Hitachi DP23-DP23G-DP24 Projection TV Service Manual.pdf
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PANO 0162 Links.QXD
DP23/23G/24
PA No. 0162
51UWX20B
DP23
57UWX20B
DP23
51GWX20B
DP23G
57GWX20B
DP23G
SERVICE MANUAL
43FWX20B
DP24
NTSC
DP23/DP23G/DP24
R/C: CLU-4321UG
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.
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW
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
PROJECTION COLOR TELEVISION
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
JUNE 2002
HHEA-MANUFACTURING DIVISION
DP23/23G/24
IMPORTANT SAFETY INSTRUCTIONS
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
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.
2
DP23/23G/24
TECHNICAL CAUTIONS
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.
4. When the limiter circuit is operating properly, High
Voltage will be less than 30.5 kV at 1.4mA when TV shuts
down.
2. Set the AC input to 120V AC and turn on TV.
5. Turn off set immediately after checking circuit operation.
3. Confirm test pattern on CRT is a usable picture, then
slowly adjust jig until the picture disappears and TV shuts
down.
6. Unplug set for one minute to reset shutdown circuit.
Remove jig and voltmeter.
(TH01)
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
R903
X901
C981
R980
C901
KP01
1
PA
2
EF901
EF901
F901
WHITE side
GND side
TESTER
3
DP23/23G/24
SPECIFICATIONS
Models:
51UWX20B 51GWX20B
57UWX20B 57GWX20B
43FWX20B
Intermediate Frequency:
Picture l-F Carrier 45.75 MHz
Sound l-F Carrier 41.25 MHz
Color Sub Carrier 42.17 MHz
Cathode-Ray Tube:
51/57UWX20B
R=P16LXL00RFA(U)
Video Input:
1 Volt p-p, 75 Ohm
51/57GWX20B
G=P16LXL00HHA(U)
B=P16LXL00BMB(U)
Video Output:
1 Volt p-p, 75 ohm
43FWX20B
R=P16LXS00RFA(U)
G=P16LXS00HHA(U)
B=P16LXS00MBM(U)
Audio Input:
470 mVrms, 47 k Ohm
Power Input:
120 volts AC, 60 Hz
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.
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:
Anode Voltage:
DP23/DP23G/DP24
30.2±0.3kv (1.20±0.2mA)
Brightness:
51”
57”
43”
(white screen) 220cd/m
2
180cd/m
2
300cd/m
2
75 Ohm Unbalanced
VHF / UHF / CATV
Speakers:
2 Woofers - 5 inch (12 cm) round
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)
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.
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.
CIRCUIT PROTECTION
Example:
F
125V
6A
6 A
125
V
The rating of fuse F901 is 6A - 125V.
Replace with the same type fuse for continued protection
against fire.
“RISK OF FIRE - REPLACE FUSE AS MARKED”
4
DP23/23G/24
GENERAL INFORMATION
Models: 51GWX20B/57GWX20B/51UWX20B/57UWX20B
Model: 43FWX20B
POWER
PULL
POWER
PUSH
S-VIDEO
VIDEO
-AUDIO-
L/MONO R
MAGIC FOCUS
VOL-
VOL+
CH-
CH+
INPUT
MENU
INPUT 5
EXIT
SELECT
INPUT
MENU
VOL-
VOL+
CH-
CH+
EXIT
SELECT
CURSOR
INPUT 3
S-VIDEO
VIDEO
AUDIO
L/MONO R
MAGIC
FOCUS
FRONT CONTROL PANEL
ANT A
ANT A
DVI-HDTV
P
R
P
B
Y
P
R
P
B
Y
INPUT 1
INPUT 1
TO
CONVERTER
R
(MONO)/L
TO
CONVERTER
R
(MONO)/L
AUDIO
AUDIO
P
R
P
B
Y/VIDEO
P
R
P
B
Y/VIDEO
ANT B
INPUT 2
R
(MONO)/L
ANT B
INPUT 2
R
(MONO)/L
AUDIO
AUDIO
R
(MONO)/L VIDEO
S-VIDEO
R
(MONO)/L VIDEO
S-VIDEO
INPUT 3
INPUT 3
R
(MONO)/L VIDEO
S-VIDEO
R
(MONO)/L VIDEO
S-VIDEO
AUDIO
TO HI-FI
INPUT 4
INPUT 4
AUDIO
TO HI-FI
L
R
L
VIDEO
S-VIDEO
R
L
VIDEO
S-VIDEO
MONITOR
OUT
L
MONITOR
OUT
R
AUDIO
AUDIO
R
REAR PANEL JACKS
Antenna Input/Output
S-VIDEO Inputs 3 and 4
Audio/Video Inputs 1, 2, 3 and 4
Component Input Y-P
B
P
R
MONITOR OUT
DVI-HDTV Input (Input 1)
AUDIO TO HI-FI Output
(UWX and GWX Models Only)
5
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