SERVICE DATA.................................................................................................................................. 22
TECHNICAL DATA OF KEY ICs ......................................................................................................................... 22
SERVICE DATA OF KEY ICs ............................................................................................................................... 43
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 identical to the original fitted as specified in the parts list.
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.
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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.
a.
Do not attempt to service this TV if you are not conversant with the precautions
and procedures for working on high voltage equipment.
b.
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.
c.
The CRT, if broken, will violently expel glass fragments. Use shatterproof
goggles and take extreme care while handling.
d.
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
any test equipment for the sake of safety.
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.
Replace blown fuses within the TV with the fuse specified in the parts list. 8. When
7.
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.
Keep wires away from high temperature components.
8.
isolating transformer of beyond rated overall power when servicing or connecting
5
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PRODUCT SAFETY NOTICE
CAUTION:
FOR YOUR PROTECTION
THE FOLLOWING PRODUCT SAFETY NOTICE
SHOULD BE READ CAREFULLY BEFORE
OPERATING 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.
6
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SAFETY SYMBOL DESCRIPTION
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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.
8
MAINTENANCE
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MECHANICA DISASSEMBLIES
CABINET BACK REMOVAL
1. Refer to Figure 1, remove 7screws.
2.
Pull off cabinet back and remove.
9
CHASSIS REMOVAL
Remove cabinet back.
1.
Discharge the picture tube anode (2nd anode lead) to the dag coating (picture tube
2.
grounding lead).
3.
Disconnect Degaussing coil socket (KE). Picture tube socket, Deflection yoke connector
(KDY). Speaker connectors (KL and KR), and 2
4.
Remove chassis completely by sliding it straight back.
nd
anode lead.
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PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke or magnet assembly on the picture tube Neck.
Care must be taken to keep these assemblies intact, unless picture tube is being replaced.
Discharge the picture tube to the coating before handing the Tube.
1. Remove chassis, referring to Chassis Removal instructions.
2.
Place cabinet front face down on the soft surface.
3. Remove the screw one ach corner of the picture tube and GENTLY lift the picture tube out
of the cabinet.
4.
Install a replacement picture tube in reverse order.
5. Properly install the degaussing coil and picture tube grounding lead on the picture tube.
SeeFigure2.
Note: If the Picture Tube is being replaced, mount the Degaussing Coi l on the picture tube. See
following Figure1.Cabinet Back Removal
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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 ositioning.
Refer to Fig1, 2.
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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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.
Fig. 1
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 step 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
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.
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3. White Balance Adjustment
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
the bus data to adjust white balance.
²C bus control, change
13
Fig. 2
Fig.3
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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
2C bus control, first change the bus data.
I
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 1
Test Point Voltage (V) Test Point Voltage (V)
TP-130V 130V±1.5V TP-18V 20V±1V
TP-17V 17V±1V TP-5V-2 5V±0.3V
TP-5V-1 5V±0.3V TP-8V 8V±0.5V
TP-11V 11V±1V TP-26V 26V±1V
Tp200V 190V±5V
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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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 2
Test Point Voltage (V)
Negative of VD461 26 / 1V
Negative of VD485 190 / 5V
CRT Anode 27 / 1.5KV
Heater 6.3 / 0.3Vrms
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.
Fig. 4
5. Safety Inspection
Inspection for insulation and voltage-resistant
5.1
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
For 3 sec. and ensure no arcing and sparking.
point
Requirements for insulation resistance
5.2
Measure resistance between naked metal of the TV and feed end of the power cord to
be infinity with a DC-500 high resistance meter and insulation resistance between the
naked metal and
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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 Adjustment bus data (GDET0101-07)
Table 3 Function Description for Bus Data
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STRUCTURE and CHASSIS FUNCTION DESCRIPTION
1. BLOCK DIAGRAM
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2. CHASSIS DESCRIPTION
General Description
ETA-1 chassis is applied in SF21GA63 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 TMPA8873PSANG-4VB6 for PAL/NTSC small signal processing
and bus control
EEPROM AT24C16 for data memory ●
●
LA78040 for vertical output power amplifying
TFA9842AJ for audio power amplifying
●
Thick-film IC STR-G5653 for power circuit adjustment and control
●
The following features are available in the chassis:
●
●
●
●
The chassis mainly uses the following ICs and assemblies.
Color systems: PAL, NTSC
Sound systems: D/K B/G I M
●
236 programs preset
●
AV stereo
●
I2C bus control
Electronic program table
●
●
Intelligent lock
Biorhythm Calendar inquiry
Table 5 - Key ICs and Assemblies
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SERVICE DATA
TECHNICAL DATA OF KEY ICS
1.MCU and Signal Processor for a PAL/NTSC TV
TMPA8873CMANG /CPANG/CRANG /CSANG
1.General Description
The TMPA8873CPANG is an integrated circuit for a PAL/NTSC 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
TMPA8873 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.
No. Signal NameDirectionDescription
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
Functions of SP from MCU are controllable through the IIC bus of the internal connections.
2. Power Supply
TMPA8873 has some power supplies 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.
3. Crystal Resonator
TMPA8873 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 TMPA8873 is 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 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.
2-channel audio amplifier with volume control (SE: 1 W to 7.5 W)
1. General Description
The TFA9842AJ contains two identical audio power amplifiers. The TFA9842AJ can be used
as two Single-Ended (SE) channels with a volume control. The maximum gain is 26 dB.
The TFA9842AJ comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The TFA9842AJ is
pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J. The
difference between the TFA9843AJ and the TFA9843(B)J,TFA9842(B)J, TFA9841J is the
functionality of pin 7. The TFA9843AJ has a Volume Control (VC) on pin 7. The TFA9843(B)J,
TFA9842(B)J and TFA9841J have a mode select (Mode) on pin 7. The TFA9842AJ contains a
unique protection circuit that is solely based on multiple temperature measurements inside the
chip. This gives maximum output power for all supply voltages and load conditions with no
unnecessary audio holes. Almost any supply voltage and load impedance combination can be
made as long as thermal boundary conditions (number of channels used, external heat sink
and ambient temperature) allow it.
2. Features
2 Channel SE: 1 W to 7.5 W operation possibility
■
Soft clipping
■
Input clamps
■
Volume control
■
Standby and mute mode
■
No on/off switching plops
■
Low standby current
■
High supply voltage ripple rejection
■
Outputs short-circuit protected to ground, supply and across the load
■
Thermally protected
■
Pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J, TFA9841J.
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)
T24C16 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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3) Pin Configuration
40
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
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.
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Table 13
Part of the Array Protected WP PIN
Status
At Vcc
At GND Normal Read / Write Operation
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
24C01A 24C02 24C04 24C08 24C16
Full (1K)
Array
Full (2K)
Array
Full (4K)
Array
Normal
Read / Write
Operation
41
Upper Half
(8K) Array
Fig. 16
7) Refer to Table 21 about Functions and Data of the IC’s Pins.
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7. 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
Table 15
4) Refer to table 22 about Functions and Data of the IC’s Pins
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SERVICE DATA OF KEY ICs
Table 16 Ground Resistance of TMPA8873 Pins
43
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Table 17 Operating Voltage of TMPA8873(N202)’s Pins
44
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Table 18 Functions and Service Data TFA9842J’s Pins
Table 20 Functions and Service Data LA78040’s Pins
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Table 21 Functions and Service Data of AT24C08 / 16 Pins
Table 22 Functions and Service Data of STR-G5653’S Pins