EPT-1409NF
EPT-2109NF
EPT-2119PF
SERVICE MANUAL
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 )
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 Precaution
WARNING:
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 Notice
Many 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 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 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 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.
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:
Nota: si no puede entrar con recall intentelo con disply o mute.
3. MENU TECNICO
3.1 PRUEBA DE AJUSTE
3.1.1 METODO DE ACCESO AL MODO DE SERVICIO
Usando el control remoto realize los siguientes pasos:
- 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.
- 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
- Para los ajustes de color, vertical, vuelva apresionar RECALL en el control remoto y volumen menos en el TV al mismo tiempo
- 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 ADJUST
3.1.2 MODO DE AJUSTE DEL BLANCO BALANCE B/W.
- Line Mode
Después 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 Adjusts
Después 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 ADJUST
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
/ 0~1276 / B-BIA / B-Bias / 0~254
7 / G-BIA /
G-Bias
/ 0~2548 / R-BIA / R-Bias / 0~254
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 / Note00 / 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 Mode
En 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 .
SETUP
ITEM / RANGE / PERSET / NOTE / ITEM / RANGE / PERSET / NOTE00 / 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
Complete set power supply outline
4.1 No grating, no picture, no sound
General, 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.
(2) Existing +B 110 V
These 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 picture
Because 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 fault.
4.3 Existing grating, no picture and sound
Processing 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)
4.5 Cannot save channels
4.6 CPU non-operating
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
6．Circuit Diagram
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