TV4K-NICAM / A2 STEREO

COLOUR TELEVISION RECEIVER

SERVICE MANUAL

SECIFICATIONS

SYSTEM PAL/SECAM,B/G,D/K, I GERMAN STEREO,NICAM

POWER INPUT AC 170-260v(50/60Hz) POWER CONSUMPTION 100W AERIAL IMPEDANCE 75OHM UNVALANCED TUNER VOLTAGE SYNTHESIZER TUNING RECEICING CHANNELS VHF-L E2-S10

VHF-H E5-S41 UHF E21-E69

PROGRAMME MAX.99 PROGRAM MEMORIES PICTURE TUBE 28”,110° SOUND OUTPUT 5W X2 SPEAKER 8W 8 OHM ×2 AV JACKS AV SCART ×1

FULL SCART ×1

CAUTION: Before servicing the chassis, read the “Safely Precaution”.“X -Ray radiation Precaution” and “Product Safety Notice” on Page 2 ofthis manual.

X-RAY RADIATION PRECAUTION1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To

Avoid such hazards the high voltage must not be specified limit. The normal value ofthe high voltage of this receiver is App. 28.5KV at zero beam current (minimumbrightness) under 230V AC power source. The high voltage must not under anycircumstances exceed 30KV.

2. Each time a receiver requires servicing the high voltage should be checked followingthe HIGH VOLTAGE CHECK procedure in this manual. It is recommended thereading of the high voltage be recorded as a part of the service record. It isimportant to use an accurate and reliable high voltage meter.

3. The primary source of X -RAY RADIATION in this TV receiver is the picture tube. Forcontinued X-RAY RADIATION protection, the replacement tube must be exactly thesame type tube as used in this TV receiver.

4. Some parts in this receiver have special safety-related characteristics for X-RAYRADIATION protection. For continued safety, parts replacement should beundertaken only after referring the PRODUCT SAFETY NOTICE below.

SAFETY PRECAUTION

WARNING: Service should not be attempted by anyone unfamiliar with the necessary Precautions on this receiver.The following are the necessary precautions to be observed before servicing thischassis.1. Since the power supply circuit of this receiver is directly connected to the AC

power line. An isolation transformer should be used during any dynamic service toavoid possible shock hazard.

2. Always discharge the picture tube anode to the CRT conductive coating beforehandling the picture tube. The picture tube is highly evacuated and if broken, glassfragments will be violently expelled. Use shatterproof goggles and keep picture tubeaway from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protectivedevices are put back in place, such as: nonmetallic control; knobs, insulating covers,shields, isolation resistor-capacitor, network, etc.

4. When replacing parts or circuit boards, disconnect the power cord.5. When replacing a high voltage resistor (metal oxide resistor) on circuit hoard,

keep the resistor 10mm(1/2 in.) away from circuit board.6. Connection wires must be kept away from components with high voltage or high

temperature.7. If any fuse in this TV receiver is blown, replace it with the FUSE specified in the

chassis parts list.8. The receiver is designed to operate with 230V(50Hz) AC mains.

PRODUCT SAFERY NOTICE

Many electrical and mechanical parts in this chassis have special safety-relatedcharacteristics are often passed unnoticed by a visual inspection and the X-RAYRADIATON protection afforded by them cannot necessarily be obtained by usingreplacement components rated for higher voltage. The use of substitute replacementparts that do not have the same safety characteristics as specified in the parts list maycreate shock, fire, X-RAY RADIATION or other hazards.

GENERAL ADJUSTMENT

AUTOMATIC DEGAUSSINGAn automatic degaussing coil is attached around the picture tube, degaussing the tubeproperly in about one second after the set is switched on. If the receiver is moved orfaced on a different direction, the power must be switched off at least 15 minutes inorder that the automatic degaussing circuit operated properly. External is necessary ifthe automatic degassing proves ineffective when the set is moved.

B+ ADJUSTMENT

CAUTION: To avoid X-ray hazards, B+ voltage must be set in the scale of 140V+/-0.5V.

1. Make sure the AC power supply is 230V, 50Hz.2. Switch on the TV receiver, tune in an active channel.3. Measure the voltage between C641 on Main P.C. Board DC voltmeter.4. Set contrast, brightness, color to maximum.5. Adjust VR631 on Main P. C. Board for B+140V+/-0.5V voltage reading.

HIGH VOLTAGE CHECK

CAUTION: There is no high voltage adjustment in this chassis, B+140V voltagedirectly relates to the high voltage. The high voltage does not exceed 30KV under anyconditions.1. Connect an accurate high voltage meter to the second cap of the picture tube.2. Turn on the receiver, set brightness and contrast to minimum (Zero beam current).3. Make sure the high voltage does not exceed 30KV.4. NO matter whether the luminance, contrast and chrominance controls are set to

maximum or minimum, the high voltage must be kept under 30KV.

FOCUSING

Receive a TV test pattern signal; adjust controls for optimum picture. Adjust FocusControl for a well-defined, sharpest display in the center area of the screen.

ADJUSTMENT AND SERVICING THE VHASSISSERVICE MODE

To enter the service mode, a special remote control which contains an additionalSERVICE key must be used to setup the chassis in producing. See the illustration.Press the ‘SERVICE’ key on remote control, TV will display service menu as followingtable 1. To select the parameter requiring adjustment, use the ‘P+/P-’ keys. To adjustthe selected parameter, use the ‘V+/V-’ keys. To quit the service mode, press the ‘P.P.’key on remote control when in the service mode.

Table 1Parameter ValueRed Gain 45 Fix valueDC Red 063 Fix valueGreen Gain 45 Fix valueDC Green 063 Fix valueBlue Gain 45 Fix valueDC Blue 063 Fix valueApr Threshold 15 Fix valueLogo 6------------ Fix value

To enter the table 2, press the ‘OK’ key for the first time on the remote control while inabove service mode.

Table 2Service V3.0Parameter Val

ueFix value

Tuner AGC 22 Fix valueH position 32 adjustedVPOS 50 10 not adjustedVPOS 60 10 not adjustedVAMP 50 47 not adjustedVAMP 60 52 not adjustedBright max 63 Fix valueBright min 00 Fix valueSub Tint 32 Fix valueVCO Coarse 05 Fix valueVCO Fine 063 056-066VCO Coarse L1 05 FranceVCO Fine L1 080 France

To enter the table 3, press the ‘OK’ key forthe second time on the remote controlwhile in above service mode.Table 3STV9306SAW50 58SAW60 61SH 22SC 05CC 10EW VDC 05EW AMP 13EW SHAPE 00EW TRAP 18To enter the table 4, press the ‘OK’ key forthe third time on the remote control while inabove service mode.Table 4DesignParameter ValueAGC gain 00Option 1 50Option 2 00Option 3 07Option 4 27Option 5 00ST Ttext 00

1

5

9 -/--

6 7 8

¢ñ ¢ò/

2 3 4

H POS OSD 001V POS OSD 01H POS TXT 066V POS TXT 04OPTION1:B5=P/N/S Crystals application (0=2 crystals, 1=1 crystal)B4=Cutoff Loop (0= OFF, 1=ON)B3=Safety_Reset (0=Active, 1=non)B2=Super Tuner (0=OFF, 1=ON)B1=Sound Demodulation (0= Intercarrier/MONO, 1=QSS/NICAM)B0=Logo Display (0=OFF, 1=ON)OPTION2: (It’s better to keep the default setting option2=0)B5=Half_Contrast (0=OFF, 1=ON)B4=Color 6db (0=OFF, 1=ON)B3=APR Feature (0=ON, 1=OFF)B2=Black Stretch (0=ON, 1=OFF)B1=Auto Flesh (0=ON, 1=OFF)B0=Coring (0=ON, 1=OFF)OPTION3:B5=AVL (0=OFF, 1=ON)B4=PIF Over modulation (0=OFF, 1=ON)B3=Market_France-SECAM L/L’ (0=OFF, 1=ON)B2=Manual/Auto Cutoff (0=Manual, 1=Auto Cutoff)B1=Mute pin Low/High To control the speaker (0=Low, 1=High)B0=TDA7449/TDA7439 (0=TDA7449, 1=TDA7439)OPTION4:B4=SCART2 (0=OFF, 1=ON)B3=RGB (0=OFF, 1=ON)B2=SVHS (0=OFF, 1=ON)B1=AV2 (0=OFF, 1=ON)B0=AV1 (0=OFF, 1=ON)

OPTION5 and ST Ttext is for teletext setting only. It normally could not be changed. Ifit’s necessary to adjust the OPTION 5, please read the following information beforeadjustment.A. For CPUs with English, French, German, Polish or English, French, German, Turkish,

Please refer to the setting as below.1. If OPTION 5 = 00, then the TEXT languages like "ENGLISH, FRENCH, SWEDISH,TURKISH, GERMAN, PORTUGUESE, ITALIAN, RUMANIAN " can be decoded.2. If OPTION 5 = 02, then the TEXT languages like "POLISH, FRENCH, ESTONIAN,CZECH, GERMAN, SERBIAN, LETTISH, RUMANIAN " can be decoded.3. If OPTION 5 = 04, then the TEXT languages like "ENGLISH, FRENCH, SWEDISH,CZECH, GERMAN, PORTUGUESE, LETTISH, RUMANIAN " can be decoded.4. If OPTION 5 = 06, then the TEXT languages ENGLISH, FRENCH, SWEDISH, TURKISH,GERMAN, PORTUGUESE, LETTISH, RUMANIAN can be decoded.B. For coming new OTP/CPU with English, Russian, Czech, Polish, the setting of the OPTION5 will be changed as below.1. If OPTION 5 = 00, then the TEXT languages like "ENGLISH, FRENCH, SWEDISH,CZECH, GERMAN, PORTUGUESE, ITALIAN, RUMANIAN " can be decoded.2. If OPTION 5 = 02, then the TEXT languages like "ENGLISH, RUSSIAN, SWEDISH,TURKISH, GERMAN, PORTUGUESE, ITALIAN, RUMANIAN " can be decoded.3. If OPTION 5 = 04, then the TEXT languages like "POLISH, RUSSIAN, SWEDISH,CZECH, GERMAN, SERBIAN, ITALIAN, RUMANIAN " can be decoded.4. If OPTION 5 = 06, then the TEXT languages like "POLISH, RUSSIAN, SWEDISH,CZECH, GERMAN, PORTUGUESE, ITALIAN, RUMANIAN can be decoded.Normally, it is supposed not to set OPTION 5 = 01. If you set the OPTION 5 = 01, then the font

can be switched by press key MENU on remote control in TEXT mode for TV4K. If you setOPTION 5 = 00, 02, 04, 06, then there is no any activity while press MENU in TEXT mode.Please check.

A.F.C. ADJUSTMENTRemoving any R.F. signal source and prevent any stray signal source from enteringthe tuner by shorting the tuner input inner contact to the out screen.Inject the 38.9 MHZ carrier into the tuner IF output pin (pin 11).Select the parameter‘VCO Coarse’ in the service mode (Table 2).The ‘VCO Status…’will appear on thescreen. Then press the ‘AV’ key on remote control, the CPU will adjust automaticallyuntil the ‘VCO Status OK’ appears on the screen. If this can not be achieved, adjustthe T201 first and then press the ‘AV’ key on remote control, the CPU will adjustautomatically once again until the ‘VCO Status OK’ appears on the screen.

GEOMETRYTo adjust the picture position and vertical size, select the appropriate parameter in the servicemode and adjust as necessary.

Remote control35 DIRECTIVTY 6m(MIN) 8m(NOR

)OK

36 DIRECTIVTY 30°FROM LIGHT AXIS 5m(MIN) 7m(NOR)

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FBI

RIGI

BI

R015A1K

R0151K

D001AHFT505M

GREEN RED

CN

001/

5

CN001/3

CN001/4

CN

001/

2

CN001/1

+8V

RESET

E0

E1

E2

GN

D

SDA

SC

L

WC

V

CC

IC001ST24C01

C009100uF

4

5

3

2

1

3

4

51

2

D012

1N4148

+8V

C32747P

C32847P

C812A100u/160V

R801

1R/2W

+12VC6

00A

0.22

uF/4

00V

C61

70.

015u

5

8

2

3

9

13

16

17

9

15

C657

0.1u

R637

180K

C654

470UF/16V

21

3

IC605

7805C652

0.1u

C675

470UF/16V

+8V21

3

IC602

7808C6900.1u

C674

0.1u

C656

100UF/16V21

3

IC606

7812C6510.1u

Q683B892

R685

10K

C655

10UF

R650

1K

Q401C1815

R404470

LQ0310UH

C417

0.1u

C45

01n

C45

11n

C45

2

1n

C453

1n

C4080.1u

C40710UF

R341

10K+12V

R076

10

C041

10UF

C067

10UF

BL BH

BU

C2331n

F601

T3.15Al250V AC230V

50Hz

XS600A

SP601

SP602

C34020.39u

D34024148

D34044148

D34014148

D34

0341

48

C34010.39u

C16118PF

R317

1K

C50510UF

VCOIL

HCOIL

R129

68K

CN101

XS804

R808A

8K2/2W

60MA

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15161718192021222324252627282930

INL

MX

OR

INR

MIN

R

MO

R

BIR

BOR

BIL

BOL

MO

L

MIL

RO

T

LOT

RIN

4

RIN

3

RIN

2

RIN

1

LIN

1

LIN

2

LIN

3

LIN

4

MX

OL

AG

ND

VS

CRF

SDA

SCL

DG

ND

TRR

TRL

IC401

TDA

7439

142 22

21113241 40 39 38 37 36 35 34 33 31 23

20

avcc

1918171615

cap5

2 3 4 5 6 7 8 9 10

gnd4

12 13 14

30 29 28 27 26 25 24

rese

t

sdws

sck

ncncncncdcl

alin

arin

cap2

cap1

slout

srou

t

av5a

alou

t

arou

t

xout

srin

slin

xin

nuca

p8

min

sda

scl

mou

t

gnd3

nccap3

av5b

cap6

reg

dvdd

5sif

cap7

gnd1

gnd2

IC40

0

STV8203

S-SW

2

R0166K8

S-SW2

NOTE: SUBJECT TO CHANGE WITHOUT NOTICE

RQ11

1K

RQ13

1K

CQ26

10UFCQ27

10UF

RQ101K

RQ12 1K

CRITICAL PARTS

CVBS

OU

T1

R433

A56

0

R434

A56

0LORO

R020

6K8

+5V

OSC

G

B

NC

NC

NC

NC

S1

S-SW1

S-SW2

ON/OFF

NC

MUTE

NC

RESET

IRIN1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

43

44

45

46

47

48

49

50

51

52

53

54

55

56

S0

42

19

20

21

22

23

24

25

26

27

28

41

29

30

31

32

33

34

35

36

37

38

39

40

TXCF

CVBSO

AVDD2

JTMS

WSS

TELETEXT

AGND

GND

JTRETO

PXFM

AVDD1

HSYNCR

FB

SDA

SCL

VDD

JTDO

WSCF

WSCR

AVDD3

TEST0

MCFM

JTCK

KB INPUT

NC

VT

STDBY LED

STDBY LED

OSC

VOL PWM

VSYNC

NC

SAW-SW2

NC

SAW-SW1

BSW2

BSW1

NC

R23

ST92195PLSH

K9650M

K2955M