Toshiba 50WP16A User manual

SERVICE MANUAL
PRINTED IN JAPAN Oct.,2001
P
FILE NO. 050-200122
50WP16A, 50WP16C
50WP16H, 50WP16R
50WP16EA, 50HP81
PLASMA DISPLAY MONITOR

1 Plasma Display Technology 4
1.1. Plasma display panel 4
1.2. Plasma display panel structure 4
1.3. Rear Glass Structure 4
1.4. Front Glass Structure 4
1.5. Pixel Structure 5
1.6. Sub Field Drive system 5
1.7. Initialization 5
1.8. Write 5
1.9. Wall Voltage 6
1.10. Sustain Step 1 6
1.11. Sustain Step 2 6
1.12. Sustain Step 3 6
1.13. Sustain Step 4 7
1.14. Sustain Step 5 7
1.15. Repeat Step 1 to Step 5 7
1.16. Sub-Field drive 7
1.17. Dual Scan 8
1.18. Plasma AI (Adaptive brightness Intensifier) 8
1.19. Real Black drive 8
2 Service Hint 9
3 Adjustment Procedure 10
3.1. +B Set-up 10
3.2. Driver Set-up 10
3.3. Adjustment Volume Location 11
3.4. Test Point Location 11
3.5. Initialization Pulse Adjust 12
4 Alignment Setting 13
4.1. How to access Alignment 13
4.2. Exit 13
4.3. IIC menu structure 14
5 Alignment 16
5.1. DG contrast 16
5.2. DVCO adjust 16
5.3. NTSC panel white balance 17
5.4. PAL/SECAM panel white balance 18
5.5. Pedestal setting 20
5.6. PC/RGB panel white balance 21
5.7. HD/ 525i /525p panel white balance 23
5.8. 625i panel balance 25
5.9. Sub brighness setting 26
5.10. Pos./Size setting 28
5.11. Panel APL/ABL 28
5.12. SG Hold 28
5.13. Aging 28
5.14. LSI 33 Adjust 28
5.15. CAT (Computer Aided Test) mode 28
6SelfCheck 29
6.1. Display Indication 29
7 Trouble shooting guide 30
7.1. No Power 30
7.2. No Picture 31
7.3. Local screen failure 31
8 P.C.B. (Printed Circuit Board) exchange 32
8.1. Caution 32
8.2. Quick adjustment after P.C.B. exchange 32
9 Location of Lead Wiring 33
10 Basic Circuit Explanation 34
10.1. Power Supply Circuit 34
10.2. Energy Recovery Drive Pulse Output 35
11 IC Block Diagram 36
12 Conductor Views 39
12.1. F-Board 39
12.2. P1-Board 40
12.3. P4-Board 43
12.4. P3, P5, P6, P7, P8, P9 and T11-Board 45
12.5. H, H3, S1 and V1-Board 47
12.6. DG-Board 50
12.7. D-Board 52
12.8. C1-Board 55
12.9. C2-Board 56
12.10. C3-Board 57
12.11. C4-Board 58
12.12. C5-Board 59
12.13. C6-Board 60
12.14. C7-Board 61
12.15. C8-Board 62
12.16. SC-Board 63
12.17. SD-Board 66
12.18. SU-Board 67
12.19. SS, SS2 and SS3-Board 68
13 Block and Schematic Diagrams 71
13.1. Schematic Diagram Notes 71
13.2. Main Block Diagram 72
13.3. Power (F, P1, P3, P4, P5, P6, P7, P8 and P9 Board)
Block Diagram 73
13.4. P1-Board (1/2) Schematic Diagram 74
13.5. P1-Board (2/2) Schematic Diagram 75
13.6. P3 and P4-Board Schematic Diagram 76
13.7. P5, P6, P7 and P8-Board Schematic Diagram 77
13.8. P9 and F-Board Schematic Diagram 78
13.9. H-Board Block Diagram 79
CONTENTS Page Page
2

13.10. H-Board (1/4) Schematic Diagram 80
13.11. H-Board (2/4) Schematic Diagram 81
13.12. H-Board (3/4) Schematic Diagram 82
13.13. H-Board (4/4) Schematic Diagram 83
13.14. DG Board Block Diagram 84
13.15. DG-Board (1/4) Schematic Diagram 85
13.16. DG-Board (2/4) Schematic Diagram 86
13.17. DG-Board (3/4) Schematic Diagram 87
13.18. DG-Board (4/4) Schematic Diagram 88
13.19. T11 Board Schematic Diagram 89
13.20. D-Board IC Location 90
13.21. D-Board Information (1/4) 91
13.22. D-Board Information (2/4) 92
13.23. D-Board Information (3/4) 93
13.24. D-Board Information (4/4) 94
13.25. D-Board Block Diagram 95
13.26. D-Board (1/36) Schematic Diagram 96
13.27. D-Board (2/36) Schematic Diagram 97
13.28. D-Board (3/36) Schematic Diagram 98
13.29. D-Board (4/36) Schematic Diagram 99
13.30. D-Board (5/36) Schematic Diagram 100
13.31. D-Board (6/36) Schematic Diagram 101
13.32. D-Board (7/36) Schematic Diagram 102
13.33. D-Board (8/36) Schematic Diagram 103
13.34. D-Board (9/36) Schematic Diagram 104
13.35. D-Board (10/36) Schematic Diagram 105
13.36. D-Board (11/36) Schematic Diagram 106
13.37. D-Board (12/36) Schematic Diagram 107
13.38. D-Board (13/36) Schematic Diagram 108
13.39. D-Board (14/36) Schematic Diagram 109
13.40. D-Board (15/36) Schematic Diagram 110
13.41. D-Board (16/36) Schematic Diagram 111
13.42. D-Board (17/36) Schematic Diagram 112
13.43. D-Board (18/36) Schematic Diagram 113
13.44. D-Board (19/36) Schematic Diagram 114
13.45. D-Board (20/36) Schematic Diagram 115
13.46. D-Board (21/36) Schematic Diagram 116
13.47. D-Board (22/36) Schematic Diagram 117
13.48. D-Board (23/36) Schematic Diagram 118
13.49. D-Board (24/36) Schematic Diagram 119
13.50. D-Board (25/36) Schematic Diagram 120
13.51. D-Board (26/36) Schematic Diagram 121
13.52. D-Board (27/36) Schematic Diagram 122
13.53. D-Board (28/36) Schematic Diagram 123
13.54. D-Board (29/36) Schematic Diagram 124
13.55. D-Board (30/36) Schematic Diagram 125
13.56. D-Board (31/36) Schematic Diagram 126
13.57. D-Board (32/36) Schematic Diagram 127
13.58. D-Board (33/36) Schematic Diagram 128
13.59. D-Board (34/36) Schematic Diagram 129
13.60. D-Board (35/36) Schematic Diagram 130
13.61. D-Board (36/36) Schematic Diagram 131
13.62. C1, C2, C3, C4, C5, C6, C7 and C8 Board Block Diagram
132
13.63. C1-Board Schematic Diagram 133
13.64. C2-Board Schematic Diagram 134
13.65. C3-Board Schematic Diagram 135
13.66. C4-Board and V1-Board Schematic Diagram 136
13.67. C5-Board Schematic Diagram 137
13.68. C6-Board Schematic Diagram 138
13.69. C7-Board Schematic Diagram 139
13.70. C8-Board Schematic Diagram 140
13.71. SC-Board Block Diagram 141
13.72. SC-Board (1/2) Schematic Diagram 142
13.73. SC-Board (2/2) Schematic Diagram 143
13.74. SD-Board (1/2) Schematic Diagram 144
13.75. SD-Board (2/2) Schematic Diagram 145
13.76. SU-Board (1/2) Schematic Diagram 146
13.77. SU-Board (2/2) Schematic Diagram 147
13.78. SS, SS2 amd SS3 Board Block 148
13.79. SS-Board (1/2) Schematic Diagram 149
13.80. SS-Board (2/2) SS2-Board, SS3-Board and S1-Board
Schematic Diagram 150
14 Panel drive signal wave form 151
15 Signal Waveform 152
16 Mechanical Parts Location 153
17 Mechanical Replacement Parts List 155
18 Replacement Parts List 156
18.1. Relpacement Parts List Notes 156
18.2. Electrical Replacement Parts List 157
19 Specifications 180
3

1.1. Plasma display panel
Fig. A
Toshiba 50 wide plasma display panel is develope for large
screen multimedia display with space saving.
The plasma display panel use AC type Sub-field drive system
with Dual scanning system.
This panel have also Asymmetric cell and Plasma AI
technology.
Fig. A Is the CRT and Plasma Display Panel(PDP) comparison
chart.
1.2. Plasma display panel structure
Fig. B
Plasma display panel structure
Plasma display panel is consist of front glass, rear glass and
Aluminum base.
The front glass has each 768 lines scan and sustain
transparence electrodes.
The rear glass has 4098 (1366 x 3 ) data electrodes on the
inner surface. These electrodes are connected to the data drive
circuit boards directory.
1.3. Rear Glass Structure
Fig. C
On the rear glass the data electrode is mounted.
The dielectric is coated on the rear glass.
Red, Green and Blue colour phosphors are formed on the data
electrode with the ribs. However to improve colour reproduction
and brightness, each colour phosphors are formed different
width This is called " Asymmetrical cell ".
1.4. Front Glass Structure
Fig. D
On the front glass scan and sustain transparent electrodes are
mounted in pair.
The dielectrics is coated on the front grass.
MgO over coat is also applied on the dielectrics.
The front and rear glasses are piled and sealed . And low
presser gas are charged between two glasses.
1 Plasma Display Technology
4

1.5. Pixel Structure
Fig. E
50 inch plasma display panel has 1,049,088 pixels.
Each pixels structure is shown fig. E.
1.6. Sub Field Drive system
Fig. F
Brightness control of plasma display panel is carried out by
plasma discharge time change. To control each pixelís
brightness Sub-field drive system is used.
A sub-field is consist of Initialize, Write and sustain operation.
1.7. Initialization
Fig. G
To clear any remaining electric charge into the pixel, trapezoid
voltage is applied between the scan and sustain electrodes.
Plasma discharge is started but the discharge become small
gradually.
Then any electric charge is cleared.
1.8. Write
Fig. H
Data Pulse which is positive polarity is input to data electrode
and Scan pulse which is negative polarity is input to scan
electrode simultaneously.
That means sum of data and scan pulses voltage is applied
between two electrodes as discharge start voltage.
Discharge is started into the pixel and gas is ionized.
During discharging Ion is charged on the scan electrode side
and electron is charged on data electrode side.
5

1.9. Wall Voltage
Fig. I
When input pulses are stopped, Ions and Electrons which are
charged on the dielectric around the electrodes are remained.
This charge is called Wall Voltage (Pilot voltage).
This operation is called Write .
1.10. Sustain Step 1
Fig. J
Negative polarityís Sustain pulse is input between sustain and
scan electrodes and voltage potential between two electrodes
becomes sum of Sustain pulse and wall voltage.
Then discharge start.
1.11. Sustain Step 2
Fig. K
When sustain pulse is stopped, Ions and Electrons are
remained again as Wall voltage. However polarity of wall
voltage is reversed.
1.12. Sustain Step 3
Fig. L
Positive polarity´s Sustain pulse is input between sustain and
scan electrodes and discharge start again.
6

1.13. Sustain Step 4
Fig. M
When sustain pulse is stopped, Ions and Electrons are
remained again as Wall voltage. However polarity of wall
voltage is reversed.
1.14. Sustain Step 5
Fig. N
Ions and Electrons which is generated by 2nd sustain
discharge are charged on the pixel wall(dielectric) around the
electrodes.
1.15. Repeat Step 1 to Step 5
Fig. O
To keep discharge continuously step 1 to 5 operation will be
repeated.
As the result sustain pulse is alternated. Therefore we call this
drive system AC Drive type.
If sustain operation is repeated longer, brightness level of the
pixel is increased. Therefore depend on sustain discharge time
brightness of pixel is controlled.
1.16. Sub-Field drive
Fig. P
Sub-Field drive is PDP unique system.
While one TV field period, 8 bits digital video signal component
is reproduced by 8 sub-fields operation.
Each Sub-Field´s address period are all same.(Consist of one
initialization and 768 scanning operation)
But Sustain period of each Sub-Field are different.1st Sub-
Field(SF) reproduce only 1 step brightness.
2nd SF reproduce 2 steps brightness.
Each sub-field´s sustain period are increased gradually.
However total 256 brightness difference can be reproduced on
the screen.
7

1.17. Dual Scan
Fig. Q
The sustain period of sub-field drive system. Therefore
brightness peak is limited. Because 768 horizontal lines
scanning is carried out during address period.
Dual scan system can reduce scanning time from 768 to 384 in
the address period.
Then spaced time by dual scanning can be used for sustain
operation.
As the result Brightness peak level can be increased.
1.18. Plasma AI (Adaptive
brightness Intensifier)
Fig. R
Plasma AI control sub-field drive operation which is called
Multi-Sprit Sub-Field drive control system.
Depend on the picture contents ( APL : Average Picture Level
) sustain time format of each sub-field are also rearranged from
binary format to linear cording sustain time. (Linear coding sub-
field)
Plasma AI select the best display condition for Plasma display
panel to display natural and crisp picture.
1.19. Real Black drive
Fig. S
For standard sub field drive, initialization discharge is done at
each sub field. So that during one TV field period same sub
field numbers of discharges are done even black signal was
displayed.
Therefore there are small emission at the black area.
The Real Black drive system improve black reproduction.
Initialization discharge is done at first sub field only.
Remaining sub field are not required discharge because Real
Black drive circuit applies initialization electric field remainder
pulse.
8

2 Service Hint
Baord name Function Board name Function
C1 Data drive (Upper Left) P4 Panel drive power
C2 Data drive (Upper Center) P5 Processing voltage control
C3 Data drive (Upper Right) P6 PFC oscillator
C4 Data drive (Lower Left) P7 High Voltage protect
C5 Data drive (Lower Center) P8 Low Voltage protect
C6 Data drive (Lower Right) P9 Regulator
C7 Saving power S1 Power switch
C8 Saving power SC Scan drive
DDigital process & control SD Scan drive output (Lower)
DG RGB/IF SS Sustain drive
FLine Filter SS2 Sustain connection (Upper)
FLine Filter SS3 Sustain connection (Lower)
HRear terminal SU Scan drive output (Upper)
H3 Speaker terminal T11 Interface
P1 Power supply V1 Front switch & Remote Receiver
P3 Sustain voltage control
9

3.1. +B Set-up
3.1.1. Item / Preparation
1.Confirm the main voltage set switch Is set to 230V. (A, B,
and E version) Confirm the main voltage set switch is set to
110V. (U version)
Note:
230V covers input AC voltage from 200V till 260V, and
110V covers from 90V till 130V.
2.Input a Grey scale signal.
3.Set the picture controls: -
Picture mode: Normal
White balance: Normal
3.1.2. Adjustments
Adjust and confirm indicated test point for the specified voltage.
Test point Voltage Volume Name
P4 pin 1 (Hot) 400V ±1V R548 PFC
Confirmation (Cold)
P27 pin 5 16V ±0.5V +15V
D5 pin 1 14V ±0.5V +13.5V
DG6 pin 1 14V ±0.5V Audio15V
DG6 pin 3 -14V ±0.5V Audio-15V
D5 pin 5 5.2V ±0.3V +5.25V
D5 pin 8 3.6V ±0.2V +3.65V
D7 pin 4 5V ±0.3V STB5V
3.2. Driver Set-up
3.2.1. Item / Preparation
1.Input an APL 100 % white signal.
2.Set the picture controls: -
Picture mode: Normal
White balance: Cool
Aspect: 16:9
3.2.2. Adjustments
Adjust driver section voltages referring the panel data on the
panel data label.
Test point Voltage Volume Name
TPVSUS
(SS-BOARD) VSUS ±1V R639(P3-BOARD) Vsus
TPVBK
(SC-BOARD) 140 V ±5V R513(P1-BOARD) Vbk
TPVE
(SS-BOARD) VE ±0.5V R6829(SS-BOARD) Ve
TPVSET
(SC-BOARD) 224 V ±1V R6490(SC-BOARD) Vset
TPVAD
(SC-BOARD) VAD ±1V R960(P4-BOARD) Vad
P27 pin2 (P1-
BOARD 75 V ±0.5V R528 (P1-BOARD) Vda
Between TPVscn
and TPVAD
(SC-BOARD)
120 + (Vad)
±0.5V R967 (P4-BOARD) Vscan
3 Adjustment Procedure
10

3.3. Adjustment Volume Location
3.4. Test Point Location
11

3.5. Initialization Pulse Adjust
1.Input a Cross hatch signal.
2.Set the picture controls: -
Picture mode: Normal
White balance: Cool
Adjust the indicated test point for the specified wave form.
Test point Volume
TPSC1 (SC) R6524 (SC) 20 ± 10µ Sec
TPSC1 (SC) R6556 (SC) 160 ± 20µ Sec
12

4 Alignment Setting
4.1. How to access Alignment
1.Press and hold the Volume down / - button on the front panel of the unit and press the status [ + ]button on the remote
control 3 times quickly within 1 second, this will place the unit into the CAT menu (Main service mode)
2.Press the Access button on the remote control.
4.2. Exit
1.To exit the IIC mode,presstheRbutton on the remote control.
2.To exit the CAT mode, access the ID mode by the down button of cross buttons and switch off the main power and on again.
13

4.3. IIC menu structure
14

15

5 Alignment
5.1. DG contrast
(Composit video signal)
Subject Item
1 NTSC Oscilloscope TP8004 VPC SETTING DG CONTRAST 0.7V+-0.02V
Colour Bar (3A)
2 PAL Oscilloscope TP8004 VPC SETTING DG CONTRAST 0.55V+-0.02V
Colour Bar (3A)
INPUT Equipment Test Point Level Remark
Alignment menu
100IRE
(DG Boad)
(DG Board)
5.2. DVCO adjust
Subject Item
1 NTSC or PAL - - VPC SETTING DVCO SETTING 1) Access to DVCO SETTING mode.
Colour Bar
Standard signal 2) Press ACCESS key on remote then automatic
DVCO setting is started.
3) When data becomes " 1 "adjustment is completed. .
* Do not use this function without input signal.
ProcedureINPUT Equipment Test Point Alignment menu
16

5.3. NTSC panel white balance
1 NTSC Color Picture: 1) Find the nearest area to brightness of 10 cd/m 2 as Low
Gray Scale Analyzer Normal Sub Adjust light by color sensor.
Pattern White balance: Sub Bright 2) Adjust Sub bright to set Low light level to 10 cd/m
2
Cool exactly.
Aspect: PANEL W/B
16:9 G cut off 3) Set G cut off to " 80 ".
PANEL W/B
B cut off 4) Adjust B and R cut off to set color temperature as
R cut off shown Fig.-01.
High light 75% Sub Adjust
Low light 15% Sub Bright 5) If Sub Bright is changed re-adjust it to set Low light
to 10 cd/m
2 .
6)Find 75% of white area by color sensor.
PANEL W/BG Drive 7) Set G Drive to " D8 ".
PANEL W/BB Drive 8) Adjust B and R Drive to set color temperature
R Drive as shown Fig.-01.
9) Repeat item 4) to 7) to set both Low light and
high light.
PANEL W/B
R,G,B Drive 10) Increase same steps of R, G and B Drive to set
R,G,B Drive largest level of 3 color drive to "FC".
PANEL W/B
R,G,B cut off 11) Re-adjust Low light level again.
Color Temp. x y
Cool(Hi) 0.272 0.290
Normal(Mid) 0.288 0.296
Warm(Low) 0.313 0.329
Fig. -01
2 Picture: 1) Change white balance to "Normal".
Normal PANEL W/B
White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode.
Normal PANEL W/B
Aspect: R,G,B Drive
16:9
3 Picture: 1) Change white balance to "Normal".
Normal PANEL W/B
White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode.
Warm PANEL W/B
Aspect: R,G,B Drive
16:9
4 Picture: Picture Menu 1) Change color templature to "Cool".
Normal Sub Adjust
White balance: Sub Bright 2)Re-set Sub bright to "30"
Cool
Aspect: 16:9
INPUT Alignment menu ProcedureEquipment Setting
17

5.4. PAL/SECAM panel white balance
1 PAL Color Picture: 1) Find the nearest area to brightness of 10 cd/m2 as Low
Gray Scale Analyzer Normal Sub Adjust light by color sensor.
Pattern White balance: Sub Bright 2) Adjust Sub bright to set Low light level to 10 cd/m2
Cool exactly.
Aspect: PANEL W/B
16:9 G cut off 3) Set G cut off to " 80 ".
PANEL W/B
B cut off 4) Adjust B and R cut off to set color temperature as
R cut off shown Fig.-02.
High light 75% Sub Adjust
Low light 15% Sub Bright 5) If Sub Bright is changed re-adjust it to set Low light
to 10 cd/m2.
6)Find 75% of white area by color sensor.
PANEL W/BG Drive 7) Set G Drive to " D8 ".
PANEL W/BB Drive 8) Adjust B and R Drive to set color temperature
R Drive as shown Fig.-02.
9) Repeat procedure 4) to 7) to set both Low light and
high light.
PANEL W/B
R,G,B Drive 10) Increase same steps of R, G and B Drive to set
R,G,B Drive largest level of 3 color drive to "FC".
PANEL W/B
R,G,B cut off 11) Re-adjust Low light level again.
Color Temp. x y
Cool(Hi) 0.272 0.290
Normal(Mid) 0.288 0.296
Warm(Low) 0.313 0.329
Fig. -02
2 Picture: 1) Change white balance to "Normal".
Normal PANEL W/B
White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode.
Normal PANEL W/B
Aspect: R,G,B Drive
16:9
3 Picture: 1) Change white balance to "Normal".
Normal PANEL W/B
White balance: R,G,B cut off 2) Repeat procedure 3) to 11) of Cool mode.
Warm PANEL W/B
Aspect: R,G,B Drive
16:9
4 Picture: Picture Menu 1) Change color templature to "Cool".
Normal Sub Adjust
White balance: Sub Bright 2)Re-set Sub bright to "30"
Cool
Aspect: 16:9
INPUT Alignment menu ProcedureEquipment Setting
18

5 Picture: 1) Write down each color temaparature of R,G,B drive and
Normal Cut off data as follows.
Aspect: 16:9
White balance: White Balance Cool Normal Warm
Cool R Drive
Normal G Drive
Warm B Drive
R Cut off
G Cut off
B Cut off
SECAM signal 2) Input SECAM signal.
3) Copy PAL R,G,B drive and cut off data of each white
balance mode to SECAM position.
Alignment menu ProcedureEquipment Setting
19

5.5. Pedestal setting
** Adjust at the dark room.
1 Component Picture: PANEL W/B
(525i, 525p, 625i, Normal R cut off 1) Set R,G and B cut off to " 80 ".
720i or 1080i) White balance: G cut off
Cool B cut off
Gray Scale Aspect: Chroma Control:
Pattern 16:9 Gun off 2) Set Gun off to "5". (Only green pixels can emit.)
RGB Sub Adjust:
G Sub Bright 3) Adjust G Sub bright to start some of green pixels emission
at black 2% area and no emission at black 0% area.
Chroma Control:
Gun off 4) Set Gun off to "3". (Only blue pixels can emit.)
RGB Sub Adjust:
Black 2 % B Sub Bright 5) Adjust B Sub bright to start some of blue pixels emission
Black 0 % at black 2% area and no emission at black 0% area.
Chroma Control:
Gun off 6) Set Gun off to "6". (Only red pixels can emit.)
RGB Sub Adjust:
R Sub Bright 7) Adjust R Sub bright to start some of red pixels emission
at black 2% area and no emission at black 0% area.
2 RGB(PC) Picture: 1) Change input to RGB signal.
Gray Scale Normal PANEL W/B
Pattern White balance: R,G,B cut off 2) Repeat procedure 1) to 7) of Component input signal.
Cool PANEL W/B
Aspect: R,G,B Drive
16:9
Black 2 %
Black 0 %
INPUT Alignment menu ProcedureEquipment Setting
20