Mitsubishi Electronics WS-65513, WS-48613, WS-48513, WS-55513 Main Chassis Removal, DM Replacement

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The lightbox removal procedure for 48” V23 mod- els 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).

3Remove 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 exter- nal 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” ver- sions do not require the removal of the black plastic Back Cover. Refer to the Service Manual for spe- cific 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 1-2to 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 1-3to 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 PCB- DTV-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.

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Contents V23 Page 2003 Page Table of Contents Introduction ... New Technologies Disassembly and ServiceAlignment Procedures Power SupplyTroubleshooting Tips Video/Color CircuitrySync, Deflection and High Voltage Convergence CircuitryFeatures IntroductionFeatures NetCommand NetCommand IconsFormat Memory Card Reader Button FunctionPerfectColor CompatibilityMonitorLink Digital Visual Interface DVITransition Minimized Differential Signaling Tmds AcronymsSingle-Link Tmds Display Data Channel DDCHigh-bandwidth Digital Content Protection Hdcp Hot Plug Detect HPDMonitorLink DVI Connector DVI Input Block DiagramV23 Chassis DVI Input Block Diagram Service Menu Access Codes Chapter Disassembly and Service LightboxDM Replacement Main Chassis RemovalMain Chassis Removal PCB Locations Convergence IC Replacement PCB & Major Component LocationsV23+++ Cabinet Front Disassembly V23+++ Composite Cabinet BackOption Menu Initial Setup Chapter Alignment ProceduresInitial Setup Main Menu Default Settings Circuit Adjustment Mode Activating the Circuit Adjustment ModeSelection of adjustment Functions Adjustment Items Terminating the Circuit Adjustment ModeNEW FEATURE… Service Mode Reset Saving Adjustment DataConvergence Mode Functions Convergence Adjustment ModeActivating the HD mode when no HD signal is available Fine Convergence Mode Alignment Data Storage LocationsChapter Power Supply Low Energy ModeLow Energy Mode Activation Low Energy Standby RegulatorUser Setup Menu RegulationLow Energy Power Distribution Standard Standby Supply Start-upStandard Standby Supplies Time Shift Recording Power SuppliesStandby Power Distribution Time Shift Supply Power Distribution Switched Supplies Regulator Flashes-Stops-Flashes-Stops-etc TroubleshootingPower Distributions If the LED does not flash Page Chapter Control Circuitry Basic µPC RequirementsReset Circuitry Input Command Circuitry Page AC-OFF Input Serial Data LinesΜPC Parallel Inputs Short Detect RAY ProtectParallel Outputs BWC Band Width ControlFlash Circuit Chapter Video/Color Circuitry PCB-TERMINAL Video Path PCB-SIGNAL Video Path CRT Drive & Protect Circuitry Digital Signal Path Monitor Out Circuit Chapter Sync, Deflection & High Voltage Sync Signal Path VGAPage Page Vertical Deflection Horizontal DeflectionHorizontal Deflection DC Supply Circuitry Deflection Loss Detection HV & HV Regulation Ray Protect Page Convergence Circuitry Overall Block Diagram Chapter Convergence CircuitryWaveform Generator & D/A Converter Convergence Waveform Generator & D/A ConverterLPF & Summing Amps Low Pass Filter and Summing AmplifiersConvergence Output Circuitry Convergence Output CircuitryChapter Sound Circuitry DTV DVI VGAOverall Sound Circuitry Block Diagram Overall Sound Signal Path Digital Audio OutputPage Reading the Error Codes Chapter Troubleshooting TipsUsing The Front Panel LED CRT Phosphor Protection NetCommandTM Control ProblemsDM Module Check
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