Toshiba 14N21NS User Manual

TOSHIBA

SERVICE MANUAL

COLOUR TELEVISION

14N21NS

PRINTED IN UK. 2002 C

SERVICING NOTICES ON CHECKING

As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.

2. AVOID AN ELECTRIC SHOCK

There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.

3. USE THE DESIGNATED PARTS

The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a mark, the designated
parts must be used.

4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING

There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.

5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE

In the condition that an explosion-proof cathode­ray tube is set in this equipment, safety is
secured against implosion. However, when
removing it or serving from backward, it is
dangerous to give a shock. Take enough care to
deal with it.

6. AVOID AN X-RAY1. KEEP THE NOTICES

Safety is secured against an X-ray by consider­ing about the cathode-ray tube and the high
voltage peripheral circuit, etc.
Therefore, when repairing the high voltage pe­ripheral circuit, use the designated parts and
make sure not modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathode­ray tube.

PERFORM A SAFETY CHECK AFTER

7.
SERVICING

Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.

(INSULATION CHECK PROCEDURE)

1.

Unplug the plug from the AC outlet.

2.

Remove the antenna terminal on TV and turn
on the TV.

3.

Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].

4.

If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.

[Note 1]

If you have not the 500V insulation
resistance meter, use a Tester.

[Note 2]

External exposure metal: Antenna terminal

Earphone jack

HOW TO ORDER PARTS

Please include the following informations when you order parts. (Particularly the VERSION LETTER.)

1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be

found at the end of the SERIAL NUMBER.

2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.

IMPORTANT

Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.

A1-1

CONTENTS

SERVICING NOTICES ON CHECKING......................................................................................................

HOW TO ORDER PARTS ...........................................................................................................................

IMPORTANT................................................................................................................................................

CONTENTS .................................................................................................................................................

GENERAL SPECIFICATIONS ....................................................................................................................

DISASSEMBLY INSTRUCTIONS

1.REMOVAL OF ANODE CAP ..............................................................................................................

2.REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ...............................................................

SERVICE MODE LIST.................................................................................................................................

CONFIRMATION OF HOURS USED ..........................................................................................................

WHEN REPLACING EEPROM( MEMORY) IC ...........................................................................................

ELECTRICAL ADJUSTMENTS ..................................................................................................................

BLOCK DIAGRAM ......................................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN/CRT...............................................................................................................................................

SCHEMATIC DIAGRAMS

MICON/TUNER.......................................................................................................................................

CHROMA/SIF/VIF/21PIN........................................................................................................................

POWER ..................................................................................................................................................

DEFLECTION/CRT.................................................................................................................................

SOUND AMP ..........................................................................................................................................

WAVEFORMS .............................................................................................................................................

MECHANICAL EXPLODED VIEW ..............................................................................................................

MECHANICAL REPLACEMENT PARTS LIST ..........................................................................................

ELECTRICAL REPLACEMENT PARTS LIST ............................................................................................

A1-1
A1-1
A1-1
A2-1
A3-1~A3-5

B1-1
B2-1, B2-2
C-1
C-1
C-2
D-1~D-5
E-1, E-2

F-1~F-4
G-1, G-2

G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
H-1, H-2
I-1
J1-1
J2-1~ J2-4

A2-1

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 14 inch / 335.4mmV

G-2 Tuning Broadcasting System CCIR System B/G

G-3 Power Power Source AC 230V-240V AC 50Hz

G-4 Regulation Safety CE(EN60065:98)

G-5 Temperature Operation +5oC ~ +40oC

G-6 Operating Humidity Less then 80% RH

System CRT Type Normal

Color System PAL
Speaker 1 Speaker

Sound Output MAX

DDR SECAM No
NTSC3.58(AV)+NTSC4.43 Yes
PAL60Hz Yes

System Tuner and System 1Tuner

Receive CH Destination Ohers

Intermediate B/G
Frequency Picture(FP) 38.9 MHz

Preset CH 100
Stereo/Dual TV Sound
Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Deflection 90 degree
Magnetic Field BV/BH +0.45G/0.18G

Position Bottom
Size
Impedance 8 ohm

10%(Typical) 0.8 W

Tuning System F-Synth
Input Impedance VHF/UHF 75 ohm

CH Coverage S11 - S41, E21 - E69

Sound(FS) 33.4 MHz
FP-FS 5.5 MHz

DC

Stand by (at AC) 3 W at AC 230 V 50 Hz
Per Year -- kWh/Year

Radiation CE
X-Radiation -

Storage -20oC ~ +60oC

1.5 x3.0 Inch

E2 - E4, X - Z+2, S1 - S10, E5 - E12,

44 W at AC 230 V 50 Hz

1.0 W

No

A3-1

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

G-9 Clock and Sleep Timer Max Time - Min

Display Menu Type Character

Picture Yes

Contrast Yes
Brightness Yes
Colour Yes
Tint (NTSC Only) Yes
Sharpness Yes

Audio No

Bass No
Treble No
Balance No
BBE On/Off No
Stable Sound On/Off No

CH Tuning Yes

Matual Yes
Auto Yes

CH Allocation Yes
Language Yes
Clock Set No
On/OffTimer Set Yes
On Timer Set No
Pin Code Registration No
Panel Lock Yes
Nicam Auto Off No
AV Colour System Yes
Sound System No
Auto 4:3 Default No
AV2 Output No

Output Source No

Source No
Control Level Yes

Volume Yes

Brightness Yes

Contrast Yes

Colour Yes

Tint (NTSC Only) Yes

Sharpness Yes

Tuning Yes

Bass No

Treble No

Balance No

Back Light No
Nicam ST No
Tone 1/2 (A/B) No
Surround On/Off No
Pin Code No
AV Yes
Skip No
Channel Yes
Hotel Lock No
Sleep Timer No
Wide Mode No
Sound Mute Yes

Germany Italian
Polski Turkey Sweden
Netherland Portgal
Norway Finland Denmark
Czech Slovak Hungarian
Russian Greek

Timer Step - Min

Clock No
On Timer Program( On Tim) Yes
Off Timer Program( 0ff Tim) Yes
Wake Up Timer No
Timer Back-up (at Power Off Mode) more than -- Min Sec

A3-2

GENERAL SPECIFICATIONS

G-10 Remote Unit RK-EY (CT-835)

G-11 Features Auto Degauss Yes

Control Glow in Dark Remocon No

Format NEC
Custom Code 40-BF h
Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 32 Keys
Keys Power Yes

1 Yes

2 Yes

3 Yes

4 Yes

5 Yes

6 Yes

7 Yes

8 Yes

9 Yes

0 Yes

Volume Up / + Yes

Volume Down / - Yes

Previous Yes

Select Picture Yes

Menu Yes

OK(Enter) Yes

EXIT No

Audio Select No

Sleep Timer No

Mute Yes

T'TEXT Keys TEXT / MIX / TV Yes

CH Up / Page Up Yes

CH Down / Page Down Yes

Red Yes

Green Yes

Yellow Yes

Cyan Yes

TEXT F/T/B Yes

Reveal Yes

TIMED PAGE(SUB PAGE) Yes

CALL / TEXT INDEX Yes

INPUT SELECT Yes

TEXT HOLD Yes

TIME / TXCL Yes

Auto Shut Off Yes
Canal+ No
CATV No
Anti-theft(Back Up 30 Min.) No
Memory(Last CH) Yes
Memory(Last Volume) Yes
BBE No
Auto Search Yes
CH Allocation Yes
Just Clock Function No
Game Position No
CH Label No
VM Circuit No
Full OSD No
Unitext No
Fastext Yes
Top Text No
Premiere No
Comb Filter No

Lines
Auto CH Memory No
Stable Sound No
Auto Set Up No
FBT Leak Test Protect Yes
Power ON Memory Yes
Previous (Quick View) Yes
Panel Lock Yes
Double Focus & Dynamic Focus No
Wss Signal Wide Change No
Virtual Dolby Surround No
Hotel Lock No

A3-3

GENERAL SPECIFICATIONS

G-12 Accessories Owner's Manual Language Swedish, Norwegian, Danish,

w/Guarantee Card
Remote Control Unit Yes
Rod Antenna Yes

Poles 2Pole

Terminal D-type
Loop Antenna

Terminal ­U/V Mixer
DC Car Cord (Center+)
Guarantee Card
Warning Sheet
Circuit Diagram
Antenna Change Plug
Service Facility List
Important Safeguard Yes (Owner's Manual In)
Dew/AHC Caution Sheet
AC Plug Adapter
Quick Set-up Sheet Yes
Battery Yes

UM size x pcs UM-4 x 2 pcs

OEM Brand No
AC Cord
AV Cord (2Pin-1Pin)
Registration Card
PTB Sheet
300 ohm to 75 ohm Antenna Adapter

G-13 Interface Switch Front Power (Tact Sw) No

System Select No

Main Power SW Yes

Sub Power No

Channel Up Yes

Channel Down Yes

Volume Up Yes

Volume Down Yes

Rear AC/DC No

TV/CATV Selector No

Degauss No

Main Power SW No
Indicator Power No

Stand-by No

Stand-by/ON , On Timer Yes(Red , Green)

Stand-by/ON No

On Timer No
Terminals Front Video Input

Audio Input

Other Terminal

Rear Video Input(Rear1)

Video Input(Rear2)

Audio Input(Rear1)

Audio Input(Rear2)

Video Output

Audio Output

Euro Scart(21Pin) No

S-INPUT

Euro Scart(21Pin) Yes ( x1 )

RGB-INPUT Yes ( x1 )

Component Input

Diversity No

Ext Speaker No

DC Jack 12V(Center +) No

VHF/UHF Antenna Input

AC Outlet No

G-14 Set Size Approx. W x D x H (mm) 362 x 360 x 373
G-15 Weight Net (Approx.) 9.5 kg

Gross (Approx.) 11.5kg

Finnish, Turkish

No

No

No
No
No
No
No
No
No

No
No

No
No
No
No
No

Yes
Yes
EAR Phone

No
No
No
No
No
No

No

D Type

( --- lbs)
( ---lbs)

A3-4

GENERAL SPECIFICATIONS

C

dges / 6 Surfaces

G-16 Carton Master Carton

Gift Box Yes

Drop Test

Container Stuffing 866

Content ----

Material --

Dimensions W x D x H(mm) -- x -- x --

Description of Origin Yes

Material Double/Brown

Dimensions W x D x H(mm)

Design As per Buyer's

Description of Origin Yes

Height (cm) 62

440 x 408 x 380

No
Sets
/--

Natural Dropping At 1

E

Sets/40' container

orner / 3

A3-5

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP

Read the following NOTED items before starting work.
*

After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.

*

Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer to Fig. 1-1.)

Connect one end of an Alligator Clip to the metal part of a
flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated Screwdriver,
touch the support of the Anode with the tip of the
Screwdriver.
A cracking noise will be heard as the voltage is discharged.

GND on the CRT

3. After one side is removed, pull in the opposite direction to
remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)

Location of Anode Cap

Fig. 1-3

NOTE

Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.

2.3.Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)

Screwdriver

Alligator Clip

GND on the CRT

Flip up the sides of the Rubber Cap in the direction of the

2.
arrow and remove one side of the support.

(Refer to Fig. 1-2.)

Rubber Cap

CRT

Support

Support

CRT

Fig. 1-1

Fig. 1-2

Fig. 1-4

4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.

Support

CRT

5.6.Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.

Fig. 1-5

B1-1

DISASSEMBLY INSTRUCTIONS

2.

REMOVAL AND INSTALLATION OF
FLAT PACKAGE IC

REMOVAL

Put the Masking Tape (cotton tape) around the Flat

1.
Package IC to protect other parts from any damage.

(Refer to Fig. 2-1.)
NOTE

Masking is carried out on all the parts located within
10 mm distance from IC leads.

When IC starts moving back and forth easily after

3.
desoldering completely, pickup the corner of the IC using
a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)

NOTE

Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.

Blower type IC
desoldering
machine

Masking Tape
(Cotton Tape)

Heat the IC leads using a blower type IC desoldering

2.

IC

machine. (Refer to Fig. 2-2.)

NOTE

Do not add the rotating and the back and forth
directions force on the IC, until IC can move back and
forth easily after desoldering the IC leads completely.

Blower type IC
desoldering machine

Fig. 2-1

Tweezers

IC

Peel off the Masking Tape.4.
Absorb the solder left on the pattern using the Braided

5.
Shield Wire. (Refer to Fig. 2-4.)

NOTE

Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.

Fig. 2-3

Braided Shield Wire

Soldering Iron

IC

Fig. 2-2

IC pattern

Fig. 2-4

B2-1

DISASSEMBLY INSTRUCTIONS

INSTALLATION

Take care of the polarity of new IC and then install the

1.
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 2-5.)

Soldering Iron

Solder temporarily

Supply the solder from the upper position of IC leads

2.

Solder temporarily

sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)

Fig. 2-5

When bridge-soldering between terminals and/or the

4.
soldering amount are not enough, resolder using a Thin­tip Soldering Iron. (Refer to Fig. 2-8.)

Thin-tip Soldering Iron

IC

Fig. 2-8

Finally, confirm the soldering status on four sides of the

5.
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.

Soldering IronSolder

IC

Absorb the solder left on the lead using the Braided

3.

Supply soldering
from upper position
to lower position

Shield Wire. (Refer to Fig. 2-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

IC

Braided Shield Wire

Fig. 2-6

Fig. 2-7

B2-2