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MITSUBISHI ELECTRIC
DIGITAL LIGHT PROCESSINGTM PROJECTION TV VK26 CHASSIS
Ser vice Manual
MODELS WD-52327 WD-62327
2004
WD-52327
CAUTION: Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and "PRODUCT SAFETY NOTICE" contained in this manual.
SPECIFICATIONS
· Power Input · Power Usage · Light Engine · Light Source · Frequency Range · Antenna Input : AC 120V, 60Hz : 200W : DLP (1280 x 720p pixels) : 120W VIP : VHF 54 ~ 470MHz UHF 470 ~ 806MHz : VHF/UHF 75 unbalanced 2 - NTSC WD-52327 : 37.2"(H) x 49.6"(w) x 17.4"(D) WD-62327 : 43.7"(H) x 58.3"(W) x 19.9"(D) [WD-52327] 110 lbs [WD-62327] 139 lbs · Output Level · Speakers (8 Ohms 10W) : 2-5 inch Coaxial : VIDEO OUT JACK (RCA Type) 1.0Vp-p 75 unbalanced : AUDIO OUT JACK (RCA Type) -4.7dBm 4.7k unbalanced : MonitorLinkTM/DVI · Input Level : VIDEO IN JACK (RCA Type) 1.0Vp-p 75 unbalanced : AUDIO IN JACK (RCA Type) -4.7dBm 43k unbalanced : S-VIDEO IN JACK (Y/C separate type) Y:1.0 Vp-p C:0.286Vp-p(BURST) 75 unbalanced : COMP / Y, Cr, Cb (RCA Type) Y: 1.0 Vp-p Cr, Cb: 700mVp-p : DTV / Y(G), Pr(R), Pb(B), H, V Y: 1.0Vp-p with sync 75 (BNC) Pr, Pb: 700mV 75 H, V: 3.0Vp-p 75
· Cabinet Dimensions
· Weight
· Digital
· 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: WD-52327 / WD-62327
CONTENTS
INTRODUCTION ............................................................................................................................... 5 PRODUCT SAFETY NOTICE ........................................................................................................... 5 SAFETY PRECAUTIONS ................................................................................................................. 6 DISASSEMBLY WD-52327 & WD-62327 Front Cabinet Components .................................................................................................... 7 Rear Cabinet Components ..................................................................................................... 8 CHASSIS REMOVAL Chassis removal procedure .................................................................................................... 9 Shield Removal .................................................................................................................... 10 Chassis PWB locations ....................................................................................................... 11 Accessing the Lamp Ballast ................................................................................................ 12 OPTICAL ENGINE REPLACEMENT Optical Engine Mounting ...................................................................................................... 13 Removing the Optical Engine ............................................................................................... 14 Removing DMD Heat Sensor ................................................................................................ 15 Removing Bottom Plate & Black Support Bracket. ............................................................... 15 Installing the Optical Engine ................................................................................................ 16 SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS Removal of the Lenticular Screen and Fresnel Lens ............................................................. 17 Installation of the Lenticular Screen and Fresnel Lens .......................................................... 19 ELECTRICAL ADJUSTMENTS Equipment .................................................................................................................................... 20 Initial Setup (Option Menu) ............................................................................................................ 21 Main Menu Defaults ...................................................................................................................... 21 A/V Memory Defaults .................................................................................................................... 22 LED Indications ............................................................................................................................ 22 LED Dignostic Check .................................................................................................................... 23 Circuit Adjustment Mode ............................................................................................................... 23 Adjustment Items List ................................................................................................................... 25 Activating Internal Test Patterns .................................................................................................... 26 Adjustment Procedures ................................................................................................................ 27 Main & Sub Y level adjustments .......................................................................................... 27 Main & Sub Color level adjustments ..................................................................................... 27 White Balance Adjustments ................................................................................................. 28 Horizontal & Vertical Position adjustments .......................................................................... 28 Mechanical Adjustments ............................................................................................................... 29 Required Front Disassembly ................................................................................................ 29 Required Rear Disassembly ................................................................................................. 29 Picture Rotation Adjustment ............................................................................................... 30 Horizontal & Vertical Keystone Distortion adjustments ......................................................... 31 QUICK REFERENCE PART LIST ..................................................................................................... 32 Service Parts List ........................................................................................................................... 33 Screen Parts List ............................................................................................................................ 41 CIRCUITRY BLOCK DIAGRAMS Standby power Supplies ....................................................................................................... 42 Switched Supplies ............................................................................................................... 42
Page 3
MODEL: WD-52327 / WD-62327
Switched DC to DC Supplies ............................................................................................... 43 Video/Color Signal Path ....................................................................................................... 44 Sound Signal Path ............................................................................................................... 45 Sync Signal Path ................................................................................................................. 46 Control Circuit (Commands, Serial Data & Reset) ................................................................ 47 Control Circuit (Status Inputs, OSD Insert & CCD Insert) ...................................................... 48 PWB-FORMAT Block Diagram ............................................................................................ 49 SCHEMATIC DIAGRAMS BLOCK (PWB INTERCONNECTIONS) ......................................................................................... S1 1
Page 4
MODEL: WD-52327 / WD-62327
INTRODUCTION
This service manual provides service instructions for PTV models WD-52327 and WD-62327, using the VK26 chassis. This service manual includes: 1. Assembly and disassembly instructions for the front and rear cabinet components. 2. Servicing of the Lenticular Screen and Fresnel Lens. 3. Servicing to PWB level. The Optical Engine and Lamp Ballast are considered replaceable components. 4. Electrical and Mechanical adjustments. 5. Chip parts replacement procedures. 6. Simplified signal path block diagrams. The parts list section of this service manual includes: 1. Cabinet and screen parts. 2. Electrical parts. Block diagrams of the above listed models are included in this service manual for better understanding of the circuitry.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have special safety characteristics are identified in this service manual. Electrical components having such features are identified by shading on the schematic diagram and by bold type in the parts list of this service manual. Therefore, the replacement for any safety part should be identical in value and characteristics.
Page 5
MODEL: WD-52327 / WD-62327
SAFETY PRECAUTIONS
NOTICE: WARNING: 1. 2. Observe all cautions and safety related notes located inside the receiver cabinet and on the receiver chassis. Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment. When service is required, observe the original lead dress. Extra precaution should be taken to assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those components that indicate evidence of overheating. WARNING ... RISK OF EYE INJURY Do not look into the light source, Light Engine lens or mirror when operating the TV
Leakage current check Before returning the receiver to the customer, it is recommended that leakage current be measured according to the following methods.
1. Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part (i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a return path to the chassis should be a minimum of 1Mega Ohm. Any resistance below this value indicates an abnormal condition and requires corrective action.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after connection, and with the switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2. 2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).
Page 6
MODEL: WD-52327 / WD-62327
CABINET DISASSEMBLY (FRONT VIEW) WD-52327 / WD-62327
*Refer to the Parts List for Part Numbers
Front Cabinet Disassembly
1. 2. 3. 4. 5. 6. Remove the SPEAKER-GRILLE by pulling forward. Remove screws (a) to remove the COVER-FRONT. Remove screws (b) on the rear of the upper back cover (4 across the top and 3 on each side). Remove the 4 screws (c) holding the bottom of the Screen Assembly. Unplug connector LN from the Control Panel. Lift the Screen Assembly up slightly then pull towards the front to remove the assembly.
Page 7
MODEL: WD-52327 / WD-62327
REAR DISASSEMBLY
FILTER-COVER Removal
Remove 2 screws (d) to remove the Filter Cover.
COVER-BACK Removal
1) 2) 3) 4) Remove 9 screws (a) Remove 6 screws (b) Remove 2 screws (c) Pull the COVER-BACK from the cabinet. NOTE: To operate the TV with the COVER-BACK removed, the FILTER-COVER must be reinstalled.
Rear Plate Removal
1) 2 3) 4) Remove 6 screws (a) Remove 6 screws (b) Pull the COVER-BACK from the cabinet. Lay the Rear Plate down behind the TV.
Page 8
MODEL: WD-52327 / WD-62327
CHASSIS REMOVAL
Chassis Removal Procedure
1) 2) 2) 3) Disconnect all relay connectors shown below (JE, CC, JJ, PP, LL & EE) Disconnect the J9 and DVI connectors at the Optical Engine. Remove three screws (a) securing the chassis. Carefully slide the chassis from the cabinet.
Page 9
MODEL: WD-52327 / WD-62327
Shield Removal
1) To remove SHIELD-COVER, remove 11 screws (a). 2) To remove PWB-TERMINAL COVER, remove 9 screws (b).
Page 10
MODEL: WD-52327 / WD-62327
VK26 Chassis PWB Locations (Shield-Cover removed)
Page 11
MODEL: WD-52327 / WD-62327
Accessing The Lamp Ballast
Removing the Right Support (Rear View)
1) Remove the Air Filter. 2) Remove the 3 screws (a). 3) Lift the upper cabinet slightly to remove the support bracket.
Lift upper cabinet slightly to remove support.
(a)
Remove Air Filter
Removing the Lamp Ballast Shield (4 screws)
Unplug CJ3 & CN2 Connectors Unplug Connectors
4 Screws
Page 12
MODEL: WD-52327 / WD-62327
OPTICAL ENGINE REPLACEMENT
Optical Engine is mounted on the Adjuster assembly as shown below.
1) 2) 3) 4) 5) The Optical Engine is secured to the bottom plate with 4 screws (b). The Black Bracket is secured to the bottom plate and the Lamp Cartridge Housing with 4 screws (c). Tab (1) on the bottom plate slides into slot (1) on the Adjuster assembly. 4 screws (a) secure the bottom plate and Optical Engine to the Adjuster assembly. The Optical Engine, the bottom plate, black bracket and the Optical Engine are removed as a unit.
Page 13
MODEL: WD-52327 / WD-62327 Removing the Optical Engine
1) 2) 3) 4) Remove the Cabinet BACK-BOARD and REAR-PLATE (refer to disassembly instructions). Disconnect all connectors connected to the Engine and the PWB-FORMAT. From the rear of the TV, remove the 4 screws (c), to remove the COVER-DUCT and DMD Fan cover. From the rear of the TV, remove the 4 screws (a), shown below, securing the bottom plate to the Adjuster assembly. 5) Slide the Optical Engine, PWB-DMD and bottom plate towards the rear to remove the unit from the TV.
(a) Optical Engine (Rear View / Airduct & DMD Fan Cover Removed)
Page 14
MODEL: WD-52327 / WD-62327 Remove the follolwing parts from the Optical Engine
· · DMD Thermal Sensor The Optical Engine bottom plate and black bracket
DMD Termal Sensor Removal (Figure 1)
1) Remove screw (a) on the top of the DMD Fan. 2) Set the Thermal Sensor aside to install on the replacement Optical Engine.
(a)
Thermal Sensor Heat Sensor
Figure 1: DMD Thermal Sensor Bottom Plate & Black Bracket Removal
1) Remove the 4 screws (B) from the Bottom Plate (Figure 2) 2) Remove the two screws (c), holding the Black Bracket to the Lamp Cartridge Housing. (Figure 3)
Bottom Plate
(B)
Bottom View
Figure 2: Bottom Plate
Page 15
MODEL: WD-52327 / WD-62327
Black Bracket (C)
Front View
Figure 3: Black Support Bracket Installing the Optical Engine
1) Install the Bottom Plate, Black Support Bracket and the Thermal Sensor from the original Optical Engine, on the replacement Engine 2) Reverse the removal procedure to install the replacement Optical Engine in the cabinet. 2) The following adjustments may have to be performed after the installation. · Horizontal and Vertical Electrical Centering Adjustment. · Optical Unit Rotation Adjustment · Optical Unit Keystone Distortion Adjustments.
Page 16
MODEL: WD-52327 / WD-62327
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
CAUTION: Wear gloves when handling the Lenticular Screen and Fresnel Lens. This prevents cuts and finger prints. Do not place Fresnel Lens in the sun. This may cause fire and heat related injuries.
Lenticular Screen and Fresnel Lens Removal
1. 2. 3. 4. Remove the screen assembly shown in the Cabinet Disassembly procedure. Remove the four screws (a) to remove the bottom of the SCREEN-FRAME-BOTTOM . (Figure 1) From the front of the screen assembly, slide the BEZEL out the bottom of the Screen Frame. (Figure 2) From the rear of the screen assembly, carefully slide the Lenticular Screen and Fresnel Lens combination from the Screen Frame. (Figure 3) Note: When separating the Lenticular Screen from the Fresnel Lens, use caution while prying the Screen and Lens apart. Use a slot type screw driver, and remove the pressure sensitive double sided tape.
Figure 1: SCREEN-FRAME-BOTTOM Removal (Rear View)
Page 17
MODEL: WD-52327 / WD-62327
Figure 2: BEZEL Removal (Front View)
Figure 3: Lenticular Screen & Fresnel Lens Removal (Rear View) Page 18
MODEL: WD-52327 / WD-62327
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
Lenticular Screen and Fresnel Lens Installation
Note: Store the Lenticular Screen and Fresnel Lens in a cool dry place. High humidity may deform the Lenticular Screen and Fresnel Lens. 1. Apply double coated tape (Part #LENS-TAPE) along the top rear edge of the Lenticular Screen, as shown below. Refer to the table below for the tape length. 2. Sandwich the Fresnal Lens and Lenticular Screen together. The Lenticular Screen label must be towards the front and the Fresnel Lens label towards the rear. (Figure 4) 3. Apply pressure at the top edge to bond the screens together. 4. Reverse the Screen Removal procedure and insert the screens in the Screen Fame Assembly.
Figure 4: Installing the Fresnel Lens & Lenticular Screen
*X INCHES - Refer to the Tape Length in the table below
MODEL WD-52327 WD-62327
SCREEN SIZE 52 Inches 62 Inches
TAPE LENGTH 46.3 Inches 55.1 Inches
Page 19
MODEL: WD-52327 / WD-62327
ELECTRICAL ADJUSTMENTS
Note: Perform only the adjustments required. Do not attempt an alignment if proper equipment is not available.
Test Equipment
· · Oscilloscope (Unless otherwise specified, use 10:1 probes) Signal Generator (NTSC Color Bar)
Test Signals
A. Internally Generated Square Pattern Signals
B. Color Bar Signal
Use the color bar signal shown below, unless otherwise specified in this manual.
100% 75%
40%
40% 1H
Split-Field Color Bars (100% window) Page 20
MODEL: WD-52327 / WD-62327 Initial Setup
A. Option Menu Setup
Follow the steps below for the initial set-up: 1. Select the "MENU" display by pressing the "MENU" button once. 2. Press the number buttons "5", "7", "7", "0" in sequence to select the "OPTION MENU" display. 3. Press the "ADJUST" button to select "INITIALIZE." 4. Press "ENTER." NOTE: At this time channel 3 is automatically selected.
OPTION MENU