EPT-1409NF

EPT-2109NF

EPT-2119PF

SERVICE MANUAL

1

Contents

1. Safety Instructions ( 2 )

2. Signal Block Diagram ( 4 )

3. Adjustment Test ( 6 )

4. Trouble Shooting ( 9 )

5. Spare Part list ( 14 )

6. Circuit Diagram ( 15 )

2

1. Safety Instructions

1.1 X-ray Radiation Precaution Excessive high voltage can produce potentially hazardous X-ray radiation. To avoid such hazards, the high voltage must not be above 31.0KV(14") or 35.0KV(21") under any conditions. The normal value of the high voltage of this television is 22.5KV(14") or 26.5KV(21") at max beam current (maximum brightness) under a 90-260V, 50/60HZ AC power source.

1.2 Safety PrecautionWARNING: Service should not be attempted by anyone unfamiliar with the necessary precautions on this television. The followings are the necessary precautions to be observed before servicing. 1). Since the chassis of this television is directly connected to the AC-power line (HOT chassis), an isolation transformer should be used during any dynamic service to avoid possible shock hazard. 2). Always discharged the picture tube anode to the CRT conductive coating before handing the picture tube. The tube is highly evacuated and, if broken, glass fragments will be violently expelled. Use shatterproof goggles and keep picture tube away from the body while handing. 3). When replacing a chassis in the cabinet, it always is certain that all the protective devices are put back in place, such as non-metallic control knobs, insulating covers, shields isolation resistor-capacitor network, etc.

4). Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet such as terminals, screws, metal overlays control shafts, etc., to insure that the set is safe to operate without danger of electrical shock. 1.3 Product Safety NoticeMany electrical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement, rated for higher voltage, wattage, etc. Replacement parts with special safety characteristics must be identified in

3

this manual and its parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radiation of other hazards.

1.4 Automatic DegaussingA degaussing coil is mounted around the picture tube, so that external degaussing after mobbing the TV should be unnecessary. But the receiver must be properly degaussed upon installation. The degaussing coil operates for about 1 second after the power is switched ON. If the set is moved or turned in a different direction, the power should be OFF for at least 15 minutes. If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube, the sides and the front of it, slowly withdraw the coil to a distance of about 6 feet before turning power OFF.

4

2. Signal Block Diagram

This chassis is consisted of main chip LA76812 controlled by Sanyo I2C bus and CPU LC863232A.

LA76812 is a performance and quality IC including PIF, SIF, AFC, V/C/D, etc circuits.

TDA7056B used in BTSC sound system is a power amplifier. CXA2104S is a BTSC decode function IC.LA4225A used in MONO sound system is another power amplifier LA78040 is used for vertical power amplifier.The block diagram with MONO sound system is shown as follows:

CRT

SCREEN/

FOCUS

HV

110V

V-out

IF IN Ext VIDEO IN

RF AGC

Ext AUDIO IN

N201 LA76812 R/G/B INSDASCL

TV audio

AUDIO OUT Select Video V OUT FBP H OUT R/G/B

SDA1 SCL1 Video

N101 CPU LA863232A

R/G/B OUT SDA0SCL0

AV1/AV2TV./AV

H V

FS TUNER

SAWFilter

CRT PCB

Audio1

Video1

H IN H OUT

V IN N401 LA78040

DY

POWER UNIT

12V

17V

27V

8V

N601 LA4225A

N8014053

Video2

Audio2 AV1/AV2

Select video

A-outN3054053

TV/AV

5

The block diagram with BTSC function is shown as follows:

Nota: si no puede entrar con recall intentelo con disply o mute.

IF IN

RF AGC Ext VIDEO IN

N201 LA76812 R/G/B INSDASCL

Select Video

TV Audio V OUT FBP H OUT R/G/B

SDA1 SCL1 Video

N101 CPU LA863232A

R/G/B OUT Volume-R SDA0Volume-L SCL0

AV1/AV2TV./AV

H V

FS TUNER

SAWFilter

CRT PCB

A1-L

Video1

H IN H OUT

V IN N401 LA78040

DY

POWER UNIT

12V

15V

27V

8V

N801 4053A-LA-R

A1-R

Video2

AV1/AV2

Select video A2-L

N305 4053

A-LA-R

TV/AV

SCREEN/

FOCUS

CRT

HV

A2-R

V-out

L-out

R-out

N307 CXA2104S --------- TV-L TV-R

N304 TDA7056B

N304 TDA7056BL

R

110V

6

3. MENU TECNICO

3.1 PRUEBA DE AJUSTE

3.1.1 METODO DE ACCESO AL MODO DE SERVICIOUsando el control remoto realize los siguientes pasos:

1. presione la tecla RECALL del control remoto y la tecla volumen menos(V-) en el TV al mismo tiempo”.Aparecera en la pantalla del TV la palabra FACTORY, indicando que se encuentra en modo de servicio.

2. Para ingresar al modo de B/W (blanco balance)vuela a presionar RECALL en el control remoto y volumen menos en el TV al mismo tiempo

3. Para los ajustes de color, vertical, vuelva a presionar RECALL en el control remoto y volumen menos en el TV al mismo tiempo

4. Para volver a la posición original de TV presione la TECLA RETURT en el control remoto y apague el TV.”.

NORMAL TV FACTORY B/W Balance

SETUP ADJUST3.1.2 MODO DE AJUSTE DEL BLANCO BALANCE B/W.

a. Line ModeDespués de estar en el modo de servicio ,UD puede RGB bias, presionado "0" para decrecer "S-BRI"; presionando "1" para incrementar " S-BRI ". Presionando "2" para decrecer "R-BIA"; presionando "3" para incrementar "R-BIA". Presionando "4" para decrecer "G-BIA"; presionando "5" para incrementar "G-BIA". Presionando "6" para decrecer "B-BIA"; press "7" para incrementar "B-BIA".

b. B/W Balance AdjustsDespués de ajustar RGB bias a, presione "Mute" para retornar al modo " B/W BALANCE ", entonces presione CH+ or CH- para seleccionar los item de la tabla de " B/W BALANCE ", presione VOL+ or VOL- para seleccionar los item.

B/W Balance

7

B/W ADJUST

2). ADJUST Mode (Preset related to tube used)En el modo "ADJUST", ud puede ajustar size, picture position, sub picture status, OSD position, AGC status etc. , press CH+ or CH- to select items in the " ADJUST " Table, press VOL+ or VOL- to adjust selected item.

ADJUST

Item Range Preset Note Item Range Preset Note

00 H.PHASE 0～31 11 11 NT.V.SC 0～31 -02

01 NT.H.PHASE 0～31 2 12 RF.AGC 0～63 20

02 H.BLK.LEFT 0～7 7 13 VOL.OUT 0～127 100

03 H.BLK.RIGHT 0～7 7 14 OSD H.POSI 0～63 25

04 V.SIVE 0～127 73 15 OSD V.POSI 0～63 13

05 V.LINE 0～31 12 16 INPUT LEVEL 0～15 08

06 V.POSI 0～63 22 17 SPECTRAL 0～63 26

07 V.SC 0～31 6 18 WIDEBAND 0～63 25

08 NT.V.SIVE -31～31 -02 19 STEREOVCO 0～63 1

08 NT.V.LINE -31～31 -02 20 SAP.VCO 0～63 51

10 NT.V.POSI 0～63 26

4). SETUP ModeEn el modo "SETUP", you Ud puede seleccionar las opciones, AV/TV opcion, OSD opcion, power ON/OFF opcion etc. , presione CH+ o CH- para selecionar los item de la Tabla del " SETUP " ,presionando VOL+ o VOL- para seleccionar los ajustes .

Items Display Bus Data Range1 S-BRI Sub-Brightness 0~127

2 C-B/W C-B/W 0~3

3 B-DRV B-Driver 0~127

4 G-DRV G-Driver 0~15

5 R-DRV R-Driver 0~127

6 B-BIA B-Bias 0~254

7 G-BIA G-Bias 0~254

8 R-BIA R-Bias 0~254

ADJUST

ITEM .00H.PASE 8

SETUP

ITEM .06BLK.STR.DEF 0

8

SETUP ITEM RANGE PERSET NOTE ITEM RANGE PERSET NOTE

00 LA76814/LA76812 0～1 1 24 VOL.FIL.OFF 0～1 0

01 SAP IC SELECT 0～1 1 25 VIF.SYS.SW 0～3 1

02 SUB CONT 0～31 31 26 VIDEO.LEVEL 0～15 7

03 SUB CORLOR 0～63 25 27 FM.LEVEL 0～31 25

04 SUB SHARP 0～63 31 28 POWER OPTION 0～3 0

05 SUB TINT 0～63 31 29 POWER FLAG 0～1 0

06 BLK.STR.OEF 0～3 0 30 SEARCH CHECK 0～1 0

07 AFC GAIN 0～1 1 31 SEARCH SPEED 0～1 1

08 V. SETUP 0～1 1 32 AV.OPTION 0～3 2

09 CD.MODE 0～7 0 33 POSION L/R 0～1 1

10 DIGITAL OSD 0～1 0 34 BLUE.BACK 0～1 1

11 OSD CONT 0～127 55 35 BLACK.BACK 0～1 1

12 GRAY MOD 0～15 1 36 STEREO OPTION 0～1 1

13 B.GAM.SEL 0～15 3 37 WOOF/H.PHONE 0～1 0

14 RG.GAM.DEF 0～15 1 38 WOOF VOL.OPT 0～1 1

15 FBDBLK.SW 0～15 1 39 SENSITIVITY 0～1 0

16 BRIGHT.ABL.TH 0～1 6 40 V.MUTE P.OFF 0～1 0

17 EMG.ABL.DEF 0～15 1 41 CCD OPTION 0～1 1

18 BRIGHT.ABL.DEF 0～15 1 42 V-CHIP OPTION 0～1 1

19 MID.STP.DEF 0～3 1 43 PASS WORD.DPT 0～1 1

20 R-Y/B-Y G.BL 0～15 15 44 COMB.OPTION 0～1 0

21 R-Y/B-Y. ANG 0～15 15 45 TUNER OPTION 0～1 1

22 C.KILL.OFF 0～1 0 46 GAME OPTION 0～1 1

23 SND.TRAP 0～1 0 47 SCREEN OPTION 0～1 1

4. Trouble shooting

9

Complete set power supply outline

4.1 No grating, no picture, no soundGeneral, these failures are produced by power sources, because of which refer to a wider area, so that can be divided them two conditions to explain: no +B 110 V and existing +B 110V.

(1) No +B (110V) voltage (voltage of network AC 90～260V )

These failures may be caused by power supply switch.

110VRectifying andDetection

H DrivePower Supply

27VRectifying andDetection

H.OUTPower Supply

PowerAmplifying

18/15VRectifying andDetection

15V N602 78L05Rectifying andDetection

CPUPower Supply

N603 7812

V.OUT Power supply

Check fuse F601 or 602

Check voltage on D pole of V613 (switching MOSFT) =200～310VCheck C607,

C603~C606, V613 at

condition ofshort-circuit?

Replace the parts of failure

Check 90～260V AC input and R602 VD603~VD606 rectifying, V613.

YN

YY

Y

Check voltage +B

=0V

14

12 T601

13

10

9

12

9

Check if any diodes of VD621～VD624 is short-circuit.

N

N605 7805

10

(2) Existing +B 110 VThese failures may be caused by abnormal operation of horizontal

scan, to confirm which can observe the filament of tube whether bright on. If determined horizontal scan in abnormal operation, look for the failure start from the horizontal drive stage. Search upward to LA76812 with method of checking DC voltage and waveform according to sequence: PIN27/H.OUT port PIN25 power supplyVD622 output.

4.2 Existing grating and no pictureBecause of the picture video signals and OSD characters display are input from PIN44, PIN15, PIN16, PIN17 of LA76812(N201), so to observe characters on screen of faulted TV can determine the approximate area of

Check if the voltage at pin25 of N201 is 5V?

Check if connected Components is

short-cut to GND?

Check filament circuit of FBT~CRT

Check horizontal output stage and deflection circuit

Check V501, T501and connected components.

NY

N

Y

Check VD622

YN

Check the resistor R503.

Check if the out waveform of Pin27 is correct?

Check if the BUS is connected correctly? Then check N201.

N

Check the CPU operating.

11

fault.

4.3 Existing grating, no picture and soundProcessing according “4.2 Existing grating and no picture” at first, let the picture display normally, then check sound. About the repair method, see “4.4 Existing grating and picture, no sound”.

4.4 Existing grating and picture, no sound (with BTSC function)

NY

Y NNY

Y N

NY

Display OSD characters on screen

When searching automatically channels, check CVBS waveform existed at N201/PIN44

Check 180 V power supply of relative plug-in

connector

Check CVBS waveform existed at N201/PIN44

Check circuit between PIN44~PIN46 of N201

Check CVBS waveform at N201/PIN19/PIN20/ PIN21

Check operating status of TUNER and connections

If the ABL circuit is OK, then check N201

Check CRT board

Check 180 V power supply on CRT board

Check bus between N101, N102, N201*

*：Whenever open or interconnect on the BUS from CPU to E2PROM and main chip N201, no picture can occur.

Check two pins of loudspeaker whether normal

Check loudspeaker

Check waveform output from N303

and N304

Check external element connected to N303 N304, specially supply power, volume control from CPU and input signal from N305 (TV/AV selecting)

Check the loudspeaker and its

connection

YN

Y

N

12

4.5 Cannot save channels

4.6 CPU non-operating

Y

Y

Y

N

N

N

When searching automatically channels, observe whether can display picture

Check BUS connected to N102

and N102

Check AFT voltage variation at

N101/PIN14

Check voltage variation at

N201/PIN46

Check the signal from IF to N201

pin5 and pin6

Check TUNER power supply 5V, 33V, RF AGC to N201 and BUS connection.

Check N201

Check voltage at N101/PIN12=5V

Y

Y

Check voltage at N101/PIN17 (RESET)=5V

Check 15V~CPU 5V Supply mainly R625 and connected components.

Check V102 and VD103 RESET

circuit

Manual RESET thanOK?

Y

N

N

Check the sound signal input pin2, pin12, output pin14, pin15 of N305

Check N307 signal input pin11, BUS, power supply and connections.

Note: Mono sound circuit is much easy for repairing referencing the block diagram.

13

5．The component that will be shattered listing

V501 2SC2383-O

V502 2SD1555/2SD1556/2SD2539

V613 2SC4236/2SC4237/ KA5Q1265RF

N201 LA76812/LA76814

N101 LC863232A-5V57

N102 AT24C04

N1101 HS0038A

N306 LA4225A / N303 N304 TDA7056AQ

N401 LA78040/LA7841/LA7845

N604 PC817

VD110 CW574CS

U101 STUF770（FS）/TEDH9-237A

T502 BSC24-33553-6P/ BSC25-3355-8/BSC29-3802-13R

T601 BCK-70-01C/BCK-180-408X

N602 N603 N605 KA7805/KA7812

T501 TX0040 /BCT-16

Speaker 5W-8Ω/5W-16Ω/10W-8Ω

Check the BUS connection

Check oscillating waveform at

N101/PIN10/PIN11

Check whether any functional keys of the TV

always be pressed

Check transistor oscillating outer

elements

Check N101

Y

N

N

N

Y

Check the voltage at N701/PIN13 is fixed

except 0V

14

15

6． Circuit Diagram

1 2 3 4

A

B

C

D

4321

D

C

B

A

7653412 10

8

SC

FO

HV

T502

C508

10¦ÌF

R504

1K¦¸

C509

0.056

R504A

680

+11

0V

L501

037*

1

R510

1K¦¸

C514

0.47

VD501

MTZJ8.2C

R508

10K¦¸

R509

10K¦¸

VD504

RGP10J

+1

87

V

12345678910

11

12

13

14

15

16

17

18

19

20

21

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

WO

OF

ER

VO

L

VO

LU

ME

-R

GN

D

XT

AL

1

XT

AL

2

H.S

YN

V.S

YN

CV

BS

-IN

FIL

T

RE

SE

T

NC

KE

Y2

AF

T IN

VD

D

KE

Y1

R.O

UT

G.O

UT

B.O

UT

OS

D B

LA

NK

SD

A0

SC

L0

EN

AB

LE

S-V

HS

NC

AV

2

AV

1

CO

MB

FIL

TE

R

IR-IN

NC

50

/60

AL

AR

M

VO

LU

ME

-L

PO

WE

R

DE

GA

US

S

NC

SD

A1

SC

L1

SR

S

WO

OF

ON

/OF

F

MU

TE

TV

/AV

V/M

UT

E

N101

LC8632325V57

R193

1K¦¸

X101

32KHzR108

390K¦¸

C104

15

C105

15C107

0.01

C106

470¦ÌF

L101

39¦ÌH

R109

10K¦¸

C108

0.1

C110

0.01

C111

0.033

R113

390K¦¸

V102

2SA1015

R112

8.2K¦¸

R111

1.5K¦¸

VD103

MTZJ3.6A

R115

100

R114

1M¦¸

C112

2.2¦ÌF

R117

10K¦¸

C103

100

R116

4.7K¦¸

V114

2SC1815R118

27K¦¸C138

100

C139

15

R165

100K¦¸

V103

2SC1815

R119

10K¦¸C113

0.01

R163

33K¦¸

SW102

P-

R156

9.1K¦¸

R155

4.7K¦¸

R154

3.3K¦¸

R153

2.2K¦¸

R152

1.2K¦¸

R157

22K¦¸

SW101

P+

SW103

VOL+

SW104

VOL-

SW106

AV

SW107

POWER

VD111

1N4148

R141

390

R160

330

VD112

RM11C

+1

2V

C128

220

R128

220

C129

220

R129

220

R126

1K¦¸

C117

100

C137

220

R127

1K¦¸

C116

100

R124

1K¦¸

R125

1K¦¸

C115

100

R122

1K¦¸

R123

1K¦¸

C114

100

R120

1K¦¸

R121

1K¦¸

VD104

1N4148

R142

100K¦¸

VD105

1N4148

V108

2SA1015

C123

100¦ÌF

VD108

1N4148

VD107

MTZJ5.6B

R135

1K

N103

HS0038

C368

22¦ÌF

R373

22K¦¸

R314

1K¦¸V302

2SC1815

R138

4.7K¦¸R137

4.7K¦¸C120

47¦ÌFC119

0.01

R139

100

R140

100

12345 6 7 8

N102

AT24C04

L611

LM-01

XS602

XP602XP601

XS601

F601

3.15A 250V

C601

0.22

R601

220K¦¸

L601

LF-003

P10X180M

PS601

t5

R602

3.9

C603~C606

1000

VD603-VD606

TVR4J

SW601

KA04

N603

KA7812

2R630

56

12

3

1

R761

0.47+1

2V

12

1000V

12

AC

27

5V

PNM P

VC C 1

INV IN

NON-INV IN

VC C 2

V OUT

GND

76

54

32

1

N401

LA7840

R406

1

C407

0.1

R407

330

R412

22K¦¸C414

1000¦ÌF

C408

3.3¦ÌF

R431

1.2K

R405

560

R403

10K¦¸

R411

18K¦¸

2

R404

2.2

R432

1.2K¦¸R402

3.3K¦¸

C403

1000

C406

1¦ÌF

C405

100¦ÌF

VD401

RGP10D

C404

1000¦ÌF

R410

4.7K¦¸

R409

4.7K¦¸

+5

V

FB503

LF-05

C632

470¦ÌF

16V

35V

35V

35V

100

V

PO

WER

GN

DH

OR

.GN

D

V.D

EF.O

UT

C512

2700

C511

7200

V502

D1555

FB502

LF-05

FB501

LF-05

T501

TX-0004

C507

47¦ÌF

C508

1000

2

R507

270

+2

7V

R506

1K¦¸

C506

3900

V501

2SC2383(D,R)

H.P

RE-D

RIV

E

500V

50

0V

35V

1.6

KV

2K

V

C519

0.1 R514

1K¦¸

63

V

INV

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TO

R

10V

MU

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25V

+1

5V

RES

ET

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14

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19

20

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23

24

25

26

27

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29

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31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

N201

LA76812

C201

0.022

C202

0.01

R202

33K¦¸

C206

1¦ÌF

C204

0.01

C205

100¦ÌF

L203

10¦ÌH

R205

100

C207

0.1

R204

100K¦¸

R203

100K¦¸

R206

100

C702

1¦ÌF

C703

1¦ÌF

C704

1¦ÌF

C705

1¦ÌF

VD706

1N4148

R703

100

VD704

1N4148

R702

100

VD703

1N4148

R701

100

VD702

1N4148

C706

0.01

C707

47¦ÌF

VD721

MTZJ7.5CR705

220

C719

100

R704

10K¦¸

C401

0.47

C402

0.22L502

LF-05

C501

0.01

C502

100¦ÌF

C505

0.015R502

5.6K¦¸

C504

1¦ÌF

R501

2K¦¸

R757

4.7K¦¸

R755

22K¦¸

R748

1.2K¦¸

C757

10¦ÌF

R749

1K¦¸

C755

1000

C750

0.047

C754

0.47R758

12K¦¸

R759

12K¦¸

R754

1K¦¸ C753

16

X701

3.58MHz

C752

2.2¦ÌF

R706

100R762

6.8K¦¸

R764

R708

100¦¸

R709

33

C707

100V701

2SC1815

C720

1¦ÌF

C715

100¦ÌF

+1

2V

C712

0.01C713

220¦ÌF C714

4.7¦ÌF

R713

560K¦¸

C210

0.47¦ÌF

R208

1K¦¸

V203

2SA1015

R216

330

R215

330

+1

2V

L204

VCO

C209

1¦ÌFR207

120

C303

8

C304

1000

C305

0.01

R331

3.3K¦¸

C812

10¦ÌF

16

V

63V

16V63

V6

3V

63V

25V

63V

BU

FFER

16V

100V

16

0V

H.L

IN.C

OIL

250V

C811

1¦ÌF

16

V

16V

C213

1¦ÌF

RGB

AU

DIO

OU

T

FM

OU

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PIF

AG

C

RF

AG

C O

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PIF

IN

PIF

IN

IF G

ND

VC

C(V

IF)

FM

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AF

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G IN

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C(R

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R U

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B IN

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