Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
V23+++ MODELS
WS-55813
WS-65813
SPECIFICATIONS
• Power Input: AC 120V, 60Hz
• Power Usage: 275W
300W [WS-65813/ WS-73513/
WS-73713 only]
This service manual provides service instructions for the V23, V23+, v23++ and V23+++ PTV chassis types. The
specific models for each chassis type are listed below. Service personnel should read this manual thoroughly before
servicing these 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 printed circuit boards (PCBs).
4. CRT replacement procedure.
5. Electrical adjustments.
6. Chip parts replacement procedures.
7. Circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinet and screen parts.
2. Electrical parts.
Schematic and block diagrams of the above listed models are included in this service manual for better understanding of the circuitry. PCB drawings are also included for easy location of parts and test points.
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 in the parts data base and by bold
type in the parts list of this service manual. The replacement for any safety part should be identical in value
and characteristics.
NOTICE:Observe all cautions and safety related notes located inside the receiver cabinet and on the
receiver chassis.
WARNING:
1.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.
2.Do not install, remove or handle the picture tubes in any manner unless shatterproof goggles are
worn. People not so equipped should be kept away while the picture tube is being handled. Keep
the picture tube away from the body while handling.
3.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.
X-Radiation warning
The surface of the cathode ray tubes (CRTs) may generate X-Radiation, so take proper precautions when servicing. It is recommended that a lead apron be used for shielding while handling the CRT. Use this method if
possible.
When replacing the CRTs, use only the designated replacement part since it is a critical component with regard to
X-Radiation. High voltage must be set as prescribed under the section titled Electrical Adjustments.
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).
1. Remove the Back Board by removing 7 screws (a), 2 screws (b) and 8 screws (c).
2. Remove the Back Cover by removing 8 screw (d).
3Remove 4 screws (e) to remove the Board Slide.
4. Remove screws (f) to remove the Board Shelves.
5. Remove screw (g) holding the chassis.
6. Remove 4 screws (h) securing the Light Box Assembly.
7. Be certain that all cables and connectors between the Light Box Assembly and external items are
disconnected (e.g. speaker plugs, etc.), including the USB and 1394 connectors from the Card Reader to
the DM Module.
1. Remove screws (a), (b) and (c) holding the Back Board.
2. Remove 4 screws (d) holding the Board Slide
3. Remove the 4 screws (e) holding each Board Shelf.
4. Remove screw (g) holding the chassis.
5. Remove 4 screws (f) securing the Light Box Assembly.
6. Be certain that all cables and connectors between the Light Box Assembly and external items are
disconnected (e.g. speaker plugs, etc.), including the USB and 1394 cables from the Card Reader.
7. Slide the Light Box out the rear of the Cabinet.
1. Remove screws (a), (b) and (c) holding the Back Board.
2. Remove 4 screws (d) holding the Board Slide
3. Remove the 5 screws (e) holding each Board Shelf.
4. Remove screw (f) and 3 screws (g) securing the Light Box Assembly.
5. Be certain that all cables and connectors between the Light Box Assembly and external items are
disconnected (e.g. speaker plugs, etc.), including the USB and 1394 cables from the Card Reader..
6. Slide the Light Box out the rear of the Cabinet.
1. Remove screws (a), (b) and (c) holding the Back Board.
2. Remove the 2 screws (d) holding the Board Slide.
3. Remove the 3 screws (e) and 2 screws (f) securing the Light Box Assembly.
4. Disconnect cabling to the front panel (Control Panel, Speakers, Inputs, etc.), including the USB and 1394
cables from the Card Reader to the DM Module.
4. Slide the Light Box out the rear of the Cabinet.
2.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 front edge of the Fresnel Lens
as shown below. Refer to the Table below for proper tape length.
2. Place the Fresnel Lens on top of the Lenticular Screen and apply pressure at the top edge
to bond them together as shown below.
The appropriate disassembly procedure given below.
Note: Wear gloves when handling the DiamondShield™ to prevent finger prints.
1. Gently insert a small plastic card (such as a
credit card or a plastic putty knfe) between the
DiamondShield™ and one end of the clip to pry
the clip loose.
2. Remove both clips by pulling them toward you.
3. Carefully insert the small plastic card (or plastic
putty knife) into the gap at the side/center point
of the Shield and pull the Shield slightly away
from the unit. Place your hands at the points
shown and gently bow the Shield toward you
and remove from the unit.
2.DiamondShield™ Installation Procedure
*(See the Parts List for DiamondShield™ part numbers)
To install the DiamondShieldTM, reverse the above Removal Procedure.
Mitsubishi 65 and 73 inch Projection TVs have been assembled in two pieces. These pieces may be separated for
easier delivery and setup. The cabinet separation procedure requires two persons and varies between models.
WS-65813 Cabinet Separation Procedure
Figure 1
1. Remove the Speaker Grille by pulling forward.
2. Remove the two Front Cover screws (a).
3. To remove the Front Cover, slide to the right
approximately 1/2”, then pull away from the TV.
Figure 2
4. Remove Screw (b) from the front board.
5. Disconnect the LF connector.
Figure 3
6. Remove screw (c) on each side of the cabinet.
7. Remove the plastic cover on each side.
Figure 4
8. Slide the top of the cabinet top forward.
Figure 5
9. Carefully lift the cabinet top until the interlock
tabs clear the cabinet bottom