Hitachi 42HDF52 - 42" Plasma TV User manual

No.
HITACHI
SERVICE MANUAL
42HDF52
Be sure to read this manual before servicing. To ensure safety from fire, electric shock, injury, harmful
radiation and materials, various measures are provided in this Plasma Monitor.
Be sure to read cautionary items described in the manual before servicing.
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 described in the operating instructions unless you are
qualified to do so.
1. Since the Panel Module and the front Filter are made of glass, handling the broken Module and Filter
carefully and with caution in order not to receive injury.
2. Replacement work should be started after the Panel Module and the AC/DC Power supply have
become sufficiently cool.
3. Special care should be taken when working near the display area in order not to damage its surface.
4. The Panel Module should not be touched with bare hands in order to protect its surface from
blemishes and damage.
5. It is recommended that you use clean soft gloves during the replacement work in order to protect not
only the display area of the Panel Module but also yourself.
1. Features -------------------------------------------3
2. Specifications ------------------------------------4
3. Component Names -----------------------------5
4. Service points ------------------------------------7
5. Adjustment
Caution
----------------------------------------8
6. Troubleshooting --------------------------------10
7. Blockdiagram ---------------------------------- 23
8. Connection diagram ----------------------------26
9. Wiring diagram ----------------------------------- 27
10. Basicblockdiagram --------------------------- 28
11. Printed wiring board diagram ---------------- xx
12. Disassembly diagram------------------------- 30
13. Replacement partslist ------------------------ 31
Contents
Service Warning
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
TA 001
Ver. TA 001.02
Circuit Board Layout w/ part #'s
Updated 3/24/06

Plasma Television
N FOR SAFETY
read this page before repair the monitor. p you stay safe and prevent accidents during the repair
work.
 Please f
CAUTIO
Please
The following safety precautions are designed to hel
take note o these cautionary flags.
Warning This means "Potential to sustain injury or even death."
Caution This means "Potential to sustain breakage or irreparable damage."
 Als onso note these cautionary ic
This means "CAUTION" This means "MUST"
This means "POTENTIAL ELECTRIC
SHOCK" This means "DO NOT"
WARNING
 Follow in Must usestructions.  same types of wires and components.
The cabinet, chassis, and labels are p
that require attention. You must follow the
caution notes and safety instructions
presented
arts
throughout this User Manual to
revent damage to them or injury top
yourself.
 Prevent electric shock.
es
ver,
u
rts to their original
onditions in order to prevent electric
The Monitor uses special tubes and tap
made from insulated materials. Moreo
some materials are kept from making
contact with the PWB for the sake of
safety.Internal leads are kept from hot
parts or high voltage parts by means of
clamps or other measures. As such, yo
must restored these pa
c
shock or fire.
 Perform safety check when done.
Exercise caution while working on th
device as the Monitor contains high
voltage parts and power supply.It is
possible to sustain severe injury or dea
if you accidentally touch the wrong
parts.You must disconnect the po
supply while servicing, reassembling, or
change parts. If
e
th
wer
you touch a live
onnection it is possible to sustain severec
injury or death.
 Use recommended components.
fter
he impedance value is
ss than 4M ohm, then electric shock or
Every part (such as removed screws,
components, and wiring) must be
restored to their prior conditions a
servicing.Be sure to check everything
that was repaired for damage or
mistakes. Also measure the insulated
impedance with a meg-ohm meter to
confirm that the impedance value is more
than 4M ohm.If t
le
fire may result.
 Do not tr
comb na
y to check the HDCP code and
tion circuit.i
Use only the recommended components
or componentst that structurally identica
to the originals. This is to ensure safety
and reliability. Pay special att
parts in the parts list and circuit diagram
marked with
l
ention to s
. If you use
non-recommended components, then
electric shock or fire may result.
Never remove the shield case protecting
the HDCP code and combination circuit.
2

rp or hard objects.
lean the screen with a soft cloth moistened with warm water and dry with a second soft cloth. If it is not
gent. Do not use harsh or abrasive cleaners.
ne detergents, alcoholic detergents, abrasive cleaners, powder soaps, OA cleaners, car
and so on. They will cause discoloration, scratches or cracks.
he 42-inch color plasma display panel, with a resolution of 1024 (H) x 1024(V) pixels, creates a widescreen
and can be hung on a wall with an optional wall mounting kit.
his panel displays a wide range of personal computer signals from 640 x 400 VESA, 640 x 480 VGA to 1024
ystem
he included remote control operates all Monitor functions. Futhermore, the on-screen display system shows
gs in an easy-to-view fashion.
 Power saving system
When connected to a VESA DPMS-compliant PC, the monitor cuts its power consumption while idle.
PRECAUTIONS
 Cleaning the monitor's plasma screen panel
Before cleaning the monitor, turn it off and disconnect the power plug from the power outlet. To prevent
cratching or damaging of the plasma screen face, do not knock or rub the surface with shas
C
enough, then use a cloth with mild deter
 Cleaning the monitor's cabinet
Use a soft cloth to clean the monitor's cabinet and control panel. When excessively soiled, dilute a neutral
detergent in water, wet and wring out the soft cloth in it, gently clean the cabinet, and then wipe it down with a
ry soft cloth.d
Never use acid/alkali
wax, glass cleaners,
1. Features
 High definition Plasma display panel
T
picture. This panel features a thin form factor
 High Performance Digital Processor
T
x 768, 1280 x 1024 XGA.(RGB Analog input).
 Easy-to-use remote control and on-screen display s
T
the status of the control settin
3

2. Specifications
Display
dimensions Approx. 42inches (922 (H) x 522 (V) mm, diagonal 1059mm)
Panel Resolution 1024 (H) x 1024 (V) pixels
Net dimensions 1036 (W) x 771 (H) x 300 (D) mm (With stand)；1036 (W) x 713 (H) x 121 (D) mm (Without stand)
Net weight 46 kg (With stand)；41.5 kg (Without stand)
Temperatur Operating: 0°C to 40°C, Storage: -15°C to 60°C
Ambient
conditions Relative umidity Operating: 20% to 80%, Storage: 20% to 90% (non-condensing)
Power supply AC100 - 240V, 50/60Hz
Power consumption/at standby <400W / <1W
Audio output Built in 10W + 10W (8 Ω) speakers
(RGB input)
Input terminals
‧ANALOG RGB input terminal (D-sub 15-pin)
‧DVI input terminal (DVI-D)
‧DVI/ANALOG RGB audio input terminal (3.5mm Stereo Mini Jack)
Video signals 0.7 Vp-p
Input signals
Sync signals H/V separate, TTL level [2kΩ]
H/V composite, TTL level [2kΩ]
Recommended signal Analog: 20 modes; Digital: 18 modes
(Video input)
Input terminals
‧COMPOSITE VIDEO input terminal (RCA)
L/R COMPOSITE AUDIO input terminal (RCA)
‧S-VIDEO input teminal (RCA)
L/R S-VIDEO AUDIO input terminal (RCA)
‧Y-PB/CBPR/CRinput terminal (RCA)
L/RY-P
B/CBPR/CRAUDIO input terminal (RCA)
Input signals
Video signals NTSC-M
480i , 480p , 1080i/60 , 720p/60
Video output Signal
‧SUBWOOFER output terminal (RCA)
‧TV VIDEO output terminal (RCA)
‧L/R AUDIO output terminal (RCA)
‧OPTICAL OUT DIGITAL AUDIO output terminal
Recommended signal 4 modes
(TV RF input)
Input signals Input terminals ‧ANALOG RF input terminal (NTSC)
‧DIGITAL RF input terminal (ATSC)
 It takes at least 30 minutes to attain the maximum picture quality.
Applicable video signals for each input terminal
RCA DVI D-sub Remarks
Signal Type
Terminal Composite Video S-Video Component PC/STB RGB
ANALOG RGB 
DVI 
COMPOSITE 
S-VIDEO 
Y-PB/CBPR/CR
1080i/720p/480p/480i inputs.
(: Avaliable)
4

3. Component names
 Main unit
Control panel
 Al Adjustment buttons are located on the bottom of
the control panel
 Indications for each button's function can be found
on the inside of the control panel cover.
1. POWER 4. RIGHT X7. SELECT
2. CHANNEL S5. VOL W
2. UP S5. LEFT W
3. CHANNEL T6. INPUT
3. DOWN T6. EXIT Normal Button Action
4. VOL X 7. MENU
Button Action when MENU engaged
Power lamp
Remote-control receiver
Main power switch
The main
power switch is
located at the
back, on the
right side.
5

 Remote Control
1.PowerButton
2. Mute Button
3. Recall Button
4. Quick Buttons
5. PC Buttons
6. Video Buttons
7. NTSC Buttons
8. DTV Button
9. Numbers Button
10. RTN Button
11. Exit Buttons
12. Menu Button
13. Up/Down/Left/Right Button
14. SEL Button
15. Ch +/- Button
16. Vol +/- Button
17. DTV Menu Button
18. Back Button
19. OK Button
20. Fav. ch. Button
21. Info Button
22. PC ADJ. Button
23. Freeze Button
24. C.C. Button
25. Aspect Button
26. P. Mode Button
27. Zoom-/+ Button
28. MTS Button
29. PIP Swap Button
30. PIP Input Button
31. Sleep Button
6

4. Service points
 Lead-free solder
This product uses lead-free solder (unleaded) to help protect 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℃).
 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℃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℃)
Recommended temperature range per part:
Part Soldering iron temperature
Mounting (chips) on mounted PCB 320℃±30℃
Mounting (chips) on empty PCB 380℃±30℃
Chassis, metallic shield, etc. 420℃±30℃
(1) EMI PWB, AUDIO TRANSFER PWB, RS-232 PWB, AUDIO PWB, KEY PWB, IR PWB, I/O PWB,
CONNECTOR PWB, SPEAKER CONNECTOR PWB
(2) MAIN PWB
(3) ATSC BOX(Digital Tuner Module) / TUNER
(4) POWER PWB
(5) PDP MODULE (is all lead free solder. X-SUS PWB, Y-SUS PWB, LOGIC PWB, ADDRESS PWB, SDM
PWB)
The PWB assembly which has used lead free solder
7

8
42HDF52
5. Service Adjustments
Service Mode
This model has a limited service mode; there is no access to I2C parameters of any kind. The only service adjustments that can
be performed are the color temperature defaults.
Please note that to perform these adjustments, a colorimetry meter, such as a Minolta CA-100 or CA-200 is required to meas-
ure the actual screen during adjustments.
Color Temperature
This model has four (4) different color temperature defaults. The associated color temperature X:Y readings are shown below
on Table 1.
Preliminary:
Input 100 IRE white image. Allow 15 minutes warm up.
Procedure:
COLOR MODE X READING Y READING
COOL 0.268 +/- 0.01 0.283 +/- 0.01
NATURAL 0.285 +/- 0.01 0.293 +/- 0.01
WARM 0.314 +/- 0.01 0.327 +/- 0.01
BLACK & WHITE 0.335 +/- 0.01 0.343 +/- 0.01
Table 1
(continued)
Video
Color Temperature Cool
MENU Video
Image
Audio
Language
System
Video
Picture Mode
Tint
Sharpness
Color Temperature
Reset
Dynamic
1
Cool
1
O
O
SEL
SEL
Video
Color Temperature
Video
Color Temperature
Video
Color Temperature
Natural
Warm
Black/White
(Instruction) (Remote) (OSD)
1. Press the MENU button on remote.
2. Scroll or until Video is high-lighted.
3. Press the SEL button on remote.
4. Scroll or until Color Temperature is high-lighted.
(see note 1)
5. Press the SEL button on remote.
6. Scroll or until the Color Temperature which needs
adjustment is indicated at the right side.
Notes:
1. There are three (3) possible displays on this step, depending on
which Picture Mode is selected. Color Temperature follows Pic-
ture Mode, i.e. Dynamic >Cool,Natural >Warm,Cinema >
Warm. OSD controls for Brightness,Contrast, and Color only
appear when in Natural picture mode.

9
42HDF52
1.
2.
3.
4.
5.
6. (Continued from previous page)
(Instruction) (Remote) (OSD)
7. Press the SLEEP button on the remote three (3) times. A new
line will appear below Color Temperature which co-
responds to whatever color temp had been selected in the pre-
vious step.
8. Scroll or until Cool Adj.2is high-lighted.
9. Press the SEL button on remote. The Red, Green , and Blue
parameters will appear.
10. Use or and or until the actual color temperature as
measured on the screen is within the specs shown in Table 1.
Video
Color Temperature Cool
Video
Color Temperature Cool
Cool Adj.
Video
Color Temperature Cool
Cool Adj.
SLEEP
SLEEP
SLEEP
SEL Video
Cool Adj.
Red 255
Green 194
Blue 252
Notes:
2. Depending on which temperature is being adjusted. Could be any of the following:
Cool Adj.
Natural Adj.
Warm Adj.
Black/White Adj.
Video
Warm Adj.
Red 255
Green 151
Blue 138
Video
Black/White Adj.
Red 255
Green 136
Blue 109
Video
Natural Adj.
Red 255
Green 166
Blue 202
Video
Cool Adj.
Red 255
Green 194
Blue 252
Sample values of the different color temperature parameters

10
6. Troubleshooting
The flow chart shown below will help you to troubleshoot your Monitor set with it doesn’t display normally.
Each procedure offers a simple way to check for system errors. Before starting, ensure that there is a signal in
and that the Monitor is turned on.
zPower turn on issue
Is the input voltage
applied to Power
supply unit?
(CN61 ①③)
Power cannot be turn on (LED does not light)
No
Yes
AC inlet
Check if the Power Cord
has been well connected
to TV?
Connect the wire
properly.
No
Yes
PBC-Main
Are the voltages applied
to CN10①⑤⑥ pins and
CN11①③④⑩ pins of
Power supply unit?
Yes
Power
switch AC Fuse 5HTP10 TL.510A 250V Filter PWB
(CN61) 110V ①L ③W
(CN10) ①+5V ⑤+12V ⑥+12V
(CN11) ①+5V ③+3.3V ④+3.3V ⑩+5V
Power supply unit
No
Test again
Note: Voltage shown for CN10 and CN11 are at Power On State.
Power off voltages are 0V, except CN11 Pin 10, this voltage is
always present.
CH 2

 No sound issue
Are the signals applied to
P23①②④of the
PBC-Main?
PCB-Audio PCB-Speaker
Connector
(CN2) ①+15.5~16V ②GND
(P23) ①NC ②L GND ④R
No
PCB-Main or PCB-I/O
Speakers
Yes
Yes
Are there signals on
the speaker terminals?
Power supply unit
No sound
Yes
No
Check
No
Take off the back cover and
check ifl wires of the speakers
terminals have been well
connected to the PCB-Main
and s
p
eakers ?
Are the voltages applied to
CN2①② of the power
supply unit?
Picture is displayed. But no sound
Yes
No
11

12
zNo picture issue
Yes
Red
Power supply
unit
Picture is not diaplayed (LED is lighting)
Is the LED red or
green ?
Is the voltages of
CN10/CN11 on the
power supply unit?
(CN10) ①5V ⑤⑥12V
(CN11) ①5V ③④3.3V ⑩st-5V
Is it the power
saving mode ?
Green Is voltage applied to
CN11 ⑩(st-5v) ?
PCB-Main
No
Yes
Input signal
cables or
PCB-Main
Are the voltages applied to
CN64①⑩ of the power
supply unit correct?
Yes
Panel module
Yes
No
Power supply unit
No
Power supply unit
Note: Voltage shown for CN10 and CN11 are at Power On State.
Power off voltages are 0V, except CN11 Pin 10, this voltage is
always present.
CH 2

 Remote Control doesn’t work
Yes
Try if another Remote
Controller works?
Yes
No
Check if batteries are
placed correctly? Put new batteries to
the remote control
No
Yes
Take off the back cover.
Check if the wire of PCB-IR
has been well connected to
the PCB-Main?
No
Change the PCB-IR
then check if it works.
Replace the Remote
Controller.
Change PCB-Main then connect all
wires properly.
No
Yes
Connect the wire
properly.
Test
again
Remote controller doesn’t work.
13

 Key pad doesn’t work
Take off the back cover and check if
the wire of PCB-Speaker connectoer
has been well connected to the
PCB-Key Pad and PCB-Main?
No
Yes
Change PCB-Key Pad and
connect all wires properly.
Check if it works
Yes
No
Change the PCB-Main.
Connect
the wire
properly
Change PCB- Speaker
connectoer and connect all
wires properly. Check if it works
Test
again
Key pad doesn’t work.
14

 No PC signal (Analog RGB/DVI)
Check if the D-Sub or DVI
cables have been well
connected to the PDP?
Y
es
No
Check if the signal
frequency is higher than
1024x768 ?
Adjust the signal
frequency.
No
Yes
Take off the back cover.
Connect the D-Sub
or DVI cables
properly
Change the
PCB-Main
Yes
No
Check PC by PC
Service Provider
Check if PC source is
working on other
display?
Test
again
No PC signal.
15

 NTSC TV source no signal
Check if the TV cable has
been well connected to the
PDP?
Yes
No
Check if the “Channel
Search” function has been
done?
Execute the “Channel
Search” function.
No
Yes
Check if the Assembly
PCB-Video has been well
connected?
No
Yes
Change the NTSC Tuner
Board and check if it works.
Make sure the OSD TV
source option is correct
(Cable/Air)
No
Yes
Select to the correct
option
Connect the Assembly
PCB-Video properly.
Yes
Change the
PCB-Main
No
Connect the TV
cable properly
Test
again
No NTSC TV Signal
16

 DTV source no signal
Is the multi I/O connector
connected with scaler board
Turn the TV off
Is the tuner connected
with antenna / cable
connector
Be sure have done
the channel scan
Connect it firmly
Connect it firmly
Is the signal received
Problem has
been resolved
Problem has
been resolved
Make auto scan
Is the signal received
Change the tuner module
Is the signal received
Problem has
been resolved
Cannot receive any digital channel
Yes
No
No
Yes
No
Yes
No
Yes
No
No
Yes
Yes
17

 No optical audio sound
Is the multi I/O connector
connected with scaler board Connect it firmly
Is the audio work
Problem has
been resolved
Is it in “MUTE” mode
Press “MUTE” or “VOL+”
so that audio work
Be sure this channel
was been locked
Change the tuner module
No audio service
Yes
No
Problem has
been resolved
Problem has
been resolved
No Scan this channel by
using “Manual Scan”
No Is the audio work Yes
Yes
Yes
No
No
Yes
No
Yes
18

 No signal issue (Composite, SV, YCbCr, YPbPr)
Check if the signal source
is available and been well
connected?
No
Yes
Enable source and
connect the signal wire
properly.
Check if the PCB-I/O has
been well connected to
the PCB-Main?
Connect the PCB-I/O
properly.
No
Yes
Take off the back cover.
Check if Wire Ass’y 31P
has been well connected to
PCB-Main?
No
Yes
Connect Wire Ass’y 31P
properly to the
PCB-Main.
Change the PCB-I/O
then check the signal
No Change
PCB-Main board
Test
again
Yes
No si
g
nal
19

 Power board issues
1. No power
D001
NO Vs, Va, Vcc, STB
FUSE
STB
impedance check
D001
impedance check
Q003/Q004
impedance check
Q201
impedance check
Q301
check voltage
D020(k)-J051 Q003/Q004/R005 ect
Q200/Q201/Q202/D210
ect
Q301/Q302/Q303/D310
ect
Over 130V
NG
OK
OK
OK
OK
NG
NG
NG
NGNG
OK
See NO PICTURE &
SOUND
Under 130V D151, D101 etc
IC101, R005
NO POWER
2. No picture and sound
NG
SEE NO POWER
NO Vs, Va, Vcc,
FUSE
Vcc check voltage
D020(k)-J051
OK
NG
OK
See NO PICTURE
Under 130V
IC001, D601~D604, RL001,
PC001, PC003, IC002 etc
PC201, PC202, D210
etc
NO PICTURE &
SOUND
Over 130V
20