manual_de_servicio_14M2

8/7/2019 manual_de_servicio_14M2

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EPT-1409NF

EPT-2109NF

EPT-2119PF

SERVICE MANUAL

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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 )

Safety Instructions

1.1 X-ray Radiation Precaution

Excessive high voltage can produce potentially hazardous X-rayradiation. To avoid such hazards, the high voltage must not be above31.0KV(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 maxbeam current (maximum brightness) under a 90-260V, 50/60HZ AC

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power source.

1.2 Safety Precaution

WARNING:

Service should not be attempted by anyone unfamiliar with the necessaryprecautions on this television. The followings are the necessaryprecautions 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 duringany 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 theprotective devices are put back in place, such as non-metallic controlknobs, 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 asterminals, screws, metal overlays control shafts, etc., to insure that the setis safe to operate without danger of electrical shock.

1.3 Product Safety Notice

Many electrical parts in this chassis have special safety-relatedcharacteristics. These characteristics are often passed unnoticed by avisual inspection and the protection afforded by them cannot necessarilybe obtained by using replacement, rated for higher voltage, wattage, etc.

Replacement parts with special safety characteristics must be identified inthis manual and its parts list. Before replacing any of these components,read the parts list in this manual carefully. The use of substitutereplacement parts that do not have the same safety characteristics asspecified in the parts list may create shock, fire, X-ray radiation of other hazards.

1.4 Automatic Degaussing

A 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

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operates for about 1 second after the power is switched ON. If the set ismoved or turned in a different direction, the power should be OFF for atleast 15 minutes. If the chassis or parts of the cabinet becomemagnetized, 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 adistance of about 6 feet before turning power OFF.

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1. 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:

The block diagram with BTSC function 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 IN

SDA

SCL

TV audio

AUDIO OUT Select VideoV OUT FBP H OUT R/G/B

SDA1 SCL1Video

N101 CPU

LA863232AR/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

SDA1 SCL1Video

N101 CPU

LA863232AR/G/B OUT

Volume-R SDA0Volume-L SCL0

AV1/AV2TV./AV

H V

FS TUNER

SAWFilter

A1-L

Video1

A1-R Select video

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

3. MENU TECNICO

IF IN

RF AGC Ext VIDEO IN

N201

LA76812

R/G/B IN

SDA

SCL

Select Video

TV AudioV OUT FBP H OUT R/G/B

CRT PCB

H IN

H OUT

V IN N401

LA78040

DY

POWER

UNIT 12V

15V

27V

8V

N801 4053A-LA-R

Video2

AV1/AV2

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 TDA7056B

L

R

110V

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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 volumenmenos(V-) en el TV al mismo tiempo”.Aparecera en la pantalla delTV la palabra FACTORY, indicando que se encuentra en modo deservicio.

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

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

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

NORMAL TV FACTORY B/W Balance

SETUP ADJUST

3.1.2 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" paraincrementar "R-BIA". Presionando "4" para decrecer "G-BIA";presionando "5" para incrementar "G-BIA". Presionando "6" paradecrecer "B-BIA"; press "7" para incrementar "B-BIA".

b. B/W Balance Adjusts

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

B/W ADJUST

B/W Balance

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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 itemsin 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/TVopcion, OSD opcion, power ON/OFF opcion etc. , presione CH+ o CH-para selecionar los item de la Tabla del " SETUP " ,presionando VOL+ oVOL- para seleccionar los ajustes .

Items Dis la Bus Data Ran e1 S-BRI Sub-Brightness 0~127

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

3 B-DRV B-Driver 0~1274 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

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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

05SUB TINT

0～63 31 29 POWER FLAG 0～1 0

06BLK.STR.OEF

0～3 0 30 SEARCH CHECK 0～1 0

07AFC GAIN

0～1 1 31SEARCH 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

13B.GAM.SEL

0～15 3 37 WOOF/H.PHONE 0～1 0

14RG.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

21R-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

Power Amplifying

18/15VRectifying andDetection

14

12T601

13

10

9

12

9

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Complete set power supply outline

4.1 No grating, no picture, no soundGeneral, these failures are produced by power sources, because of whichrefer to a wider area, so that can be divided them two conditions toexplain: 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

15V N602 78L05Rectifying andDetection

CPUPower Supply

N603 7812

V.OUTPower supply

Check fuse F601 or 602

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

C603~C606,V613 at

condition of short-circuit?

Replace the parts of failure

Check 90～260V AC inputand R602 VD603~VD606rectifying, V613.

YN

Y

Y

Check voltage +B

=0V

Check if anydiodes of VD621～VD624 is short-circuit.

N

N605 7805

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(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 brighton. If determined horizontal scan in abnormal operation, look for the

failure start from the horizontal drive stage. Search upward to LA76812with method of checking DC voltage and waveform according tosequence: PIN27/H.OUT port→PIN25 power supply→VD622 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 observecharacters on screen of faulted TV can determine the approximate area of

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

Check if connectedComponents is

short-cut to GND?

Check filament circuitof FBT~CRT

Check horizontaloutput stage anddeflection circuit

Check V501, T501and connectedcomponents.

NY

N

Y

Check VD622

YN

Check the resistor R503.

Check if the out waveform of Pin27 is correct?

Check if the BUS isconnected correctly?Then check N201.

N

Check the CPU operating.

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fault.

4.3 Existing grating, no picture and soundProcessing according “4.2 Existing grating and no picture” at first, let thepicture 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 waveformexisted at N201/PIN44

Check circuit betweenPIN44~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 onCRT board

Check bus betweenN101, N102, N201*

*：Whenever open or interconnect

on the BUS from CPU to E2PROMand main chip N201, no picture canoccur.

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 itsconnection

YN

Y

N

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

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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 BUSconnection

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

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