Text preview for : 1-Service_Procedures.pdf part of Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 (Chassis V16 N W) (Training Manual + Schematic)



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Chapter 1 Service Procedures
Servicing models in the V16 chassis family is similar to previous Mitsubishi projection televisions. This chapter will familarize the service technician with: Cabinet Disassembly Procedures Lightbox Removal Procedures PCB Functions PCB and Major Parts Locations

For actual service, please refer to the Service Manual for more complete information, including the Safety Precautions and Product Safety Notice.

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CABINET DISASSEMBLY (FRONT VIEW)
VS-50805 / VS-60805 / WS-55805

Figure 1-1
1. Front Cabinet Disassembly
1. 2. 3. 4. Remove the Speaker Grille by pulling forward. Remove the Board Front by removing 4 screws (a). Remove the 3 screws (b) holding the Screen Assembly. Lift the Screen Assembly up and away from the cabinet.

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CABINET DISASSEMBLY (FRONT VIEW)
WS-55905 / WS-65905 / WS-73905

Figure 1-2
1a. Front Cabinet Disassembly
1. 2. 3. 4. 5. Remove the Cover Front and the two Speaker Grilles by pulling forward. Remove 2 screws (a) to remove the Control Panel. Remove the Board Front by removing 4 screws (b). Remove the 4 screws (c) holding the Screen Assembly. Lift the Screen Assembly up and away from the cabinet.

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CABINET DISASSEMBLY (FRONT VIEW)
WT-46805

Figure 1-3
1b. Front Cabinet Disassembly
1. 2. 3. 4. 5. Remove the Speaker Grille by pulling forward. Remove 2 screws (b) to remove the Control Panel. Remove the Board Front by removing 4 screws (a). Remove the 4 screws (c) holding the Screen Assembly. Lift the Screen Assembly up and away from the cabinet.

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CABINET DISASSEMBLY (REAR VIEW)
VS-50805 / VS-60805 / WS-55805 / WS-55905 / WS-65905 / WS-73905

Figure 1-4
2. Rear Cabinet Disassembly
1. 2. 3. 4. Remove 12 screws (a) holding the Back Board. Remove the 4 screws (c) holding each Board Shelf. Remove the 4 screws (b) securing the Light Box Assembly. Slide the Light Box out the rear of the Cabinet.

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CABINET DISASSEMBLY (REAR VIEW)
WT-46805

Figure 1-5
2a. Rear Cabinet Disassembly
1. 2. 3. 3. 4. Remove 15 screws (a) holding the Back Board. Remove the 13 screws (b) holding the Back Cover. Remove the 3 screws (d) securing each Board Shelf. Remove the 4 screws (c) securing the Light Box Assembly. Slide the Light Box out the rear of the Cabinet.

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Figure 1-6 shows the location of all PCBs attached to the main chassis. The primary functions of each PCB are listed below. PCB-SIGNAL NTSC Tuning uPC Control Low Voltage Regulation NTSC/SDTV Switching Interface for stand-up PCBs. PCB-TERMINAL Audio and Video Inputs DTV Interface Audio/Video Switch Audio signal processing PCB-AUDIO Audio Output Amplifier PCB-YCS / DECODER NTSC Luminance/Chroma Separation NTSC Chrominance Demodulation Matrix to YCrCb PCB-PIP/SCALAR PIP Processing Picture Size and Aspect Ratio Control PCB-DOUBLER Line Doubling

PCB Functions and Locations



PCB-RGB Red, Green and Blue Signal Processing DTV/DVD Signal Selection PCB-POWER Standby Power Supply Convergence Output Amps Vertical Output Amp Interface for stand up PCBs PCB-DEFL-JUNGLE Horizontal and Vertical Deflection Drive PCB-CONV-GEN Convergence and Raster Geometry Correction Signal Generation High Voltage Adjustment Generation Dynamic Focus Signal Generation Cross Hatch OSD Generation PCB-MAIN On-Off Power Switching Switched Power Supply Horizontal Deflection High Voltage Interface for stand up PCBs PCB-DEFL-MINI High Voltage Regulation Comparison X-Ray Protection Comparison PCB-DBF Corner Focus Correction

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Figure 1-6: PCB Locations

Figure 1-7: Main Component Locations
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