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PA No. 0174
32HDT50/55: PT3-E Chassis
42HDT50/55: PT3-G Chassis
AVC50: AVC3-U Chassis
SERVICE MANUAL
P T 3 - E / G AV C 3 - U R/C: CLU-5726TSI (32/42HDT50/55)
NTSC
Chassis R/C: CLU-120S (32/42HDT55)
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
AGENCY REGULATORY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
ACKNOWLEDGMENTS AND TRADEMARKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
BASIC SETUP & OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
TROUBLESHOOTING FLOWCHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
DC VOLTAGE TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
CIRCUIT SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
PRINTED CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
EXPLODED VIEW DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
QUICK REFERENCE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
DVI CABLE PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
CAUTION: These servicing instructions are for use by qualified 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 qualified 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 identified by a ! on the schematics and on the parts list in this
Service Data and its supplements 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
PLASMA DISPLAY PANEL
APRIL 2003 HHEA-MANUFACTURING DIVISION
PT3-E/G AVC3-U
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
short circuit has occurred, replace those components that LEAKAGE BE ABOVE 0.5MIU)
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.
2
TABLE OF CONTENTS
PT3-E/G AVC3-U
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
AVC50 - Audio Video Control Unit stress to the module (glass-panel).
1. Follow the general caution recommendations from "Safety WARNING
precautions" section. Lead in solder used in this product is listed by the California
Health and Welfare agency as a known reproductive toxicant
32HDT50M/55M - Plasma Monitor Unit which may cause birth defects or other reproductive harm
42HDT50M/55M - Plasma Monitor Unit (California Health and Safety Code, Section 25249.5).
1. Follow the general caution recommendations from "Safety When servicing or handling circuit boards and other components
precautions" section. which contain lead in solder, avoid unprotected skin contact with
2. Since the Panel module and front filter are made of glass, solder. Also, when soldering make sure you are in a well
sufficient care shall be taken when handling the broken ventilated area in order to avoid inhalation of any smoke or
module and filter in order to avoid injury. fumes released.
3. If necessary to replace Panel module, this work must be
started after the panel module and the AC/DC Power supply SAFETY NOTICE
becomes sufficiently cool. USE ISOLATION TRANSFORMER
4. Special care must be taken with the display area to avoid WHEN SERVICING
damaging its surface.
5. The Panel Module shall not be touched with bare hands to POWER SOURCE
protect its surface from stains.
6. It is recommended to use clean soft gloves during the This television receiver is designed to operate on 120
replacing work of the Panel module in order to protect, not Volts/60Hz, AC house current. Insert the power cord into a 120
only the display area of the panel module but also the Volts/60Hz outlet.
serviceman.
7. The Chip Tube of the panel module (located upper left of the NEVER CONNECT THE TV TO OTHER THAN THE
back of the panel module) and flexible cables connecting SPECIFIED VOLTAGE OR TO DIRECT CURRENT.
Panel glasses to the drive circuitry Printed Wiring Boards
(P.W.B.) are very weak, so sufficient care must be taken to
prevent breaking or cutting any of these. If the Chip Tube
breaks the panel module will never work, replacement for a
new plasma panel module will be needed.
8. Signal, power supply P.W.B.'s and PDP driving circuits
P.W.B.'s are assembled on the rear side of the PDP module,
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.
3
TABLE OF CONTENTS
PT3-E/G AVC3-U
SERVICING PRECAUTIONS
CAUTION: Before servicing instruments covered by this Electrostatically Sensitive (ES) Devices
service data and its supplements and addenda, read and Some semiconductor (solid state) devices can be damaged
follow the "Important Safety Instructions" on page 3 of this easily by static electricity. Such components commonly are
publication. called Electrostatically Sensitive (ES) Devices. Examples of
NOTE: If unforeseen circumstances create conflict between typical ES devices are integrated circuits and some field-
the following servicing precautions and any of the safety effect transistors and semiconductor "chip" components. The
precautions on page 3 of this publication, always follow the following techniques should be used to help reduce the
safety precautions. Remember: Safety First. incidence of component damage caused by static electricity.
General Servicing Guidelines 1. Immediately before handling any semiconductor
1. Always unplug the instrument AC power cord from the AC component or semiconductor-equipped assembly, drain
power source before: off any electrostatic charge on your body by touching a
a. Removing or reinstalling any component, circuit known earth ground. Alternatively, obtain and wear a
board, module, or any other instrument assembly. commercially available discharging wrist strap device,
which should be removed for potential shock reasons
b. Disconnecting or reconnecting any instrument prior to applying power to the unit under test.
electrical plug or other electrical connection.
2. After removing an electrical assembly equipped with ES
c. Connecting a test substitute in parallel with an devices, place the assembly on a conductive surface
electrolytic capacitor in the instrument. such as aluminum foil, to prevent electrostatic charge
buildup or exposure of the assembly.
CAUTION: A wrong part substitution or incorrect
polarity installation of electrolytic 3. Use only a grounded-tip soldering iron to solder or
capacitors may result in an explosion desolder ES devices.
hazard.
4. Use only an anti-static type solder removal device. Some
2. Do not spray chemicals on or near this instrument or any solder removal devices not classified as "anti-static" can
of its assemblies. generate electrical charges sufficient to damage ES
device.
3. Unless specified otherwise in these service data, clean
electrical contacts by applying the following mixture to the 5. Do not use freon-propelled chemicals. These can
contacts with a pipe cleaner, cotton-tipped stick or generate electrical charges sufficient to damage ES
comparable nonabrasive applicator: 10% (by volume) devices.
Acetone and 90% (by volume) isopropyl alcohol (90%-
99% strength). 6. Do not remove a replacement ES device from its
CAUTION: This is a flammable mixture. Unless protective package until immediately before you are
specified otherwise in these service data, ready to install it. (Most replacement ES devices are
lubrication of contacts is not required. packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive
4. Do not defeat any plug/socket of voltage interlocks with material.)
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
5. Do not apply AC power to this instrument and/or any of its protective material to the chassis or circuit assembly into
electrical assemblies unless all solid-state device heat- which the device will be installed.
sinks are correctly installed. CAUTION: Be sure no power is applied to the chassis or
circuit, and observe all other safety
6. Always connect the test instrument ground lead to the precautions.
appropriate instrument chassis ground before connecting
the test instrument positive lead. Always remove the test 8. Minimize bodily motions when handling unpackaged
instrument ground lead last. replacement ES devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the
7. Use with this instrument only the test fixtures specified in lifting of your foot from a carpeted floor can generate
this service data. static electricity sufficient to damage an ES device.)
CAUTION: Do not connect the test fixture ground strap
to any heatsink in this instrument.
4
TABLE OF CONTENTS
PT3-E/G AVC3-U
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
temperature within the range 500