KV-27HS420 - Sony TV Service Manual (repair manual). Page 2

Specifications ................................................................................. 4
Warnings and Cautions .................................................................. 6
Safety Check-Out ........................................................................... 7
Self-Diagnostic Function................................................................. 8

SECTION 1:  DISASSEMBLY................................................................11

1-1.  Rear Cover Removal.............................................................11
1-2.  Chassis Assembly Removal..................................................11
1-3.  Service Position ....................................................................11
1-4.  Picture Tube Removal.......................................................... 12
 

Anode Cap Removal Procedure........................................... 12

Cable Wire Dressing ............................................................ 13

SECTION 2:  SET-UP ADJUSTMENTS................................................ 22

2-1.  Beam Landing...................................................................... 22
2-2.  V-PIN and V-CEN Adjustment.............................................. 23
2-3.  Convergence........................................................................ 23

2-3.1.  Vertical and Horizontal Static Convergence ............ 23
2-3.2.  Operation of BMC (Hexapole) Magnet .................... 23
2-3.3.  TLH Plate Adjustment.............................................. 23
2-3.4.  Screen-Corner Convergence................................... 24
2-3.5.  Dynamic Convergence Adjustments........................ 24

2-4.  Focus Adjustment................................................................. 25

2-4.1.  Dynamic Focus/Dynamic Quadra-Pole Data........... 25

2-5.  Screen (G2).......................................................................... 26
2-6.  Picture Quality Adjustments ................................................. 26

2-6.1.  Video Input - Sub Contrast Adjustment.................... 26
2-6.2.  Video Input - Sub Hue/Sub Color Adjustment.......... 27
2-6.3.  RF Input - Sub Contrast Adjustment........................ 27
2-6.4.  RF Input - Sub Hue/Sub Color Adjustment.............. 28

2-7.  White Balance (CRT) and Sub Bright Adjustment................ 28

2-7.1.  Color Offset Adjustment Procedure ......................... 28

2-8.  H Raster Center Adjustment ................................................ 29
2-9.  Picture Distortion Adjustments ............................................. 29

2-9.1.  NTSC (DRC) Full Mode Adjustment ........................ 29
2-9.2.  1080i HD Mode Adjustment..................................... 30
2-9.3.  Vertical Compressed Mode Check and Confirmation 

(For 4x3 CRT Only) ................................................. 30

2-9.4  Normal, Zoom and Wide Zoom modes...................... 30

3-1.  Preparation Before Confirmation.......................................... 31

3-1.1  Hold-Down Operation Confirmation......................... 31

3-2.  B+ Max Confirmation ........................................................... 31
3-3.  B+ Voltage Check ................................................................ 31
3-4.  High Voltage (HV) Check ..................................................... 31
3-5.  Preparation for HV and Ik Protector Check.......................... 31
3-6.  HV Protector Check ............................................................. 31

3-6-1.  Cut Off Condition ..................................................... 31
3-6-2.  High Light Condition ................................................ 32

3-7.  Ik Protector Check................................................................ 32
3-8.  Hold Down Check ................................................................ 32
3-9.  Restoration........................................................................... 32
3-10. HV Service Flowchart........................................................... 33

HV Service Flowchart Table................................................. 34

SECTION 4:  CIRCUIT ADJUSTMENTS.............................................. 35

4-1.  Setting Service Adjustment Mode ........................................ 35

4-1.1.  Service Adjustment Mode In.................................... 35
4-1.2.  Service Adjustment Mode Memory.......................... 35
4-1.3.  Reading the Memory ............................................... 35
4-1.4.  Adjusting the Picture................................................ 35
4-1.5.  Resetting the Data................................................... 35
4-1.6.  Resetting the MID NVM Data .................................. 35
4-1.7.  Resetting the System NVM Data............................. 35
4-1.8.  Copy Function.......................................................... 35

4-2.  Memory Write Confirmation Method .................................... 36
4-3.  Remote Adjustment Buttons and Indicators......................... 36
4-4.  Service Data......................................................................... 37
4-5.  ID Map Table........................................................................ 60

SECTION 5:  DIAGRAMS..................................................................... 61

5-1.  Circuit Boards Location........................................................ 61
5-2.  Printed Wiring Boards and 

Schematic Diagrams Information......................................... 61

5-3.  Block Diagrams.................................................................... 62
5-4.  Schematics and Supporting Information .............................. 65

DZ Board Schematic Diagram (1 of 2)................................. 65
DZ Board Schematic Diagram (2 of 2)................................. 66
UY Board Schematic Diagram ............................................. 69
HBY Board Schematic Diagram........................................... 70
AY Board Schematic Diagram (1 of 2) ................................. 73
AY Board Schematic Diagram (2 of 2) ................................. 74
HCX Board Schematic Diagram........................................... 77
CH Board Schematic Diagram............................................. 79
HAX Board Schematic Diagram .......................................... 81
WY Board Schematic Diagram ............................................ 82
BY Board Schematic Diagram (1 of 4)................................. 84
BY Board Schematic Diagram (2 of 4)................................. 85
BY Board Schematic Diagram (3 of 4)................................. 86
BY Board Schematic Diagram (4 of 4)................................. 87
MY Board Schematic Diagram (1 of 4) ................................ 88
MY Board Schematic Diagram (2 of 4) ................................ 89
MY Board Schematic Diagram (3 of 4) ................................ 90
MY Board Schematic Diagram (4 of 4) ................................ 91
P Board Schematic Diagram ............................................... 94
PA Board Schematic Diagram ............................................. 95

5-5.  Semiconductors (1 of 2)....................................................... 96
 

Semiconductors (2 of 2)....................................................... 97

SECTION 6:  EXPLODED VIEWS........................................................ 98

6-1.  Chassis (KV-27HS420/29DRC420) ..................................... 98
6-2.  Picture Tube (KV-27HS420/29DRC420).............................. 99
6-3.  Chassis (KV-30HS420/34HS420) ...................................... 100
6-4.  Picture Tube (KV-30HS420/34HS420)............................... 101
6-5.  Chassis (KV-32HS420/36HS420) ...................................... 102
6-6.  Picture Tube (KV-32HS420/36HS420)............................... 103

SECTION  7:  ELECTRICAL PARTS LIST......................................... 104