Toshiba 1421D2 Schematic

TOSHIBA

SERVICE MANUAL

COLOUR TELEVISION

14N21D2

PRINTED IN UK. 2002 C

SERVICE MODE LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 2 seconds.

Set Key

VOL. (-) MIN 0

VOL. (-) MIN 1

VOL. (-) MIN

VOL. (-) MIN

VOL. (-) MIN

Remocon Key Operations

Reset the user setting items (PICTURE, VOLUME and LANGUAGE) to the initial state
for delivery.

Initialization of the factory.
NOTE:

POWER ON total hours is displayed on the screen.

6

8

9

Refer to the "CONFIRMATION OF HOURS USED".
Can be checked of the INITIAL DATA of MEMORY IC.

Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
Writing of EEPROM initial data.

NOTE: Do not use this for the normal servicing.
Display of the Adjustment MENU on the screen.

Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

Do not use this for the normal servicing.
If you set a factory initialization, the memories are reset such as the
channel setting, and the POWER ON total hours.

CONFIRMATION OF HOURS USED

POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE: If you set a factory initialization, the total hours is reset to "0".

1.

Set the VOLUME to minimum.

2.

Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 2 seconds.

3.

After the confirmation of using hours, turn off the power.

ADDRESS DATA

INIT 01 00
CRT ON 0010

FIG. 1

Initial setting content of MEMORY IC.
POWER ON total hours.

= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)

WHEN REPLACING EEPROM (MEMORY) IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.

NOTE: No need setting for after INI 16 due to the adjustment value.

INI

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F

00 27 07 83 00 06 00

--- 00 00 00 00 60 80 60 68 60
10 80 80 80 BC 00 --- --- ---10 00 --- --- --- --- --- ---

Table 1

Enter DATA SET mode by setting VOLUME to minimum.

1.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.

2.
ADDRESS and DATA should appear as FIG 1.
ADDRESS is now selected and should "blink". Using the VOL. +/- button on the remote, step through the ADDRESS until

3.
required ADDRESS to be changed is reached.
Press OK to select DATA. When DATA is selected, it will "blink".

4.
Again, step through the DATA using VOL. +/- button until required DATA value has been selected.

5.
Pressing OK will take you back to ADDRESS for further selection if necessary.

6.
Repeat steps 3 to 6 until all data has been checked.

7.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

8.

After the data input, set to the initializing of shipping.

Turn POWER on.

9.
Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.

10.
After the finishing of the initializing of shipping, the unit will turn off automatically.

11.

The unit will now have the correct DATA for the new MEMORY IC.

C-1

ELECTRICAL ADJUSTMENTS

1. ADJUSTMENT PROCEDURE

Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.

CAUTION

•

Use an isolation transformer when performing any
service on this chassis.

•

Before removing the anode cap, discharge electricity
because it contains high voltage.

•

When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.

•

When you exchange IC and Transistor for a heat sink,
apply the silicon grease on the contact section of the
heat sink. Before applying new silicon grease, remove all
the old silicon grease. (Old grease may cause damages
to the IC and Transistor).

Prepare the following measurement tools for electrical
adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. Pattern Generator

On-Screen Display Adjustment

1. In the condition of NO indication on the screen.

Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
2 seconds to appear the adjustment mode on the
screen as shown in Fig. 1-1.

TV

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE

Place the set with Aging Test for more than 15 minutes.

1.
Connect the digital voltmeter to TP502.

2.
Set condition is AV MODE without signal.

3.
Adjust the VR501 until the DC voltage is 135 ± 0.5V.

4.

2-2: VCO

1.

Place the set with Aging Test for more than 10 minutes.

2.

Connect the oscillator (38.9MHz) to TP003.

3.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "VCO COARSE".

4.

Press the VOL. +/- button on the remote control until
the "OK" appear on the screen. If the "OK" is not
displayed, select the "+" side on the changed from "+"
to "-".

5.

Press the Page UP button once to set to "VCO FINE"
mode.

6.

Press the VOL. +/- button on the remote control to
select the 5 step down point from the upper limit on the
"OK".
(Example: In case of the "OK" range 30~41, select 36.)

2-3: AGC VOLTAGE

1.

Place the set with Aging Test for more than 15 minutes.

2.

Receive the UHF (63 ± 1dB).

3.

Connect the digital voltmeter to TP002.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "RF AGC".

5.

Press the VOL. +/- button on the remote control until the
digital voltmeter is 2.5 ± 0.05V.

35 H. POSI OSD 128

Fig. 1-1

2.3.Use the Channel button (0-9) or Channel UP/DOWN
button on the remote control to select the options
shown in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.

FUNCTION

NO.

CUT OFF

00

RF AGC

01

AGC GAIN

02

R DRIVE

03

R CUTOFF

04

G DRIVE

05

G CUTOFF

06

B DRIVE

07

H POSI (50)

08

V POSI (50)

09

V POSI (60)

10

V SIZE (50)

11

V SIZE (60)

12

VCO COARSE

13

VCO FINE

14

VCO COARSE L1

15

VCO FINE L1

16

BRIGHT CENT

17

BRIGHT MAX

18

BRIGHT MIN

19

NO.

FUNCTION

20

TINT

21

SHARP

22

CONTRAST CENT

23

CONTRAST MAX

24

CONTRAST MIN

25

COLOR CENT

26

COLOR MAX

27

COLOR MIN

28

M R CUT OFF

29

M G CUT OFF

30

M B CUT OFF

31

CVBS OUT

32

APR THRESHOLD

33

BELL FILTER

34

BANDPASS

35

H POSI OSD

36

V POSI OSD

37

H POSI TEXT

38

V POSI TEXT

39

H POSI (60)

Fig. 1-2

2-4: CUT OFF

1.

Set condition is AV MODE without signal.

2.

Using the remote control, set the brightness and
contrast to normal position.

3.

Place the set with Aging Test for more than 15 minutes.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (00) on the remote control to
select "CUT OFF".

5.

Adjust the Screen Volume until a dim raster is obtained.

2-5: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.

1.

Place the set with Aging Test for more than 10 minutes.

2.

Receive the gray scale pattern from the Pattern
Generator.

3.

Using the remote control, set the brightness and
contrast to normal position.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "R DRIVE".

5.

Press the Page UP/DOWN button on the remote control
to select the "R DRIVE", "G DRIVE", "M R CUTOFF" or
"M G CUTOFF".

6.

Adjust the VOL. +/- button on the remote control to
whiten the R DRIVE, G DRIVE, M R CUT OFF, and M G
CUT OFF at each step tone sections equally.

7.

Perform the above adjustments 5 and 6 until the white
color is looked like a white.

D-1

ELECTRICAL ADJUSTMENTS

2-6: FOCUS

Receive a 70dB monoscope pattern.

1.

Turn the Focus Volume fully counterclockwise once.

2.

Adjust the Focus Volume until picture is distinct.

3.

2-7: HORIZONTAL POSITION

1.

Receive the monoscope pattern from the Pattern
Generator.

2.

Using the remote control, set the brightness and
contrast to normal position.

3.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (08) on the remote control to
select "H POSI (50)".

4.

Press the VOL. +/- button on the remote control until
the SHIFT quantity of the OVER SCAN on right and left
becomes minimum.

5.

Receive the monoscope pattern of NTSC. (Audio Video
Input)

6.

Using the remote control, set the brightness and
contrast to normal position.

7.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (39) on the remote control to
select "H POSI (60)".

8.

Press the VOL. +/- button on the remote control until
the SHIFT quantity of the OVER SCAN on right and left
becomes minimum.

2-8: VERTICAL SIZE

Receive the monoscope pattern from the Pattern

1.

Generator.
Using the remote control, set the brightness and

2.

contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and

3.

press the channel button (11) on the remote control to
select "V SIZE (50)".
Adjust by using the VOL. +/- button on the remote

4.

control so that the Up/Down OVER SCAN Quantity
becomes equal to the Right/Left OVER SCAN Quantity.
Receive a broadcast and check if the picture is normal.

5.

Receive the monoscope pattern of NTSC. (Audio Video

6.

Input)
Using the remote control, set the brightness and

7.

contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and

8.

press the channel button (12) on the remote control to
select "V SIZE (60)".
Adjust by using the VOL. +/- button on the remote

9.

control so that the Up/Down OVER SCAN Quantity
becomes equal to the Right/Left OVER SCAN Quantity.

2-10: BRIGHT CENT

1.

Receive the PAL black pattern*. (RF Input)

2.

Using the remote control, set the brightness and
contrast to normal position.

3.

Place the set with Aging Test for more than 15 minutes.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (17) on the remote control to
select "BRIGHT CENT".

5.

Press the VOL. +/- button on the remote control until
the screen begin to shine.

6

Receive the PAL black pattern*. (Audio Video Input)

7.

Set to the AV mode. Then perform the above
adjustments 2~5.

*The Black Pattern means the whole black raster signal.

Select the "RASTER" of the pattern generator, set to
the OFF position for each R, G and B.

2-11: CONTRAST CENT

1.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "CONTRAST CENT".

2.

Press the VOL. +/- button on the remote control until
the contrast step No. becomes "35".

3.

Receive a broadcast and check if the picture is normal.

4.

Set to the AV mode. Then perform the above
adjustments 1~3.

2-12: COLOR CENT

1.

Receive the PAL color bar pattern. (RF Input)

2.

Using the remote control, set the brightness, contrast
and color to normal position.

3.

Connect the oscilloscope to TP023.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (25) on the remote control to
select "COLOR CENT".

5.

Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 100% and
0% is set to 5 scales on the screen of the oscilloscope.

6.

Press the VOL. +/- button on the remote control until
the red color level is adjusted to 100 ± 10% of the
white level. (Refer to Fig. 2-1)

7.

Receive the PAL color bar pattern. (Audio Video Input)

8.

Set to the AV mode. Then perform the above
adjustments 2~6.

2-9: VERTICAL POSITION/VERTICAL LINEARITY

Receive the monoscope pattern from the Pattern

1.

Generator.
Using the remote control, set the brightness and

2.

contrast to normal position.
Adjust the VR401 until the horizontal line becomes fit to

3.

the notch of the shadow mask.
Adjust the VR420 until the SHIFT quantity of the OVER

4.

SCAN on upside and downside becomes minimum.

100%

Fig. 2-1

D-2

ELECTRICAL ADJUSTMENTS

2-13: TINT

1.

Receive the NTSC color bar pattern. (Audio Video Input)

2.

Using the remote control, set the brightness and contrast
to normal position.

3.

Connect the oscilloscope to TP024.

4.

Activate the adjustment mode display of Fig. 1-1 and
press the channel button (20) on the remote control to
select "TINT".

5.

Press the VOL. +/- button on the remote control until the
section "A" becomes a straight line. (Refer to Fig. 2-2)

"A"

Fig. 2-2

2-14: Confirmation of Fixed Value (Step No.)

Please check if the fixed values of the each adjustment
items are set correctly referring below.

NO.

FUNCTION

02

AGC GAIN

04

R CUTOFF

06

G CUTOFF

07

B DRIVE

09

V POSI (50)

10

V POSI (60)

18

BRIGHT MAX

19

BRIGHT MIN

20

TINT

21

SHARP

23

CONTRAST MAX

24

CONTRAST MIN

26

COLOR MAX

27

COLOR MIN

30

M B CUT OFF

31

CVBS OUT

32

APR THRESHOLD

33

BELL FILTER

34

BANDPASS

35

H POSI OSD

36

V POSI OSD

37

H POSI TEXT

38

V POSI TEXT

*To check for the fixed values of the RF (60Hz), indicate

the adjustment mode screen while input the 60Hz video
signal.

RF

00
00
00
45
08
08
30
10
32
02
63
10
45
10

127

31
00
00
00

126

50

122

58

AV

---

---

---

---

---

--­30
10

ADJ.

02
63
10
45
10

---

---

---

---

---

---

---

---

---

D-3

ELECTRICAL ADJUSTMENTS

3.

PURITY AND CONVERGENCE
ADJUSTMENTS

NOTE

Turn the unit on and let it warm up for at least 30

1.

minutes before performing the following adjustments.
Place the CRT surface facing east or west to reduce the

2.

terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.

3.

3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)

Tighten the screw for the magnet. Refer to the adjusted

1.

CRT for the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
Receive the green raster pattern from the color bar

2.

generator.
Slide the deflection yoke until it touches the funnel

3.

side of the CRT.
Adjust center of screen to green, with red and blue on the

4.

sides, using the pair of purity magnets.
Switch the color bar generator from the green raster

5.

pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch pattern

6.

on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the

7.

pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white

8.

by repeating steps 6 and 7.

3-2: PURITY
NOTE

Adjust after performing adjustments in section 3-1.

1.

Receive the green raster pattern from color bar
generator.

2.

Adjust the pair of purity magnets to center the
color on the screen.
Adjust the pair of purity magnets so the color at the
ends are equally wide.

3.

Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole
screen is green.

4.

Confirm red and blue colors.

5.

Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.

DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW

3-3: STATIC CONVERGENCE
NOTE

Adjust after performing adjustments in section 3-2.

1.

Receive the crosshatch pattern from the color bar
generator.

2.

Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of
4 pole magnets.

3.

Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.

3-4: DYNAMIC CONVERGENCE
NOTE

Adjust after performing adjustments in section 3-3.

1.2.Adjust the differences around the screen by moving
the deflection yoke upward/downward and right/left.

(Refer to Fig. 3-2-a)

Insert three wedges between the deflection yoke and
CRT funnel to fix the deflection yoke.

(Refer to Fig. 3-2-b)

R G B

R
G
B

UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT

WEDGE

WEDGE POSITION

R
G
B

Fig. 3-2-a

WEDGE

WEDGE

Fig. 3-2-b

R G B

Fig. 3-1

PURITY MAGNETS
6 POLE MAGNETS

4 POLE MAGNETS

D-4

ELECTRICAL ADJUSTMENTS

4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)

CD803

J701

FB401

CP401

CRT

DEGAUSS

COIL

CP803A

VR501

L503

CP502

VR420

VR401

TP502

R527

TP002

CP101

TP003

CP802A

TU001

CP1001

CD802

TP023

CD802B

R805

TP024

R807

CD803B

CRT PCB

J801

CP801

CP806

AC IN

MAIN PCB

SPEAKER

CD801
GND CRT

D-5

Q506

P.FAIL

REG. 6V IC
IC502 KIA7806API

1

OS101

1

RESET IC
IC102 PST3231NR

REG. 9V IC
IC503 KIA78R09API

4

1

T501

CH UP

CH DOWN

VOL UP

VOL DOWN

Q510, Q511

P.CON SW.

1

MICON W/T.TEXT IC
IC101 OECF013A

A_MUTE

3

56

KEY IN

REMORT

1

POWER

10

POWER FAIL

55

RESET

2

ON_TIMER

49

Q501

POWER

Q502

POWER

OSD_B

OSD_FB

OSC IN

OSC_OUT

AV1

Q103

LED SW

Q102

17OSD_R
16OSD_G

15

18

20SCL
19SDA

51

50
42
41V-SYNC

40H-SYNC

LED SW

D501~D504

RECTIFIER

X101
4 MHz

SDA

5

D101

TU001

SCL

4

9

11

AGCIF

1

Q201

VIF PRE. AMP

MEMORY IC
IC199 S-24C16AFJA-TB-01

6

SCL
SDA

5

BLOCK DIAGRAM

CF202

SAW FILTER

4

1

5

36
35
34
37

42
25

51
52
20

28
27

26
49

IC401 TDA8174A

V-DRIVE IC

413

CHROMA IC
IC201 STV2246E

RF_AGC_OUT

8

PIFIN2

7

6

PIFIN1

OSD_R
OSD_G
OSD_B
OSD_BK

X1/VAMP/CHR_OUT
B_EXT/U_EXT

SCL
SDA
CVBSIN2

BLK_EXT

R_EXT/V_EXT

G_EXT/Y_EXT

LBF/SSC

10

2

AUDIO_OUT

FM_OUT

CVBSIN1

INT_CVBS_OUT

XTAL1

VERT

B.OUT

G.OUT

H.OUT

Y/CVBS_IN3

R.OUT

EXT_AUDIO_IN

48
49

55
11
18

13
40

47
30

31

48

22

32
14
46BCL/SAF

IC1001 AN7511

2

SOUND AMP

4

X601

4.433619MHz

Q402

H. DRIVE

Q401

H. OUTPUT

J1001

HEADPHONE_JACK

2
3
1

8

IC

5
6

AUDIO SW (MONO) IC
IC703 NJM2233BM-T1

2
7

1
3

FRONT AUDIO
J703

SP1001

SPEAKER

2

FRONT AUDIO
J702

2

Q802

Q803

Q801

RED OUT

GREEN OUT

BLUE OUT

397

Heater

F8

4

V801
CRT

RGB

E-1

15

13

17

5
3

IC504 LTV-817M-VB

FEED BACK

8

Q507

FEED BACK
SWITCHING

AC IN

F501

L503

DEGAUSS COIL

L501

2
4

1
3

J701

2

16

15
11

7

19
20

6
1
3

FB401

3
1

FBT

7
2

DY

10

F
S

HV

5

E-2