Post on 30-Mar-2015
description
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 )
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
2
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
3
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 IN SDA SCL
TV audio
AUDIO OUT Select Video V OUT FBP H OUT R/G/B
SDA1 SCL1 Video
N101 CPU
LA863232A R/G/B OUT
SDA0 SCL0
AV1/AV2 TV./AV
H V
FS TUNER
Video1 SAW
Filter
CRT PCB
Audio1
N801
4053
Video2
Audio2 AV1/AV2
A-outN305
4053
TV/AV
H IN
H OUT V IN N401
LA78040
DY
Select video
12V
17V
27V
POWER
UNIT 8V
N601
LA4225A
5
The block diagram with BTSC function is shown as follows:
IF IN
RF AGC Ext VIDEO IN
N201 LA76812 R/G/B IN SDA SCL
Select Video
TV Audio V OUT FBP H OUT R/G/B
SDA1 SCL1 Video
N101 CPU
LA863232A R/G/B OUT
Volume-R SDA0 Volume-L SCL0
AV1/AV2 TV./AV
H V
FS TUNER
SAW
Filter
CRT PCB
A1-L
Video1
H IN
H OUT V IN N401
LA78040
DY
POWER
UNIT 12V
15V
27V
8V
N801
4053 A-L
A-R A1-R
Video2
AV1/AV2
Select video
A2-L
N305
4053
A-L
A-R
TV/AV
110V
SCREEN/ FOCUS
CRT
HV
A2-R
V-out
L-out
R-out
N307 CXA2104S ---------
TV-L TV-R
N304 TDA7056B
N304 TDA7056B
L
R
6
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:
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 ADJUST 3.1.2 MODO DE AJUSTE DEL BLANCO BALANCE B/W.
B/W Balance
a. 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
7
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 0~127 6 B-BIA B-Bias 0~254 7 G-BIA G-Bias 0~254 8 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
ADJUST ITEM .00 H.PASE 8
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
8
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 .06 BLK.STR.DEF 0
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
9
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.
110VRectifying and Detection
H DrivePower Supply
27VRectifying and Detection
H.OUTPower Supply
18/15V Rectifying and PowerAmplifying Detection 14
15V N602 78L05Rectifying and Detection
CPUPower Supply
N603 7812
V.OUT Power supply
Check fuse F601 or 602
Check voltage on D pole of V613 (switching MOSFT) =200~310V Check C607,
C603~C606,
V613 at
condition of
short-circuit? Check 90~260V AC input
and R602 VD603~VD606
rectifying, V613.
Y N
Y
Y
Check voltage +B
=0V
12 T601
13
10
9
12
9 N605 7805
Check if any
diodes of VD621~
VD624 is
N
10
Replace the parts of
failure
11
(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 supply→VD622 output. Check if the voltage at pin25 of
N201 is 5V?
Check if connected N
Check if the out waveform of
Pin27 is correct?
Check the resistor
R503.
N Y
Check filament circuit of FBT~CRT
Check horizontal output stage and deflection circuit
Check V501, T501 and connected components.
N
Check VD622
Y N
Check the CPU operating.
Then check N201.
Check if the BUS is
connected correctly?
Components is short-cut to GND?
Y
12
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.
N Y
Y N N Y
Y N
N Y
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 bus between
N101, N102, N201*
Check 180 V power supply on CRT board
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
*:Whenever open or interconnect on
the BUS from CPU to E2PROM and
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”.
13
4.4 Existing grating and picture, no sound (with BTSC function)
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
Y N
Y
Check N307 signal input pin11,
BUS, power supply and connections.
Check the sound signal input pin2,
pin12, output pin14, pin15 of N305
Note: Mono sound circuit is much easy for repairing referencing the block diagram.
N
4.5 Cannot save channels
N
When searching automatically channels, observe whether can display picture
Y
Y N
N
Check voltage variation at
N201/PIN46
Check N201
Check the signal from IF to N201
pin5 and pin6
Check TUNER power supply
5V, 33V, RF AGC to N201
and BUS connection.
Check AFT voltage variation at
N101/PIN14
Y Check BUS
connected to N102 and N102
14
4.6 CPU non-operating
Check voltage at N101/PIN12=5V
Y
Check voltage at N101/PIN17 (RESET)=5V
N
OK? Manual RESET than Check V102 and
VD103 RESET circuit
Y
N
Check 15V~CPU 5V
Supply mainly R625 and
connected components.
Y
N
Check the BUS
connection
Y
Y
Check the voltage at N701/PIN13 is fixed
except 0V
N Check transistor oscillating outer
elements
Check oscillating waveform at
N101/PIN10/PIN11
N
Check whether any functional keys of the TV
always be pressed
Check N101
15
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
16
6. Circuit Diagram
1 2 3 4
A
B
C
D
4321
D
C
B
A
7653412 108
SC FO HV
T502
C508
10¦ÌF
R504
1K¦̧C509
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
OFER V
OL
VO
LUM
E-R
GN
D
XTA
L1
XTA
L2
H.SY
N
V.SY
N
CVBS-IN
FILT
RESET
NC
KEY
2
AFT IN
VD
D
KEY
1
R.OU
T
G.O
UT
B.OU
T
OSD
BLAN
K
SDA
0
SCL0
ENA
BLE
S-VH
S NC
AV
2
AV
1
COM
B FILTER
IR-IN
NC
50/60
ALA
RM
VO
LUM
E-L
POW
ER
DEG
AU
SS
NC
SDA
1
SCL1
SRS
WO
OF O
N/O
FF
MU
TE
TV/A
V
V/M
UTE
N101
LC8632325V57
R193
1K¦̧
X101
32KHzR108
390K¦̧
C104
15
C105
15C107
0.01
C106
470¦ÌF
L101
39¦ÌH
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
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
+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
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
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
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¦̧
+5V
FB503
LF-05
C632
470¦ÌF
16V
35V
35V
35V
100V
POW
ER 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
47¦ÌF
C508
1000
2 R507
270+27V
R506
1K¦̧
C506
3900
V501
2SC2383(D,R)
H.PR
E-DR
IVE
500V500V35V
1.6KV
2KV
C519
0.1 R514
1K¦̧
63V
INV
ERTO
R
10V
MU
TE
25V
+15V
RESET
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
1¦ÌF
C204
0.01
C205
100¦ÌF
L203
10¦ÌH
R205
100
C207
0.1
R204
100K¦̧
R203
100K¦̧
R206
100C702
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
1000C750
0.047C754
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
2SC1815C720
1¦ÌF
C715
100¦ÌF
+12V
C712
0.01C713
220¦ÌF C714
4.7¦ÌF
R713
560K¦̧
C210
0.47¦ÌF
R208
1K¦̧
V203
2SA1015
R216
330
R215
330
+12V
L204
VCO
C209
1¦ÌFR207
120
C303
8
C304
1000C305
0.01R331
3.3K¦̧
C812
10¦ÌF
16V
63V
16V63V63V63V
25V
63V
BUFFER
16V
100V
160V
H.LIN
.CO
IL
250V
C811
1¦ÌF
16V
16V
C213
1¦ÌF
RGB
AU
DIO
OU
T
FM O
UT
PIF AG
C
RF AG
C OU
T
PIF IN
PIF IN
IF GN
D
VCC(V
IF)
FM FIL
AFT O
UT
BUS D
ATA
BUS CLO
CK
ABL
R IN
G IN
B IN
BL IN
VCC(RG
B)
R UO
T
G O
UT
B OU
T
AK
B IN
V O
UT
RAM
P ALC FIL
VCC(H
/D)
H A
PC FIL
H.O
UT
FBP IN
VCD
IREF
CLOCK
OU
T
HD
L VCC
CCD FIL
GN
D(CCD
/H)
X-RA
Y
XIA
L
DD
S
ACC FILTER
XIA
L
CHRO
MA
APC
SELECT V.O
UT
GN
D(V
/C/D)
EXT V
.IN
VCC(V
/C/D)
INT V
.IN
BLACK
STRETCH FIL
VID
EO O
UT
VCO
VCO
COIL
VCO
COIL
PIF APC
EXT A
UD
IO IN
SIF OU
T
SND
APC FIL
SIF IN
C318
0.01
C317
1000¦ÌF
C319
0.01
C330
1¦ÌF
+17V
CRT
R912
1.8K¦̧
R922
1.8K¦̧
R902
1.8K¦̧
2
R901
15K¦̧
2
R921
15K¦̧
2
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