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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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