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VESA, DDC and EDID are trademarks of the Video Electronics Standard Association. TMDS is a trademark of Silicone Image, Inc. HDCP is a trademark of Digital Content Protection, LLC. 10 11 Figure 13: V23 Chassis DVI Input Block Diagram Chassis Option Menu Adjustment Mode Convergence Mode OSD Position VZ5/VZ6/V15 1-3-7-0 2-3-5-7 2-3-5-9 <6><5><4> Adjust Mode VZ7/VZ8/V16 1-2-7-0 1-2-5-7 1-2-5-9 <6><5><4> Adjust Mode V17 8-2-7-0 8-2-5-7 8-2-5-9 <6><5><4> Adjust Mode VZ9/V18/V19 0-1-7-0 0-1-5-7 0-1-5-9 <6><5><4> Adj. Mode/0-1-8-8 V20/VK20 2-2-7-0 2-2-5-7 2-2-5-9 <6><5><4> Adjust Mode V21 2-1-7-0 2-1-5-7 2-1-5-9 <6><5><4> 2-1-8-8 K20/V22/V23 0-3-7-0 0-3-5-7 0-3-5-9 <6><5><4> Adj. Mode/0-3-8-8 Service Menu Access Codes 12 1-1 Chapter 1 Disassembly and Service Figure 1-1: Lightbox Removal - 48” Models With 11 different models, mechanical features and disassembly procedures vary in the V23. Since all features and disassembly procedures are in the Service Manual, this chapter will only provide a general discussion. The V23 has the following mechanical features: • Removable Lightbox • Two piece cabinet (65” & 73” models) • Customer Removable DiamondShield™ • Composite Cabinet Back (V23+++) Lightbox Like previous Mitsubishi projection TV chassis, the V23 is based on a modular design that allows the “lightbox” to be removed for service. Even without the front control panel, card reader or front inputs, it is still fully functional by use of the remote control. This allows easier access to test points, etc. And, when “shop service” becomes necessary, this design has several more benefits. • No lifting of heavy, bulky cabinets • No cabinet or screen damage. • Less customer inconvenience. The lightbox removal procedure for 48” V23 models is shown in Figure 1-1. 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 screws (d). 3 Remove 4 screws (e) to remove the Board Slide. 4. Remove 8 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 IEE1394 connectors from the Card Reader to the DM. 8. Slide the Light Box Assembly from the cabinet. The procedure is similar for all models. The 48” versions do not require the removal of the black plastic Back Cover. Refer to the Service Manual for specific disassembly instructions on all models. NOTE: When V19, V21 and V23 models are first plugged in, the front panel LED will flash for about 1 minute indicating the “boot time” required before the Power On command will be recognized. In addition, V23 models have a “Energy Mode,” If set to Low, the 1 minute boot time does not start until after the Power on command is given. If the lightbox is being serviced without the front panel, no indication of these requirements will be present. Although not required, for the reasons noted, it is usually better to have the front panel connected when servicing the lightbox. If this is not possible, the following power up sequence should be used: 1) Apply AC power. 2) Press the remote Power button once. 3) Wait 90 seconds. 4) If no response, press the Power button again. 5) Wait 90 seconds. Main Chassis Removal Refer to Figure 1-2 to remove the Main Chassis. 1. Undo the cable wire ties to the Front Panel, Speakers, CRTs, etc. 2. Unplug the Card Reader USB and 1394 cables from the DM module. 2. Remove screw (a) securing the Main Chassis [and screws (b) in models WS-55813 and WS-65813] . 3. Release the Chassis Locks on each side of the chassis. 4. Slide the Chassis out the rear of the unit. 5. Tilt upward to access the bottom of the main chassis. DM Replacement Refer to Figure 1-3 to replace the DM assembly. 1. Unplug the Card Reader USB and 1394 cables from the DM module, and refer to the Chassis Removal Procedure to slide the chassis towards the rear of the set. 2. Remove screws (a), to remove the DM Rear Panel, Step 1. 3. Remove screws (a) and (b) to remove the DM Module Cover, Step 2. 3. Remove the E2P module from the original DM and plug it into the replacement DM. 5. Plug the DM module securely into the PCBDTV- TUNER. 6. Check operation before installing the DM Cover, Step 3. • Insert insulation (cardboard) between the Demodulator Ground Spring and the DM. • Plug the set in and check the operation. • If O.K., unplug the set and install the DM Cover. 1-2 1-3 Figure 1-2: Main Chassis Removal Figure 1-3: DM Replacement Step 1 Step 2 Step 3 REAR VIEW TOP VIEW TOP VIEW 1-4 Figure 1-4: PCB Locations Figure 1-5: Main Component Locations PCB-DTV Tuner DM PCB-MLINK PCB-Terminal PCB-Signal IR Learning NetCommand DVI Decoder A/V Inputs Control uPC DM Interface IEEE1394 RS-232C Interface A/V Selection Tuning DTV Tuner & Demodulator Interface Card Viewer 3D-Y/C VCJ OSD-Menus NTSC Video Decoders Convergenc...

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