-
EPT-1409NF
EPT-2109NF
EPT-2119PF
SERVICE MANUAL
1
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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-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
2
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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 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
3
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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
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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 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
SDA1 SCL1 Video
N101 CPU LA863232A R/G/B OUT
Volume-R SDA0Volume-L SCL0
AV1/AV2TV./AV
H V
FS TUNER
SAWFilter
A1-L
Video1
A1-R Select video
5
-
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 INSDASCL
Select Video
TV Audio V 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
6
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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
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 posicin 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 ModeDespus 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 AdjustsDespus 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
B/W Balance
7
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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
items in the " ADJUST " Table, press VOL+ or VOL- to adjust
selected item. ADJUST
Item Range Preset Note Item Range Preset Note00 H.PHASE 031 11
11 NT.V.SC 031 -02
01 NT.H.PHASE 031 2 12 RF.AGC 063 20
02 H.BLK.LEFT 07 7 13 VOL.OUT 0127 100
03 H.BLK.RIGHT 07 7 14 OSD H.POSI 063 25
04 V.SIVE 0127 73 15 OSD V.POSI 063 13
05 V.LINE 031 12 16 INPUT LEVEL 015 08
06 V.POSI 063 22 17 SPECTRAL 063 26
07 V.SC 031 6 18 WIDEBAND 063 25
08 NT.V.SIVE -3131 -02 19 STEREOVCO 063 1
08 NT.V.LINE -3131 -02 20 SAP.VCO 063 51
10 NT.V.POSI 063 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 0~1272 C-B/W
C-B/W 0~33 B-DRV B-Driver 0~1274 G-DRV G-Driver 0~155 R-DRV
R-Driver 0~1276 B-BIA B-Bias 0~2547 G-BIA G-Bias 0~2548 R-BIA
R-Bias 0~254
ADJUSTITEM .00H.PASE 8
SETUPITEM .06BLK.STR.DEF 0
8
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SETUP ITEM RANGE PERSET NOTE ITEM RANGE PERSET NOTE
00 LA76814/LA76812 01 1 24 VOL.FIL.OFF 01 0
01 SAP IC SELECT 01 1 25 VIF.SYS.SW 03 1
02 SUB CONT 031 31 26 VIDEO.LEVEL 015 7
03 SUB CORLOR 063 25 27 FM.LEVEL 031 25
04 SUB SHARP 063 31 28 POWER OPTION 03 0
05 SUB TINT 063 31 29 POWER FLAG 01 0
06 BLK.STR.OEF 03 0 30 SEARCH CHECK 01 0
07 AFC GAIN 01 1 31 SEARCH SPEED 01 1
08 V. SETUP 01 1 32 AV.OPTION 03 2
09 CD.MODE 07 0 33 POSION L/R 01 1
10 DIGITAL OSD 01 0 34 BLUE.BACK 01 1
11 OSD CONT 0127 55 35 BLACK.BACK 01 1
12 GRAY MOD 015 1 36 STEREO OPTION 01 1
13 B.GAM.SEL 015 3 37 WOOF/H.PHONE 01 0
14 RG.GAM.DEF 015 1 38 WOOF VOL.OPT 01 1
15 FBDBLK.SW 015 1 39 SENSITIVITY 01 0
16 BRIGHT.ABL.TH 01 6 40 V.MUTE P.OFF 01 0
17 EMG.ABL.DEF 015 1 41 CCD OPTION 01 1
18 BRIGHT.ABL.DEF 015 1 42 V-CHIP OPTION 01 1
19 MID.STP.DEF 03 1 43 PASS WORD.DPT 01 1
20 R-Y/B-Y G.BL 015 15 44 COMB.OPTION 01 0
21 R-Y/B-Y. ANG 015 15 45 TUNER OPTION 01 1
22 C.KILL.OFF 01 0 46 GAME OPTION 01 1
23 SND.TRAP 01 0 47 SCREEN OPTION 01 1
4. Trouble shooting
PowerAmplifying
18/15VRectifying andDetection
14
12 T601
13
10
9
12
9
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 90260V )
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.OUT Power supply
Check fuse F601 or 602
Check voltage on D pole of V613 (switching MOSFT) =200310VCheck
C607,
C603~C606, V613 at
condition ofshort-circuit?
Replace the parts of failure
Check 90260V AC input and R602 VD603~VD606 rectifying, V613.
YN
YY
Y
Check voltage +B
=0V
Check if any diodes of VD621VD624 is short-circuit.
N
N605 7805
10
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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
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
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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
Check the sound signal input pin2, pin12, output pin14, pin15 of
N305
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 N307 signal input pin11, BUS, power supply and
connections.
Note: Mono sound circuit is much easy for repairing referencing
the block diagram.
13
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5The component that will be shattered listingV501 2SC2383-OV502
2SD1555/2SD1556/2SD2539V613 2SC4236/2SC4237/ KA5Q1265RFN201
LA76812/LA76814 N101 LC863232A-5V57N102 AT24C04N1101 HS0038AN306
LA4225A / N303 N304 TDA7056AQN401 LA78040/LA7841/LA7845N604
PC817VD110 CW574CSU101 STUF770FS/TEDH9-237AT502 BSC24-33553-6P/
BSC25-3355-8/BSC29-3802-13RT601 BCK-70-01C/BCK-180-408XN602 N603
N605 KA7805/KA7812T501 TX0040 /BCT-16 Speaker 5W-8/5W-16/10W-8
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
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6 Circuit Diagram
1 2 3 4
A
B
C
D
4321
D
C
B
A
7653412 108
SC FO HV
T502
C508
10F
R504
1KC509
0.056
R504A
680
+110V
L501
037*
1 R510
1K
C514
0.47
VD501
MTZJ8.2C
R508
10K
R509
10K
VD504
RGP10J
+187V
123456789101112131415161718192021
424140393837363534333231302928272625242322
WO
OFE
R V
OL
VO
LU
ME
-R
GN
D
XT
AL
1
XT
AL
2
H.SY
N
V.SY
N
CV
BS-IN
FILT
RE
SET
NC
KE
Y2
AFT
IN
VD
D
KE
Y1
R.O
UT
G.O
UT
B.O
UT
OSD
BL
AN
K
SDA
0
SCL
0
EN
AB
LE
S-VH
S
NC
AV
2
AV
1
CO
MB
FILT
ER
IR-IN
NC
50/60
AL
AR
M
VO
LU
ME
-L
POW
ER
DE
GA
USS
NC
SDA
1
SCL
1
SRS
WO
OF O
N/O
FF
MU
TE
TV
/AV
V/M
UT
E
N101
LC8632325V57
R193
1K
X101
32KHzR108
390K
C104
15
C105
15C107
0.01
C106
470F
L101
39H
R109
10K
C108
0.1C110
0.01
C111
0.033
R113
390K
V102
2SA1015
R112
8.2K
R111
1.5K
VD103
MTZJ3.6A
R115
100
R114
1MC112
2.2F
R117
10K
C103
100
R116
4.7K
V114
2SC1815R118
27KC138
100
C139
15
R165
100K
V103
2SC1815
R119
10KC113
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
+12V
C128
220
R128
220
C129
220R129
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
2SA1015C123
100F
VD108
1N4148
VD107
MTZJ5.6B
R135
1K
N103
HS0038
C368
22F
R373
22K
R314
1KV302
2SC1815
R138
4.7KR137
4.7K C120
47FC119
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 R6023.9
C603~C606
1000
VD603-VD606
TVR4J
SW601
KA04
N603
KA7812
2 R630
56
12
3
1
R761
0.47+12V
12
1000V
12
AC
275V
PNMP
VCC1
INV IN
NON-INV IN
VCC2
V OUT
GND
76
54
32
1
N401
LA7840
R406
1
C407
0.1
R407
330
R412
22KC414
1000F
C408
3.3F
R431
1.2K
R405
560
R403
10K
R411
18K
2
R404
2.2
R432
1.2KR402
3.3K
C403
1000
C406
1F
C405
100F
VD401
RGP10D
C404
1000F
R410
4.7K
R409
4.7K
+5V
FB503
LF-05
C632
470F16V
35V
35V
35V
100V
PO
WE
R G
ND
HO
R.G
ND
V.D
EF
.OU
T
C512
2700
C511
7200
V502
D1555
FB502
LF-05
FB501
LF-05
T501
TX-0004
C507
47F
C508
1000
2 R507
270+27V
R506
1K
C506
3900
V501
2SC2383(D,R)
H.P
RE
-DR
IVE
500V500V
35V
1.6KV
2KV
C519
0.1 R514
1K
63V
INV
ER
TO
R
10V
MU
TE
25V
+15V
RE
SE
T
12345678910111213141516171819202122232425262728 29 30 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
0.01R202
33K
C206
1F
C204
0.01
C205
100F
L203
10H
R205
100
C207
0.1
R204
100K
R203
100K
R206
100C702
1F
C703
1F
C704
1F
C705
1F
VD706
1N4148
R703
100
VD704
1N4148
R702
100
VD703
1N4148
R701
100
VD702
1N4148
C706
0.01
C707
47F
VD721
MTZJ7.5CR705
220
C719
100
R704
10K
C401
0.47
C402
0.22L502
LF-05
C501
0.01
C502
100F
C505
0.015R502
5.6K
C504
1F
R501
2K
R757
4.7K
R755
22K
R748
1.2K
C757
10F
R749
1K
C755
1000C750
0.047C754
0.47R758
12K
R759
12K
R754
1K C753
16
X701
3.58MHz
C752
2.2F
R706
100R762
6.8K
R764
R708
100
R709
33
C707
100V701
2SC1815C720
1F
C715
100F
+12V
C712
0.01C713
220F C714
4.7F
R713
560K
C210
0.47F
R208
1K
V203
2SA1015
R216
330
R215
330
+12V
L204
VCO
C209
1FR207
120
C303
8
C304
1000C305
0.01R331
3.3K
C812
10F
16V
63V
16V63V63V63V
25V
63V
BU
FF
ER
16V
100V
160V
H.L
IN.C
OIL
250V
C811
1F
16V
16V
C213
1F
RGB
AU
DIO
OU
T
FM O
UT
PIF AG
C
RF A
GC
OU
T
PIF IN
PIF IN
IF GN
D
VC
C(V
IF)
FM FIL
AFT
OU
T
BU
S DA
TA
BU
S CL
OC
K
AB
L
R IN
G IN
B IN
BL
IN
VC
C(R
GB
)
R U
OT
G O
UT
B O
UT
AK
B IN
V O
UT
RA
MP A
LC
FIL
VC
C(H
/D)
H A
PC FIL
H.O
UT
FBP IN
VC
D IR
EF
CL
OC
K O
UT
HD
L V
CC
CC
D FIL
GN
D(C
CD
/H)
X-R
AY
XIA
L
DD
S
AC
C FIL
TE
R
XIA
L
CH
RO
MA
APC
SEL
EC
T V
.OU
T
GN
D(V
/C/D
)
EX
T V
.IN
VC
C(V
/C/D
)
INT
V.IN
BL
AC
K ST
RE
TC
H FIL
VID
EO
OU
T
VC
O
VC
O C
OIL
VC
O C
OIL
PIF APC
EX
T A
UD
IO IN
SIF OU
T
SND
APC
FIL
SIF IN
C318
0.01
C317
1000F
C319
0.01
C330
1F
+17V
CRT
R912
1.8K
R922
1.8K
R902
1.8K
2
R901
15K
2
R921
15K
2
R911
15K
R905
330C904
560
XP701
C903
100C913
100C923
100
C931
22F
R925
330C924
560R915
330C914
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R-DRVR-DriverG-Bias EPT-1409NFEPT-2109NFEPT-2119PF Contents1.
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 Instructions1.1 X-ray Radiation
Precaution 1.2 Safety Precaution SETUP ADJUSTSETUP
