Hitachi CMP420V1 User manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
Plasma Display
August 2004 Digital Media Division
YK No.009E-1
SERVICE MANUAL
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 displayservice manual.
Be sure to read all cautionary items described in the manual to maintain safety before servicing.
Contents
1. Since the Panel Module and front Filter are made of glass, handlea 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.
Service Warning
Caution
1. Features ----------------------------------------------- 3
2. Specifications----------------------------------------- 4
3. Component Names --------------------------------- 5
4. Service point ------------------------------------------ 6
5. Service Modes -------------------------------------7
6. Troubleshooting------------------------------------34
7. Block Diagram ------------------------------------37

2
CMP420V1/CMP420V2/42EDT41 (PW1A)
CAUTION FOR SAFETY
Please read this page before making repairs to themonitor.
This page explainscertain 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 "POSSIBILITY OF
ELECTRIC SHOCK"
This symbol means "DO IT!"
This symbol means "DON'TDO IT!"
Special Instructions
This indicates cabinet, chassis or parts
which require special attention.
Please follow any notesas well as all safety
precautions.
Prevent electrical shock
Please use care and caution when
servicing this product. High voltages
exist in the set which can cause injury
or death.
Please disconnect the AC power
during repair to prevent serious shock
or death.
Use only recommended components.
Please use the same characteristic compo-
nents, which is same as previous for your
safety. To ensure reliability,specially marked
Keep the same wiring dress for boards.
This monitor uses insulated spacers
which are intended to isolate metal
parts from electrical components.
Internal wiring is isolated from components by
using clamps, retainers, etc., so please return
to original condition for prevention of electrical
shock or fire.
Safety check should be done after finished.
Every part (removed screws, component
and wiring) should be returned to previous
condition.
Check around the repaired area for
any damage by mistake. Measure the
insulated impedance of AC by ohm meter.
Confirm that the value of impedance
is greater than 4M ohm.
It is possible for electric shock or fire to
occur if the value is less than 4M ohm.
Repair to the HDCP circuit is limited.
Never remove the shield case, which is
assembled to code with the HDCP circuit
WARNING

3
CMP420V1/CMP420V2/42EDT41 (PW1A)
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 42-inch color plasma display panel, with a resolution of 852 (H) x 480(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 medium-quality images free from any color misconvergence
or corner focus distortion.
●High Performance Digital Processor
Awide 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.

4
CMP420V1/CMP420V2/42EDT41 (PW1A)
2. Specifications
Panel
Display
dimensions Approx. 42 inches (920 (H) x 518 (V) mm, diagonal 1059mm)
Resolution 852 (H) x 480 (V) pixels
Net dimensions
(excluding Speakers/Stand) 1030 (W) x 636 (H) x 91 (D) mm
Net weight
(excluding Speakers/Stand) CMP420V1/V2:33.2kg 42EDT41:34.2kg
Ambient
conditions
Temperature
Relative humidity Operating : 20% to 80%, Storage : 20% to 90% (non-condensing)
Power supply AC100 - 240V, 50/60Hz
Power consumption/at standby 310W / <3W
Audio output
(RGB input)
Input signals
Input terminals
RGB1 DVI input terminal (DVI-D)
RGB1 audio input terminal (3.5mm Stereo Mini Jack)
RGB2 analog RGB input terminal (D-sub 15-pin)
RGB2 audio input terminal (3.5mm Stereo Mini Jack)
Video signals 0.7 V/1.0 Vp-p, analog RGB (Recommended Signal)
480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60
Sync signals
H/V separate, TTL level [2K ]
H/V composite, TTL level [2K ]
Sync on green, 0.3 Vp-p [75 ]
(Video input)
(RF input)
Input signals
Input signals
Input terminals
Input terminals
RF Video System
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)
AV2: L/R audio input terminal (RCA)
AV3: composite video input terminal (RCA)
AV3: S video input terminal (RCA)
AV3: L/R audio input terminal (RCA)
AV4: composite video / S video / RGB / L/R audio input terminal (Scart)
Video signals
AV1: NTSC-M, PAL-M, PAL-N
AV1: 480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60
AV2: NTSC-M, PAL-M, PAL-N
AV2: 480i, 576i, 480p, 576p, 1080i/50, 1080i/60, 720p/60, RGB
AV3: NTSC-M, PAL-M, PAL-N
AV4: NTSC-M, PAL-M, PAL-N
NTSC-M
AV4: RGB
Video output Signal
OUTPUT (MONITOR): composite video monitor-output terminal (RCA)
OUTPUT (MONITOR): L/R audio monitor- output terminal (RCA)
AV4: composite video / L/R audio monitor-output terminal (SCART)
Operating : 5to 35, Storage : -15to 60
12W + 12W (6ǡ)
ANT : 75 unbalanced
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)

5
CMP420V1/CMP420V2/42EDT41 (PW1A)
3. Component names
Remote-control
receiver
• Adjustment buttons are located
on the bottom.
• The back cover is provided with
indications to distinguish the
adjustment buttons.
Control panel
Main power switch
• The main power switch is located at the back, on the
lower surface.
Indicating lamp
for
CMP420V1
CMP420V2 for
42EDT41
[Remote control]
[Main unit]

6
CMP420V1/CMP420V2/42EDT41 (PW1A)
4. 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˚C).
Lead free solder indicator
Printed circuit boards using lead free solder are engraved with an "F."
Properties of lead free solder
The melting point of lead free solder is 40-50˚C higher than leaded solder.
Servicing solder
Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended.
Although servicing with leaded solder is possible, there are a few precautions that have to be taken. (Not
taking these precautions may cause the solder to not harden properly, and lead to consequent malfunctions.)
Precautions when using leaded solder
Remove all lead free solder from soldered joints when replacing components.
If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the
lead free solder has been completely melted (do not apply the soldering iron without solder).
Servicing soldering iron
A soldering iron with a temperature setting capability (temperature control function) is recommended.
The melting point of lead free solder is higher than leaded solder. Use a soldering iron that maintains a high
stable temperature (large heat capacity), and that allows temperature adjustment according to the part being
serviced, to avoid poor servicing performance.
Recommended soldering iron:
Soldering iron with temperature control function (temperature range: 320-450˚C)
Recommended temperature range per part:
Part Soldering iron temperature
Mounting (chips) on mounted PCB 320˚C±30˚C
Mounting (chips) on empty PCB 380˚C±30˚C
Chassis, metallic shield, etc. 420˚C±30˚C
(1) FILTER PWB, SW PWB, LED/RECEIVER PWB, TACT SW PWB, SP TERMINAL(L/R) PWB
(2) AUDIO PWB, JOINT PWB
(3) VIDEO PWB
(4) FORMATTER PWB
(5) POWER BOARD
The PWB assembly which has used lead free solder

CMP420V1 / CMP420V2 / 42EDT41 (PW1A)
5. SERVICE MODE ACCESS
BURN-IN MODE
BURN-IN MODE
When the Burn-in feature is turned ON, the plasma panel operates normally on all inputs that
have a signal. On inputs that do not have a signal, the plasma panel displays a cycling single
color test pattern (see below) which is generated internally. This can be helpful to determine
if the panel is capable of displaying anything.
NOTE:
1st number indicates normal button operation
2nd number indicates function during MENU
Rear Label
7654321
- + OK
2. VOL
2. ADJ
1. SUB POWER
3. VOL
3. ADJ
4. PROGRAM
4.SELECT
5. PROGRAM
5.SELECT
6. INPUT SELECT
6. OK
7. MENU
126
BURN-IN MODE (ON)
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold the
buttons down until the initial OSD goes
away. OSD will then appear indicating that
BURN-IN MODE is engaged.
(OSD > Burn In On)
1 2
BURN-IN MODE (OFF)
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold the
buttons down until the initial OSD goes
away. OSD will then appear indicating that
BURN-IN MODE is disengaged.
(OSD > Burn In Off)
White Yellow Cyan Green Magenta Red Blue Black
7

CMP420V1 / CMP420V2 / 42EDT41 (PW1A)
DEMO MODE
When the DEMO feature is turned ON, both the remote and the plasma panel front panel
buttons (with the exception of the SUB POWER button) are non-operational. This can be
useful for the Sales / Dealers to prevent anyone from playing with any of the settings.
NOTE: This is the front panel shortcut to parameter #175 in the I2C ADJUSTMENT MODE.
NOTE:
1st number indicates normal button operation
2nd number indicates function during MENU
Rear Label
7654321
- + OK
2. VOL
2. ADJ
1. SUB POWER
3. VOL
3. ADJ
4. PROGRAM
4.SELECT
5. PROGRAM
5.SELECT
6. INPUT SELECT
6. OK
7. MENU
DEMO MODE (OFF)
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold
the buttons down until the initial OSD goes
away. DEMO MODE is now disengaged,
although you will not see any OSD confir-
mation.
1 3
DEMO MODE (ON)
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold the
buttons down until the initial OSD goes
away. DEMO MODE is now engaged, al-
though you will not see any OSD confirma-
tion.
136
8
SERVICE MODE ACCESS
DEMO MODE

CMP420V1 / CMP420V2 / 42EDT41 (PW1A)
I2C ADJUSTMENT MODE
When the set is in the I2C Adjustment mode, use the cursor buttons for selecting the
adjustment parameter, and for changing the parameter’s value. Use the OK button to
confirm. After adjustments are complete, press the MENU button to return the set to normal
operating condition.
NOTE:
1st number indicates normal button operation
2nd number indicates function during MENU
Rear Label
7654321
- + OK
2. VOL
2. ADJ
1. SUB POWER
3. VOL
3. ADJ
4. PROGRAM
4.SELECT
5. PROGRAM
5.SELECT
6. INPUT SELECT
6. OK
7. MENU
I2C Adjustment Mode
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold the
buttons down until the initial OSD goes
away. OSD will then appear indicating that
I2C ADJUSTMENT MODE is engaged.
9
146
MEMORY INITIALIZATION
Don’t indiscriminately perform this procedure as it can result in a loss of data if the old val-
ues were not recorded.
1. Engage I2C Adjustment mode.
2. Select parameter #744. Change the data value from “0” to “1”.
3. Activate MEMORY INITIALIZATION by holding down the OK button for at least
three seconds.
4. Select parameter #374. Change the data value from “1” to “0”.
5. Check that the set changes input to AV1, indicating that the preset values have been
loaded.
SERVICE MODE ACCESS
I2C ADJUSTMENT MODE

CMP420V1 / CMP420V2 / 42EDT41 (PW1A)
FACTORY RESET
Occasionally, it becomes necessary to perform a factory reset. This is different than the
Memory Initialization, only customer settings are affected by Factory Reset.
NOTE:
1st number indicates normal button operation
2nd number indicates function during MENU
Rear Label
7654321
- + OK
2. VOL
2. ADJ
1. SUB POWER
3. VOL
3. ADJ
4. PROGRAM
4.SELECT
5. PROGRAM
5.SELECT
6. INPUT SELECT
6. OK
7. MENU
Factory Reset
With unit in standby mode
(turned off), press and hold: >
After the unit comes on, continue to hold the
buttons down until the initial OSD goes
away. Factory Reset has now engaged,
although you will not see any OSD confir-
mation.
10
156
SERVICE MODE ACCESS
FACTORY RESET