Toshiba 28N14D, 28N14G Schematic

FILE NO. 050-200131

TOSHIBA

SERVICE MANUAL

COLOUR TELEVISION

28N14D, 28N14G.

PRINTED IN GERMANY 2001 C

3.4 IR-Dataprogrammer (bei SAT nicht möglich)

Mit Taste "Ǻ" die Dialogzeile "IDP2 HP" über "Dialog Center" –>
"Service" aufrufen.
Mit der Taste "OK" können mit dem IR-Dataprogrammer 2 max. 99
Programmplätze mit Daten für Kanal, Norm, Peri, 6-stellige Sender­einblendung, Finetuning-Mitte und Lautstärke-Offset "0" ab­gespeichert werden.
Der Programmer überträgt nur Kanäle und die 6-stelligen Sender­kennzeichen mit Finetuning Mitte und Lautstärke-Offset "0".

4. Service-Einstellungen für den Fachhandel

4.1 Service-Menü

Mit Taste "Ǻ" das Service Menü über "Dialog Center" –> "Service" –>
Service Code aufrufen.
Nach Eingabe der Codezahl "8500" kann der Fachhändler den Geräte­abgleich laut Menüführung durchführen für:

- Geometry

- White adjustment

- AGC

- AFC

- OSD horizontal

- OSD vertical

- Hotel

- OEM

- Remote control

Abgleich: Seite 2-1

4.2 OSD-Lage

Mit Taste "Ǻ" die Dialogzeile "OSD" über "Dialog Center" –> "Service"
–> Service Code "8500" aufrufen.
Mit den Tasten ǸǷ können Sie die horizontale, oder vertikale Lage
des Einblend-Menüs verschieben und "with mem" sichern.

4.3 Hotel-Mode

4.3.1 Hotel-Mode aktivieren

Mit Taste "Ǻ" die Dialogzeile "Hotel" über "Dialog Center" –> "Service"
–> Service Code "8500" aufrufen.
Bei aktiviertem "Hotel-Mode" ist:

- der Aufruf des "Dialog Center" mit der Taste "Ǻ" nicht mehr möglich.

- die zuletzt eingestellte Lautstärke die maximale Lautstärke die
gespeichert wird.

4.3.2 Hotel-Mode ausschalten

Taste "Ǻ" der Fernbedienung gedrückt halten und das Gerät mit dem
Netzschalter einschalten. Im Menü "Service" Hotel-Mode wieder
ausschalten.

4.4 OEM

Mit Taste "Ǻ" die Dialogzeile "OEM" über "Dialog Center" –> "Service"
–> Service Code "8500" aufrufen.
Farbumstellung der Menüs.
Für Toshiba Menü Standardeinstellung: OEM "a".

4.5 Remote Control

Mit Taste "Ǻ" die Dialogzeile "Remote cont." über "Dialog Center" –>
"Service" –> Service Code "8500" aufrufen.
RC 150 (36kHz) = "1"

4.6 Leuchtstärke LED Betriebsanzeige

Mit Taste "Ǻ" die Dialogzeile "End" über "Dialog Center" –> "Service"
–> Service Code "8500" aufrufen.
Mit den Fernbedientasten "rot" minus und "grün" plus wird die
Leuchtstärke der LED im Betriebszustand eingestellt.
Mit den Fernbedientasten "gelb" minus und "blau" plus wird die
Leuchtstärke der LED in Standby eingestellt.

4.7 Schutzschaltungen deaktivieren

- Horizontal- und Vertikal-Schutzschaltung:
Basis und Emitter des CT50055 verbinden.

- Horizontal- Schutzschaltung:
Basis und Kollektor des CT57113 verbinden.

- Vertikal- Schutzschaltung: C50052 kurzschließen.

Service and Special Functions

1. Switching-on Options

1.1 ATS Reset (Automatic Tuning System)

Press the power "ON" button while pressing button "
Control –> LANGUAGE SELECTION –> OK.
The ATS system stops at every station of acceptable reception quality
(AFC and coincidence) and stores the station data and the respective
standard automatically (data is stored immediately in the
CIC82501 NVM). The system then continues searching.
Pressing the "TXT" button stops the ATS function.

1.2 Loading the Average Values / Emergency Data Set (ROM Data)

Press and hold the "P-" button on the Remote Control and switch on
with the mains button. After replacement of CIC82501 (NVM) for
example, the TV set is started with the emergency data set.
In doing so, the basic data is read out from the ROM of processor
IC81500 and loaded into the NVM CIC82501:

CIC82501: (data specific to the TV can be set via the Dialog Center):

- chroma and audio standards

- decoder settings

- reversing point

- OSD position

- ATS reset

- Hotel Mode on/off

- AGC and AFC

- analog values (volume, brightness etc.)

- picture sharpness

- security on/off

- geometry adjustment

- programme data (channel finetuning, station ident)

Subsequently enter your personal values, picture geometry via the
Dialog Center.

1.3 Cancelling the Parental Lock Continuously
To cancel the parental lock enter the number 7038.

1.4 EPROM Version Number

With the Remote Control "1" setting in the menu for the specialized
dealer (RC150):
Press button "
version number of the EPROM.

1.5 Switching on with the Last Viewed Programme.

The channel position which has been selected when switching off is
recovered when switching on again (last station memory).

2. Special Functions in the Dialog Center

2.1 Activating or Deactivating the Economy Mains Switch (option)

Reach the "Economy mains switch" menu with button "Ǻ" via "Dialog
Center" –> "Special functions". With the buttons ǷǸ select "1h…3h".
The TV receiver switches off completely from Standby mode at the
predetermined time or by pressing the mains button Ǽ twice.
This function is not used when "off" is selected.

2.2 Sound Scale or Picture/Sound Settings

With the Remote Control "1" setting in the menu for the specialized
dealer (RC150):
Reach the "Sound scale" menu with button "Ǻ" via "Dialog Center" –>
"Special functions".
With the "off" setting, the sound scale is not displayed on the screen.

2.3 Automatic Volume Control (option)

Reach the "Volume Limiter" dialog via "Dialog Center" –>
"Special functions" by pressing button "Ǻ". The volume of stations with
large deviation is adjusted to normal deviation when selecting "on".
With the "Dolby Surround" setting in the Sound menu, this function is
deactivated.

Ǻ" to call up the "Dialog Center". Button "z" shows the

Ƿ" on the Remote

Achtung: Nach beendeter Reparatur Schutzschaltungen unbedingt

aktivieren.

1 - 15

2.4 Decoder Settings for Individual Programme Positions

By pressing button "Ǻ" call up the "Decoder Pxx" dialog via "Dialog
Center" –> "Special functions". With the ǸǷ buttons it is possible to
set an analog or digital decoder to be switched over internally or
externally on a per-programme basis for scrambled stations.
Possible decoder settings are: "off", "ON1", "ON2", "ON3".

Meaning of the decoder settings:

Sound Picture

Decoder "off" internal internal
Decoder "ON1" external Analog external

Sound autom. internal Nicam
Decoder "ON2" external Analog external

all sounds external Nicam
Decoder "ON3" internal Analog external

all sounds internal Nicam

The different possibilities of setting the decoder function ensure that
the audio signal path is always switched correctly.

The three possible scrambling methods are:

Operating Mode:

Picture Sound Menu Display

1. Scrambled Analog scrambled Analog ext. or ON1
Nicam not scrambled Nicam internal

2. Scrambled Analog scrambled Analog ext. or ON2
Nicam scrambled Nicam internal

3. Scrambled Analog not scrambled Analog int. or ON3
Nicam not scrambled Nicam internal

Method 1 is for Channel+ operation.
Methods 2 and 3 are used for example in Great Britain.

Video Signal Path

Due to the fact that the video signal is generally scrambled it is only
necessary to apply the decoder video signal switching voltage.

Audio Signal Path

Case 1:
The decoder is not stereo capable. Therefore the Nicam sound is not
scrambled. The decoder changes the audio path in dependence of the
Nicam decoder between internal and external.
Case 2:
The decoder is stereo capable for scrambled analog and Nicam sound.
Therefore the decoder is switched over to external operation (usual
case).
Case 3:
The sound is generally connected only internally (no connection to the
audio path of the EURO-AV socket).

2.5 Video AV (only in AV mode)

The AV 1 socket is switched in VHS/SVHS mode.

3. Open Service Settings

3.1 Maximum Programme Number (reversing point)

Call up the programme number which is one higher than the highest
selectable programme position. With button "Ǻ" select the dialog line
"Manual tuning" via the "Dialog Center". Following the menu guide,
enter "00" in the "Channel" dialog line. Confirm with "OK" and exit the
menu. After this setting only those programme positions can be
selected with the "P+/P-" buttons in Programme Mode which are lower
than the "00" position.

3.2 Factory Settings

Press the "Ǻ" button to select the "Factory settings" dialog line via
"Dialog Center" –> "Service".
Use the "OK" button on the remote control to call up the factory settings
(NVM) and to store them.

3.3 Forced Chroma Switching

Call up the dialog line "Color" via "Dialog Center" –> "Service" with
button "Ǻ". With the buttons ǸǷ it is possible to force the automatic
chroma standard switching function into "PAL", "SECAM" or "NTSC

3.6" or "NTSC 4.4" on a per-programme basis under poor reception

conditions.

3.4 IR Data Programmer (for SAT not possible)

Call up the dialog line "IDP2 HP" via "Dialog Center" –> "Service" with
button "Ǻ".
Using the "OK" button, it is possible to store up to 99 programme
positions with data for channel, TV standard, Peri, 6-position station
name, centre fine tuning, and "0" volume offset, with the help of the IR
data programmer 2.
The Programmer transfers only the 6-position station name with centre
fine tuning and "0" volume offset.

4. Service Settings for the Dealer

4.1 Service Menu

Call up the Service Menu with button "Ǻ" via "Dialog Center" –>
"Service" –> Service Code.
Having entered the code number "8500" the dealer can change the
following settings under menu guide:

- Geometry

- White adjustment

- AGC

- AFC

- OSD horizontal

- OSD vertical

- Hotel

- OEM

- Remote control

Alignment: page 2-3

4.2 OSD Position

Call up the dialog line "OSD" with button "Ǻ" via "Dialog Center" –>
"Service" –> Service Code "8500".
With the ǸǷ buttons it is possible to shift the on screen display in the
horizontal or vertical direction and to store this position "with mem.".

4.3 Hotel Mode

4.3.1 Activating the Hotel Mode

Call up the dialog line "Hotel" with button "Ǻ" via "Dialog Center" –>
"Service" –> Service Code "8500".
With activated "Hotel Mode":

- it is no longer possible to call up the "Dialog Center" menu with

button "Ǻ".

- the last volume setting is stored as the maximum level possible.

4.3.2 Deactivating the Hotel Mode

Press and hold button "Ǻ" on the remote control handset while switching
the TV set on with the mains switch. Under the "Service" menu switch
the Hotel Mode off.

4.4 OEM

Call up the dialog line "OEM" with button "Ǻ" via "Dialog Center" –>
"Service" –> Service Code "8500".
Colour change of the menus.
Standard setting for Toshiba menu: OEM "a".

4.5 Remote Control

Call up the dialog line "Remote cont." with button "Ǻ" via "Dialog Center"
–> "Service" –> Service Code "8500".
RC 150 (36kHz) = "1"

4.6 Luminosity of the Operating Mode LED

Call up the dialog line "End" with button "Ǻ" via "Dialog Center" –>
"Service" –> Service Code "8500".
Use the "red" minus and "green" plus buttons on the remote control to
adjust the LED luminosity in normal operating mode.
Use the "yellow" minus and "blue" plus buttons on the remote control
to adjust the LED luminosity in standby mode.

4.7 Deactivating the Protection Circuit

- Horizontal and vertical protection circuit:
connect the basis and emitter at CT50055.

- Horizontal protection circuit:
connect the basis and collector at CT57113.

- Vertical protection circuit: to short out C50052.

Attention: When the repair is completed, it is absolutely necessary to

activate the overlaod protection circuits.

1 - 16

Alignment

Attention!

1. Carry out the alignment with the unit at operating temperature (about 15 min.).

2. Keep the "Sub. Contrast" setting unchanged (factory setting).

All adjustment controls not mentioned in this description are pre-set at the factory and must not be re-adjusted in the case of repairs.

Measuring instruments: 100MHz oscilloscop with 10:1 test probe, digital voltmeter, colour video generator.

Service works after replacement or repair of the following modules:

- Power supply: alignment 1.

- IF: alignment 2.

- IC34015: alignment 3.

- CRT, CRT plate: alignment 6…9.

- Deflection: alignment 9.

- NVM CIC82501: alignment 2…6 and 10.

Alignment Preparations Alignment Process

1. +A voltage

2. Tuner AGC

3. AFC

4. OSD

5. OEM

6. White Balance

This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.

Brightness: Minimum
Contrast: Minimum
Digital voltmeter: Cathode D61016

100MHz oscilloscope: Channel A: Tuner contact 11.

Colour video generator: Feed in a colour scale (with switched-

Call up the dialog line "AGC" via "Ǻ" (Dialog Center) –>
Service –> "OK" –> Service Code "8500".

Colour video generator: Feed in a colour scale with standard

Call up the dialog line "AFC" via "Ǻ" (Dialog Center) –>
Service –> "OK" –> Service Code "8500".

Call up the dialog line "OSD" (horiz. or vertic.) via "Ǻ" (Dialog
Center) –> Service –> "OK" –> Service Code "8500".

Call up the dialog line "OEM" via "Ǻ" (Dialog Center) –>
Service –> "OK" –> Service Code "8500".

Colour video generator:
Contrast: maximum
Colour contrast: mid-position
Screen brightness: mid-position

Call up dialog line "White adjustment" via "Ǻ" (Dialog Center)
–> Service –> "OK" –> Service Code "8500".

Ground: Tuner

off sound carrier) via the aerial,
≥80dBµV.

channel spacing without finetuning
in Band 1 (channel 2…4).

Feed in a grey scale with burst.

Adjust +A acc. to the table (page 3-15) on the deflection
diagram with R60516 resp. R61508.

Adjust 300mVpp using button Ǹ or Ƿ.

Exit the dialog line "End" with "with mem" –> "OK".

Press the "OK" button. The alignment is carried out
automatically.

Exit the dialog line "End" with "with mem" –> "OK".

With button Ǹ or Ƿ position the menu in the middle of the
picture.
Exit the dialog line "End" with "with mem" –> "OK".

With button Ǹ or Ƿ select "a".
Exit the dialog line "End" with "with mem" –> "OK".

With button Ǹ or Ƿ set the values for "Green" and "Blue"
so that the picture becomes achromatic.

Check this alignment at minimum and maximum contrast.
Go back to the "SERVICE" menu with "Ǻ" then exit the
dialog line "End" with "with mem" –> "OK".

7. Screen grid
voltage U

Colour video generator:

G2

High-resistance volt­meter via 220kΩ: Test points R, G, B

Determine the test point having the highest voltage.

Feed in a black test pattern.
Adjust the screen brightness so that
the test pattern just turns dark.

(picture tube plate).

Use the UG2 control (splitter transformer) to adjust at the
test point having the highest voltage potential a voltage of

162.5V ± 2.5V.

2 - 3

Oszillogramme Chassis / Oscillograms Chassis

1 2 3 4

5

6 7 8

9 0 ! @

# $ % ^

& *

18A

(

3 - 7

Oszillogramme Chassis / Oscillograms Chassis

) ¡

≤ ∞

•

ª º ⁄

™ £

CLK

DATA

˲v

≥

3 - 8

Teilschaltplan Netzteil / Circuit Diagram Mains Section

1

PFC2

**

BR62500

2,2n/400V_AC

PFC

29201-700.9700

PFC1
1

C62521

K

M

F

BR62501

!

SI62501

T2,5AL

C62503

ST_E

1

2

ENTMAGNETISIERUNG

NETZ1

1

1

3

ST-NETZ1

Seite / Page 3 - 27

1

NETZ2

P

D60523

B380/C1500

n.v.

D60024

*

K

1N4007

C60523

P

D60022

1n

1N4007

K

C60524

R62501

8311-200-*

n.v. n.v.

F

C62501

C62522

K

2,2n/400V_AC

0,1u/MKS4-R/250V_AC

NUR BEI EXT. NETZSCHALTERPL.
ONLY WITH
SEUL. POUR
SOLO CON
SOLO CON

BR62502

BR62503

220u/385V

n.v.

D60027

C60526

1N4007

31

D60026

1N4007

C60527

R62502

**

BR62505

21

L62501

29500-839.97

0,1u/MP3/250V_AC

BR62504

*

C60528

K

1n

K

NTC4,7

43

+

*

BR62506

R62503

n.v.

3M/2%

R60502

18k

CC60546

CR60546

1,5n

CC60516

P

n.v.

BR60014

F

*

C62502

0,1u/MP3/250V_AC

OPTION N1

11

1n

PP

1

56k

CR60516

P

PRIMAERMASSE / NICHT NETZGETRENNTES SCHALTUNGSTEIL
PRIMARY CHASSIS, NOTE / CIRCUT NOT MAINS ISOLATED
MASSE PRIMAIRE / CIRCUIT NON ISOLE DU SECTEUR

P

MASSA PRIMARIO / CIRCUITO NON SEPAR., DALA RETE
MASA PRIMARIA / SECTOUR DE COM. NO SEP. DE LA RED

*

R60504

C60504

P

6789

PVC/

STAND-BY

ON-TIME

COMPERATOR

LOGIK

OFF-TIME

COMPERATOR

IC60510

TDA16846

n.v.

1n

P

CC60532

5

42

1,8k

R60531

P

10

F

220p

C60513

P

OK60531

CN17F1

1

SYNC

P

56k

CC60514

CR60513

P

+M

D61503

ZD12V/2%

OPTION N2

45

P

CR61502

1

UB

ERROR

1,5n

1k

F

2

*

13

R60506

14

CC60517

3

12

*

P

BR60516

R61507

+A

22k

M

1

IC61510

LM358N

CR61501

18k

22

0,1u

P

R60516

CR60515

P

22k

4

+

8

C61501

+M

CC61512

P

R60505

P

+

C60511

P

4,7k

16k

R61508

+H

-

F

2,2n

47n

T60506

G

2,2k

270p/2kV

47u/40V

4

CR61503

3

2

K

C60501

*

C60512

K

D60512

BYT53B

CC60515

n.v.

R61506

220

10k

BZT03D180

1n

P

P

33n/MKT15

D

S

P

R60513

39p

P

K

C62548

CR61504

CR61511

D60509

C60507

F

R60512

15

27k

1n/400V_AC

1k

M

2,2k

2

R60509

2

R60508

D60506

F

C60509

P

PP

R62549

MM

33k

CR61505

3,3n

CC61511

MM

TR61000

29201-343.97

22k

22k

L60506

32

BYT54M

-57

680p/FKP1/1,6KV

4,7M

n.v.

BR61016

F

C61016

220p/FKP1/1,6kV

M

L61016

D61016

SF5408

+

C61017

M

*

100u/

1

82k

R61018

M

Tabelle Seite 3 - 15
Table page 3 - 15

IC 60510

Pin 1 3V
Pin 2 1,8V
Pin 3 2V
Pin 4 4V
Pin 5 4,8V

*

1

BR61015

23

BR61014

4

5

n.v.

BY

OFF

POWER

U

ECO

U

STAND

U

+A

/*

Pin 6 0V
Pin 7 6,5V
Pin 8 0V
Pin 9 6,6V
Pin 10 0V

5

Pin 11 1,7V
Pin 12 0V
Pin 13 2,9V
Pin 14 12,5V

+

C61037

M

+

C61057

L61038

-003

470u/40V

470u/25V

32

IC61040

IN OUT

LM317

ADJUST

1

CC61038

M

32

0,1u

CC61060

CC61058

M M

MP

R61043

1,2k/1%

IC61050

IN OUT

LM317T

ADJUST

0,1u

R61053

CR61041

220/1%

CT61043

BC848B

1

680/1%

CR61051

0,1u

0,1u

CC61039

MM M M

CC61041

22k

CR61044

MMM

220/1%

CT61053

BC848B

0,1u

MMM

R61046

22k

CC61051

MM

CR61054

C61042

0,1u

C61052

R61056

22k

+

+

22k

BR61041

L61041

n.v.

470u/25V

470u/25V

CC61059

2,2n

+M

+F

/+14V

+E

/+8V

/+5V

BR61037

L61036

6

n.v.

BR61055

L61056

8

7

10

SI61056

T2A

-14

M

C61036

100p

D61037

MUR840

D61036

MUR420

C61056

100p

D61056

MUR420

n.v.

S62501

S2KO007

ENTF. BEI EXT. NETZSCHALTERPL.
DELETED WITH
N’EXISTE PAS POUR
MANCA CON
NO EXISTE EN

AENDERUNGEN VORBEHALTEN

SUBJECT TO ALTERNATION

SOURS RESERVE DE MODIFIC
CON RISERVA DI MODIFICA

RESERV. EL DEREC. DE MODIFIC.

BR81505

1N4148

D81501

BR81501 BR81502

NUR BEI OEKO-SCHALTER AUF CHASSIS
ONLY WITH ECO SWITCH
SEUL.POUR INTERR.ECOLOG.
SOLO CON INTERR.ECOLOGICO
SOLO CON EL INTERR.ECOL.

T81501

2SD1866

n.v.

CR81500

+M/1

CR81501

4,7k

10k

22k

CR81503

CT81502

BC848B

CR81504

10k

NUR BEI OEKO-SCHALTER
ONLY WITH ECO SWITCH
SEUL.POUR INTERR.ECOLOG.
SOLO CON INTERR.ECOLOGICO

22k

SOLO CON EL INTERR.ECOL.

CR81502

BR81509

10k

CR81505

+M+M/1

M

BR81508

+M/1

3 - 13

55cm/RF

63cm PHI

70cm PHI

72cm SF

63cm TESLA

70cm TESLA

*

CUC2130

CUC2130

CUC2130

CUC2131

CUC213X

CUC2130

CUC2130

OPTION OPTION

N2N1

1,2M/2%

1,2M/2%

1,2M/2%

1,5M/2%

1,2M/2%

1,2M/2%

C60504R60504

390p/2,5%

390p/2,5%

390p/2,5%

330p/2,5%1,5M/2%

330p/2,5%

390p/2,5%

390p/2,5%

T60506

BC40

BC40

BC40

PC50

PC50

BC40

BC40

1

0,1u

CC61061

M MMM

R60516BR60516

4,7k

4,7k

4,7k

4,7k

4,7k

4,7k

4,7k

0,1u

CC61064

M

C60523

TR61000 BR62500 BR62504/05

C60526

-346.97

1n

1n

-345.97

-345.97

1n

-346.97

-347.9772cm RF

-345.97

-345.97

IC61060

MC7805

2

3

SI62501

T2,5AL

T2,5AL

T2,5AL

T2,5AL

T2,5AL

0,1u

CC61062

BR62501

+

C61063

100u/25V

+H

Spannungstabelle

Table of Voltages

+C +200V
+D +26V
+E +8V
+F +5V
+H +5V
+M +14V
+S +13V

/+5V

22241-907.01

180901

3 - 14