Page 1
FILE NO. SM-CTV-O-155
COLOR TELEVISION
SERVICE MANUAL
MODELNO.
CHASSIS NO. CN-18EA
21BM91
(V2)
Please read this manual carefully before service.
Page 2
TABLE OF CONTENTS
SPECIFICATIONS
............................................................................................................1
SAFETY INSTRUCTIONS AND MAINTENANCE.......................................2
X-RAY RADIATION PRECAUTION.........................................................................................2
SAFETY PRECAUTION ..........................................................................................................2
PRODUCT SAFETY NOTICE..................................................................................................3
SAFETY SYMBOL DESCRIPTION .........................................................................................4
MAINTENANCE.......................................................................................................................4
ADJUSTMENTS................................................................................................................ 5
SET-UP ADJUSTMENTS ........................................................................................................ 5
CIRCUIT ADJUSTMENTS....................................................................................................... 8
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION................. 24
STRUCTURE BLOCK DIAGRAM .........................................................................................24
BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM .......................................................25
CHASSIS DESCRIPTION .....................................................................................................26
SERVICE DATA............................................................................................................... 27
TECHNICAL DATA OF KEY ICS ..........................................................................................27
SERVICE DATA OF KEY ICS ............................................................................................... 51
REPLACEMENT OF PARTS
...................................................................................58
APPENDIX
1. CIRCUIT DIAGRAM
2. FINAL ASSEMBLY DIAGRAMS
3. FIND WIRING DIAGRAMS
4. PRINTED CIRCUIT BOARD LAYOUTS
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SPECIFICATIONS
SERVICE MANUAL
Table 1 Specifications
Model Number
Color
PAL, NTSC3.58, NTSC4.43, SECAM
system
RF system
Sound
system
Video system PAL4.43, NTSC3.58, NTSC4.43, SECAM (50/60Hz)
Channels preset 236 (0-235)
Antenna input
Picture tube
Effective screen dimensions
(Approx.)
Audio output
(THD
7%)
21BM91
75
406
B/G, D/K, I, M
(unbalanced)
305mm
3W+3W
Power source 220V ~, 50Hz
Weight (Approx.)
Dimensions
(W
H D) (Approx.)
Rated power consumption
(220V ~, 50Hz)
Designs and specifications are subject to change without notice.
590
22kg
451
87W
475mm
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SERVICE MANUAL
SAFETY INSTRUCTIONS AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION
PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT SAFETY NOTICE”INSTRUCTION
BELOW.
X-RAY RADIATION PRECAUTION
1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit
X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any
operating circumstances must not exceed the rated value. When checking the EHT, use the High
Voltage Check procedure in this manual using an accurate EHT voltmeter.
2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation,
which ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT
must be
3. Some components used in this TV have safety related characteristics preventing the CRT from
emitting X-ray radiation. For continued safety, replacement component should be made after
referring the PRODUCT SAFETY NOTICE below.
4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT
anode. So ensure that the maximum EHT voltage does not exceed the rated value after service
and adjustment.
identical to the original fitted as specified in the parts list.
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working
on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for
working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take
extreme care while handling.
1.4 Do not hold the CRT by the neck as this is a very dangerous practice.
2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly
as supplied from factory.
3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable
isolating transformer of beyond rated overall power when servicing or connecting any test
equipment for the sake of safety.
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SERVICE MANUAL
4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).
5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to
avoid electronic gun magnetized and decrement in convergence of the CRT.
6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,
switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the
original place.
7. Replace blown fuses within the TV with the fuse specified in the parts list.
8. When replacing wires or components to terminals or tags, wind the leads around the terminal
before soldering. When replacing safety components identified by the international hazard symbols
on the circuit diagram and parts list, it must be the company-approved type and must be mounted
as the original.
9. Keep wires away from high temperature components.
PRODUCT SAFETY NOTICE
CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE
SHOULD BE READ CAREFULLY BEFORE OPERA TING AND SERVICING THIS TV SET.
1. Many electrical and mechanical components in this chassis have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and the
X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements
rated at higher voltages or wattage, etc. Components which have these special safety
characteristics in this manual and its supplements are identified by the international hazard
symbols on the circuit diagram and parts list. Before replacing any of these components read the
parts list in this manual carefully. Substitute replacement components which do not have the same
safety characteristics as specified in the parts list may create X-ray radiation.
2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.
3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result
in too large load, causing fire.
4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being
walked on, modified, cut or pinched, particularly at plugs.
5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install
the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that
produce heat.
6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and
servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.
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SERVICE MANUAL
SAFETY SYMBOL DESCRIPTION
The lightning symbol in the triangle tells you that the voltage inside this product may
be strong enough to cause an electric shock. Extreme caution should be exercised
when working on the TV with the back removed.
This is an international hazard symbol, telling you that the components identified by
the symbol have special safety-related characteristics.
FDA This symbol tells you that the critical components identified by the FDA marking have
special safety-related characteristics.
UL This symbol tells you that the critical components identified by the UL marking have
special safety-related characteristics.
C UL This symbol tells you that the critical components identified by the C-UL marking
have been evaluated to the UL and C-UL standards and have special safety-related
VDE
characteristics.
This symbol tells you that the critical components identified by the VDE marking have
special safety-related characteristics.
MAINTENANCE
1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from
being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a
radiator or heat register, or where it is exposed to direct sunlight.
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or
impacts.
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.
4. Slots and openings in the cabinet should never be blocked by clothes or other objects.
5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition
are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.
Hold the plug firmly when disconnecting the power cord.
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.
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SERVICE MANUAL
ADJUSTMENTS
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new picture
tube is installed.
Perform the adjustments in the following order:
1. Color purity
2. Convergence
3. White balance
Notes:
① The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
② For some picture tubes, purity/ convergence adjustments are not required.
1. Color Purity Adjustment
Preparation:
Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and
focus.
1.1 Face the TV set north or south.
1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.
1.3 Operate the TV for at least 15 minutes.
1.4 Degauss the TV set using a specific degaussing coil.
1.5 Set the brightness and contrast to maximum.
1.6 Counter clockwise rotate the R /B low brightness potentiometers to the end and rotate the green
low brightness potentiometer to center.
1.7 Receive green raster pattern signals.
1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to
display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet
around the neck of the CRT until the green zone is located vertically at the center of the screen.
1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is
obtained.
1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue
raster until purities of the three rasters meet the requirement.
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SERVICE MANUAL
Yok
Fig. 1
2. Convergence Adjustment
Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.
2.1 Center convergence adjustment
2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps 2.1.3～2.1.5 until optimal convergence is
obtained.
2.2 Circumference convergence adjustment
2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.
2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move
front of the deflection yoke up or down to obtain better convergence in circumference. Push the
mounted wedge in to fix the yoke temporarily.
2.2.3 Put the second wedge into bottom.
2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in
circumference.
2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the
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SERVICE MANUAL
deflection yoke assembly on the picture tube.
2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection
yoke assembly on the picture tube.
2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal
convergence. Tighten the lamp screw holding the deflection yoke assembly.
Fig. 2
4-pole Magnet Movement 6-pole Magnet Movement
Center Convergence by Convergence Magnets
Incline the Yoke Up (or Down) Incline the Yoke Right (or Left)
Circumference Convergence by DEF Yoke
3. White Balance Adjustment
Fig.3
Generally, white balance adjustment is made with professional equipment. It’s not practical to get
good white balance only through manual adjustment. For TVs with I
data to adjust white balance.
2
C bus control, change the bus
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SERVICE MANUAL
CIRCUIT ADJUSTMENTS
Preparation:
Circuit adjustments should be made only after completion of set-up adjustments.
Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with
2
I
C bus control, first change the bus data.
1. Degaussing
A degaussing coil is built inside the TV set. Each time the TV is powered on, the degaussing coil
will automatically degauss the TV. If the TV is magnetized by external strong magnetic field,
causing color spot on the screen, use a specific degausser to demagnetize the TV in the following
ways. Otherwise, color distortion will be shown on the screen.
1.1 Power on the TV set and operate it for at least 15 minutes.
1.2 Receive red full-field pattern.
1.3 Power on the specific degausser and face it to the TV screen.
1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.
1.5 Repeat the above steps until the TV is degaussed completely.
2. Confirmation and Adjustment for Voltage
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to
the rated value.
2.1 Make sure that the supply voltage is within the range of the rated value.
2.2 Connect a digital voltmeter to the voltage output terminal of the main PCB. Power on the TV and
set the brightness and sub-brightness to minimum. Ensure that the voltage from the main PCB
reads as follows.
2.3 Regulate voltage adjustment components on the power section until the +B the voltage reaches the
rated value.
Table 2
Test Point Voltage (V)
Negative of VD851 118V±2V
Negative of VD852 17V±1V
Negative of VD854 11V±1V
Negative of VD857 14V
+1V
-1.5V
Positive of C874 9V±0.5V
Positive of C878 5V±0.5V
Positive of C800 5V±0.25V
Note:
It’s impossible to check the power part separately from the main chassis board as the part is
mounted on the main chassis board. The power components, etc. should be checked for burnout
when power-on. If burned out, do not power on the TV again until the cause is found out.
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SERVICE MANUAL
3. High Voltage Inspection
Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high
voltage with the high-voltage testing equipment and heater voltage with the high-frequency
effective voltmeter. The rated values are shown as below.
Table 3
Test Point Voltage (V)
Negative of VD603
Negative of VD855A 190±5.0V
25±1.5V
27±1.5V (for BSC68V1 FBT only)
CRT anode
Heater 6.3±0.3Vrms
25±1.5KV
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the
FBT.
4.2 Power on the TV and preheat it for 15 min.
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
Before Adjusting After Adjusting
Fig. 4
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit
current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and ensure
no arcing and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be infinity
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SERVICE MANUAL
(
with a DC-500 high resistance meter and insulation resistance between the naked metal and
degaussing coil to be over 20MΩ.
6. SERVICE mode
6.1 To enter the DESIGN/SERVICE mode
Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the
MENU button on the TV to enter the SERVICE mode. In this case, red “S”is displayed on the
upper center of the screen. To exit from the S mode, turn off the TV set by the POWER button on
the remote control.
Caution: The user service mode adjustment can be changed only when service personnel adjust
the whole set data during servicing. As the control data have dramatic effects on functions and
performance of the TV, service personnel should not tell user how to enter the SERVICE mode to
avoid improper data settings.
6.2 Adjustments and bus data (CH08T0606)
Table 4 Function Description for Bus Data
MODE0
Bit Function Description Status
Audio system options (available during
Bit7.6
auto search and use of AUTO button)
Bit5
SECAM
Bit4
Bit3 V MUTE
INHIBIT
00: B/G 01: I
10: D/K 11: M
00: SECAM gate pulse width, 2.2
usec
01: 2.0 usec
10: 1.8 usec
11: SECAM demodulation inhibit
When changing channels:
0: Y-MUTE 1: RGB MUTE
Bit2 SECAM
Bit1 AUTO2 0: PAL 1: Without PAL
Bit0
Power-on modes
10
0: No 1: Yes
0: Memory on 1: Soft on
continued)
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SERVICE MANUAL
(
MODE1
Bit7 Write-in LOGO
Refresh AV terminals in main
0: No 1: Yes
0: Yes (Recommended) 1: No
Bit6
cycle
Bit5 RF NTSC options 0: No 1: Yes
Bit4 Screen saver 0: No 1: Yes
Bit3 M 0: No 1: Yes
Bit2 D/K 0: No 1: Yes
Bit1 I 0: No 1: Yes
Bit0 B/G 0: No 1: Yes
With Channel Lock, horizontal
0: Yes (Recommended) 1: No
Bit7
AFC is off?
Bit6 Mono system
1: Yes 0：No
MODE2
Bit5 Single language
TA1343 woofer or MDB output
Bit4
mode options
Bit 3 Pull down sub menus?
Bit 2
Bit 1
Auto language options
Bit.0
1: Yes 0：No
0: Mono output 1: Overlapped to main
channel（Recommended）
1: Yes 0：No
0 0 0 ENGLISH
0 0 1 FRENCH
0 1 0 GERMAN
0 1 1 RUSSIAN
1 0 0 INDONE
1 0 1 MALAY
1 1 0 FARSI
1 1 1 ARABIC
MODE3
BIT 7
(Recommended)
continued)
Small character processor 1: Old 0: New
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SERVICE MANUAL
(
Waiting time when changing
1: Fast (1 sec.) 0: Slow (2 sec.)
BIT 6
channels with 0-9 buttons
(Recommended)
1: No 0: Yes
BIT 5 DVD option
(Recommended)
Step length setting for lighting up
1: Large step (Recommended) 0：Small
BIT.4
gradually during power-on
Numeral in Arabic indicated in
step
0: No 1: Yes
BIT 3
local language?
BIT 2 PWM output option 0: No 1: Yes
BIT 1 Instant on
BIT 0
AV Switch 4053 option
1: Yes 0：No
0: No 1: Yes
Audio processing IC (SOUND
BIT 7
0: No 1: Yes
menu)
MODE4
BIT 6 Woofer option in SOUND menu
BIT 5 TA1343 option
BIT 4 No use
BIT 3
NJW1161 option (SRS IC)
NJW1160 option (BBE IC & SRS
BIT 2
IC)
BIT 1
BIT 0
NJW1137 option (BBE IC)
Soft IIC option
Bit 7 No use OPT
Bit 6
VCO adjustments
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: PIF VCO functions (PIFVCO = 10) during
auto search and search；
1: PIFVCO = 10 during turn-on，and PIFVCO =
00 in Normal mode
continued)
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SERVICE MANUAL
Bit 5 No use
Large-amplitude AFT switch when no
Bit 4
signal
Bit 3
Audio gain switch in MONO mode
Bit 2 Y-MUTE when changing channels 0: No 1: Yes
Turn-on logo display? (Logo
Bit 1
write-in function required)
Bit 0 No use
OSD
Horizontal position of OSD
RCUT R cut off
GCUT G cut off
1: Off 0: On
0：927mVrms at 25kHz/dev
1：500mVrms at 25kHz/dev
1: Yes 0: No
BCUT B cut off
GDRV G drive
BDRV B drive
CNTX Contrast Max.
BRTC Bright center
CNTC Contrast center
CNTN Contrast Min.
BRTX Bright Max.
BRTN Bright Min.
HPOS 50hz horizontal phase
VP50 V phase (50Hz)
00: -3usec 10: 01F: +3usec
0: V phase delay, 0H 7: 7H
HIT V size
00: -50% 20: 0% 3F: 50%
(continued)
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SERVICE MANUAL
HPS
Adjusting difference between horizontal centers in PAL and NTSC
VP60 V phase (60Hz)
HITS
Adjusting difference between vertical amplitudes in PAL and NTSC
VLIN V-linearity
VSC V-S correction
VLIS
VSS
Adjusting difference between vertical linear in PAL and NTSC
Shift data of 50 Hz/ 60 Hz Correction
HIT69 Vertical amplitude in 16:9 mode (PAL)
HIT69S Vertical amplitude in 16:9 mode (NTSC)
V01 Volume output data at 1%
V25
Volume output data at 25%
0: V phase delay, 0H 7: 7H
0: -15% 8: 0% F: 15%
0: -16% 8: 0% F: 16%
V50
V100
Volume output data at 50%
Volume output data at 100%
Bit 3.2 VCD standby
STBY
Bit 1.0 IF standby
VCEN Vertical centering
Bit 7 Arabic 1: Yes 0: No
Bit 6 Farsi 1: Yes 0: No
Bit 5 Malay 1: Yes 0: No
Bit 4 Indonesian 1: Yes 0: No
LANG
Bit 3 Russian 1: Yes 0: No
Bit 2 German 1: Yes 0: No
00: Normal 01: Normal
10: Normal 11: VCD standby
00: Normal 01: Normal
10: Normal 11: IF standby
00: -32% 20: 0% 3F: 30%
Bit 1 French 1: Yes 0: No
BIT 0 English 1: Yes 0: No
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SERVICE MANUAL
Table 5 Bus Data
Item Data Item Data Item Data Item Data
*MODE0 84 SCNT 09 HPOS 11 BSNS 00
*MODE1 1F CNTC 40 VP50 01 MOD 40
*MODE2 1B CNTN 08 HIT 18 STBY 00
*MODE3 18 BRTX 19 HPS 04 SVM 00
*MODE4 60 BRTN 20 VP60 02 VBLK 00
*LANG FF COLX 35 HITS 01 UCOM 00
NOT MENU 9E COLN 00 VLIN 05 VTST 00
MEUN ICON FB TNTX 28 VSC 00 PYNX 26
MAIN MEUN 91 TNTN 28 VLIS 00 PYNN 1B
MEUN CHAR 07 ST3 25 VSS 00 PYXS 22
MEUN CHAR
HIGH
02 SV3 30 VCEN
16
PYNS 1E
BBE 9C ST4 20 HIT69 14 BASC 40
OSDF 64 SV4 30 HIT69S 01 BASX 70
OSD 20 SVD 30 SBY 05 TREC 40
*OPT 60 ASSH 07 SRY 09 BALC 40
RCUT 40 SHPX 3F BRTS 00 BAS1 64
GCUT 20 SHPN 20 RAGC 20 BAS2 20
BCUT 20 TXCX 3F HAFC 09 BAS3 50
GDRV 40 RGCN 1F *V01 15 TRE1 64
BDRV 40 ABL 2C *V25 4D TRE2 20
CNTX 7F DCBS 13 *V50 65 TRE3 50
BRTC 40 CLTO 26 *V100 7F TA1343-06 6C
COLC 40 CLTM 22 WOOFER 40 NO USE 00
TNTC 48 CLTS 20 STAT 00 NO USE 64
TNTCAV 48 CLVO 24 FLG0 06 WON1 01
COLP F8 CLVD 20 FLG1 08 WON2 00
COLS 40 DEF 01 REFP 00 NOIS 01
DCOL 20 AKB 00 RSNS 00 VATT 70
SCOL 07 SECD 18 GSNS 00
Notes:
The data sheet may differ dependent on different models.
The data sheet may differ dependent on different CRTs for the same model.
Refer to table 4 set the data marked with “*” defending on functions of TVs.
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SERVICE MANUAL
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION
1. STRUCTURE BLOCK DIAGRAM
EE PRO M
AT2 4C1 6
D7 02
I
2
C
Y
Cb
Cr
S-Terminal
ABL
H
L
Bu tton s On
Circ ui for
The TV
TMP A88 01PS BN G
2IN I IC
N2 01
Rem ote con trol
HS 003 8
Rem ote
Sen sor
Tun er
U1 01
IF Pro-am p.
+SAW F
V in
V out
HE F40 53B P
AV Swit ch
TV Audio
N
3
50
A in
A out
N302
TA1343N
Lin e Drive
V4 04
I2C
TD A8 94 4 AJ
N3 01
T40 1
Vertical O ut
LA 780 40
N6 02
V9 01-V90 3
Am plifier
Vid eo
L
R
Horizonta l
Ou tpu t
V4 05
T40 2
FB T
HV
FV
SV
R G B
9V-2
220V
50Hz
CRT
Power Circuit
STR-G5653
N801
12V
120V
17V
9V
5V-1
5V-2
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SERVICE MANUAL
2. BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM
RT801 XT801
.
N801 T801etc.
Regulator
Switch
220V
50Hz
Hz
L802 C801 C80 2
Inter ference-
proof Ci rcuit
Degauss ing
Circuit
VD801 -VD804
C803- C806
Rectifier
Bridge
L803 C807
Filter
118V
17V
12V
17V
Sampling Amplifier
VD820
Horizontal
Output
V432
C125 C126
N121 R128
Regulator
V881 VD883
Regulator
C80
Line Drive
V431
Sound Powe r
Amplifier
N301
V883 VD887
Regulator
C874
amplifier
IF Pre-
V101
T402
FBT
HV FV SV
33V
5V-1
EEPROM
D702
N802 C878
Regulator
9V-2
Output Contr ol
V501-V503
V/R/L
190V
27V
Tuner
U101
2 in 1 IC
N201
Vertical
Output
N601
5V-2
2 in 1 IC
N201
Vertical
Output
N601
5V-2
5V-2
N701 D701
LED RMT
Circuit
Band Contr ol
V230 V231
2 in 1 IC
N201
V901-V903
Amplifier
Video
Second S ound
V204 V207
Trap
N302
N350
TA1343N
AV Switc h
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SERVICE MANUAL
3. CHASSIS DESCRIPTION
General Description
CN-18EA(V2) chassis is applied in 21BM91 series. By use of Toshiba V/C/D-MCU 2IN1 IC for TV
small signal processing and bus control, the chassis enables TV tuning, adjustment, control and
picture correction, featuring high-integration, high-performance-to-price ratio and high-
reliability and compact circuit with fewer external components. The chassis, widely
used in small and medium TVs, provides much more convenience for manufacturing and technical
service. It includes:
2IN1 IC TMAP8801PSBNG for PAL/NTSC/SECAM small signal processing and bus control
EEPROM AT24C16 for data memory
LA78040 for vertical output power amplifying
TA1343N for
TDA8944J for audio power amplifying
Thick-film IC STR-G5653 for power circuit adjustment and control
The following features are available in the chassis:
Color systems: PAL, NTSC, SECAM
Sound systems: D/K B/G I M
236 programs preset
AV stereo/Surround/Woofer
2
I
C bus control
Electronic program table
Intelligent lock
audio processor
Biorhythm
Calendar inquiry
The chassis mainly uses the following ICs and assemblies.
Table 6 Key ICs and Assemblies
Serial
No.
1 D702 AT24C16 EERPOM
2 N201
3 N301 TDA8943SF/TDA8944AJ Audio power amplifier
4 N302 TA1343N Audio processor
5 N602 LA78040 Vertical scan output stage circuit
6 N801 STR-G5653 Switch-mode power supply control
7 N350 HEF4053BP AV/TV Switch
8 U101 TDQ-5B6M Tuner
Position Type Description
CH08T0606
(TMPA8801PSBNG)
2IN1 IC (Small signal processor + micro control
unit (MCU))
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SERVICE MANUAL
SERVICE DATA
TECHNICAL DATA OF KEY ICS
1. TOSHIBA 2IN1 IC SERIES
1) General Description
Toshiba 2IN1 IC series are super ICs combined small signal processing with 8-bit micro control unit,
including TMPA8801/8802/8803/8807/8808/8809/8812/8813/8821/8823/ 8827/8829 with the following
features.
Table 7
Type
TMPA8801CSBNG/
CPBNG/CMBNG
TMPA8802CSBNG/
CPBNG/CMBNG
TMPA8803CSBNG/
CPBNG/CMBNG
TMPA8801CSCNG/
CPCNG/CMCNG
TMPA8807CSBNG/
CPBNG/CMBNG
TMPA8808CSBNG/
CPBNG/CMBNG
TMPA8809CSBNG/
CPBNG/CMBNG
TMPA8813CSNG/
CPNG/CMNG
TMPA8821CSNG/
CPNG/CMNG
TMPA8823CSNG/
CPNG/CMNG
TMPA8827CSNG/
CPNG/CMNG
TMPA8829CSNG/
CPNG/CMNG
TMPA8812CSDNG/
CPDNG/CMDNG
Type
(for ICs with OTP ROM)
TMPA8801PSBNG PAN/NTSC/SECAM 64K/48K/32K SDIP64
TMPA8801PSBNG NTSC 64K/48K/32K SDIP64
TMPA8801PSBNG PAN/NTSC 64K/48K/32K SDIP64
TMPA8801PSCNG PAN/NTSC/SECAM 64K/48K/32K SDIP64
TMPA8807PSBNG PAN/NTSC/SECAM 64K/48K/32K Yes SDIP64
TMPA8807PSBNG NTSC 64K/48K/32K Yes SDIP64
TMPA8807PSBNG PAN/NTSC 64K/48K/32K Yes SDIP64
TMPA8813PSNG PAN/NTSC 64K/48K/32K SDIP64
TMPA8821PSNG PAN/NTSC/SECAM 64K/48K/32K SDIP64
TMPA8821PSNG PAN/NTSC 64K/48K/32K SDIP64
TMPA8827PSNG PAN/NTSC/SECAM 64K/48K/32K Yes SDIP64
TMPA8827PSNG PAN/NTSC 64K/48K/32K Yes SDIP64
TMPA8812PSDNG NTSC 64K/48K/32K Yes SDIP56
Color System ROM
E/W
Correction
Packag
e
TMPA8801/8807PSBNG is applied in the chassis as an important TV signal processing chip.
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SERVICE MANUAL
TMPA8801/8807CMBNG /CPBNG/CRBNG /CSBNG
MCU AND SIGNAL PROCESSOR FOR A PAL/NTSC/SECAM TV
The TMPA8801/8807CMBNG /CPBNG /CRBNG /CSBNG is an
integrated circuit for a PAL/NTSC/SECAM TV. A MCU and a TV
signal processor are integrated in a 64-pin shrink DIP package.
The MCU contains 8-bit CPU, ROM, RAM, I/O ports,
timer/counters, A/D converters, an on-screen display controller,
remote control interfaces, IIC bus interfaces and the Closed
Caption decoder. The TV signal processor contains PIF, SIF, Video,
multi-standard chroma, Sync, RGB processors.
MROM: TMPA8801/8807CMBNG (ROM: 32k)
TMPA8801/8807CPBNG (ROM: 48k)
TMPA8801/8807CRBNG (ROM: 56k)
TMPA8801/8807CSBNG (ROM: 64k)
OTP: TMPA8801/8807PSBNG ROM size 64k
Weight: 8.85 g (typ.)
Fig. 7
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SERVICE MANUAL
2). Features
MCU
* High speed 8-bit CPU (TLCS-870/X series)
* Instruction execution time: 0.5 μs(at 8 MHz)
* MPA8801/8807CMBNG)
32-Kbytes ROM, 2-Kbytes RAM
(TMPA8801/8807CPBNG)
48-Kbytes ROM, 2-Kbytes RAM
(TMPA8801/8807CRBNG)
56-Kbytes ROM, 2-Kbytes RAM
(TMPA8801/8807CSBNG)
64-Kbytes ROM, 2-Kbytes RAM
* ROM correction
* 12 I/O ports
* 14-bit PWM output 1 ch for a voltage
synthesizer
* 7-bit PWM output 1 chan
* 8-bit A/D converter 3 ch for a touch-key input
with key ON wake-up CIRCUIT
* Remote control signal preprocessor
* Two 16-bit internal timer/counter 2 ch
* Two 8-bit internal timer/counter 2 ch
* Time base timer, watchdog timer
* 16 interrupt sources: external 5, internal 11
* IIC bus interface (multi-master)
* STOP and IDLE power saving modes
TV Processor
IF
* Integrated PIF VCO aligned automatically
* Negative demodulation PIF
* Multi-frequency SIF demodulator without
external Tank-coil
Video
* Integrated chroma traps
* Black stretch
* Y-gamma
Chroma
* Integrated chroma BPFs
PAL/NTSC/SECAM demodulation
CCD Decoder
* Digital data slicer for NTSC
OSD
* Clock generation for OSD display
* Font ROM characters: 384 characters
* Characters display: 32 columns×12 lines
* Composition: 16×18 dots
* Size of character: 3 (line by line)
* Color of character: 8 (character by character)
* Display position: H 256/V 512 steps
* BOX function
* Fringing, smoothing, Italic, underline function
* Conform to CCD REGULATION
* Jitter elimination
RGB/Base-Band
* Integrated 1 H base-band delay line
* Base-band TINT control
* Internal OSD interface
* Half-tone and transparent for OSD
* External YCbCr interface for DVD
* RGB cut-off/drive controls by bus
* ABCL (ABL and ACL combined)
Sync.
* Integrated fH×640 VCO
* DC coupled vert. ramp output (single)
EW correction with EHT input (For
TMPA8807 Only)
AV Switch (For TMPA8801 Only)
* 1 for video and 1 for audio (monaural)
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3). Block Diagram for TMPA8801
SERVICE MANUAL
Fig. 8
22
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4). Block Diagram for TMPA8807
SERVICE MANUAL
Fig. 9
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SERVICE MANUAL
5). Basic Structure
5.1). Internal Connections
TMPA8801/8807 has two pieces of IC chip in one package, using Multi-Chip-Package (MCP)
technology. One is
a micro controller (MCU) and the other one is a signal processor (SP) for a color TV. There are some
internal connections between these two ICs for handling below signals.
Table 8 Signal Name Direction Description
1 SCL M to S Internal IIC bus SCL
2 SDA Bi-direction Internal IIC bus SDA
3 OSD R M to S OSD signal connection
4 OSD G M to S OSD signal connection
5 OSD B M to S OSD signal connection
6 OSD Y/BL M to S OSD display control
7 OSD I, CS OUT M to S OSD half-tone control/Test pattern signal
8 C-Video S to M Composite video signal from internal video switch, for CCD
9 C-Sync S to M Composite sync. signal from sync. Separator, for CCD
10 HD S to M Horizontal timing pulse regenerated from FBP, for OSD
11 VD S to M Vertical timing pulse from sync. Separator, for OSD
12 CLK M to S 8 MHz clock
13 AVDD M to S Reference voltage for C-Video interface
14 ADC S to M A/D converter monitoring RF-AGC, R-Y and B-Y
Signal Name Direction Description
Functions of SP from MCU are controllable through the IIC bus of the internal connections.
5.2). Power Supply
TMPA8801/8807 has some power supplys and GND pins. Power supplies related MCU must be
applied at the
first. Power supplies for H.VCC and TV D.VCC are the second with at least 100 ms delay after MCU
power
ON. The other power supplies are the last, which are recommended to be supplied from a regulator
circuit
using FBP.
5.3). Crystal Resonator
TMPA8801/8807 requires only one crystal resonator, in stead that a conventional two-chip solution
requires
two resonators at least, one for MCU and the other one for SP. An oscillation clock with the crystal
resonator of TMPA8801 /8807is supplied for MCU operation, PIF VCO automatic alignment, alignment
free AFT,
chroma demodulation and horizontal oscillation. The oscillation frequency is very important so that
those
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SERVICE MANUAL
of functions work properly, so that designing the oscillation frequency accurately is required. The spec
of
crystal is recommended to be within
fosc: 8 MHz +/-20 ppm
ftemp: 8 MHz +/-40 ppm (-20°C to +65°C)
While RESET of MCU is active, the MCU function stops. Hardware and software initialization sequence
including power supplies control is required, because status of any hardware after the RESET period is
unknown especially horizontal oscillator which is a very basic timing generator of SP operation.
6).Terminal Interface
MCU Block
Table 9
Pin No. Pin Name Interface Ci I/O Function
1 P61/LED1/ADC 8 bit
(/KWU5)
(AIN5)
(LED1)
2 P60/ADC 8 bit
(/KWU4)
(AIN4)
3 P53/ADC 8 bit/TC1/Int2
(/KWU0)
(AIN0)
(TC1)
(INT2)
4 uP DVSS
I/O
(input)
(input)
(output)
I/O
(input)
(input)
I/O
(input)
(input)
(input)
(input)
Power
Supply
Key on wake up input
A/D converter analog input
High current sink open drain output
Key on wake up input
A/D converter analog input
Key on wake up input
A/D converter analog input
Timer/counter input
External interrupt input
GND
5 /Reset I/O Reset signal input or watchdog timer output
Address trap reset output
6
7
XOUT
XIN
Output
Input
X’tal connecting pins
8 TEST Input Test pin for out-going test.
Be tied to low.
9 uP DVDD
5 V
10 uP VVSS
54 uP
MPAGND
Power
Supply
Power
Supply
Power
Supply
VDD
Supply 5 V
GND for Slicer circuit
GND for
Oscillator circuit
(continued)
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SERVICE MANUAL
55 uP AVDD
5 V
56 P56 I/O
57 P52/SDA
(SDA)
58 P51/SCL
(SCL)
59 P50/PWM 7 bit/TC2/ Int0
(/PWM8)
(TC2)
(/INT0)
60 P40/PWM 14 bit
(/PWM0)
61 P20/Int5/Stop
(/INT5)
(/STOP)
62 P31/Int4/TC3
(INT4)
(TC3)
63 P30/Int3/RXIN
(INT3)
(RXIN)
64 P63/LED2/
(LED2)
Signal Processor Block
Pin No. Pin Name Function
11 TV AGND GND terminal for Analog block.
12 FBP in Input terminal for FBP.
13 HOUT Output terminal for Horizontal driving pulse.
14 HAFC 1 Terminal to be connected capacitor for HAFC filter.
Power
Supply
I/O
(I/O)
I/O
(I/O)
I/O
(output)
(input)
(input)
I/O
(output)
I/O
(input)
(input)
I/O
(input)
(input)
I/O
(input)
(input)
I/O
(output)
This terminal voltage controls H VCO frequency.
VDD for OSD Oscillator circuit
Supply 5 V
IIC bus serial
data input/output
IIC bus serial
clock input/output
7-bit D/A conversion (PWM) output
Timer/Counter input
External interrupt input
14/12-bit D/A conversion (PWM) output
External interrupt input
STOP mode release signal input
External interrupt input
Timer/Counter input
External interrupt input
Remote control signal
Preprocessor input
High current sink open drain output
Table 10
(continued)
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SERVICE MANUAL
15
V saw
Terminal to be connected capacitor to generate V saw signal.
V saw amplitude is kept constant by V AGC function.
16 V OUT Output terminal for Vertical driving pulse.
17 H.VCC 9 V VCC terminal for DEF circuit. Supply 9 V.
-(For TMPA8801) Connect to GND via resister 18
YS in
(For TMPA8807)
Terminal for switching of PIP mode
PIP signal (YUV input)
1.75V
Main signal (TV/EXT/YC)
GND
Ys voltage
19 Cb input Input terminal for Cb signal.
20 Y input Input terminal for Y signal. (Input level =1 Vp-p
21 Cr input
Input terminal for Cr signal. It is recommended that input
impedance is low.
22 TV DGND GND terminal for Digital block.
23 CIN Input terminal for Chroma signal.
24
25
EXT CVBS/Y (V2 IN)
TV DVCC
Input terminal for Video signal.
(Input level =1 Vp-p)
VCC terminal for Digital block.
This terminal voltage is clipped about 3.3 V by regulator circuit.
Supply TV DVCC voltage from HVCC
(#17) voltage via 27Ω.
26
TV IN
(V1 in)
Input terminal for Video signal.
(Input level =1 Vp-p)
(For TMPA8801)
27
28
fsc out
(For TMPA8807)
ABCL
AU out
Output terminal for fsc wave signal.
(Output level =0.55Vp-p typ.)
Input terminal for ABL/ACL control.
Output terminal for Audio signal.
(For TMPA8801)
Ew out
Output terminal for East-West correction signal.
(For TMPA8807)
29
IF VCC 9 V
VCC terminal for IF circuit.
Supply 9 V.
30
31
32
TVout
SIF out
EXT AU in
(For TMPA8801)
EXT in
Output terminal for detected PIF signal.
(Output level =2.2 Vp-p)
Output terminal for detected SIF signal.
Input terminal for External Audio signal.
Input terminal for EHT feedback signal.
(For TMPA8807)
33
34 DC NF
H.correc/SIF in
Input terminal for H correction and 2nd SIF.
Terminal to be connected capacitor for DC Negative
Feedback from SIF
Det output.
35
PIF PLL
Terminal to be connected with loop filter for PIF PLL.
This terminal voltage is controlled
PIF VCO frequency.
27
(continued)
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SERVICE MANUAL
36
37
38
39
IF VCC 5 V
S-Reg.F
Deemph/
Audio out
IF AGC
VCC terminal for IF circuit.
Supply 5 V.
Terminal to be connected capacitor for stabilizing internal bias.
Terminal to be connected capacitor for SIF Det
De-Emphasis.
Terminal to be connected with IF
AGC filter.
40 IF GND GND terminal for IF circuit.
41
42
IF IN
Input terminals for IF signals.
Pin 41 and Pin 42 are both input poles of differential amplifier.
43 RF AGC Output terminal for RF AGC control level.
44 YC VCC 5 V VCC terminal for Y/C circuit.
Supply 5 V.
45
46
Monitor out
Black Det
Output terminal for CVBS or Y signal selected by BUS (video
SW).
Terminal to be connected with
Black Det filter for
black stretch.
47
APC Fil
(Chrome PLL filter)
Terminal to be connected with
APC filter for Chroma demodulation.
This terminal voltage controls frequency of VCXO.
48 IKin Input terminal to sense AKB cathode current.
49 RGB VCC
9 V
VCC terminal for RGB circuit.
Supply 9 V.
50 ROUT Output terminal for R signal.
51 GOUT Output terminal for G signal.
52 BOUT Output terminal for B signal.
53 TV AGND GND terminal for Analog block.
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SERVICE MANUAL
7). Microcontrollers Descriptions (MROM version: TMPA8801/8807CMBNG /CPBNG /CRBNG
/CSBNG)
Fig. 10
8) Refer to Table 18 and Table 19 about Data of the IC’s Pins.
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SERVICE MANUAL
2. AUDIO POWER AMPLIFIER TDA8943SF
6 W MONO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER
1). General description
The TDA8943SF is a single-channel audio power amplifier with an output power of
6 W at an 8 Ω load and a 12 V supply. The circuit contains a Bridge Tied Load (BTL)
amplifier with an all-NPN output stage and standby/mute logic. The TDA8943SF
comes in a 9-lead single in-line (SIL) medium power package. The TDA8943SF is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
2). Features
Few external components
❷ Fixed gain
❷ Standby and mute mode
❷ No on/off switching plops
❷ Low standby current
❷ High supply voltage ripple rejection
❷ Outputs short-circuit protected to ground, supply and across the load
❷ Thermally protected
❷ Printed-circuit board compatible.
3). Block diagram
Fig. 11
4). Pinning information
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4.1) Pinning
4.2) Pin description
SERVICE MANUAL
Fig 12. Pin configuration.
Table 11 Pin description
Symbol
OUT− 1 negative loudspeaker terminal
VCC 2 supply voltage
OUT+ 3 positive loudspeaker terminal
IN+ 4 positive input
IN− 5 negative input
SVR 6 half supply voltage decoupling (ripple rejection)
MODE 7 mode selection input (standby, mute, operating)
GND 8 ground
n.c. 9 not connected
Pin Description
TDA8943SF:Mono Bridge Tied Load (BTL) audio amplifier, Max output power:6W
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SERVICE MANUAL
3. TDA8944J
2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER
1). General description
The TDA8944J is a dual-channel audio power amplifier with an output power of
2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
2). Features
❷ Few external components
❷ Fixed gain
❷ Standby and mute mode
❷ No on/off switching plops
❷ Low standby current
❷ High supply voltage ripple rejection
❷ Outputs short-circuit protected to ground, supply and across the load
❷ Thermally protected
❷ Printed-circuit board compatible.
3). Block diagram
Fig 13. Block diagram.
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4). Pinning information
4.1) Pinning
SERVICE MANUAL
Fig 14. Pin configuration.
4.2) Pin description
Table 12 Pin description
Symbol Pin Description
OUT1− 1 negative loudspeaker terminal 1
GND1 2 ground channel 1
VCC1 3 supply voltage channel 1
OUT1+ 4 positive loudspeaker terminal 1
n.c. 5 not connected
IN1+ 6 positive input 1
n.c. 7 not connected
IN1− 8 negative input 1
IN2− 9 negative input 2
MODE 10 mode selection input (standby, mute, operating)
(continued)
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SERVICE MANUAL
SVR 11 half supply voltage decoupling (ripple rejection)
IN2+ 12 positive input 2
n.c. 13 not connected
OUT2− 14 negative loudspeaker terminal 2
GND2 15 ground channel 2
VCC2 16 supply voltage channel 2
OUT2+ 17 positive loudspeaker terminal 2
TDA8944J: Stereo power amplifier, Max output power: 2×7W
5) Refer to Table 20 about Functions and Data of the IC’s Pins.
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SERVICE MANUAL
4. TV Sound Processor TA1343N
TA1343N is a sound processor controlled by I2C bus. It incorporates the following: 2-channel input,
3-channel output signal processing circuit, phase shift circuit for surround, and LPF fo r wo ofer channel.
ALS (Automatic Level Suppress er) circuit which prevents distort the si gnal in large signal condition for woofer
channel is also incorporated
1) Features
• Sound processing circuit
●2ch inputs (Lch, Rch)
●3ch outputs (Lch, Rch, Wch)
●Input matrix switch
●Volume control
●Bass, treble, and balance adjustment
●Woofer level and surround effect level adjustment Fig. 15
ALS (Automatic Level Suppresser) circuit
2) Built-in LPF for bass boost
• Surround circuit
2) Phase shift surround system z2 modes stereo surround
2) Pseudo stereo mode
2) Block Diagram
Fig 16 Block Diagram
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SERVICE MANUAL
3) Terminal Function
Table 13
Pin No. Name Function
DC offset canceling filter for bass boost.
1 Offset canceling filter
Connect a capacitor (10[µF]) between this terminal and GND.
2
3
4
5
6
8
7
9
10
15
11
14
φ5
φ4
φ3
φ2
Terminals for capacitors of the phase shift blocks.
Value of phase shift each block is φ[deg.]=-2tan
C is capacitance of external capacitor.
R is resistance of internal resister (10kΩ(Typ.)).
Lch input
Audio input terminals.
Rch input
GND GND terminal.
Filter for noise rejection of the bias.
Bias filter
Connect a capacitor (4.7[µF])
between this terminal and GND.
LPFs for bass control circuits.
Bass LPF (R)
Connect capacitors (0.027[µF])
Bass LPF (L)
between each terminals and GND.
HPFs for treble control circuits.
Treble HPF (R)
Connect capacitors (8200[pF])
Treble HPF (L)
between each terminals and GND.
-1
(2πfCR).
12
13
14
17
18
19
Wch output
Rch output
Lch output
Woofer LPF 1
Woofer LPF 2
Woofer LPF 3
Audio output terminal.
LPFs for bass boost circuit.
Connect a capacitor (0.033[µF])
between terminal 17 and GND.
Connect a capacitor (0.047[µF])
between terminal 18 and GND.
Connect a capacitor (0.022[µF])
between terminal 19 and GND.
(Continued)
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20
SERVICE MANUAL
Vcc terminal.
Vcc
Recommended operation voltage is 9[V]±10[%].
Smoothing filter for volume control.
21
Volume filter
Connect a capacitor (0.01[µF]) between this terminal and
GND.
Smoothing filter for bass boost level control.
22
Woofer LPF
Connect a capacitor (3.3[µF]) between this terminal and GND.
This filter is also for ALS circuit.
23
24
SCL SCL terminal.
SDA SDA terminal.
4) Refer to Table 21 about Functions and Data of the IC’s Pins.
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SERVICE MANUAL
5. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041
Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little bit
difference between the two amplifiers, that is, LA78040 has supply voltage of 24V and output current of
1.8A
LA78040 /LA78041
Vertical Deflection Output Circuit
1). Features
·Low power dissipation due to built-in pump-up circuit
·Vertical output circuit
·Thermal protection circuit built in
·Excellent crossover characteristics
DC coupling possible Fig. 17
while LA78041 has supply voltage of 30V and output current of 2.2A
P-P
P-P
.
2). Block Diagram
Fig. 18
3) Refer to Table 22 about Functions and Data of the IC’s Pins.
Package Type: TO-220-7H
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SERVICE MANUAL
6. EEPROM AT24C04/08/16
1) Features
Low-voltage and Standard-voltage Operation
-2.7 (Vcc=2.7V to 5.5V)
-1.8 (Vcc=1.8V to 5.5V)
Internally Organized 128x8(1K), 256x8 (2K), 512x8 (4K),
1024x8 (8K) or 2048x8 (16K)
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bi-directional Data Transfer Protocol
100kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility
Write Protect Pin for Hardware Data Protection
8-byte Page (1K, 2K), 16-byte Page (4K, 8K, 16K) Write Modes
Partial Page Writes are Allowed
Self-timed Write Cycle (10 ms max)
High-reliability
-Endurance: 1 Million Write Cycles
- Data Retention: 100 Years
Automotive Grade and Extended Temperature Devices Available
8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Package
2-wire
Serial EEPROM
AT24C01A 1K (128 x 8)
AT24C02 2K (256 x 8)
AT24C04 4K (512 x 8)
AT24C08 8K (1024 x 8)
AT24C16 6K (2048 x 8)
2) Description
The AT24C01A/02/04/08/16 provides 1024/2048/4096/8192/16384 bits of serial electrically erasable
and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits
each. The device is optimized for use in many industrial and commercial applications where low-power
and low-voltage operations are essential. The AT24C01A/02/04/08/16 is available in space-saving
8-pin PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a
2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to
5.5V) versions.
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SERVICE MANUAL
A
A
A
A
A
A
A
A
A
A
A
A
3) Pin Configuration
Table 14
8-lead TSSOP
8-lead MAP
Pin Name Function
A0-A2 Address Inputs
SDA Serial Data
SCL Serial Clock Input
WP Write Protect
0
1
2
GND
VCC
WP
SCL
SDA
1
2
3
4
VCC
1
2
3
4
8
WP
7
SCL
6
SDA
5
0
8
1
7
2
6
GND
5
NC No Connect
Bottom View
Fig. 19
8-pin PDIP
8-lead SOIC
VCC
0
GND
1
1
2
2
3
4
8
WP
7
SCL
6
SDA
5
0
1
2
GND
1
2
3
4
VCC
8
WP
7
SCL
6
SDA
5
Fig. 20
4) Pin Description
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device
and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin is open-drain
driven and may be wire-ORed with any number of other open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are
hard wired for the AT24C01A and the AT24C02. As many as eight 1K/2K devices may be addressed
on a single bus system (device addressing is discussed in detail under the Device Addressing section).
The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may
be addressed on a single bus system. The A0 pin is a no connect.
The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be
addressed on a single bus system. The A0 and A1 pins are no connects.
The AT24C16 does not use the device address pins, which limits the number of devices on a single bus
to one. The A0, A1 and A2 pins are no connects.
WRITE PROTECT (WP): The AT24C01A/02/04/16 has a Write Protect pin that provides hardware data
40
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SERVICE MANUAL
protection. The Write Protect pin allows normal read/write operations when connected to ground (GND).
When the Write Protect pin is connected to Vcc, the write protection feature is enabled and operates as
shown in table 14.
Table 15
WP Pin
Status
At Vcc Full (1K)
At GND Normal Read/Write Operations
5) Memory Organization
AT24C01A, 1K SERIAL EEPROM: Internally organized with 16 pages of 8 bytes each, the 1K requires
a 7-bit data word address for random word addressing.
AT24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each, the 2K requires
an 8-bit data word address for random word addressing.
AT24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each, the 4K requires
a 9-bit data word address for random word addressing.
AT24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires
a 10-bit data word address for random word addressing.
AT24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K
requires an 11-bit data word address for random word addressing.
6) Block Diagram
Part of the Array Protected
24C01A 24C02 24C04 24C08 24C16
Array
Full (2K)
Array
Full (4K)
Array
Normal
Read/
Write
Operation
Upper
Half
(8K)
Array
Fig.21
7) Refer to Table 23 about Functions and Data of the IC’s Pins.
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SERVICE MANUAL
7. HEF4053BP
TRIPLE 2-CHANNEL ANALOG MULTIPLEXER/DEMULTIPLEXER
1). Description
The HEF4053 is a triple 2-channel analog multiplexer/demultiplexer with a common enable input (E).
Each multiplexer/demultiplexer has two independent inputs/outputs (Y
(Z), and select inputs (Sn). Each also contains two-bidirectional analog switches, each with one side
connected to an independent input/output (Y
input/output(Z).
With (E) LOW, one of the two switches is selected (low impedance ON-state) by Sn. With E HIGH, all
switches are in the high impedance OFF-state, independent of S
VDD and V
The V
positive limit and V
For operation as a digital multiplexer/demultiplexer, VEE is connected to V
2). Block Diagram
are the supply voltage connections for the digital control inputs (SA to SC and E).
SS
to VSS range is 3 to 15V.The analog inputs/outputs (Y0, Y1 and Z) can swing between V
DD
as a negative limit. VDD-VEE may not exceed 15 V.
EE
and Y1) and the other side connected to a common
0
and Y1), a common input/output
0
to SC.
A
(typically ground).
SS
DD
as a
Fig. 22 Functional Diagram
42
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3) Function Table
SERVICE MANUAL
Table 16
Inputs
E Sn
L L Y0n-Zn
L H Y1n-Zn
H X none
Channel On
Notes
H=HIGH state （the more positive voltage）
L=LOW state （the less positive voltage）
X=STATE is immaterial
4) Refer to Table 24 about Functions and Data of the IC’s Pins.
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SERVICE MANUAL
8. SWITCH-MODE POWER SUPPLY IC STRG5653/G8656
1). General Description
The STRG5653/G8656 are part of the STRG5600/G8600 series thick-film ICs for switch-mode
power supply incorporating power MOSFET with a high-precise error amplifier. The ICs feature
fewer external components, small-size and standard power supply.
The series STR-G8600 use Chip on Chip technology with the same operation principle as
STR-G5600. Pin configuration, function and threshold of STR-G8600 are compatible with those of
STR-G5600.
2) Block Diagram
3) Function of Terminal
Terminal
No.
1 D Drain Terminal MOS FET drain
2 S Source Terminal MOS FET source
3 GND Ground Terminal Ground
4 VIN Power supply Terminal Input of power supply for control
5 O.C.P/F.B Overcurrent/Feedback
Symbols Description Functions
Fig.23
Table 17 Function of Terminal
Terminal
signals
Input of overcurrent detection signal
and constant voltage signals
4) Refer to Table 25 about Functions and Data of the IC’s Pins.
44
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SERVICE DATA OF KEY ICS
Table 18 Ground Resistance of TMPA8801PSBNG Pins
SERVICE MANUAL
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
1 2 3 4 5 6
31.70KΩ 31.70 KΩ 42.87 KΩ
7 8 9 10 11 12
44.31 KΩ
13 14 15 16 17 18
0.66 KΩ 39.81 KΩ 39.85 KΩ 10.55 KΩ 12.76 KΩ 24.70 KΩ
19 20 21 22 23 24
24.70 KΩ 24.67 KΩ 24.71 KΩ
25 26 27 28 29 30
0.56 KΩ 24.70 KΩ 16.65 KΩ 22.04 KΩ 0.3 KΩ 3.27 KΩ
31 32 33 34 35 36
3.29 KΩ 24.27 KΩ >2000 KΩ 362.3 KΩ >2000 KΩ
0
17.56 KΩ
0
0 0
0 0
5.5 KΩ 44.25 KΩ
39.79 KΩ
24.62 KΩ
0
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Pin No
Resistance
Note: Measured when Power-off
37 38 39 40 41 42
20.1 KΩ >2000 KΩ >2000 KΩ
43 44 45 46 47 48
13.6 KΩ 0.5 KΩ 3.6 KΩ 223.3 KΩ >2000 KΩ
49 50 51 52 53 54
0.5 KΩ 1217 KΩ 1396 KΩ 1352 KΩ
55 56 57 58 59 60
52 KΩ 60 KΩ 62 KΩ 60.8 KΩ >2000 KΩ >2000 KΩ
61 62 63 64
56.6 KΩ 83 KΩ 80.9 KΩ
0
>2000 KΩ >2000 KΩ
0
0 0
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SERVICE MANUAL
Table 19 Operating Voltage of TMPA8801PSBNG (N201)’s Pins
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
1 2 3 4 5 6
5V 5V 5.2V GND 5V 2.3V
7 8 9 10 11 12
2.3V GND 5V GND GND 1V
13 14 15 16 17 18
1.6V 6V 4.2V 4.8V 8.4V 2.0V
19 20 21 22 23 24
2.4V 2.4V 2.4V GND 0V 2.3V
25 26 27 28 29 30
3.4V 2.4V 4.8V 3.5V 9V 5V
31 32 33 34 35 36
1.8V 4.4V 2.8V 2.2V 2.5V 5V
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
Pin No
Voltage (V)
37 38 39 40 41 42
2.2V 4.4V 4.2V GND 1.7V 1.7V
43 44 45 46 47 48
4.2V 5V 1.2V 1.8V 2.5V GND
49 50 51 52 53 54
9V 2.5V 2.5V 2.5V GND GND
55 56 57 58 59 60
5V 0V 5V 5V 5V 4.9V
61 62 63 64
4.1V 5V 5V 0V
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SERVICE MANUAL
Table 20 Functions and Service Data of TDA8944J’s Pins
Pin
Functions Description
No.
1 Negative loudspeaker terminal 1 7.98
2 Ground channel 1 0 0 0
3 Supply voltage channel 1 14.9 5.8 7.7
4 Positive loudspeaker terminal 1 7.3
5 Not connected 0
6 Positive input 1 7.3
7 Not connected 0
8 Negative input 1 7.4
9 Negative input 2 7.3
Mode selection input (standby,
10
mute, operating)
Half supply voltage decoupling
11
(ripple rejection)
Reference Voltage
(V)
0 7.8 8.9
7.6
Digital Multimeter
Positive Resistance
(20KΩ)
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
Negative Resistance
(20KΩ)
12 Positive input 2 7.3
13 Not connected 0
14 Negative loudspeaker terminal 2 7.3
15 Ground channel 2 0 0 0
16 Supply voltage channel 2 14.8 3.5 3.5
17 Positive loudspeaker terminal 2 7.3
∞ ∞
∞ ∞
∞ ∞
∞ ∞
Table 21 Functions and Service Data of TA1343N’s Pins
Digital Multimeter
Pin No. Function Description
1 Offset canceling filter
2 φ2
3 φ3
4 φ4
Reference Voltage (V)
4.6 850
4.6 850
4.6 850
4.6 850
Positive Resistance (20KΩ)
(Continued)
47
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SERVICE MANUAL
5 φ5
6 Lch input
7 GND
8 Rch input
9 Bias filter
10 Bass LPF (R)
11 Treble HPF (R)
12 Wch output
13 Rch output
14 Treble HPF (L)
15 Bass LPF (L)
16 Lch output
17 Woofer LPF 1
18 Woofer LPF 2
4.6 850
4.5 850
0 0
4.5 860
5.9 850
4.6 850
4.6 850
4.5 850
4.4 850
4.6 850
4.5 850
4.4 850
5.3 850
5.2 870
19 Woofer LPF 3
20 Vcc
21 Volume filter
22 Woofer LPF
23 SCL
24 SDA
Table 22 Functions and Service Data of LA78040/78041’s Pins
Pin No. Function Description
1
2
3
4
Ground
Vertical output terminal
Pump supply voltage input
In-phase input terminal
5.3 850
8.9 300
3.2 870
4.5 870
4.8 1464
4.8 1464
GDM8145 Multimeter
Voltage of
Pin (V)
0 0 0
9.73 0.58 0.58
24.88
2.22 1.30 1.30
Measure with red probe
while grounding black probe.
Ground Resistance (KΩ)
Measure with black probe
while grounding red probe.
∞
∞
5
6
7
Inverting input terminal
Supply voltage
Pump supply voltage
output/vertical flyback pulse
output
2.22 4.58 4.55
24.13 1.55 1.55
2.61 7.09 5.93
48
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SERVICE MANUAL
Table 23 Functions and Service Data of AT24C08/16 Pins
Digital Multimeter
Pin No.
Function Description
Reference Voltage
(V)
Positive Resistance
(20KΩ)
Negative Resistance
(20KΩ)
1 Address input 0 0.001 0.00
2 Address input 0 0.001 0.00
3 Address input 0 0.001 0.00
4 Common ground 0 0.001 0.00
(Continued)
5 Clock line 5 7 4.83
6 Data line 4.99 6.9 5.15
7 PW write protect 4.99 9.5 5.31
8 Supply voltage 5 3.5 3.25
Table 24 Functions and Service Data of HEF4053BP’s Pins
Digital Multimeter
Pin No. Function Description
Reference Voltage
Positive Resistance
Negative
Resistance
(V)
(20KΩ)
(20KΩ)
1. Signal input terminal 0.01 6.9 6.32
2. Signal input terminal 2.47 6.7 5.89
3. Signal input terminal 0.21 6.9 6.4
4. Signal output terminal 2.59 6.7 5.83
5. Signal input terminal 2.58 6.7 5.91
6. Ground 0 0.001 0.00
7. Ground 0 0.001 0.00
8. Ground 0 0.001 0.00
9. Control signal input terminal 0.15 5.7 4.93
10. Control signal input terminal 0.15 5.7 4.93
11. Control signal input terminal 0.15 5.7 4.93
12. Signal input terminal 2.5 6.5 5.9
13. Signal output terminal 0 6.7 6.38
14. Signal input terminal 2.49 6.5 5.9
15. Audio output 2.45 6.5 5.94
16. Supply voltage 8.2 1.2 1.57
49
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Pin
No.
Table 25 Functions and Service Data of STR-G5653’s Pins
Functions Description
SERVICE MANUAL
Reference Voltage
(V)
Digital Multimeter
Positive Resistance
(20KΩ)
Negative Resistance
(20KΩ)
1 Drain terminal 146.3
2 Source terminal 0 0 0
3 Ground terminal 0 0 0
4 Power supply terminal 31.96
Overcurrent/Freedback
5
terminal
1.72 0.699 0.166
∞
∞
∞
∞
50
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SERVICE MANUAL
REPLACEMENT OF PARTS
DESCRIPTION
1.
Many electrical and mechanical components in this chassis have special safety-related
characteristics. Components which have these special safety characteristics in this manual and its
supplements are identified by the international hazard symbols or UL, FCC, FDA or VDE marking
on the circuit diagram and parts list. When replacing any of these components, substitute the one
which has the same safety characteristics as specified in the manual.
Description of the special markings:
A: The components identified by the A marking have special safety-related characteristics.
AE: The components identified by the AE marking are listed by EMC and have special safety-related
characteristics.
CB: The components identified by the CB marking have been evaluated to the CB standard.
E: The components identified by the E marking are listed by EMC
G: The components identified by the G marking have critical characteristics.
Z: The components identified by the Z marking have important characteristics.
Note:
Models and specifications of components in this table may be somewhat different with your unit. In this
case, please rely on the actual unit.
51
Page 54
Circuit Diagram
This circuit diagram is only for reference, specifications are subject to change without reference.
1. Any components identified by have special safety-related characteristics. Use replacement
Which have the same characteristics as original parts.
2. Cold ground Hot ground
Page 55
PRINTED CIRCUIT BOARD LAYOUT (1)
Page 56
PRINTED CIRCUIT BOARD LOYOUTS (2)
Page 57
Final Assembly Diagram for 21BM91
13
2
6
5
18
*400
4
11
22
21
1
15
22
11
15
16
14
7
8
9
20
19
18
17
16
15
14
13
12
T/JU8.949.224
11
10
9
8
7
6
T/JU8.667.003
5
4
3
2
1
Serial
Code No.
No.
Cover board
QA pass
Warning label
Fragile label
Wire clip A
Binding wire XJ-100
Tapping screw 4X20BAHCh
Tapping screw 3X12VwAHCh
Tapping screw 3X10KTHCh
Notched nut M5
Washer
AV plate
Rear plate
Side AV plate
Side AV terminals
Side AV PCB assembly
Distance clip
CRT RGB PCB assembly
Back cover
Front cover assembly
CRT assembly
Main PCB assembly
1
1
1
1
1
1
6
3
2
4
4
1
1
1
1
1
1
1
1
1
1
1
QtyParts Remarks
Page 58
Final Wiring Diagram for 21BM91
Side-set AV PCB Assembly
XPK03B
Wired Connector XS10A
Wired Connector XS10B
XP902
Control Buttons PCB Assembly
Wired Connector XPK03
Wired Connector XS161
Main PCB Assembly
XS301
XS504
XS503
Wired Connector XS601
XS201A
Wired Connector XS402
XS204
Wired Connector XP902
XS701
XS202
Soldered
Wired Connector XS500
XP901
Remote Sensor PCB Assembly
XS702
CRT RGB PCB Assembly
XSB06
CRT's Ground Wire
XSB08
XP903
Indictator PCB Assembly
Wired Connector XP903
XP801
From Power Switch Assembly
XS703A
XS402
XS401
A wire(Red)
To Degaussing Coil
B wire(Grey)
XS802
To Deflection Yoke
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