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YK No.006E-1
55PMA550
SERVICE MANUAL 55HDM71
(PW1)
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. Features --------------------------------------------------3 8. Basic circuit diagram--------------------------------- 35
2. Specifications--------------------------------------------4 9. Printed wiring board diagram ---------------------- 42
3. Service point s -------------------------------------------5 10.Block diagram ----------------------------------------- 47
4. Component names -------------------------------------6 11.Connection diagram --------------------------------- 49
5. New Technology ----------------------------------------7 12.Wiring diagram -----------------------------------------50
6. Service Modes ---------------------------------------- 10 13.Disassembly diagram-------------------------------- 52
7. Troubleshooting --------------------------------------- 29 14.Replacement parts list------------------------------- 55
15.DC Voltage Tables --------------------------------- 66
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
Plasma Display
July 2004 Digital Media Division
55PMA550/55HDM71 (PW1)
CAUTION FOR SAFETY
Please read this page before making repairs to the monitor.
This page explains certain safety items found in this manual which are intended to ensure the
safety of the technician and to prevent accidents during any repair work.
Warning This symbol means "Personnel Electrical Safety Hazard"
Caution This symbol means "Equipment Operational Hazard"
This symbol means "CAUTION" This symbol means "DO IT!"
This symbol means "POSSIBILITY OF
This symbol means "DON'T DO IT!"
ELECTRIC SHOCK"
WARNING
Special Instructions Keep the same wiring dress for boards.
This indicates cabinet, chassis or parts This monitor uses insulated spacers
which require special attention. which are intended to isolate metal
Please follow any notes as well as all safety parts from electrical components.
precautions.
Prevent electrical shock Internal wiring is isolated from components by
Please use care and caution when using clamps, retainers, etc., so please return
servicing this product. High voltages to original condition for prevention of electrical
exist in the set which can cause injury shock or fire.
or death. Safety check should be done after finished.
Every part (removed screws, component
Please disconnect the AC power and wiring) should be returned to previous
during repair to prevent serious shock condition.
or death. Check around the repaired area for
any damage by mistake. Measure the
Use only recommended components. insulated impedance of AC by ohm meter.
Please use the same characteristic compo- Confirm that the value of impedance
nents, which is same as previous for your is greater than 4M ohm.
safety. To ensure reliability, specially marked It is possible for electric shock or fire to
parts ( ) should be OEM when replaced. occur if the value is less than 4M ohm.
These parts are also safety related, so Repair to the HDCP circuit is limited.
electrical shock and/or fire could result
from using generic parts. Never remove the shield case, which is
assembled to code with the HDCP circuit
2
55PMA550/55HDM71 (PW1)
PRECAUTIONS
How to clean the plasma panel screen (front glass) of the monitor -
Before cleaning the monitor, turn off the monitor and disconnect the power plug from the power outlet.
To prevent scratching or damaging the plasma screen face, do not wipe the surface with sharp or hard
objects. Clean the screen with a soft cloth moistened with warm water and dry with a soft cloth. If it is not
clean enough, then use a cloth with glass cleaner. Do not use any harsh or abrasive chemicals.
How to clean the cabinet of the monitor
Use a soft cloth to clean the cabinet and control panel of the monitor. When excessively soiled dilute a neutral
detergent in water, wet and wring out the soft cloth and afterward wipe with a dry soft cloth.
Never use acid/alkaline detergent, alcoholic detergent, abrasive cleaner, powder soap, OA cleaner, car wax,
etc. because they could cause discoloration, scratches or cracks.
1. Features
Large-screen, high-definition plasma display panel
The 55-inch color plasma display panel, with a resolution of 1366 (H) x 768(V) pixels, creates a high-definition, large-
screen (aspect ratio : 16:9) and low-profile flat display. Free from electromagnetic interferences from geomagnetic
sources and ambient power lines, the panel produces high-quality images free from any color misconvergence
or corner focus distortion.
High Performance Digital Processor
A wide range of personal computer signals can be handled, from 640 x 400, 640 x 480 VGA to 1600 x 1200 UXGA.
(RGB analog input)
Easy-to-use remote control and on-screen-display system (OSD)
The remote control included eases the setting of display controls. Furthermore, the on-screen-display (OSD),
displays the input status control settings in an easy-to-view fashion.
Power saving system
The International ENERGY STAR power saver feature saves power consumption automatically when input sig-
nals are not available.
When connected to a VESA DPMS-compliant PC, the monitor cuts its power consumption while it is idle.
TruBass
TruBass, SRS and ( ) symbol are trademarks of SRS Labs,Inc.
TruBass technology is incorporated under license from SRS Labs, Inc.
One mini D-sub terminal and one DVI-D terminal for RGB input.
The D-sub terminal can also receive the RGB-component by On-Screen Display control.
One composite/S.video input terminal and two component video input terminals added with VIDEO board.
One component input is possible to switch to RGB signal input from the Menu screen.
One SCART terminal for the signal of the European standard added with VIDEO board.
It operates as composite/S.video input and RGB input terminal, or composite video output terminal.
One composite video output terminal as a monitoring output added with VIDEO board.
3
55PMA550/55HDM71 (PW1)
2. Specifications
55PMA550 55HDM71
Display
Approx. 55 inches (1229 (H) x 691 (V) mm, diagonal 1410mm)
Panel dimensions
Resolution 1366 (H) x 768 (V) pixels
Net dimensions
1394 (W) x 857 (H) x 105 (D) mm
(excluding Speakers/Stand)
Net weight
63.5kg 64.2kg
(excluding Speakers/Stand)
Temperature o o o o
Ambient Operating : 5 C to 35 C, Storage : 0 C to 40 C
conditions Relative humidity Operating : 20% to 80%, Storage : 20% to 90% (non-condensing)
Power supply AC100 - 240V, 50/60Hz
Power consumption/at standby 530W / <3W
Audio output 12W + 12W (6 ohm load), sub woofer terminal (RCA)
(RGB input)
RGB1 DVI input terminal (DVI-D)
RGB1 audio input terminal (3.5mm Stereo Mini Jack)
Input terminals
RGB2 analog RGB input terminal (D-sub 15-pin)
RGB2 audio input terminal (3.5mm Stereo Mini Jack)
Input signals 0.7 V/1.0 Vp-p, analog RGB (Recommended Signal)
Video signals
480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60
H/V composite, TTL level (2K )
Sync signals H/V separate, TTL level (2K )
Sync on green, 0.3 Vp-p (75 )
Recommended signal 47 modes
(Video input)
AV1: composite video input terminal (RCA)
AV1: Y PB PR video input terminal (RCA)
AV1: L/R audio input terminal (RCA)
AV2: composite video input terminal (RCA)
AV2: Y/G PB/B PR/R video input terminal (RCA)
Input terminals
AV2: L/R audio input terminal (RCA)
AV3: composite video input terminal (RCA)
AV3: S video input terminal (RCA)
Input signals AV3: L/R audio input terminal (RCA)
AV4: composite video / S video / RGB / L/R audio input terminal (Scart)
AV1: PAL, SECAM, NTSC3.58, NTSC4.43 AV1: NTSC-M, PAL-M, PAL-N
AV1: 480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60
AV2: PAL, SECAM, NTSC3.58, NTSC4.43 AV2: NTSC-M, PAL-M, PAL-N
Video signals AV2: 480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60, RGB
AV3: PAL, SECAM, NTSC3.58, NTSC4.43 AV3: NTSC-M, PAL-M, PAL-N
AV4: PAL, SECAM, NTSC3.58, NTSC4.43 AV4: NTSC-M, PAL-M, PAL-N
AV4: RGB
OUTPUT (MONITOR): composite video monitor-output terminal (RCA)
Video output Signal OUTPUT (MONITOR): L/R audio monitor- output terminal (RCA)
AV4: composite video / L/R audio monitor-output terminal (SCART)
Recommended signal 15 modes 13 modes
The monitor takes at least 30 minutes to attain the status of optimal picture quality.
Applicable video signals for each input terminal
Terminal RCA/SCART DVI D-sub
Signal CVBS S-video Component RGB PC STB RGB Component
AV1
AV2
AV3
AV4
RGB1
RGB2
( :Available)
4
55PMA550/55HDM71 (PW1)
3. Service points
Lead free solder
This product uses lead free solder (unleaded) to help preserve the environment. Please read these instructions
before attempting any soldering work.
Caution: Always wear safety glasses to prevent fumes or molten solder from getting into the eyes. Lead free
solder can splatter at high temperatures (600