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MITSUBISHI ELECTRIC

Service Manual
PLASMA DISPLAY PANEL

2004

PD-4225S

CAUTION: Before servicing this chassis, it is important that the service person read the "PRODUCT SAFETY GUIDELINES" contained in this manual.

SPECIFICATIONS
· Pow e r : AC 100-240V, 50/60Hz 350W Typical, 400W Maximum 42" Diagonal, Viewable 16:9 480 x 852 1.08m m x 1.08mm 15.5kHz - 68.7kHz 56Hz - 120Hz · Outputs Analog PC Monitor External Speaker · Form a ts Video PC Monitor (4:3) PC Monitor (16:9) : (1) Com posite & stereo audio : (1) Mini D-Sub 15 : 2 x 5 W atts into 8 ohms

· Displa y Screen Size : Aspect Ratio : Pixel Array : Pixel Pitch : Horiz Sync Range : Vert Sync Range : · Inputs Analog PC M onitor MonitorLinkTM RF

: NTSC, 480i, 480p, 720p, 1080i : VGA, SVGA, XGA, SXGA : W -XGA

· Dim e nsions : (2) Composite, (1) S-Video, w/ speakers & base : (1) Component & stereo audio wo/ speakers & base : : (1) Mini D-Sub 15 & stereo audio : DVI, RS-232C, & stereo audio · W e ight : NTSC VHF 2-13, UHF 14-69, w/ speakers & base : CATV 1-125 wo/ speakers & base :

(W )49-5/8" (H)27-5/8" (D)10-7/8" (W )40-3/4" (H)26" (D)4-3/8"

81.7 lbs 65.2 lbs

· Weight and dimensions shown are approximate. · Design specifications are subject to change without notice.

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904 Copyright © 2004 Mitsubishi Digital Electronics America, Inc. All Rights Reserved

MODEL: PD-4225S

CONTENTS
PRODUCT SAFETY GUIDELINES ...................................................................................................... 4 DISASSEMBLY PROCEDURES .......................................................................................................... 5 ELECTRICAL ADJUSTMENTS............................................................................................................ 6 REPLACEMENT PARTS ......................................................................................................................10 BLOCK DIAGRAMS .......................................................................................................................... 12 SCHEMATIC DIAGRAMS PCB MAIN DIAGRAMS PCB TUNER DIAGRAMS PCB FRONT DIAGRAMS PCB LAYOUT DIAGRAMS

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MODEL: PD-4225S

PRODUCT SAFETY GUIDELINES
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs. CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer's approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines. 5. No lead or component should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature. The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of noninsulated "dangerous voltage" that may be of sufficient magnitude to constitute a risk of electric shock. The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE. 1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow. 2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation. 4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations. 5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured. 6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets. 7. Caution customers against using a cart or stand that has not been listed by Underwriters Laboratories, Inc. for use with its specific model of television receiver or generically approved for use with TVs of the same or larger screen size. 8. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

A

V

SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items transported to and from the repair shop. 2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated. 3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign particles. 4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

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MODEL: PD-4225S

DISASSEMBLY

(b) BACK COVER INNER (a)

PLATE A/V

1. Screws marked (a) hold the Plate Assembly in place (Plate A/V). 2. Screws marked (b) connect Plate Assembly with Back Cover Assembly. 3. Screws marked with an arrow on the back of the PDP connect the Back Cover Assembly & Outer Assembly to the Main Frame. NOTE: All three Assemblies should be removed in disassembly.

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MODEL: PD-4225S

ELECTRICAL ADJUSTMENTS
Test Equipment
· · DMM Signal Generator: RGB (VGA) - 1024x768, 60Hz, COMPONENT (YPbPr) - 1280x720p, 60Hz

Notes
· · · · · · Do not attempt an adjustment if proper equipment is not available. Because this is not a Hot chassis, no isolation transformer is required. However, the use of an isolation transformer will help protect test instruments. Perform only the adjustments required, in the correct order. Adjustment conditions... Temperature: 68°-86°F. Humidity: 55%-75%. Line Voltage: 100-240V, 50/60 Hz. Prior to adjustment, the PDP must be operated for at least 15 minutes while receiving a 100% white pattern. CAUTION: If a stationary pattern (i.e. Cross Hatch or digital generator) is displayed for more than 20 minutes, an after image (image burn) can occur.

1. PWB Power Assembly Adjustments (Va, Vs Voltage Adjustments)
These adjustments must be performed after the repair or replacement of the PWB Power Assembly, or after replacing the PDP. A. Va Adjustment 1. Supply a 100% White pattern. 2. Connect a DMM between the Va and GND pins of P805 on the PWB Power. See Figure 4. 3. Note the Va voltage listed on the label located on the panel, top right side. 4. Adjust RV601 so the voltage is equal to the voltage listed, ± 0.5V. B. Vs Adjustment 1. Connect the DMM between the Vs and GND pins of P805. 2. Note the Vs voltage listed on the label located on the panel, top right side. 3. Adjust RV401 so the voltage is equal to the voltage listed, ± 0.5V.

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MODEL: PD-4225S

EXPLODED VIEW

300

305

301

330 340 510 350

302

200

303 206 204 201 205

580

202

203 220

520 360 551 540 541 560 550 490 400

210

410

401

570

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MODEL: PD-4225S

REPLACEMENT PARTS LIST
Ref. No. 200 201 202 203 204 205 206 210 220 300 305 330 340 350 400 401 410 510 520 540 541 550 560 570 580 Part Number 6348Q-E037T 6871QDH051A 6871QDH052A 6871QCH025A 6871QYH027A 6871QRH034A 6871QZH030A 4980V00460A 4980V00464B 3211V00126B 5230V00016A 3581V00038A 3110V00324B 4810V00826A 3809V00A58E 3301V00010S 3809V00A47N 6871VSMV64B 6871VMMP39F 6871VSMV04A 5020V00666D 6871VSMU98B 6871VSMU45A 6871VSMX52B 3501V00148A 6850J00002A 6410VUH005A 6710V00129A SPEAKER-PD4225S BRACKET-SPEAKER Description PDP-NP50C2MF01 (T/A REQ) PWB-DSP YDRV ASSY (PD4225) PWB-DSP YDRV ASSY (PD4225) PWB-PDP-DRV-CONTROL PWB-YSUS ASSY (PD4225) PWB-XRRT ASSY (PD4225) PWB-ZSUS (PD4225) SUPPORTER,VERTICAL MN-42PZ40 SUPPORTER FRAME-ASSY FRONT SCREEN SHIELD (FILTER) DOOR-CONTROL CASE-ASSY COVER-BRACKET FRAME-COVER REAR PLATE-ASSY COVER-BACK ASSY PWB-FRONT-CONTROL PWB-MAIN (PD4225) PWB-PSW (PD4225) BUTTON-POWER PWB-AV (PD4225) PWB-SPK (PD4225) PWB-SUB VIDEO ASSY (PD4225) BOARD-ASSY (POWER) CABLE-DVI CORD-POWER AC REMOTE SPEAKER ASSEMBLY BRACKET-SPEAKER (EXTERNAL)

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MODEL: PD-4225S

BLOCK DIAGRAMS

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MODEL: PD-4225S

Page 10

PD-4225S POWER PWB