Toshiba TW40F80 Installation guide

TECHNICAL TRAINING MANUAL
N5SS CHASSIS
NTDPJTV05
TW40F80
PROJECTION TELEVISION
Only the different points from the training manual “N5SS chassis” with its file
No. 026-9506 are described on this manual.
For other parts common with “N5SS chassis”, please refer to the original manual
with its file No. 026-9506.
©1997 TOSHIBA AMERICA CONSUMER PRODUCTS, INC.
NATIONAL SERVICE DIVISION
TRAINING DEPARTMENT
1420-B TOSHIBA DRIVE
LEBANON, TENNESSEE 37087
PHONE: [phone]
FAX: [phone]
www.toshiba.com/tacp

Contents
SECTION I: OUTLINE................................................................................................6
1. FEATURE....................................................................................................................6
2. MERITS OF BUS SYSTEM......................................................................................6
3. SPECIFICATIONS..................................................................................................... 7
4. FRONT VIEW ...........................................................................................................8
5. REAR VIEW ............................................................................................................... 9
6. REMOTE CONTROL VIEW..................................................................................10
7. CHASSIS LAYOUT..................................................................................................11
8. CONSTRUCTION OF CHASSIS...........................................................................12
SECTION II: TUNER, IF/MTS/S. PRO MODULE ................................................13
1. CIRCUIT BLOCK ................................................................................................... 13
2. POP TUNER ............................................................................................................. 17
SECTION III: CHANNEL SELECTION CIRCUIT ............................................... 18
1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM ..........................18
2. OPERATION OF CHANNEL SELECTION CIRCUIT ......................................18
3. MICROCOMPUTER............................................................................................... 19
4. MICROCOMPUTER TERMINAL FUNCTION..................................................20
5. EEPROM (QA02) .....................................................................................................22
6. ON SCREEN FUNCTION....................................................................................... 22
7. SYSTEM BLOCK DIAGRAM................................................................................ 23
8. LOCAL KEY DETECTION METHOD ................................................................ 24
9. REMOTE CONTROL CODE ASSIGNMENT ..................................................... 25
10. ENTERING TO SERVICE MODE ...................................................................... 28
11. TEST SIGNAL SELECTION ...............................................................................28
12. SERVICE ADJUSTMENT .................................................................................... 28
13. FAILURE DIAGNOSIS PROCEDURE ............................................................... 29
14. TROUBLESHOOTING CHART .......................................................................... 32
SECTION IV: DVD SWITCH CIRCUIT ................................................................. 35
1. DVD SWITCH BLOCK DIAGRAM ...................................................................... 35
2. OUTLINE..................................................................................................................36
Contents Page 1

SECTION V: WAC CIRCUIT .................................................................................... 37
1. OUTLINE..................................................................................................................37
2. CIRCUIT OPERATION ..........................................................................................37
3. BLOCK DIAGRAM ................................................................................................. 42
4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS
PROCEDURES......................................................................................................... 43
SECTION VI: DUAL CIRCUIT ................................................................................ 45
1. OUTLINE..................................................................................................................45
2. PRINCIPLES OF OPERATION............................................................................. 45
3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT......................................46
4. CIRCUIT OPERATION ..........................................................................................47
5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OF
MAIN IC.................................................................................................................... 51
SECTION VII: 3-DIMENSION Y/C SEPARATOR CIRCUIT .............................. 58
1. OUTLINE..................................................................................................................58
2. CIRCUIT DESCRIPTION ...................................................................................... 58
SECTION VIII: VERTICAL OUTPUT CIRCUIT.................................................. 60
1. OUTLINE..................................................................................................................60
2. V OUTPUT CIRCUIT.............................................................................................. 61
3. PROTECTION CIRCUIT FOR V DEFLECTION STOP ...................................64
4. RASTER POSITION SWITCHING CIRCUIT .................................................... 66
SECTION IX: HORIZONTAL DEFLECTION CIRCUIT .................................... 67
1. OUTLINE..................................................................................................................67
2. HORIZONTAL DRIVE CIRCUIT.........................................................................67
3. BASIC OPERATION OF HORIZONTAL DRIVE............................................... 67
4. HORIZONTAL OUTPUT CIRCUIT ..................................................................... 69
5. HIGH VOLTAGE GENERATION CIRCUIT .......................................................76
6. HIGH VOLTAGE CIRCUIT ................................................................................... 78
7. X-RAY PROTECTION CIRCUIT.......................................................................... 80
8. OVER CURRENT PROTECTION CIRCUIT ...................................................... 81
Contents Page 2

SECTION X: DEFLECTION DISTORTION CORRECTION CIRCUIT
(SIDE DPC CIRCUIT)............................................................................................... 82
1. DEFLECTION DISTORTION CORRECTION IC (TA8859CP) ....................... 82
2. DIODE MODULATOR CIRCUIT ......................................................................... 83
3. ACTUAL CIRCUIT..................................................................................................84
SECTION XI: DIGITAL CONVERGENCE CIRCUIT ......................................... 87
1. OUTLINE..................................................................................................................87
2. CIRCUIT DESCRIPTION ...................................................................................... 87
3. PICTURE ADJUSTMENT......................................................................................89
4. CASE STUDY ........................................................................................................... 97
5. TROUBLESHOOTING ...........................................................................................98
6. CONVERGENCE OUTPUT CIRCUIT................................................................. 99
7. CONVERGENCE TROUBLESHOOTING CHART ......................................... 101
Contents Page 3
OVERALL BLOCK DIAGRAM................................................................................102

5
2. MERITS OF BUS SYSTEM
2-1. Improved Serviceability
Most of the adjustments previously made by resetting vari-
able resistors and/or capacitors can be made on the new chas-
sis by operating the remote control and seeing the results on
the TV screen. This allows seeing adjustments to be made
without removing servicing speed and efficiency.
2-2. Reduction of Parts Count
The use of digital-to-analog converters built into the ICs,
allowing them to be controlled by software, has eliminated
or reduced the requirement for many discrete parts such as
potentiometers and trimmers, etc.
2-3. Quality Control
This central control of the adjustment data makes it easier to
understand, analyze, and review the data, thus improving
quality of the product.
***
1. FEATURE
The TW40F80 is a first PJ-TV with a wide screen aspect
ratio of 16:9 we introduce to North U.S.A. markets.
As the basic chassis N5SS chassis is used.
The future of the model TW40F80 is the use of the N5SS
chassis. This chassis introduces a new bus system, devel-
oped by the PHILIPS company, called the I2C (or IIC) bus.
IIC stands for Inter-Integrated Circuit control. This bus co-
ordinates the transfer of data and control between ICs inside
the TV. It is a bi-directional serial bus consisting of two lines,
named SDA (Serial DATA), and SCL (Serial CLOCK). This
bus control system is made possible through the use of digi-
tal-to analog converters built into the ICs, allowing them to
be addressed and controlled by strings of digital instructions.
The TW40F80 is a first wide TV with a double window sys-
tem we introduce to North U.S.A. markets.
The size of the main and sub screens separated in left and
right on the screen is the same as each other. So it is possible
to enjoy two programs or video and TV program at the same
time.
The sub screen is equipped wit 9 screen search function and
this is very convenient convenient to search a program you
desire.
Note:
Only the different points from the manual
“N5SS Chassis” with its file No. 026-9506
aredescribedonthismanual. Forother parts
common with “N5SS Chassis”, please refer
to the original manual with its File No. 026-
9506.
SECTION I: OUTLINE

6
C-Chassis
Model TW56F80TW40F80 TP61F90 TP61F80 TP55F80 TP55F81 TP50F90 TP50F60 TP50F61 TP50F50 TP50F51
CRT 7" 7" 7" 7" 7" 7" 7" 7" 7" 7" 7"
CRT Source Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach
Remote H/U Intell Univ Intell Univ Univ Univ Intell Univ Univ. A-Univ A-Univ
RMT Keys 52 key 36 key 52 key 36 key 36 key 36 key 52 key 36 key 36 key 42 key 42 key
PIP 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 1-TN 1-TN
Dolby Surr ProLgc ProLgc Dy-Sur Dy-Sur Dy-Sur ProLgc
Surround Dsp4Ch ●Dsp4Ch Dsp4Ch Dsp4Ch Dsp4Ch Dsp4Ch ●●●●
SAP ●●●●●●●●●●●
Cyclone
SBS ●●●●●●●●●●●
Audio (W) 28W 28W 28W 28W 28W 28W 28W 28W 28W 28W 28W
Center +20W 20W 20W
Rear +20W 20W 20W 20W 20W 20W
Comb-Filter 3D-Y/C 3D-Y/C 3D-Y/C 3D-Y/C DIG DIG DIG DIG DIG DIG DIG
DQF ●●●●
Scan-Modul ●●●●●●●●●●●
VCC ●●
Black-Expan ●●●●●●●●●●●
Color-D.E ●●●●●●●●●●●
Pic-Prefer ●●●●●●●●●●●
Color-Temp ●●●●●●●●●●●
Flesh-Tone ●●●●●●●●●●●
Nois-Reduce ●●●●●●●●●●●
Hori-Resolu 800 800 800 800 800 800 800 800 800 800 800
Fav-Channel ●●●●●●●●●●●
Ch-Label ●●●●●●●●●●●
3-Language ●●●●●●●●●●●
Clock ●●●●●●●●●●●
Ch-Lock/Off ●●●●●●●●●●●
C.Caption ●●●●●●●●●●●
EDS ● ●●● ●●●●
New-OSD ●●●●●●●●●
S/Sight ●● ●
S-Video In 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1 1
AV-In/Out 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 2/1 2/1
Front-Term ●●●●●●●●●
A(Var)-Out ●●●●●●●●●●●
2RF-Term ●●●●●●●●●
SPK-Term ●●●●●●●●●●●
PIP Audio ●●
C-Ch-Input ●●●
E/Jack
S/S-Jack ●● ●
IR-B & 75W●● ●
Adapter ●●●●●●●●●●●
Rod-Antenna
SPK-Box ●●● ●
EZ RMT ●● ●
Cabinet TW56D90 40W30E TP61E90 TP61E80 TP55E80 TP55E81 New New New New New
3. SPECIFICATIONS
GENERALSOUNDPICTURE
OTHERS
TERMINALACCE
*

7
4. FRONT VIEW
Fig. 1-1
Note: [No] Owner's manual page.
POWER
DEMO
MENU
ANT/
VIDEO
ENTER
VOLUME CHANNEL
POWER indicator
POWER button
Press to open
the door.
Behind the door
ANT / VIDEO button **
ENTER button
S-VIDEO VIDEO
L/MCNO R
AUDIO
IN-VIDEO 3
VIDEO 3 INPUTS DEMO button
MENU button CHANNEL / buttons
/ buttons
VOLUME / buttons
/ buttons

8
5. REAR VIEW
S-VIDEO VIDEO
L/MCNO R
AUDIO
IN-VIDEO 3
VIDEO / AUDIO INPUT jacks (VIDEO 3)
S-VIDEO INPUT jack (VIDEO 3)
Behind the door
TV front
Fig. 1-2
EXT SPEAKER
EXT INT
ANT (75 ½)
TV
AMP
L
VIDEO/AUDIO
R
VIDEO1
VIDEO
AUDIO
L
Y
S-VIDEO
C4
AUDIO
R
VIDEO
AMP
R
VIDEO
VIDEO2 DVD
L
RVAR
ACC
AMP
NCUT
MAIN SPEAKER
(+)
(Ð)
(+)
(Ð)
EXTERNAL
SPEAKER
terminal MAIN
SPEAKER
switch
VIDEO / AUDIO
INPUT jacks
(VIDEO 1)
VIDEO / AUDIO
INPUT jacks
(VIDEO 2) DVD INPUT
jacks
VIDEO /
AUDIO
OUTPU
T
jacks
S-VIDEO INPUT jack
(VIDEO 1)
VARIABLE AUDIO
OUTPUT jacks
TV rear
Fig. 1-3

9
6. REMOTE CONTROL VIEW
ADV/
POP CH
ADV/
POP CH
23
56
89
4
7
¥
0
ENT
PIC -SIZE
TV/VIDEO
RECALL
POWER
CH
VOL
CH RTN
EDS MENU
FAV FAV
EXITRESET
STOP SCURCE PLAY POP
REC TV/VCR REW FF
CH SEARCH STILL SWAP
MUTE
1
ENTER
TOSHIBA
RECALL* [ 26 ]
POWER [ 20 ]
MUTE* [ 26 ]
CHANNEL / [ 25 ]
CH RTN* [ 26 ]
VOLUME / [ 25 ]
MENU [ 18 ]
POP CH * [ 40 ]
///[18]
RESET * [ 33 ]
POP functions* [40]
(For " TV " and " CABLE " positions)
POP CH * [ 40 ]
FAN * [ 46 ]
ENTER [ 19 ]
EDS* [ 27 ]
Channel Number* [ 25 ]
TV / VIDEO* [ 55 ]
TV / CABLE / VCR switch [ 15 ]
Set to " TV " to control the TV.
TIMER* [ 38, 39 ]
EXIT * [ ON ]
Owner's Manual page
* These function do not have
duplicate locations on the TV.
They can be controlled only by
the Remote Control.
FAN * [ 46 ]
Aim at the remote sensor on the TV
100
TV
CABLE
VCR
Fig. 1-4
Note: [No] Owner's Manual page.

10
7. CHASSIS LAYOUT
-3 :
CRT-D(B)
5
-2 :
CRT-D(G)
5
-1 :
CRT-D(R)
5
- 6 : SVM
5FOCUS PACK
- 4 : FRONT-LED
5
- 5 : FRONT-CON
5
: POWER 1
6
F.B.T
J-BOX
To CRT
To FOCUS
PACK
330
294
: MAIN
1
1pc
330
294
: DEFELECTION
2
1pc
330
294
: CONV / POWER2
3
1pc
249
165
: AV.EXT SPK
4
1pcs
249
165
: POWER 1
6
1pc
330
249
:
CRT-1pcs
D/FRONT/SHV
5
4
-1: A.V
4
-2: SPEAKER
5
-1: CRTÐD ( R )
5
-2: CRTÐD ( G )
5
-3: CRTÐD ( B )
5
-4: FRONT LED
5
-5: FRONT CON
5
-6: SVH
7
-1: NEW OSD
7
-2: FRONT SURROUND
249
165
: NEW OSD/
FRONT SURROUND
7
2pcs
249
165
: SW DVD
8
4pcs
249
249
: POWER S.S
9
2pcs
242
160
: DIGITAL
CONVER
10
2pcs
CHIP DOUBLE FACED
TW56F80 ONLY
242
139
:DUAL
11
2pcs
CHIP DOUBLE FACED
242
155
:3D Y/C
12
2pcs
CHIP DOUBLE FACED
189
139
:MAC
13 4pcs
CHIP DOUBLE
FACED
330
139
:AUDIO LIVE
14
6pcs
CHIP SINGLE FACED
242
126
:SIARSIGHT
15
1pcs
CHIP DOUBLE FACED
242
113
:DOLBY PRO
16
2pcs
CHIP DOUBLE FACED
MODE1
TW40F80
TW56F80
TUNER DOLBY DSP F.SUR COHB FDS N.OSD STARSIGHT
2
2PRO 4CH
3DYC
3DYC
POWER STARSIGHT
(TW56F80 ONLY)
9
: DIGITAL
CONVER
10
: CONVERTER/POWER 2
3
REAR ANP
(TW56F80 ONLY)
CENTER AMP
(TW56F80 ONLY)
: SW DVD
8
- 3 : DPC
4
- 2 : SPEAKER
4- 1 : A/V
4
DOLBY
PRO
16
-2:
FRO.
SURR
7
YCS
12 - 6
: DUAL
11
: AUTOLIVE
14
:WAC
13
: MAIN
1
: DEFLECTION
2
: STARSIGHT
15
- 1: NEW OSD
7
TW56F80 ONLY
TW56F80 ONLY
(chip)
PC BOARD
Fig. 1-5