Hitachi DP23-DP23G-DP24 Projection TV Service Manual.pdf

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.

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

EF901

F901

WHITE side

GND side

TESTER

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

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:

125V

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”

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

INPUT 5

EXIT

SELECT

INPUT

VOL-

VOL+

CH-

CH+

EXIT

SELECT

CURSOR

INPUT 3

S-VIDEO VIDEO

AUDIO

L/MONO R

MAGIC

FOCUS

FRONT CONTROL PANEL

ANT A

DVI-HDTV

P R

P B

P R

P B

INPUT 1

CONVERTER

(MONO)/L

CONVERTER

(MONO)/L

AUDIO

P R

P B

Y/VIDEO

P R

P B

Y/VIDEO

ANT B

INPUT 2

(MONO)/L

ANT B

INPUT 2

(MONO)/L

AUDIO

(MONO)/L VIDEO

S-VIDEO

(MONO)/L VIDEO

S-VIDEO

INPUT 3

(MONO)/L VIDEO

S-VIDEO

(MONO)/L VIDEO

S-VIDEO

AUDIO

TO HI-FI

INPUT 4

AUDIO

TO HI-FI

VIDEO

S-VIDEO

VIDEO

S-VIDEO

MONITOR

OUT

MONITOR

OUT

AUDIO

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)

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