Smettere di rottami elettronici - ripararlo da solo

This service manual provides service instructions for PTV Models WT-46807, WS-55807 and WS-65807 which
use the V17 chassis, PTV Models WS-559857, and WS-65857 which use the V17+ chassis, and PTV Models
WS-55907, WS-65907 and WS-73907 which use the V17++ chassis. 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 under-
standing of the circuitry. PCB drawings are also included for easy location of parts and test points.

PART 2
SCHEMATIC DIAGRAMS

Overall PCB Block Diagram ...................................... 1
PCB-POWER............................................................. 2
PCB-MAIN ................................................................. 3
PCB-SIGNAL (AV/I-O) .............................................. 4
PCB-SIGNAL (MICRO) ............................................. 5
PCB-SIGNAL (VC/SW) ............................................. 6
PCB-2HDW (IN) ........................................................ 7
PCB-2HDW (MAIN) ................................................... 8
PCB-2HDW (OUT) .................................................... 9
PCB-TERMINAL ...................................................... 10
PCBs - CONV. GEN./JUNGLE ................................ 11
PCB-3DYC/MAIN DECODER .................................. 12
PCBs - CRT/CONTROL/PREAMP/DBF/
FRONT/DISPLAY ........................................ 13
PCB-BMP (1)........................................................... 14
PCB-BMP (2)........................................................... 15
PCB LAYOUT DIAGRAMS....................................... 16

Refer to PART 1 for:
• Specifications
• Safety Precautions
• Disassembly
• CRT Replacement
• Electrical Adjustments
• Parts List
• Block Diagrams

This service manual provides service instructions for PTV Models WT-46807, WS-55807 and WS-65807 which
use the V17 chassis, PTV Models WS-559857, and WS-65857 which use the V17+ chassis, and PTV Models
WS-55907, WS-65907 and WS-73907 which use the V17++ chassis. 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

INTRODUCTION ............................................................................................................................... 5
PRODUCT SAFETY NOTICE ........................................................................................................... 5
SAFETY PRECAUTIONS ................................................................................................................. 6
DISASSEMBLY
Cabinet Disassembly (Front View)
WT-46807 ..................................................................................................................................... 7
WS-55807 / WS-65807 .................................................................................................................. 8
WS-55857 / WS-65857 .................................................................................................................. 9
WS-55907 / WS-65907 / WS-73907............................................................................................ 10
Cabinet Disassembly (Rear View)
WT-46807 ................................................................................................................................... 11
WS-55807 / WS-55857 / WS-55907 / WS-65807 / WS-65857 /
WS-65907 / WS-73907 ................................................................................................................ 12
Cabinet Separation Procedure WS-65807 / WS-65857 / WS-65907 / WS-73907 ....................... 13
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
Lenticular Screen and Fresnel Lens Removal
WS-55807 / WS-65807 ....................................................................................................... 14
WS-55857 / WS-55907 / WS-65857 / WS-65907 / WS-73907 / WT-46807 ...................... 15
Lenticular Screen and Fresnel Lens Installation .................................................................... 16
SERVICING THE DIAMONDSHIELDTM r
DiamondShieldTM Removal / Installation ...................................................................................... 17
SERVICING PCBs
PCB Locations and Chassis Removal ......................................................................................... 18
Main Component Locations ......................................................................................................... 18
CRT REPLACEMENT
CRT Removal .............................................................................................................................. 19
CRT Installation ........................................................................................................................... 20
ELECTRICAL ADJUSTMENTS
Test Equipment ............................................................................................................................ 22
Initial Setup ................................................................................................................................. 22
Self Diagnostics ........................................................................................................................... 24
Circuit Adjustment Mode .............................................................................................................. 24
Convergence Adjustment Mode ................................................................................................... 26
E2PROM Replacement................................................................................................................ 28
Adjustment Items List .................................................................................................................. 28
Adjustment Test Points ................................................................................................................ 31
Adjustment Procedures ................................................................................................................ 32
Audio Circuit ....................................................................................................................... 32
High Voltage Regulation ..................................................................................................... 33
Main/Sub Y Level................................................................................................................ 33
Side by Side Sub Picture Tint ............................................................................................. 34
Side by Side Sub Picture Color .......................................................................................... 34
CRT Cutoff .......................................................................................................................... 35
White Balance (NTSC) ....................................................................................................... 35
White Balance (HD) ............................................................................................................ 36
Cb, Cr Offset ....................................................................................................................... 36
Black Level ......................................................................................................................... 37
Sub Contrast ....................................................................................................................... 37
Dynamic Focus Preset ........................................................................................................ 38
Electrostatic Focus.............................................................................................................. 38
Lens Focus.......................................................................................................................... 39
Character Position .............................................................................................................. 39
Deflection/Convergence Geometry Presets........................................................................ 40
Deflection Circuit Geometry Adjustments ........................................................................... 41
Convergence Circuit Geometry Adjustments ...................................................................... 42
Centering and Static Convergence ..................................................................................... 43
Coarse Convergence Adjustments ..................................................................................... 44
Fine Convergence Adjustments .......................................................................................... 45
CHIP PARTS REPLACEMENT ....................................................................................................... 46
REPLACEMENT PARTS
Parts Ordering .............................................................................................................................. 47
Critical and Warranty Parts Designation ...................................................................................... 47
Parts Tolerance Codes ................................................................................................................. 47
Quick Reference List ................................................................................................................... 48
Service Parts List ......................................................................................................................... 49
CIRCUITRY BLOCK DIAGRAMS
Standby Supply Regulator ........................................................................................................... 66
Switched Supply Regulator .......................................................................................................... 67
Video / Color A/V Switch Circuit .................................................................................................. 68
Video / Color Signal Path ............................................................................................................. 69
Sync Signal Path ......................................................................................................................... 70
Deflection / HV ............................................................................................................................. 71
X-Ray Protect.............................................................................................................................. 71
Sound Circuit ............................................................................................................................... 72
Convergence............................................................................................................................... 73
Control Circuit .............................................................................................................................. 74
Section 2 .... Schematic Diagrams
SCHEMATIC DIAGRAMS
Overall Block Diagram ................................................................................................................... 1
PCB-POWER................................................................................................................................ 2
PCB-MAIN .................................................................................................................................... 3
PCB-SIGNAL (AV/I-O .................................................................................................................... 4
PCB-SIGNAL (MICRO) .................................................................................................................. 5
PCB-SIGNAL (VC/SW) .................................................................................................................. 6
PCB-2HDW (IN)............................................................................................................................ 7
PCB-2HDW (MAIN) ....................................................................................................................... 8
PCB-2HDW (OUT)......................................................................................................................... 9
PCB-TERMINAL .......................................................................................................................... 10
PCB-CONVERGENCE GENERATOR/JUNGLE.......................................................................... 11
PCB-3DYC/MAIN DECODER ...................................................................................................... 12
PCBs - CRT/CONTROL/PREAMP/DBF/FRONT/DISPLAY ......................................................... 13
PCB-BMP (1) ............................................................................................................................... 14
PCB-BMP (2) ............................................................................................................................... 15
PCB LAYOUT DIAGRAMS ............................................................................................................. 16