Hitachi 51UWX20B User manual

DP23/23G/24
SAFETY PRECAUTIONS ......................................................................................................2
TECHNICAL CAUTIONS ......................................................................................................3
SPECIFICATIONS..................................................................................................................4
GENERAL INFORMATION ....................................................................................................5
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS ....................................................6
SERVICE ADJUSTMENTS..................................................................................................17
DC VOLTAGE ......................................................................................................................36
BASIC CIRCUIT DIAGRAM ................................................................................................51
PRINTED CIRCUIT BOARDS ............................................................................................72
BLOCK DIAGRAM ..............................................................................................................74
WIRING DIAGRAM ..............................................................................................................76
FINAL WIRING DRAWING ..................................................................................................78
EXPLODED VIEW ..............................................................................................................84
EXPLODED VIEW PARTS LIST ..........................................................................................90
QUICK REFERENCE PARTS LIST ....................................................................................95
REPLACEMENT PARTS LIST ............................................................................................96
DISASSEMBLY INSTRUCTIONS ......................................................................................117
TROUBLESHOOTING BLOCK DIAGRAMS......................................................................125
PA No. 0162
NTSC DP23/DP23G/DP24 R/C: CLU-4321UG
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
JUNE 2002 HHEA-MANUFACTURING DIVISION
51UWX20B DP23
57UWX20B DP23
51GWX20B DP23G
57GWX20B DP23G
43FWX20B DP24
SERVICE MANUAL
This addendum gives differences between DP23/DP23G/DP24 and the DP27/DP27D chassis
models. For any other information, see the DP27/DP27D chassis Service Manual PA No. 0160
issued in MAY 2002.
CAUTION: Before servicing this chassis, it is important that the service technician read the
”Safety Precautions” and “Servicing Precautions” in Service Manual PA No. 0160.
PROJECTION COLOR TELEVISION
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW

2
DP23/23G/24
Components having special safety characteristics are identified by a on the schematics and on the parts list in this service
manual and its supplements and bulletins. Before servicing this chassis, it is important that the service technician read and
follow the “Important Safety Instructions” in this Service Manual.
For continued X-Radiation protection, replace picture tube with original type or Hitachi approved equivalent type.
This Service Manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified
technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex
products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void warranty. If you
are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the
repair to a qualified service technician.
WARNING
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which
may cause birth defects or other reproductive harm (California Health and Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact
with solder. Also, when soldering do not inhale any smoke or fumes produced.
This television receiver provides display of television closed captioning in accordance with section 15.119 of the FCC rules.
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.
IMPORTANT SAFETY INSTRUCTIONS
USE ISOLATION TRANSFORMER WHEN SERVICING
!

3
DP23/23G/24
High Voltage limiter circuit operation check.
1. Turn off TV and connect jig as shown in Figure 2. Adjust
jig fully counter-clockwise for minimum resistance.
2. Set the AC input to 120V AC and turn on TV.
3. Confirm test pattern on CRT is a usable picture, then
slowly adjust jig until the picture disappears and TV shuts
down.
4. When the limiter circuit is operating properly, High
Voltage will be less than 30.5 kV at 1.4mA when TV shuts
down.
5. Turn off set immediately after checking circuit operation.
6. Unplug set for one minute to reset shutdown circuit.
Remove jig and voltmeter.
TECHNICAL CAUTIONS
(TH01)
WHITE side
GND side
TESTER
C901
R901
EF901 EF901
F901
KP01
PA
12
X901
R903
C981
R980
AC CORD POLARITY
This check is based on the UL standard. Use the jigs specified by the production technology section. The GND side (wider
blade) of the AC power cord should be connected to K9Y1

4
DP23/23G/24
Models: 51UWX20B 51GWX20B
57UWX20B 57GWX20B
43FWX20B
Cathode-Ray Tube:
51/57UWX20B R=P16LXL00RFA(U)
51/57GWX20B G=P16LXL00HHA(U)
B=P16LXL00BMB(U)
43FWX20B R=P16LXS00RFA(U)
G=P16LXS00HHA(U)
B=P16LXS00MBM(U)
Power Input: 120 volts AC, 60 Hz
Power Consumption:
•Stand-By Power
51/57UWX20 . . . . . . . . . . . . . . . . . . .0.96W
43FWX20B/51/57GWX20B . . . . . . . . .0.96W
•Power Consumption (operating)
51/57UWX20 . . . . . . . . . . . . . . . . . . .188W
43FWX20B/51/57GWX20B . . . . . . . . . .203W
•Power Consumption (maximum)
51/57UWX20 . . . . . . . . . . . . . . . . . . .227W
43FWX20B/51/57GWX20B . . . . . . . . . .248W
Antenna Impedance: 75 Ohm Unbalanced
VHF / UHF / CATV
Receiving Channel: BAND CH
VHF 2~13
UHF 14~69
EXT. Mid (A-5)~(A-1), 4+
CATV Mid. A~I
CATV Super J~W
CATV Hyper (W+1)~(W+28)
CATV Ultra (W+29)~(W+84)
Intermediate Frequency: Picture l-F Carrier 45.75 MHz
Sound l-F Carrier 41.25 MHz
Color Sub Carrier 42.17 MHz
Video Input: 1 Volt p-p, 75 Ohm
Video Output: 1 Volt p-p, 75 ohm
Audio Input: 470 mVrms, 47 k Ohm
Stereo Audio Output: 470 mVrms, 1 k Ohm
Audio Output Power:
Front: 12 watts per channel at 10% distortion,
8 ohm Impedance. Max output – 24 watts.
Anode Voltage:
DP23/DP23G/DP24 30.2±0.3kv (1.20±0.2mA)
Brightness: 51” 57” 43”
(white screen) 220cd/m2180cd/m2300cd/m2
Speakers: 2 Woofers - 5 inch (12 cm) round
Dimension:
43” 51” 57”
Height (in.) 38 31/32 50 1/8 54 3/16
Width (in.) 41 7/32 44 1/2 54 1/64
Depth (in.) 20 5/8 25 1/32 25 1/32
Weight (Ibs.) 153 238 265
Circuit Board Assemblies:
C.P. T. (B) P.W.B. IR P.W.B.
C.P. T. (G) P.W.B. IR Sub P.W.B.
C.P. T. (R) P.W.B. Terminal P.W.B.
Power Supply P.W.B. Signal P.W.B.
Control P.W.B. Def/Convergence P.W.B.
Sensor Distribution P.W.B.
CIRCUIT PROTECTION
CAUTION: Below is an EXAMPLE only. See Replacement Parts List for details. The following symbol near the fuse
indicates fast operation fuse (to be replaced). Fuse ratings appear within the symbol.
125V
6A
F
6 A 125V
Example:
SPECIFICATIONS
“RISK OF FIRE - REPLACE FUSE AS MARKED”
The rating of fuse F901 is 6A - 125V.
Replace with the same type fuse for continued protection
against fire.

GENERAL INFORMATION
Antenna Input/Output S-VIDEO Inputs 3 and 4
Audio/Video Inputs 1, 2, 3 and 4 Component Input Y-PBPR
MONITOR OUT DVI-HDTV Input (Input 1)
AUDIO TO HI-FI Output (UWX and GWX Models Only)



P
B
P
R

P
B
P
R


ANT A
TO
CONVERTER
ANT B
L
Y
R(MONO)/L
AUDIO
TO HI-FI
R
S-VIDEO
S-VIDEO
S-VIDEO
Y/VIDEO
R(MONO)/L
R(MONO)/L VIDEO
R(MONO)/L VIDEO
RLVIDEO
INPUT 1
INPUT 2
INPUT 3
INPUT 4
MONITOR
OUT
AUDIO
AUDIO
AUDIO
P
B
P
R
P
B
P
R
DVI-HDTV





L
AUDIO
TO HI-FI
R

ANT A
TO
CONVERTER
ANT B
Y
R(MONO)/L
S-VIDEO
S-VIDEO
S-VIDEO
Y/VIDEO
R(MONO)/L
R(MONO)/L VIDEO
R(MONO)/L VIDEO
RLVIDEO
INPUT 1
INPUT 2
INPUT 3
INPUT 4
MONITOR
OUT
AUDIO
AUDIO
AUDIO
INPUT 5
S-VIDEO
VIDEO
-AUDIO-
L/MONO R
EXIT
INPUT
SELECT
MENU
MAGIC FOCUS VOL- VOL+ CH- CH+

POWER
PULL
Models: 51GWX20B/57GWX20B/51UWX20B/57UWX20B
INPUT 3
S-VIDEO VIDEO AUDIO
L/MONO R
EXIT
INPUT
SELECT
MENU
MAGIC
FOCUS
VOL- VOL+ CH-
CURSOR



POWER
PUSH
Model: 43FWX20B
CH+
FRONT CONTROL PANEL
REAR PANEL JACKS
5
DP23/23G/24

6
DP23/23G/24
REMOTE CONTROL
123
456
789
0
ANT INFO
VOL CH
POWER
TV CBL/SAT DVD/VCR
PIP SWAP PIP MODE FREEZE
VIDEO PIP CH MENU
MUTE EXIT LAST CH
REC ASPECT VIRTUAL HD
SELECT
CLU-4321UG
VID1 VID2 VID3 VID4
VID5
CLU-4321UG

7
DP23/23G/24
Select VIDEO to adjust picture settings and improve picture quality.
MENU
THUMB
STICK
THUMB
STICK
SELECT
Setup
Locks
Ch. Manager
Audio
Video
Move
SEL
Sel
Color
Brightness
Contrast
Picture Mode
Video
Move
SEL
Select
Vertical Position
Sharpness
Tint
Advanced Settings
Color System
100%
50%
50%
50%
0
Magic Focus
Sports
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS
Use this function to change the contrast between black and white levels in the picture. This adjustment
will only affect the picture when ADVANCED SETTINGS DIMMER is OFF.
Use the THUMB STICK or to highlight the function to be adjusted.
Press the THUMB STICK or to adjust the function. Press down on THUMB STICK to select the function settings.
Press MENU to return to main menu or select PICTURE MODE to return to previous menu.
Press EXIT to quit menu.
Use this function to adjust the level of color in the picture.
Use this function to adjust overall picture brightness.
This function allows you to select when aspect style is either 4:3 EXPANDED/ZOOM1/ZOOM2. Vertical
position can be changed with this mode. Adjustable range is -10 (video center is toward bottom of
screen) to +10 (video center is toward top of screen).
Contrast
Color
Brightness
Vertical Position
NOTES: 1. If CONTRAST is selected, you are adjusting CONTRAST. The additional menu items BRIGHTNESS, COLOR, TINT,
and SHARPNESS can be selected and adjusted in the same manner.
2. It may be necessary to adjust TINT to obtain optimum picture quality when using the COMPONENT VIDEO Y-PBPR
input jacks.
3. If you are using the COMPONENT VIDEO input jacks (Y-PBPR) and notice that the TINT and COLOR are abnormal,
check to make sure that VIDEO- Color System is set properly.
Use this function to adjust flesh tones so they appear natural.
Tint
Use this function to adjust the amount of fine detail in the picture.
Sharpness
Video

8
DP23/23G/24
8
MAGIC
FOCUS
MAGIC FOCUS
Auto Digital Convergence Adjustment
Please turn ON your television for at least 20 minutes before using this feature.
The Magic Focus button will not work when Adjustment Mode is set to Manual (see page 9).
Your HITACHI Projection TV has three color projection tubes: one for red, one for green, one for blue. When mixed together in the proper
proportion, the output of these three color tubes can produce any color. To produce these colors, however, the beams must be precisely
aligned over each other so that the colors can be mixed. The process of aligning these picture beams is called “convergence”.
Over a period of time, the picture tubes can drift out of alignment due to normal bumps and vibrations or moving the TV. If you move
your TV, or if, after a time, you notice color rings or halos around objects in the picture, you may want to converge (align) the colors.
Properly converged, the lines appear white, which is actually a combination of the outputs of the three color tubes. The output of the
green tube is stationary. The outputs of the red and blue tubes can be adjusted. When properly aligned, the outputs of all three tubes
should be directly over each other to produce the white lines.
To simplify convergence, HITACHI incorporates a function called MAGIC FOCUS located on the front control panel, which allows the TV
to self-adjust. Press this MAGIC FOCUS button and the convergence self adjustment will start and this process will take approximately
20 seconds. If this button is pressed during this process, no change in picture quality will occur. After this 20 second self-adjust period,
picture quality will be optimum. (Do not move the TV during self-adjust.)
You may also select Magic Focus from the VIDEO menu.
Magic Focus
NOTES: Only a momentary press of the MAGIC FOCUS button is necessary to start AUTO DIGITAL CONVERGENCE. At any
time during this convergence correction process, you may press the MAGIC FOCUS button to exit the MAGIC FOCUS
mode. However, the convergence correction process needs to be completed to SAVE the new corrected convergence
data.
Magic Focus
Video
Move
SEL
Return
Aligns the Red, Green, and Blue
colors to correct for Magnetic
Influences.
Auto
Manual
MENU
THUMB
STICK
THUMB
STICK
SELECT
Setup
Locks
Ch. Manager
Audio
Video
Move
SEL
Sel
Color
Brightness
Contrast
Picture Mode
Video
Move
SEL
Select
Vertical Position
Sharpness
Tint
Advanced Settings
Color System
100%
50%
50%
50%
Magic Focus
Sports
THUMB
STICK
SELECT
Adjustment Mode
If you want to adjust now
THUMB
STICK
THUMB
STICK
SELECT
Start
MAGIC FOCUS
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS

9
DP23/23G/24
9
NOTES: 1. Please turn ON your television for at least 20 minutes before using this feature.
2. Auto Adjustment Mode is recommended. If convergence is still not acceptable, use the Manual Adjustment Mode.
DO NOT press MAGIC FOCUS or use Auto Adjustment Mode after using Manual Adjustment Mode.
Manual Convergence Adjustment Mode
Using the Remote Control, select VIDEO-MAGIC FOCUS-MANUAL ADJUSTMENT MODE-START to access convergence crosshatch
pattern. The adjustment point is indicated by the Adjustment Point Cursor.
To Move Adjustment Point
To move adjustment point, the Adjustment Cursor must be WHITE. Use the THUMB STICK to move the Adjustment Cursor. Another
way to move the Adjustment Point Cursor is to press the followiing buttons: [2] up, [4] left, [5] down, [6] right. If you use the number
buttons while the adjustment point is WHITE, it will change to RED.
To Change the Color of Adjustment Point
Press the SELECT button repeatedly (WHITE-RED-BLUE-WHITE...). Green color is fixed and cannot be adjusted.
To Adjust the Convergence
Move the Adjustment Cursor to the point to be adjusted. Use the THUMB STICK to match the RED and BLUE colors to GREEN
(reference color). Properly aligned, all three colors should appear white.
If convergence is acceptable after Manual Convergence adjustment, press EXIT button to access menu mode.
Press the [1] button on the remote control to SAVE adjusted data and return to main picture.
Press the [2] button on the remote control to CANCEL adjusted data and return to main picture.
Press the [3] button on the remote control to recall the factory pre-set convergence data.
Press the [4] button on the remote control to return to the manual convergence adjustment mode (crosshatch pattern).
Press the [9] button on the remote control to read the SAVED data.
Magic Focus
Video
Move
SEL
Return
Aligns the Red, Green, and Blue
colors to correct for Magnetic
Influences.
Auto
Manual
MENU
THUMB
STICK
THUMB
STICK
SELECT
Setup
Locks
Ch. Manager
Audio
Video
Move
SEL
Sel
Color
Brightness
Contrast
Picture Mode
Video
Move
SEL
Select
Vertical Position
Sharpness
Tint
Advanced Settings
Color System
100%
50%
50%
50%
Magic Focus
Sports
THUMB
STICK
SELECT
Adjustment Mode
If you want to adjust now
THUMB
STICK
THUMB
STICK
SELECT
Start
EXIT
DONE : [1]
CANCEL : [2]
INI. RESET : [3]
BACK : [4]
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS

10
DP23/23G/24
Select AUDIO to adjust the TV to your preference and to improve the sound quality.
Audio
MENU
THUMB
STICK
THUMB
STICK
SELECT
THUMB
STICK
SELECT
Setup
Locks
Ch. Manager
Audio
Video
Move
SEL
Sel
Next/Prev Change Value Return
SEL
Sound Enhancement
Balance
Bass
Treble
Audio
Move
SEL
Return
50%
50%
Sound Enhancement
Balance
Bass
Treble
Audio
Move
SEL
Select
50%
50%
Treble
50%
THUMB
STICK
Advanced Settings
Advanced Settings
LR
LR
This function controls the low frequency audio to all speakers.
Use THUMB STICK to highlight functions.
Press down on THUMB STICK to select the function setting.
Press THUMB STICK or to adjust the function.
Press EXIT to quit MENU, or select Audio to return to the main menu.
NOTE: If TREBLE is selected you are adjusting treble. The additional menu items Bass and Balance can be selected
and adjusted in the same manner.
This function controls the high frequency audio to all speakers.
This function will control the left to right balance of the TV internal speakers and the AUDIO TO HI-
FI output.
Bass
Balance
Treble
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS