COLOUR TELEVISION
SERVICE MANUAL
Models
21F8A
(Thailand)
Features
IC
2
BUS CONTROL
Child lock
Auto search 218 program presetting and memory
ON-TIME,OFF-TIME,APPOINTING PROGRAMME
REAR AUDIO/VIDEO INPUT
Serial Number: M-MR-AE-21F8A-8829B Version:00.00
Edition: 2006-3-21
COLOR TELEVISION Model: 21F8A
No.0001
1
2
3
A103
HS0038
A0
1
A1
2
A2
3
VSS
4
SDA
5
SCL
6
TEST
7
VCC
8
N202
NM24C08EN
1
3
2
N204
7805
R115
1.5K
R107
220
R108
3.9K
R113
33
V101
2SC2216
L103
1uH
C112
0.01
N121
upc574J
C111
0.1u
C110
4.7u
R553
2W12K
SW706
MENU
SW705
TV/VIDEO
SW704
VOL -
SW703
VOL +
SW702
CH -
SW701
CH +
R771
11K
R770
5.6K
BL301
R-10W8
G201
8M
L-IN / MONO
V-OUT
Y
C
XS801
C807
0.01u
R800
100
C801
1u
R805
4.7K
C802
10u
R806
75
R247
330
R248
10K
R203
330
R205
10K
R201
1K
R202
33K
R208
680
R213
8.2K
C213
1u
C214
1u
C215
1u
R214
100
R215
100
R216
100
C210
0.47u
C211
1000u
C212
0.01u
L202
47u
C216
0.47u
C217
10u
C218
0.01u
C221
10u
VD401
1SS133
C460
M0.1u
R473
100K
C461
0.1u
C223
100u
C224
0.01u
L203
15uH
C225
0.01u
C229
10u
C230 0.47u
C231
1000P
C233
470u
C232
0.01u
L206
PL-12uH
C236
4.7u
C237
0.022u
R227 150
C238
1u
T101
L18
R104
C239
100u
C240
0.01u
C241
1u
R231 220K
R232
33K
C253
0.22u
C242 M2200P
R233
270
R234
270
R235
270
VD206
HZ10
VD205
HZ10
VD204
HZ10
C246
0.01u
C245
47u
R238
47
C248
0.01u
C247
10u
R237
10K
R236
10K
C113
0.01u
C114
0.01u
R262
680
R263
560K
C261
1u
R265
68K
C262
180P
V209
A1015Y
R264
open
R267
12K
C264
1500P
R268
3.9K
R269
3.9K
C265
2700P
V210
C1815Y
R266
470
C263
33u
R244
22K
R243
10K
C251
27P
R204
10k
R249
100
C203
0.01u
C206
0.01u
C207
47u
L201
10u
L204
8.2uH
X201
X5.74M
R224
100
V202
A1015Y
R225
100
R226
100
R223
100
C102
220u
R120
15K
R101
56k
C101
4.7u
L207
15u
C244
0.01u
C243
100u
VD603
1SS133
R219
270 0.5W
C804
470u
R810
75
R828
1K
V801
A1015Y
C806
10u
R815
1K
R816
2.2K
V803
C1815Y
R818
100
R802
100
Y
Cb
Cr
R807
75
R808
75
R217
00
C209
0.47u
C208
8200P
C204
CH20p
C205
CH20p
R211
1.5K
VD201
HZ3.6V
R210
8.2K
V201
A1015Y
R209
4.7K
R212
10K
C201
0.01u
R245
1K
R251
10K
R252
10K
OFF
ON
C235
0.01u
C234
100u
L104
PL-15uH
R260
100
V208
A1015Y
R261
2.2K
VD602
1SS133
XS802
R222
3.3K
R221
3.3K
C-IN
C452
500V2200p
VD436
HZ6.2B
AGC
1
2
SCL
4
SDA
5
MB(+9V)
6
8
AS
3
BP(+5V)
7
BT(+33V)
9
IF
11
10
A101
TUNER-FS
R106
220
BL302
R-10W8
L-OUT / MONO
C805
10u
R812
1K
R813
2.2K
V802
C1815Y
R817
100
R803
4.7K
C803
10u
R814
22K
R811
22K
R
L
R-OUT
L-OUT
1
2
3
4
XS601
V204
C1815Y
R228
100
R229
2.2K
V-IN
C103
0.01u
C252
100P
C202
100P
R801
75
R110
5.6K
JUMP6
(OPEN)
R206
1K
+130V
B1
R.G.B out
SYNC.
R-OUT
R-IN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
N802
CD4053
C809
1u
C810
1u
V805
C1815Y
R827
1K
R830
10K
R823
100
R824
100
R207
10K
VD723
LED1
C605
0.47u
C606
0.47u
V602
C2878A
V603
C2878A
R611
22K
R610
22K
R604
1K
R603
1K
C604
0.01
C603
0.01
C630
470u/25V
C631
0.01u
B9
+15V
VC1
1
NC
2
Vin1
3
VP
4
Vin2
5
SGND
6
VC2
7
OUT2+
8
PGND2
9
OUT2-
10
OUT1-
11
PGND1
12
OUT1+
13
N601 TDA7057AQ
C608
1u
C610
1u
R606
22K
R608
22K
R605
10K
R607
10K
C607
4.7u
C609
4.7u
R239
1K
C249
100P
R240
10K
C250
100P
R241
1K
R242
10K
SPOT KILLER
L
R
R820
22K
R822
22K
R826
22K
R825
22K
R601 1K
R602
1K
C601 1u
C602 1u
KEY
1
LAMP
64
SIF
2
RMT-IN
63
AV
3
TV SYNC
62
GND
4
POWER
61
RESET
5
VOL2
60
X-TAL
6
VOL1
59
X-TAL
7
SCL1
58
TEST
8
SDA1
57
+5V
9
MUTE
56
GND
10
5V
55
YC GND
11
GND
54
SCP-OUT
12
RGB GND
53
H-OUT
13
B-OUT
52
H.AFC
14
G-OUT
51
V-SAW
15
R-OUT
50
V-OUT
16
RGB 9V
49
H-VCC
17
IK-IN
48
FS input
18
APC FIL
47
Cb
19
BLACK DET
46
Y-IN
20
SVM out
45
Cr
21
YC 5V
44
TV DIG GND
22
RF AGC
43
C-IN
23
IF IN
42
EXT-IN
24
IF IN
41
DIGI 3.3V
25
IF GND
40
CW-OUT
26
IF AGC
39
ABCL-IN
27
Audio out
38
EW out
28
S-REG
37
IF-VCC(9V)
29
IF-VCC(5V)
36
TV-OUT
30
PIF PLL
35
SIF-OUT
31
DC NF
34
EHT in
32
M COM/SIF-IN
33
N201
TMPA8829B
C425
0.022u
R457
100K
R458
150K
R440
100
R455
820K
R456 1 M
VD423
1SS133
JUMP1
(SHORT)
R255
100
R609
10K
C611
1000P
R819
22K
R821
22K
V203
C1815Y
R256
220
VIDEO
TV
RB02
18K
RB03
18K
RB01
5K6
VB02
C2878
VB01
C2878
DB01
HZ5V6
DB02
HZ6V2
DB03
HZ6V2
+12
SCL IN SDA I/O
SCL OUT
SDA O/I
NTSC
PAL
C811
1u
V205
A1015Y
V206
A1015Y
R258
1K
R259
1K
X202
X5.5M
R257
100
R413
150
V405
2SC2383-O
R451
3.3K
R421
2W4.7
R415
1W2K7
C417
820P/500V
C413
390P/500V
T401
BCT-11
C416
47u/35V
C421
10u100V
L421
L601K
V404
2SD1879
C440
OPEN
C444
0.01u1.6KV
C441
0.43u630V
HEAT
+200V
+200V
L441 AC41
R425
1W 1K
!
V423
D2493P
V440
2SA1015Y
R448
3.3K
R449
560
V436
A1015Y
R443
560
R446
56K
VD444
RU4D
VD461
RU4AM
C467
0.033u
R416
2W 270
R411
560
VD499 EU2A
C499
390P 500V
1
2
3
4
XS902
C431
0.056u200V
C901
22u250V
1
2
3
4
L410 LHDY
1
2
3
5
4
XS401
V437
2SA1015Y
R444
560
R590
5W 3.9
C448
33u160V
C304
2700P
VD301
EU2A
R307
33K
R306
33K
C305
2.2u
C320
1000u35V
R305
1W 1
C306
2200u25V
R313 4.3K
R462
1W12K
R441
560
VD422
1SS133
R450
10K
R447
1K
C308
220u50V
VD303
SC570A
R336
2W180
C314
0.15u 100V
R301
4.7K
R316
3.9K
R317
4.7K
C443
6800P 1.6KV
+5V-2
R406
10K
R405
20K
ABL
R453
100K
R454
18K
C451
0.015u
C313
0.22u100V
R303
0.5W1R5
VD421
1S1887FA
R442
1K
R445
1K
C321
10P/500V
6
5
3
4
1
2
10
7
KSC
KFC
HV
T402
FBT29
V555
2SC1815Y
XP502
SW501
KDC-A10
C501
0.22u/250VAC
L502
LF-U16-001
C502
0.22u/250V
1
23
RT501
MZ73-7
C503~C506
1KV 1000P
L503
LF-U16-001
VD501~VD504
RM11C
C507
220u/400V
C531
AC400V2200p
VD551
RU4AM
C551
1KV470p
C553
1KV471
VD553
RU3A
VD555
RU4Y
C555
500V390p
C565
1000u/25V
C561
220u/160V
R525
56K/2W
R501
0.5W220K
F501
4A/250V
R502
7W 1.5
R571
2W0.68
2
1
7
3 13
12
9
14
15
16
11
10
T501 42EC-X13V117-I
R561
0.5W3.3K
C563
330u/35V
VD554
EU2A
C554
1KV471
C564
1000u/25V
R566
1W1
R547
52.6K 0.5W
R548
JUMP
R549
1K 1/4W
R551
1K
+130V
B1
B3
+27V
VD515
PC817B
R564
1W 1
!
!
!
!
XP500
*
1
XS500
1
C517
100u/35V
R523
0.22
R521
680
R519
2.2K
L504
LZ2
VD516
AK03
C515
1000P
VD517
AUO1Z
C516
470P
C513
1000P/2KV
R516
10
R511 33K
R514
3.3K
R512
1.5M/0.25W
VD512
EU2A
VD513
EU2A
V511
A1015Y
R517
10K
C514
0.01u
R518
1K
VD514
HZ15C
VD511
EU1C
C511
22n/630V
C512
220P/2KV
V553
2SB985
R562
10K
R5633.9K
V556
2SD400
R573
1.2k
1
3
2
N504
7805
C541
220u
C542
0.01u
R522
0.22
L513
TEM2011
C508
0.1u
VD562
HZ10
R520
OPEN
20N+20N5N
36N7N 8N4N
2 3
1
N502
TL431
R550
470
C566
0.01
C567
0.01u/160V
R546
1K/0.5W
V552
2SC2878A
+5V-1
R572
27/0.5W
AUDIO GND
B5
+14.5V
V554
2SB892
R567
10K
R568
1.5K
VD556
1SS133
R565
1K
R543 1K1/2W
R544
120
VD557
1SS133
1
3
2
N503
7809
+9V
B9
+15V
C521
470u
C522
0.01u
GND
1
Vcc
6
Pump up
7
Input
5
Output
2
Out Vcc
3
Reference
4
N301
LA7840
V621
A1015Y
VD624
1SS133
R620
10K
C621
47u
R622
1K
+12V
VD625
1SS133
C622
10u
R621
27K
VD621
1SS133
R623
100k
R277
00
Z101
Q1036C1
V104
C1815
C115
22P
C117
0.01u
C118
68P
C121
0.47u/50V
R112
5.6K
R116
47K
T102
A-TX04
+5V
JUMP5
(OPEN)
VD304
C267
100u
C266
0.01u
L102 15uH
C105
470uH
VD101
1SS133
R274
330K
+5V-2
R510 33K
B3
+27V
CRT
V902
2SC2688
V904
2SC2688
V906
2SC2688
VD901
1SS133
VD902
1SS133
VD905
1SS133
R917
390
R925
390
R937
390
C904
470P
C905
470P
C907
470P
R914
0.5W3.3K
R921
0.5W3.3K
R928
0.5W3.3K
1
2
XS903
1
2
3
4
XP902
200V
HEAT
GND
GND
9V
G
B
R
1
2
XP903
R916 3.3K
R929
4.7K
R946 3.3K
R963
18K 3W
R964
18K 3W
R965
18K 3W
C902
2KV 2200P
R920
2W/2.0
TP-46R
TP-46G
TP-46B
C909
47u/16V
R922
2.2
V908
C1815Y
R901
10K
R902
47K
SPOT KILL
1
2
3
4
5
6
7
XP201
9V
G
B
R
SPORT KILL
GND
C903
0.01u
DRAW
1
SOURCE
2
GND
3
Vin
4
OCP/FB
5
N501
STR-G9656
R119
1K
R270
00
R271
00
R273
00
R772
16K
R773
30K
R774
110K
1
2
XZ501
1
2
XP501
1
2
3
XP702
1
2
3
XS702
C220
100u
C222
0.01u
1
2
3
4
5
6
7
XS201
GND
M
DK/BG/I
C519
0.01u
VD518
1N4148
R250
2W 68
R254
1W 100
*
*
*
*
*
*
*
C510
0.47u
C498
4.7u250V
R903
220K
R264
3.3K
V207
C1815Y
R218
1K
C307
0.056u
C227
20P
C228
0.1u
L205
27uH
VD801
R533
5.6M/0.5W
R532
5.6M/0.5W
!
!
!
!
!
!
!
!
!
!
!
29inch R447=10K
FOR SOUND M SYS
R749
680
1
2P
1
XS701
1
2P
1
XS703
TO BACK LIGHT CONT PART
1
XS805
1
1
3P
RLGND
21F8A
NOTE:
Design and specification are subject to change without notice.
CONTENT
1. Contents…………………………………………………………………………1
2. Product code illumination and series introduction………………………2
3 Features…………………………………………………………………3
4 Safety Precaution……………………………………………………….4
5 Warning and cautions…………………………………………………..5
6 Net Dimension…………………………………………………………..11
7 Remote controller Functions…………………………………………12
8 Program Diagram ………………………………………………………13
9 Maintenance Service and Trouble Shooting…………………….13
10. Circuit Diagram………………………………………………………22
11. Circuit Explanation……………………………………………………25
12. Adjustment…….……………………………………………………..29
13. Damageable Parts List……………………………………………….30
14. Information of Resistors and Capacitors………………………………..31
CONTENT
2. Product code illumination and series introduction
21 F 8A
CRT catercorner 21inch
Pure Flat tube
Product code illumination and series introduction
Color television appearance
3. FEATURES
FEATURES
FUNCTION
1 Main IC 8829B
2 CRT Pure Flat
3 Color system PAL
4 Audio system BG
5 NO.of channels 218
6 OSD language
ENGLISH / Thai
7
PIC
Multi-picture modes
8 AV stereo
9 Super woofer
10 Surrounding sound
11 Treble/bass boost
12 Left/right balancer
13 NICAM
14 Multi-audio modes
15 Tone adjuster
16 MTS/SAP
17
AUDIO
Auto-volume leveling
18 AV input
19 AV output
20 DVD terminal
21 S-video jack
22 Headphone socket
23
JIC
SCART socket
24 Digital curtain
25 Slow fading on & off
26 Semitransparent menu
27 Non-flshing channel changing
28 ZOOM
29 16:9 mode
30 Games
31 Calendar
32 Child-lock
33 Multi-functional lock
34 No-picture listening
35 Background light
36 Auto-timer on
37 CCD
38
SOFTWARE
V-CHIP
FUNCTION
39 NO. of built-in speakers 2
40 Audio output power(W) 7W+7W
41
Total power input W
90W
42
Voltage range V
90-250V
43
Power frequency Hz
50/60HZ
44 Time of sleep timer(MINS) 120MIN
45 Net weight(KG)
46 Gross weight(KG)
47 Net dimension(MM)
48 Packaged dimension(MM)
49 Quantity for 20' container
50 Quantity for 40' container
51
PARAMETER
Quantiry for 40' high container
52 Acquired certificate
53
APPROVAL
Suitable market
4
4.
Safety Precautions
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical identify these parts and mechanical parts in this chassis have special safety-related
characteristics!
In the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of the manufacturer.
General Guidance
An Isolation Transformer should always be used during the servicing of a receiver whose chassis is
not isolated from the AC power line. Use a transformer of adequate power rating as this protects the
technician from accidents that might result in personal injury caused by electrical shocks.
It will also protect the receiver and it’s components from being damaged by accidental shorts of the
circuitry that might be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor
10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to the high vacuum and large surface area of the picture tube, extreme care should be taken in
handling the Picture Tube. Do not lift the Picture Tube by its Neck.
X-RAY Radiation
Warning:
The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture
Tube.
For continued X-RAY RADIATION protection, the replacement tube must be of the same type as
specified in the Replacement Parts List.
Before returning the receiver to the customer,
Always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as
antennas, terminals, etc., to make sure that the set is safe to operate without any danger of electrical
shock.
Safety Precautions
5
5. Warning and Cautions
1. When
y
ou clean the TV set, please pull
out the power plu
g
from AC outlet. Don't
clean the cabinet and the screen with
benzene, petrol and other chemicals.
4. To prevent the TV set from firing and
electric shock, don't
make the TV set rain
or moisture.
2.
In order to prolon
g
the usin
g
life of the
TV set, please place it on a ventilated
place.
5. Don't open the back cover, otherwise it is
possible to damage the components in the
TV set and harm you.
3.
Don't place the
TV set in the
sunshine or near
heat source.
6. When the TV set isn't going to be used
for long time or it is in thunder and
lightening, please pull out the plug from AC
outlet and the antenna plug from the cover
of the TV set.
Explanation on the display tube
Generall
y
, it is not needed to clean the tube surface. However, if necessar
y
,its surface can be
cleaned with a dr
y
cotton cloth after cuttin
g
off the power.Don't use an
y
cleanser. If usin
g
hard
cloth, the tube surface will be damaged.
CAUTION:
Before servicing receivers covered by this service manual and its supplements and
addenda, read and follow the
SAFETY PRECAUTIONS
.
Warning and Cautions
6
NOTE:
If unforeseen circumstances create conflict between the following servicing precautions and
any of the safety precautions, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1) Always unplug the receiver AC power cord from the AC power source before:
a. Removing or reinstalling any component, circuit board module or any other assembly of the
receiver.
b. Disconnecting or reconnecting any receiver electrical plug or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION:
A wrong substitution part or incorrect installation polarity of electrolytic capacitors
may result in an explosion hazard.
d. Discharging the picture tube anode.
2) Test high voltage only by measuring it with an appropriate high voltage meter or other
voltage-measuring device (DVM, FETVOM, etc.) equipped with a suitable high voltage probe. Do
not test high voltage by “drawing an arc”.
3) Discharge the picture tube anode only by (a) first connecting one end of an insulated clip lead
to the degaussing or kine aquadag grounding system shield at the point where the picture tube
socket ground lead is connected, and then (b) touch the other end of the insulated clip lead to the
picture tube anode button, using an insulating handle to avoid personal contact with high voltage.
4) Do not spray chemicals on or near this receiver or any of its assemblies.
5) Unless specified otherwise in this service manual, clean electrical contacts only by applying the
following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable
nonabrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol
(90%-99% strength)
CAUTION:
This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of contacts is not required.
6) Do not defeat any plug / socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.
7) Do not apply AC power to this instrument and/or any of its electrical assemblies unless all
solid-state device heat sinks are correctly installed.
8) Always connect the test receiver ground lead to the receiver chassis ground before connecting
the test receiver positive lead.
Always remove the test receiver ground lead last.
9) Use with this receiver only the test fixtures specified in this service manual.
CAUTION:
Do not connect the test fixture ground strap to any heat sink in this receiver.
Electrostatic ally Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
Warnin
g
and Cautions
7
components are usually called Electrostatic ally Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field effect transistors and semiconductor “chip”
components. The following techniques should be used to help reduce the incidence of component
damage caused by static electricity.
1) Immediately before handling any semiconductor component or semiconductor- equipped
assembly, drain off any electrostatic charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available discharging wrist strap device, which
should be removed to prevent potential shock prior to applying power to the unit under test.
2) After removing an electrical assembly equipped with ES devices, place the assembly on a
conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of
the assembly.
3) Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4) Use only an anti-static type folder removal device. Some solder removal devices not classified
as “anti-static” can generate electrical charges sufficient to damage ES devices.
5) Do not use freon-propelled chemicals. These can generate electrical charges sufficient to
damage ES devices.
6) Do not remove a replacement ES device from its protective package until immediately before
you are ready to install it. (Most replacement ES devices are packaged with leads electrically
shorted together by conductive foam, aluminum foil or comparable conductive material).
7) Immediately before removing the protective material from the leads of a replacement ES
device, touch the protective material to the chassis or circuit assembly into which the device will
be installed.
CAUTION:
Be sure no power is applied to the chassis or circuit, and observe all other safety
precautions.
8) Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise even
some normally harmless motions such as mutual brushing of your clothes’ fabric or lifting of your
foot from a carpeted floor might generate static electricity sufficient to damage an ES device.)
General Soldering Guidelines
Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain
tip temperature within the range of 500
o
F to 600
o
F.
Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.
Keep the soldering iron tip clean and well tinned.
Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or 1.25cm) brush
with a metal handle. Do not use freon-propelled spay-on cleaners.
Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature. (500
o
F to 600
o
F)
b. Heating the component lead until the solder melts.
Warning and Cautions
8
c. draw the melted solder with an anti-static, suction-type solder removal device with solder
braid.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature. (500
o
F to 600
o
F)
b. First, hold the soldering iron tip and solder the strand against the component lead until the
solder melts.
c. Quickly move the soldering iron tip to the junction of the component lead and the printed
circuit foil, and hold it there only until the solder flows onto and around both the component
lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit board printed foil.
d. Closely inspect the solder area and remove any excess or splashed solder with a small
wire-bristle brush.
Remove /Replacement
Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and
then bent flat against the circuit foil. When holes are of slotted type, the following technique should
be used to remove and replace the IC. When working with boards using the familiar round hole, use
the standard technique as outlined.
Removal
Desolder and straighten each IC lead in one operation by gently prying up on the lead with the
soldering iron tip as the solder melts.
Draw away the melted solder with an anti-static suction-type solder removal device (or with solder
braid) before removing the IC.
Replacement
Carefully insert the replacement IC in the circuit board.
Carefully bend each IC lead against the circuit foil pad and solder it.
Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic
coating to the areas).
“Small-Signal” Discrete Transistor
Removal/Replacement
Remove the defective transistor by clipping its leads as close as possible to the component body.
Bend into a “U” shape the end of each of three leads remaining on the circuit board.
Bend into a “U” shape the replacement transistor leads.
Connect the replacement transistor leads to the corresponding leads extending from the circuit board
and crimp the “U” with long nose pliers to insure metal to metal contact then solder each connection.
Power Output, Transistor Device
Warning and Cautions
Warning and Cautions
9
Removal/Replacement
Heat and remove all solder from around the transistor leads.
Remove the heat sink mounting screw (if so equipped).
Carefully remove the transistor from the heat sink of the circuit board.
Insert new transistor in the circuit board.
Solder each transistor lead, and clip off excess lead.
Replace heat sink.
Diode Removal/Replacement
Remove defective diode by clipping its leads as close as possible to diode body.
Bend the two remaining leads perpendicularly to the circuit board.
Observing diode polarity, wrap each lead of the new diode round the corresponding lead on the
circuit board.
Securely crimp each connection and solder it.
Inspect (on the circuit board copper side) the solder joints of the two “original” leads. If they are not
shiny, reheat them and if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1) Clip each fuse or resistor lead at top of the circuit board hollow stake.
2) Securely crimp the leads of replacement component around notch at stake top.
3) Solder the connections
CAUTION: Maintain original spacing between the replaced component and adjacent components
and the circuit board to prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that
bonds foil to the circuit board causing the foil to separate from or “lift-off” the board. The following
guidelines and procedures should be followed whenever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the following procedure to install a jumper
wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).
1) Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper
as absolutely necessary).
2) Carefully scratch away the solder resist and acrylic coating (if used) from the end of the
remaining copper pattern.
3) Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it around the IC
Warning and Cautions
10
pin. Solder the IC connection.
4) Route the jumper wire along the path of the out-away copper pattern and let it overlap the
previously scraped end of the good copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At other connections
Use the following technique to repair the defective copper pattern at connections other than IC Pins.
This technique involves the installation of a jumper wire on the component side of the circuit board.
Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if the jumper
wire opens.
Trace along the copper pattern from both sides of the pattern break and locate the nearest
component that is directly connected to the affected copper pattern.
Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the
pattern break to the lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components or
sharp edges.
Warning and Cautions
6. Net Dimension
21F8A
Net Dimension
REMOTE CONTROLLER GUIDE
Remote control functions
TV/AV exchanging button
Mute button
Numeric button
Picture mode selection
Volume up/dwon button
Program play-forward button
Calendar display button
Sound selection (I:5.5MHz,
II: 5.74MHz)
Sound mode selection
System preset button
Display button
Lock preset button
Scan button
DC standby button
Sleep timer
One/two/three digital button
Program number up/down button
Menu button
1 2 3
4
5
6
7
8 9
0
TV/AV
SCAN
LOCK
SYSTEM
DISP
-/--
MENU
CH+
CH-
VOL-
VOL+
P.STD S.STD
PRE
BACK
MODE
EXIT
LIGHT
GAME
CALENDAR
I/II
3
12
11
1
2
5
4
6
7
8
9
10
17
18
16
15
14
13
20
19
21
22
23
Program play-backward button
1
2
3
4
5
6
11
15
16
17
7
8
9
12
13
14
18
10
19
20
21
22
23
Invalid button
Game button
Game exit button
Selection buttons of game
background
Remote Function
7 .Remote
13
8.Program Diagram
Insert the power plug into the power line socket and insert the antenna plug into the antenna socket
on the rear panel. Press down the power switch of the TV set. The red indicator light goes on. If no
picture appears, press the button on the remote controller. Follow the steps below.
A Program preset
1) Auto searching and storing program
Press MENU button repeatedly on the remote controller to call up the “TUNING” menu on the
screen. Then Press the key ”CH-“ or “CH+” to select the bar “ATUO MEMORY” then press the
“VOL+” to make sure. If you want to stop ,press the key “VOL- ”.
2) Manual search and fine tune
Press MENU button repeatedly to call up the “TUNING” menu on the screen. Then Press the
key ”CH-“ or “CH+” to select the bar “SEARCH” then press the key “VOL+” to make sure.
3) Deleting channel number
Press MENU button repeatedly to call up the “TUNING” menu on the screen. Press ”CH-“ or
“CH+” buttons to select item “POSITION”, then use “VOL+”, “VOL-“ or number key to enter the
channel number that you do not want to see. Then press the key ”CH-“ or “CH+” to select
“SKIP” and select SKIP to ON. Now the program number is deleted. Repeat the above steps and
select SKIP to OFF, the deleted program number can be resumed.
B Volume tuning
Press VOLUME buttons “VOL+“ to increase and “VOL-“ to decrease the volume.
C. Personal preference settings
Picture modes
Press SELC.PIC repeatedly to change the Picture Mode among DYNAMIC, STANDARD, MILD,
MEMORY, PICTURE MUTE AND COLOR MUTE.
9.Maintenance Service and Trouble shooting
9.1.Factory adjustment information
Operation method: after the appliance is switched on, make the volume value to zero. Then
press “VOL-” key on the TV set and press the DISP button on remote controller at the same time
to enter the S state. Press DISP button one times and “S” will disappear, Repeat the first step,
you will enter the D mode. Now one “D” is displayed on the TV screen.
Press PRO- and PRO+ buttons to select items for adjustment.
Press VOL- and VOL+ buttons to adjust selected items.
Press the POWER button to switch off the appliance and go back to the normal state.
Maintenance menu (Table 8)
Program Diagram
14
Item
Specifications
Default Value
Variable
Mark
RCUT RED CUT OFF BALANCE 20 *
GCUT GREEN CUT OFF BALANCE 20 *
BCUT BLUE CUT OFF BALANCE 20 *
GDRV GREEN DRIVE BALANCE 40 *
BDRV BLUE DRIVE BALANCE 40 *
CNTX CONTRAST MAX VALUE 7F
BRTC BRIGHTNESS 48
COLC NTSC COLOUR CENTER VALUE 2E
TNTC TINT CENTER VALUE 48
COLP PAL COLOUR CENTER VALUE 20
COLS SECAM COLOUR CENTER VALUE 40
SCOL SUB COLOUR 07
SCNT SUB CONTRAST 0E
CNTC SUB CONTRAST CENTER VALUE 50
CNTN SUB CONTRAST MIN VALUE 08
BRTX SUB BRIGHTNESS MAX VALUE 35
BRTN SUB BRIGHTNESS MIN VALUE 35
COLX SUB COLOUR MAX VALUE 3F
COLN SUB COLOUR MIN VALUE 00
TNTX SUB TINT MAX VALUE 28
TNTN SUB TINT MIN VALUE 28
ST3 TV-3.58 SHARPNESS 25
SV3 AV-3.58 SHARPNESS 25
ST4 TV-4.43 SHARPNESS 25
SV4 AV-4.43 SHARPNESS 25
SVD DVD SHARPNESS CENTER VALUE 26
ASSH SHARPNESS 07
SHPX SHARPNESS MAX VALUE 38
SHPN SHARPNESS MIN VALUE 15
TXCX OSD CONTRAST MAX VALUE 1F
RGCN OSD CONTRAST MIN VALUE 1F
ABL ABL data 37
DCBS A part of Vider data in deyail 33
CLTO
The data when TV mode
SOUND SYS!=M
0B
CLTM
The data when TV mode
SOUND SYS=M
4B
CLVO
The data when YUV mode
SOUND SYS!=M
4B
CLVD
The data when YUV mode
SOUND SYS=M
4B
DEF A part of DEF COMP data in detail 01
SECD SECAM mode 0:off center 1:ON 35KHz 08
HPOS 50Hz HORIZONTAL POSITION 0F *
VP50
50Hz VERTICAL POSITION
02
*
HIT 50Hz VERTICAL HEIGHT 27 *
HPS 60Hz HORIZONTAL POSITION 05 *
VP60 60Hz VERTICAL POSITION 00 *
HITS 60Hz VERTICAL HEIGHT 01 *
VLIN 50Hz VERTICAL LINEAR CORRECTION 08
*
VSC 50Hz VERTICAL S CORRECTION 04
*
VLIS 60Hz VERTICAL LINEAR CORRECTION 00
*
VSS 60Hz VERTICAL S CORRECTION 00
SBY SECAM B-Y Black 08
SRY SECAM R-Y Black 08
BRTS SUB BRIGHTNESS 00
RAGC RADIO FREQUENCY AGC 28
Maintenance Service and Trouble shooting
15
Item
Specifications
Default Value
Variable
Mark
HAFC HORIZONTAL AUTO FREQUENCY CONTROL 09
V25 25 PERCENT OF VOLUME 20
V50 50 PERCENT OF VOLUME 30
V100 100 PERCENT OF VOLUME 40
MUTT Y-MUTE SOFT START 00
FLG0 FLAGS FOR IF 52
FLG1 FLAGS 04
REFP REF Pulse Position 00
RSNS R SENS 00
GSNS G SENS 00
BSNS B SENS 00
MOD MOD 30
STBY VCD/IF STANDBY 00
SVM SVM 60
VBLK V BLK Start/Stop 00
VCEK VERTICAL OUT 27
HSIZ HORIZONTAL SIZE 20
PRBR PRBR 20
TRUM TRUM 10
ECCT ECCT 10
CCB ECCB 10
EHT EHT 24
UCOM Miciom Control 00
PYNX PYNX 2E
PYNN PYNN 18
PYXS PYXS 22
PYNS PYNS 1E
RCUTS FOR YcbCr R CUTOFF 10
GCUTS FOR YcbCr G CUTOFF 00
BCUTS FOR YcbCr B CUTOFF 10
GDRVS FOR YcbCr R DRIVE 00
BDRVS FOR YcbCr R DRIVE 00
AV OPT AV OPT 06
OPT2 OPT2 38
WAIT TIME WAIT TIME 2F
CUR CEN CUR CEN C6
CUR STEP CUR STEP 01
AUSTP When Mute off, Vol. ATT up step number 02
MOD0 MODE0 91
MOD1 MODE1 05
MOD2 MODE2 A4
OSDF OSDF POSITION 68
OSD OSD POSITION 0C
OPT OPTION E7
You can change the D
Maintenance Service and Trouble shooting
16
Abnormal
N
ormal
1.
N
o raster and no sound
Check the fuse
Check VD503∼VD506 V513 C507
Check loading voltages of 127V 200V
Check if the connector electrode
Check if all loadin
g
resistors are normal
Check 12V
9V 5V
Check V552 or CPU
POWER control
circuit
Check D902 V902
and V901
There is breakdown i
n
horizontal circuit and N201
Check switch
powe
r
circuit
Check if rectifier diodes
breakdown
Replace the
rectifier diodes
Loading has
breakdown
Abnormal
N
ormal
Normal
Abnormal
Abnormal
N
ormal
Abnormal
Normal
Abnormal
Normal
Maintenance Service and Trouble shooting
17
Abnormal
Maintenance Service and Trouble shootin
g
Check the horizontal oscillation external
circuit of Z280 N201 and N201
N
ormal
There is
breakdown in
CRT broad
Check circuit
between pin18
pin20 in N201
No raster
Check if G2 voltage on CRT board is normal
Check heater voltage
Check the base electrode voltage of V444
2.
Check the voltage betwec
n
b
ace electrode an
d
connector electrode of v411
Check the circui
t
between pin 32 at N210
and H drive grade
Check all
voltages of pins
at X602
The heate
r
resister is
broken.
Check the connecto
r
electrode voltage o
f
V411
There is breakdown in horizontal
drive grade, Check V444 T401
R437
Check if FBT T402
V411or C415 C416 are
leakage of electricity
Check if pin 28
voltage 9V a
t
N201 is normal
Rechange ba
d
components o
r
remedy conten
t
circuit.
Check 9V powe
r
No
rm
a
l
Abnorma
Normal
Abnormal
N
ormal
Abnormal
A
b
n
o
rm
a
l
Yes
No
Lower
Normal
Normal
Abnormal
V411 is rosin joint o
r
b
roken
18
Horizontal bright line
Break R908 , let multimeter preset on R 1K and red meter rod grounding, let blac
k
meter rod tap pin 4 at N402.see if the bright line can wide at instant.
Check if R907 R448 are
rosin joint and the resisto
r
value of R448 changes
larger.
Check the
external circuit o
f
N201 and N201.
Normal
There is breakdown in the vertical outpu
t
grate.
Check if the connector o
f
the deflection yoke is
connected well,and C433is
rosin joint or cutoff, and the
external circuit of N402 an
d
N402.
Check 26V powe
r
circuit.
YES
NO
YES
NO
YES
NO
3.
Maintenance Service and Trouble shootin
g
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