT
indicate evidence of over heating. DEVICE TESTER
UNDER
5. Before returning a serviced receiver to the customer, the TEST
service technician must thoroughly test the unit to be certain TEST ALL
EXPOSED
that it is completely safe to operate without danger of electrical METAL SURFACES
shock, and be sure that no protective device built into the EARTH
3-WIRE CORD
receiver by the manufacturer has become defective, or GROUND
inadvertently defeated during servicing. ALSO TEST WITH PLUG
REVERSED
Therefore, the following checks should be performed for the (USING AC ADAPTER
PLUS AS REQUIRED)
continued protection of the customer and service technician.
Leakage Current Cold Check ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED
With the AC plug removed from the 120V AC 60Hz source, ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD
place a jumper across Line 1 and Line 2 of the three plug AND MUST BE CORRECTED BEFORE RETURNING THE
prongs, do not connect with the third prong, which is physical RECEIVER TO THE CUSTOMER.
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 4M. 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.
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PW1A
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in HITACHI television PDP Module Handling
receivers have special safety-related characteristics. These are
often not evident from visual inspection nor can the protection When there is need to replace a broken PDP module which is the
afforded by them necessarily be obtained by using replacement displaying device from the Plasma monitor unit, consider the
components rated for higher voltage, wattage, etc. Replacement following:
parts which have these special safety characteristics are
identified in this Service Manual. 1. When carrying the PDP module, two persons should stand at
both shorter-edge sides of the glass-panel and transport it with
Electrical components having such features are identified with a their palms. Avoid touching the Flexible Printed Circuits or the
1 mark in the schematics and parts list in this Service Manual.
! chip tube on the corner of the glass-panel. Handle only by the
surface of the glass panel. In case of some PDP modules,
The use of a substitute replacement component which does not electrode repair is done by connecting between regular
have the same safety characteristics as the HITACHI- terminal with Cu tape and Cu wire. Please do not hook and/or
recommended replacement component, shown in the parts list in damage this repair line. If it is damaged, the module will not
this Service Manual, may create shock, fire, X-radiation, or other function unless the glass-panel is exchanged with a new
hazards. glass-panel.
2. When carrying PDP module, watch surrounding objects, such
Product safety is continuously under review and new instructions as tables, and also do not carry it alone since it may be
are issued from time to time. For the latest information, always dangerous and it will be damaged due to excessive stress to
consult the current HITACHI Service Manual. A subscription to, the module (glass-panel).
or additional copies of HITACHI Service Manuals may be 3. Please do not stand the module with the edge of the glass-
obtained at a nominal charge from HITACHI Sales Corporation. panel on the table since this might result in damage to the
glass-panel and/or flexible printed circuits due to excessive
1. Follow the general caution recommendations from "Safety stress to the module (glass-panel).
precautions" section.
WARNING
42EDT41A - Plasma Monitor Panel Lead in solder used in this product is listed by the California
CMP420V1A - Plasma Monitor Panel Health and Welfare agency as a known reproductive toxicant
CMP420V2A - Plasma Monitor Panel which may cause birth defects or other reproductive harm
(California Health and Safety Code, Section 25249.5).
1. Follow the general caution recommendations from "Safety
precautions" section. When servicing or handling circuit boards and other components
2. Since the Panel module and front filter are made of glass, which contain lead in solder, avoid unprotected skin contact with
sufficient care shall be taken when handling the broken solder. Also, when soldering make sure you are in a well
module and filter in order to avoid injury. ventilated area in order to avoid inhalation of any smoke or
3. If necessary to replace Panel module, this work must be fumes released.
started after the panel module and the AC/DC Power supply
becomes sufficiently cool. SAFETY NOTICE
4. Special care must be taken with the display area to avoid USE ISOLATION TRANSFORMER
damaging its surface. WHEN SERVICING
5. The Panel Module shall not be touched with bare hands to
protect its surface from stains. POWER SOURCE
6. It is recommended to use clean soft gloves during the
replacing work of the Panel module in order to protect, not This plasma television and the AVC Center is designed to
only the display area of the panel module but also the operate on 120 Volts/60Hz, AC house current. Insert the power
serviceman. cord into a 120 Volts/60Hz outlet.
7. The Chip Tube of the panel module (located upper left of the
back of the panel module) and flexible cables connecting NEVER CONNECT THE PLASMA AND THE AVC CENTER TO
Panel glasses to the drive circuitry Printed Wiring Boards OTHER THAN THE SPECIFIED VOLTAGE OR TO DIRECT
(P.W.B.) are very weak, so sufficient care must be taken to CURRENT AND TO 50HZ. TO PREVENT ELECTRIC SHOCK,
prevent breaking or cutting any of these. If the Chip Tube DO NOT USE THE PLASMA TELEVISION'S (POLARIZED)
breaks the panel module will never work, replacement for a PLUG WITH AN EXTENSION CORD, RECEPTACLE, OR THE
new plasma panel module will be needed. OUTLETS UNLESS THE BLADES AND GROUND TERMINAL
8. Signal, power supply P.W.B.'s and PDP driving circuits CAN BE FULLY UNSERTED TO PREVENT BLADE
P.W.B.'s are assembled on the rear side of the PDP module, EXPOSURE.
take special care with this fragile circuitry; particularly, Flexible
Printed Circuits bonded to surrounding edges of the glass
panel. They are not strong enough to withstand harsh outer
mechanical forces. Avoid touching the flexible printed circuits
by not only your hands, but also tools, chassis, or any other
object. Extreme bending of the connectors must be avoided
too. In case the flexible printed circuits are damaged, the
corresponding addressed portions of the screen will not be lit
and exchange of a glass panel will be required.
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SERVICING PRECAUTIONS
CAUTION: Before servicing instruments covered by this service Electrostatically Sensitive (ES) Devices
data and its supplements and addenda, read and follow the Some semiconductor (solid state) devices can be damaged
"Important Safety Instructions" on page 3 of this publication. easily by static electricity. Such components commonly are called
NOTE: If unforeseen circumstances create conflict between the Electrostatically Sensitive (ES) Devices. Examples of typical ES
following servicing precautions and any of the safety precautions devices are integrated circuits and some field-effect transistors
on page 3 of this publication, always follow the safety and semiconductor "chip" components. The following techniques
precautions. Remember: Safety First. should be used to help reduce the incidence of component
damage caused by static electricity.
General Servicing Guidelines
1. Always unplug the instrument AC power cord from the AC 1. Immediately before handling any semiconductor component
power source before: or semiconductor-equipped assembly, drain off any
a. Removing or reinstalling any component, circuit board, electrostatic charge on your body by touching a known earth
module, or any other instrument assembly. ground. Alternatively, obtain and wear a commercially
available discharging wrist strap device, which should be
b. Disconnecting or reconnecting any instrument electrical removed for potential shock reasons prior to applying power to
plug or other electrical connection. the unit under test.
c. Connecting a test substitute in parallel with an electrolytic 2. After removing an electrical assembly equipped with ES
capacitor in the instrument. devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
CAUTION: A wrong part substitution or incorrect polarity exposure of the assembly.
installation of electrolytic capacitors may
result in an explosion hazard. 3. Use only a grounded-tip soldering iron to solder or desolder
ES devices.
2. Do not spray chemicals on or near this instrument or any of its
assemblies. 4. Use only an anti-static type solder removal device. Some
solder removal devices not classified as "anti-static" can
3. Unless specified otherwise in these service data, clean generate electrical charges sufficient to damage ES device.
electrical contacts by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or 5. Do not use freon-propelled chemicals. These can generate
comparable nonabrasive applicator: 10% (by volume) electrical charges sufficient to damage ES devices.
Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength). 6. Do not remove a replacement ES device from its protective
CAUTION: This is a flammable mixture. Unless specified package until immediately before you are ready to install it.
otherwise in these service data, lubrication of (Most replacement ES devices are packaged with leads
contacts is not required. electrically shorted together by conductive foam, aluminum foil
or comparable conductive material.)
4. Do not defeat any plug/socket of voltage interlocks with which
instruments covered by this service data might be equipped. 7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective
5. Do not apply AC power to this instrument and/or any of its material to the chassis or circuit assembly into which the
electrical assemblies unless all solid-state device heat-sinks device will be installed.
are correctly installed. CAUTION: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
6. Always connect the test instrument ground lead to the
appropriate instrument chassis ground before connecting the 8. Minimize bodily motions when handling unpackaged
test instrument positive lead. Always remove the test replacement ES devices. (Otherwise harmless motion such as
instrument ground lead last. the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
7. Use with this instrument only the test fixtures specified in this sufficient to damage an ES device.)
service data.
CAUTION: Do not connect the test fixture ground strap to
any heatsink in this instrument.
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PW1A
General Soldering Guidelines Removal
1. Use a grounded-tip, low-wattage soldering iron and 1. Desolder and straighten each IC lead in one operation by
appropriate tip size and shape that will maintain tip gently prying up on the lead with the soldering iron tip as the
temperature within the range 500°F to 600°F. solder melts.
2. Use an appropriate gauge of resin-core solder composed of 2. Draw away the melted solder with an anti-static suction-type
60 parts tin/40 parts lead. solder removal device (or with solder braid) before removing
the IC.
3. Keep the soldering iron tip clean and well-tinned.
Replacement
4. Thoroughly clean the surfaces to be soldered. Use a small 1. Carefully insert the replacement IC in the circuit board.
wire-bristle (0.5 inch or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners. 2. Carefully bend each IC lead against the circuit foil pad and
solder it.
5. Use the following desoldering technique.
a. Allow the soldering iron tip to reach normal temperature 3. Clean the soldered areas with a small wire-bristle brush. (It is
(500°F to 600°F). not necessary to reapply acrylic coating to areas.)
b. Heat the component lead until the solder melts. Quickly "Small-signal" Discrete Transistor Removal/Replacement
draw away the melted solder with an anti-static, suction- 1. Remove the defective transistor by clipping its leads as close
type solder removal device or with solder braid. as possible to the component body.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil. 2. Bend into a "U" shape the end of each of the three leads
remaining on the circuit board.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach normal temperature 3. Bend into a "U" shape the replacement transistor leads.
(500°F to 600°F).
4. Connect the replacement transistor leads to the
b. First, hold the soldering iron tip and solder strand against corresponding leads extending from the circuit board and
the component lead until the solder melts. crimp the "U" with long nose pliers to insure metal to metal
contact, then solder each connection.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it Power Output Transistor Devices Removal/Replacements
there only until the solder flows onto and around both the 1. Heat and remove all solder from around the transistor leads.
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit 2. Remove the heatsink mounting screw (if so equipped).
board printed foil or components.
3. Carefully remove the transistor from the circuit board.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush. 4. Insert new transistor in circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heatsink.
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
Use Soldering Iron to Pry Leads
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
IC Removal/Replacement
Some Hitachi unitized chassis circuit boards have slotted holes 5. Inspect (on the circuit board copper side) the solder joints of
(oblong) through which the IC leads are inserted and then bent the two "original leads". If they are not shiny, reheat them and,
flat against the circuit foil. When holes are the slotted type, the if necessary, apply additional solder.
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.
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Fuses and Conventional Resistor Removal/Replacement At Other Connections
1. Clip each fuse or resistor lead at top of circuit board Use the following technique to repair defective copper pattern at
hollow stake. connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
2. Securely crimp leads of replacement component around stake board.
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.
DEFECTIVE
Circuit Board Foil Repair COPPER
Excessive heat applied to the copper foil of any printed circuit REMOVED
board will weaken the adhesive that bonds the foil to the circuit
board, causing the foil to separate from, or "lift-off," 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 Insulated Jumper Wire
voltage/current characteristics make the spacing and integrity of
copper pattern in some circuit board areas more critical than in 1. Remove the defective copper pattern with a sharp knife.
others. The circuit foil in these areas is designated as Critical Remove at least 1/4 inch of copper, to ensure hazardous
Copper Pattern. Because Critical Copper Pattern requires condition will not exist if the jumper wire opens.
special soldering techniques to ensure the maintenance of
reliability and safety standards, contact your Hitachi personnel. 2. Trace along the copper pattern from both wire sides of the
pattern break and locate the nearest component directly
At IC Connections connected to the affected copper pattern.
To repair defective copper pattern at IC connections, use the
following procedure to install a jumper wire on the copper pattern 3. Connect insulated 20-gauge jumper wire from the nearest
side of the circuit board. (Use this technique only on IC component on one side of the pattern break to the lead of the
connections.) nearest component on the other side.
1. Carefully remove the damaged copper pattern with a sharp Carefully crimp and solder the connections.
knife. (Remove only as much copper as absolutely CAUTION: Be sure the insulated jumper wire is dressed so
necessary.) that it does not touch components or sharp
edges.
2. Carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
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.
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NOTE: These components are affixed with glue. Be careful not to break or damage any foil under the
component or at the pins of the ICs when removing. Usually applying heat to the component for a short time
while twisting with tweezers will break the component loose.
Leadless Chip Components How to Replace Flat-lC
(surface mount) --Required Tools--
Chip components must be replaced with identical chips · Soldering iron · iron wire or small awl
due to critical foil track spacing. There are no holes in the · De-solder braids · Magnifier
board to mount standard transistors or diodes. Some chip 1. Remove the solder from all of the pins of a Flat-lC by
capacitor or resistor board solder pads may have holes using a de-solder braid.
through the board, however the hole diameter limits
Flat-IC
standard resistor replacement to 1/8 watt. Standard De-Solder
capacitors may also be limited for the same reason. It is Braid
recommended that identical chip components be used. .
Chip resistors have a three digit numerical resistance code Soldering
Iron
-1st and 2nd significant digits and a multiplier. Example:
162 = 1600 or 1.6K resistor, 0 = 0 (jumper). 2. Put the iron wire under the pins of the Flat-lC and pull
Chip capacitors generally do not have the value indicated it in the direction indicated while heating the pins using
on the capacitor. The color of the component indicates the a soldering iron. A small awl can be used instead of
general range of the capacitance. the iron wire.
Iron
Chip transistors are identified by a two letter code. The first Wire
letter indicates the type and the second letter, the grade of Awl
transistor.
Chip diodes have a two letter identification code as per the
code chart and are a dual diode pack with either Soldering
common anode or common cathode. Check the parts list Pull Soldering Iron
Iron
for correct diode number.
Component Removal 3. Remove the solder from all of the pads of the Fiat-
1. Use solder wick to remove solder from component end lC by using
a de-solder braid. Soldering
caps or terminals. Iron
2. Without pulling up, carefully twist the component with
tweezers to break the adhesive. De-Solder
3. Do not reuse removed leadless or chip components Braid
since they are subject to stress fracture during
removal . Flat-IC
Chip Component Installation
1. Put a small amount of solder on the board soldering 4. Position the new Flat-lC in place (apply the pins of the
pads. Flat-lC to the soldering pads where the pins need to be
2. Hold the chip component against the soldering pads soldered). Properly determine Polarity Symbol
the positions of the soldering
with tweezers or with a miniature alligator clip and pads and pins by correctly
apply heat to the pad area with a 30 watt iron until aligning the polarity symbol.
solder flows. Do not apply heat for more than 3
seconds
5. Solder all pins to the soldering pads using a fine tipped
Chip Components soldering iron.
TYPE
C GRADE SOLDER
CAPS
B
TRANSISTOR CAPACITOR Soldering
E Solder
Iron
1ST DIGIT
2ND DIGIT
COMMON CATHODE 6. Check with a magnifier for solder bridge between the
MULTIPLIER pins or for dry joint between pins and soldering pads. To
= 1600 = 1.6K remove a solder bridge, use a de-solder braid as shown in
the figure below.
ANODES SOLDER CAPS De-Solder
MH DIODE RESISTOR
Braid
Bridge Soldering
Solder Iron
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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.
Modifications
The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly
approved by Hitachi Home Electronics (America), Inc. may void the user's warranty.
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.
Declaration of Conformity
This device complies with Part 15 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.
For questions regarding this declaration, contact:
Hitachi America, LTD.
Home Electronics Division
900 Hitachi Way
Chula Vista, CA 91914
Tel. 1-800-448-2244 (1-800-HITACHI)
ATTN: CUSTOMER RELATIONS
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ACKNOWLEDGMENTS
AND TRADEMARKS
This Plasma Television complies with VESA DDC2B specifications, Plug & Play
is a system with computer, peripherals (including monitors) and operating
system. It works when the monitor is connected to a DDC ready computer that
is running an operating system software that is capable for the plug & play.
When a Plug and Play PC is powered on, it sends a command to the Monitor
requesting identification. The Monitor sends back a string of data including its
characteristics.
TRADEMARK ACKNOWLEDGMENT
DDCTM is a trademark of Video Electronics Standard Association.
IBM PC/AT and VGA are registered trademarkds of International Business Machines Corporation of the U.S.A.
Apple and Macintosh are registered trademarks of Apple Computer, Inc.
VESA is a trademark of a nonprofit organization, Video Electronics Standard Association.
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.
Cable Compatible Television Apparatus- Tèlèvision câblocompatible, Canada.
Notes on Closed Caption:
This Plasma Television receiver will display television closed captioning, ( or ), in accordance with
paragraph 15.119 of the FCC rules.
TruBass and the SRS ®
symbol are trademarks of SRS Labs, Inc. TruBass technology is incorporated under license
from SRS Labs, Inc.
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Plasma TV
Hitachi RS232C Communication Specification
This document defines the detailed RS232C control protocol for the following Hitachi Plasma
Televisions:
Model: 42EDT41A
CMP420V1A
CMP420V2A
The Information enclosed is subject to change without notice. Please refer to revision number
shown above when inquiring about product support.
1. Hardware Interface
1.1- The cable interface to the monitor is a 9 pin D-Sub type.
1.2- The gender of the 9 pin D-sub on the monitor is male. Therefore, the cable interface to
the monitor should be female.
1.3- The cable is configured in a null modem wiring scheme
1.4- A pin reference illustrations is provided below:
xy z { | Pin # Signal Remark
} ~ 1 NC
2 RXD0 PDP Control PC
3 TXD0 PDP Control PC
Figure. 1 (a) Male 9 pin D-sub 4 NC
(Outside View) 5 GND PDP PC GND
6 NC
7 NC
8 NC
| { zy x 9 NC
~ } Frame GND
Figure. 1 (b) Female 9 pin D-Sub
(Outside View)
1.5- Electric: Electrical specification is based on the current RS232C standard.
2. Communication Format
2.1- Port Configuration
(1) Communications System: Asynchronous
(2) Bit Rate: 9600 bps
(3) Data Length: 7 bit
(4) Parity: None
(5) Start Bit: None
(6) Stop Bit: 1 bit
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Plasma TV
2.2- Data Format
(1) Terminal Mode control format (Turning on and Off Terminal Mode)
- Terminal On is achieved by sending a 1 byte command of 05 (Hex).
- Terminal Off is achieved by sending a 1 byte command of 04 (Hex)
ON
/
Off
Figure. 2
(2) Terminal Communication Format (Sending Commands to TV)
- Commands are sent to the TV in 14 byte strings
- The strings consist of the following:
Start: 1 byte (02) Hex (STX)
Command: 12 byte
Stop: 1 Byte (03) Hex (ETX)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Start Stop
STX Function Read/Write Function Function Upper Data Lower Data ETX
(1 Byte) (2 Byte) (2 Byte) (2 Byte) (2 Byte) (2 Byte) (2 Byte) (1 Byte)
Figure. 3 Function (2 Byte) Function (2 Byte)
Function (2 Byte)
(3) Television Answer Format (Showing current Status)
- The television responds with a 6 byte answer strings as follows:
Start: 1 byte (02) Hex (STX)
Response: 4 byte (Upper Data/Lower Data)
Stop: 1 Byte (03) Hex (ETX)
1 2 3 4 5 6
Start Stop
STX Upper Data Lower Data ETX
(1 Byte) (2 Byte) (2 Byte) (1 Byte)
Figure. 4
(4) Television Answer Format (Status of Command Execution)
- Acknowledgement: (06) Hex (ACK)
- No Acknowledgement: (15) Hex (NAK)
ACK
/
NAK
Figure. 5
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3. Communication Protocol
3.1- Terminal Mode (Communication between television and external PC)
- When the RS232C mode is set from Off to On by the television OSD menu and
the TXD2 and RXD2 serial communication lines are switched to AV control, the
television can communicate with and external PC.
Set Up M
Set AV Control M
M
If you want to use AV control
Function, please set the RS232C.
Connected RS232C
L
Move
M SEL Select
Table 3.2.1 Terminal Mode Control
Terminal Mode Switching Plasma Television
Command sent to PDP Response from PDP
Action Request On Accept / Reject
ON Character ENQ ACK/NAK
Code (Hex) 05 06/15
Action Request OFF Accept / Reject
OFF Character EOT ACK/NAK
Code (Hex) 04 06/15
(1) External PC can turn terminal mode On and Off.
(2) Communication is prohibited when terminal mode is Off.
(3) When terminal mode is on, Front Keys and Remote do not operate. The only button that will
operate is main power.
(4) When TV set is turned Off and On, terminal mode remains in its current state
(5) Factory Setting: Terminal Mode is Off and AV Control Mode is Off.
(6) The television will always respond when an attempt to turn terminal mode on or off is made
with either an ACK or a NAK.
(7) In the following cases, even if the check box of menu is checked, Terminal mode cannot be
turned on.
- Adjust mode
- While Event Timer and Timer Recording
- While Auto CH scan operates
- While upgrade operates
(8) Write function in terminal mode will write data to the EEPROM in the same manner as when
unit is operated in Normal Mode through the OSD.
(9) For OSD functionality in terminal mode, see table 5.
(10) When the Life extension mode is active, the unit will not accept changes in the contrast
control.
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3.2- Command Summary (Sending and Receiving Data)
3.2.1- Data received by Television
· TV will accept data from the PC when it is properly formatted as shown in table 3.2.1.1 only
when the Terminal Mode is ON.
· The command length is 12 bytes with a start and stop byte. Therefore total command strings
are 14 bytes
st th
· The command consists of 6 Hex codes from 1 to 6 as shown below. (Total 12 bytes)
· All command strings should be described in character code and then converted to Hex Code.
· Table 3.2.1.2 shows the 3 types of command formats
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· All commands are classified into these 3 types of command by the 1 and 2 command byte.
Table 3.2.1.1 Communication format received by Television
Start Stop
Received byte # 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Contents Start 1st 2nd 3rd 4th 5th 6th Stop
Of Function R/W Upper byte Lower byte Upper byte Lower byte
Commands (Function) (Function) (Data) (Data)
Character -Hex STX 0~F 0~F 0~F 0~F 0~F 0~F 0~F 0~F 0~F 0~F 0~F 0~F ETX
Code- Hex 02 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 03
*1 Character Code: "0"-"9" 30-39, "A" "F" 41-46
Note- See code conversion examples in section 4 for conversion details.
Table 3.2.1.2 Format of Commands Received by Television (12 bytes)
Command (12 byte)
Form No. Action
1st 2nd 3rd 4th 5th 6th
Reset
(a) Command Dummy Dummy Dummy Dummy Dummy
Write/Read
(**) (00) (00) (00) (00) (00)
(b) Read Data Command Operation Command Command Dummy Dummy
(**) (**) (**) (**) (00) (00)
(c) Write Data Command Operation Command Command Data Data
(**) (**) (**) (**) (**) (**)
3.2.2 Format of commands sent from television to PC
· Upon completion of a command sent to the television as shown in table 3.2.1.2, The
television will respond with an answer as shown in table 3.2.2.
· In the event that a command is rejected by the television, an Hex 15 will be sent to the PC.
Table 3.2.2 Answer format from television to PC
Communication When requesting read data only from the TV
Normal/Error To the PC, the following format applies
Sent byte No. 1 1 2 3 4 5 6
Contents of the Accepted or Data Data
Start Stop
command Rejected Upper byte Lower byte
Character (Hex) ACK/NAK STX 0~F 0~F 0~F 0~F ETX
Code (Hex) 06/15 02 *1 *1 03
*1 Character Code: Example "0"-"9" "30"-"39" , "A-F 41- 46
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3.3 Command Table
st
3.3.1- 1 sub command (for function) table
st
Table 3.3.1 1 Sub Command and Adjustment Table
No. Setting Command Command
Function 1st R/W 3rd/4th OSD E2PROM Format
Hex Control Hex (*1)
1 POWER 6E R/W 0000 Info Write (c)
2 INPUT 6F R/W 0000 Info Write (c)
3 Volume 27 R/W 0000 Volume Bar (c)
4 Balance 28 R/W 0000 No OSD (c)
5 Treble 2B R/W 0000 No OSD (c)
6 Bass 2A R/W 0000 No OSD (c)
(TV Mode)
7 Audio Mute 29 R/W 0000 No OSD (c)
8 Picture Mode A4 R/W 0003 Day/Night (c)
9 Contrast 59 R/W 0000 No OSD (c)
10 Brightness 1F R/W 0000 No OSD (c)
11 Color 10 R/W 0000 No OSD (c)
12 Tint 13 R/W 0000 No OSD (c)
13 Sharpness 14 R/W 0000 No OSD (c)
14 Color 60 R/W 0000 No OSD (c)
Temperature
15 Aspect 40 R/W 0000 Aspect (c)
(Info OSD)
16 INFO B2 W 0000 Info (c)
17 Direct CH 0~9 D0 W 0000 CH No. Write (c)
18 Direct CH - D0 W 0001 CH No. Write (c)
19 Direct CH D0 W 0002 CH No. Write (c)
Select
20 Auto Movie D4 R/W 0000 No OSD (c)
Mode
(RGB Mode)
21 Contrast 59 R/W 0000 No OSD (c)
22 Brightness 1F R/W 0000 No OSD (c)
23 Color 60 R/W 0000 No OSD (c)
Temperature
24 Aspect 40 R/W 0000 Aspect (c)
(Info OSD)
nd
3.3.2 2 sub command (Read / Write) table
R : d Only. 01 Hex can be accepted. Data (absolute value) will be read from the TV.
Rea
W : Write Only. 00(Hex) can be accepted. Data (absolute value) will be written to TV
R/W : Read and Write. Both 00 and 01 (Hex) can be accepted
When 01 (Hex) is sent to TV, the data (Absolute Value) will be read from TV
When 00 (Hex) is sent to T V, the data (absolute value will be written to TV
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3.3.3 5 and 6 Data Command Table
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The table below shows the specification for the 5 and 6 data bytes.
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Table 3.3.3 Specification for 5 and 6 data bytes in normal command
Transfer Data (Hex)
No. Note
5th 6th
1 Dummy Data Dummy Data
2 Dummy Data Transfer Data (1 byte)
3 Transfer Data Transfer Data
(upper 1 byte) (lower 1 byte)
Note- Any data that is transferred as Dummy data will be ignored by both the PC and the TV
3.3.4 Setting Items (Data Range of Commands)
Table 3.3.4 (Setting Item List)
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Setting Item 5 /6 Initial Comments
No. Data Range Setting
1 Power 0: Off 0
1: On
2 Input 0: Input 1 -
1: Input 2
2: Input 3
3: Input 4
4: Input 5
6: Ant. A
7: Ant. B
9: Photo Input
3 Volume 0~63 Step 20
4 Balance 0~20 Step 10
5 Treble 0~20 Step 10
6 Bass 0~20 Step 10
7 Audio Mute 0: Off 0
1: On
2: Soft Mute
8 Picture Mode 0: Day 0
1: Night
9 Contrast 0~68 Step -
10 Brightness 0~60 Step -
11 Color 0~60 Step -
12 Tint 0~60 Step -
13 Sharpness 0~60 Step -
14 Color Temperature 0: High -
1: Medium
2: Standard
3: Black &
White
15 Aspect 0: 16:9 Std. -
1: 16:9 Zoom
2: 4:3 Std
3: 4:3 Expand
4: 4:3 Zoom
5: 4:3 Zoom 2
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No. Setting Item 5 /6 Initial Comments
Data Range Setting
16 Info 0: Off 0
1: On
17 Direct CH 0~9 Key Code -
0~9-0~9
18 Direct Channel (-) 0 -
19 Direct Channel Select 0 -
20 Auto Movie Mode 0: Off 0
1: On (Auto)
(RGB Mode)
21 Contrast 0~68 Step -
22 Brightness