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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, in-
cluding the Safety Precautions and Product Safety Notice.
Page 1-1
Page 1-2
CABINET DISASSEMBLY (FRONT VIEW)
VS-50805 / VS-60805 / WS-55805
Figure 1-1
1. Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Board Front by removing 4 screws (a).
3. Remove the 3 screws (b) holding the Screen Assembly.
4. Lift the Screen Assembly up and away from the cabinet.
Page 1-3
CABINET DISASSEMBLY (FRONT VIEW)
WS-55905 / WS-65905 / WS-73905
Figure 1-2
1a. Front Cabinet Disassembly
1. Remove the Cover Front and the two Speaker Grilles by pulling forward.
2. Remove 2 screws (a) to remove the Control Panel.
3. Remove the Board Front by removing 4 screws (b).
4. Remove the 4 screws (c) holding the Screen Assembly.
5. Lift the Screen Assembly up and away from the cabinet.
Page 1-4
CABINET DISASSEMBLY (FRONT VIEW)
WT-46805
Figure 1-3
1b. Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove 2 screws (b) to remove the Control Panel.
3. Remove the Board Front by removing 4 screws (a).
4. Remove the 4 screws (c) holding the Screen Assembly.
5. Lift the Screen Assembly up and away from the cabinet.
Page 1-5
CABINET DISASSEMBLY (REAR VIEW)
VS-50805 / VS-60805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
Figure 1-4
2. Rear Cabinet Disassembly
1. Remove 12 screws (a) holding the Back Board.
2. Remove the 4 screws (c) holding each Board Shelf.
3. Remove the 4 screws (b) securing the Light Box Assembly.
4. Slide the Light Box out the rear of the Cabinet.
Page 1-6
CABINET DISASSEMBLY (REAR VIEW)
WT-46805
Figure 1-5
2a. Rear Cabinet Disassembly
1. Remove 15 screws (a) holding the Back Board.
2. Remove the 13 screws (b) holding the Back Cover.
3. Remove the 3 screws (d) securing each Board Shelf.
3. Remove the 4 screws (c) securing the Light Box Assembly.
4. Slide the Light Box out the rear of the Cabinet.
Page 1-7
PCB Functions and Locations PCB-RGB
Figure 1-6 shows the location of all PCBs attached Red, Green and Blue Signal Processing
to the main chassis. The primary functions of each DTV/DVD Signal Selection
PCB are listed below.
PCB-POWER
PCB-SIGNAL Standby Power Supply
NTSC Tuning Convergence Output Amps
uPC Control Vertical Output Amp
Low Voltage Regulation Interface for stand up PCBs
NTSC/SDTV Switching
Interface for stand-up PCBs. PCB-DEFL-JUNGLE
Horizontal and Vertical Deflection Drive
PCB-TERMINAL
Audio and Video Inputs PCB-CONV-GEN
DTV Interface Convergence and Raster Geometry Correction
Audio/Video Switch Signal Generation
Audio signal processing High Voltage Adjustment Generation
Dynamic Focus Signal Generation
PCB-AUDIO Cross Hatch OSD Generation
Audio Output Amplifier
PCB-MAIN
PCB-YCS / DECODER On-Off Power Switching
NTSC Luminance/Chroma Separation Switched Power Supply
NTSC Chrominance Demodulation Horizontal Deflection
Matrix to YCrCb High Voltage
Interface for stand up PCBs
PCB-PIP/SCALAR
PIP Processing PCB-DEFL-MINI
Picture Size and Aspect Ratio Control High Voltage Regulation Comparison
X-Ray Protection Comparison
PCB-DOUBLER
Line Doubling PCB-DBF
Corner Focus Correction
Page 1-8
Figure 1-6: PCB Locations
Figure 1-7: Main Component Locations
Page 1-9
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