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COLOR TELEVISION
SERVICE MANUAL
MODEL NO. PF29GA18A
CHASSIS NO. ETA-1D
Please read this manual carefully before service.
TABLE OF CONTENTS
SAFETY INSTRUCTIONS AND MAINTENANCE .......................................1
X-RAY RADIATION PRECAUTION..........................................................................................1
SAFETY PRECAUTION ...........................................................................................................1
PRODUCT SAFETY NOTICE...................................................................................................2
SAFETY SYMBOL DESCRIPTION ..........................................................................................3
MAINTENANCE........................................................................................................................3
ADJUSTMENTS .................................................................................................................4
SET-UP ADJUSTMENTS .........................................................................................................4
CIRCUIT ADJUSTMENTS........................................................................................................7
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION..................13
STRUCTURE BLOCK DIAGRAM ...........................................................................................13
CHASSIS DESCRIPTION......................................................................................................14
SERVICE DATA................................................................................................................15
TECHNICAL DATA OF KEY ICS ...........................................................................................15
SERVICE DATA OF KEY ICS................................................................................................38
APPENDIX
CIRCUIT DIAGRAM
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 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.
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.
1
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 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.
2
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
characteristics.
VDE 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.
3
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:
¢Ł The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
¢Ś 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.
4
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
5
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
Fig.3
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 I2C bus control, change the bus
data to adjust white balance.
6
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 1
Test Point Voltage (V) Test Point Voltage (V)
TP-130V (C821) 135V±1.5V TP-18V (C824) 16V±1V
TP-17V (C822) 15V±1V TP-5V-2 (C827) 5V±0.3V
TP-5V-1 (C828) 5V±0.3V TP-8V (C826) 8V±0.5V
TP-11V (C823) 10.5V± V TP-26V (C461) 30V±3V
TP-200V (C463) 195V±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.
7
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 29”¾3V
Negative of VD485 195”¾5V
CRT anode 29.5”¾1.5KV
Heater 6.3”¾0.3Vrms
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.
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 with a DC-500 high resistance meter and insulation resistance between the naked metal and
8
SERVICE MANUAL
degaussing coil to be over 20M.
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, blue "D" is displayed on the
upper center of the screen. To exit from the D 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 (GDET0104-03)
Table 3 Function Description for Bus Data
Symbol Description Data
OSD OSD Horizontal Position 63
OPT Optional Setting B7
RCUT R CUT OFF OPT
GCUT G CUT OFF OPT
PAGE1
BCUT B CUT OFF OPT
GDRV G DRIVE OPT
BDRV B DRIVE OPT
SCNT SUB CONTRAST 08
CNTN CONTRAST MIN 0A
CNTC CONTRAST CENTER 3B
CNTX CONTRAST MAX 66
CNTD CONTRAST MAX IN DVD F7
PAGE2
BRTN BRIGHT MIN.(difference from center) 35
BRTC BRIGHT CENTER 35
BRTX BRIGHT MAX.(difference from center) 15
BRTS SUB BRIGHT OPT
COLC COLOR CENTER NTSC 33
COLOR CENTER PAL(difference from
COLP 05
COLC)
COLD COLOR CENTER DVD 05
PAGE3 COLN COLOR MIN. 0D
COLX COLOR MAX.(difference from center) 5D
TNTN TINT MIN.(difference from center) 28
TNTC TINT CENTER 40
TNTX TINT MAX.(difference from center) 28
PAGE4 ST3 SHARP CENTER 3.58NTSC TV 15
ST4 SHARP CENTER OTHER TV 15
SV3 SHARP CENTER 3.58NTSC VIDEO 15
SV4 SHARP CENTER OTHER VIDEO 15
SVD SHARP CENTER DVD 15
ASSH ASYMMETRY-SHARPNESS 05
(continued)
9
SERVICE MANUAL
SHPN SHARP MIN(difference from center) 0A
SHPX SHARP MAX(difference from center) 0A
ABCL ABL date in detail 0F
DCBS A part of Video date in detail 15
The date when TV mode & SOUND SYS
CLTB 60
= B/G
The date when TV mode & SOUND SYS
CLTD 88
= D/K
PAGE5 The date when TV mode & SOUND SYS
CLTM AC
=M
The date when YUV mode & SOUND
CLVO AD
SYS != M
The date when YUV mode & SOUND
CLVD 88
SYS = M
OSDA OSD ABL and OSD CONTRAST 01
HPOS Horizontal Position OPT
Horizontal Position 60Hz(difference from OPT
HPS
HPOS)
VP50 Vertical Position 50Hz OPT
PAGE6 VP60 Vertical Position 60Hz OPT
HIT Hight 50Hz OPT
HITS Hight 60Hz(difference from HIT) OPT
VLIN V Linearity 50Hz OPT
VLIS V Linearity 60Hz(difference from VLIN) OPT
VSC VS Correction 50Hz OPT
VSS VS Correction 60Hz OPT
HBOW OPT
HPARA OPT
PAGE7
UBLACK 08
VBLACK 08
AGC RF AGC 30
HAFC AFC GAIN 86
NOIS 0F
NDTC Noise detection count test 1F
MUTT Y-MUTE FOR SOFT START 00
STAT CONTRAST UP FOR SOFT START 00
PAGE8
VL1 ALC off volume control level 09
VL25 No use 30
VL50 No use 40
VLX No use 5A
volume level when ALC on(IC
VA1 10
VER1.2_old)
VA12 No use 25
VA25 No use 3D
PAGE9 VA50 No use 57
VAX No use 7F
SVM MON/SVM CO MAX SVM DL SVM GAIN 10
VBLK V BLK start V BLK stop 00
VCEN V CENTERING 13
volume level when ALC on(IC
PAGE10 VB1 09
VER1.2_new)
VB25 No use 30
VB50 No use 4A
VBX No use 60
FLG0 FLAGS for IF 44
FLG1 FLAGS 02
UCOM Miciom control 00
(continued)
10
SERVICE MANUAL
OSDF OSD PLL DATE 7F
TB_COL Menu top OSD area plane color set 88
BB_COL Menu itmes OSD area plane color set 88
CL_COL1 Calendar OSD color 01
CL_COL2 Calendar OSD color 56
PAGE11
PYNX Normal H.SYNC max 15
PYNN Normal H.SYNC min 11
PYXS Search H.SYNC max 22
PYNS Search H.SYNC min 12
RCUTS R cut offset in DVD 00
GCUTS G cut offset in DVD 00
BCUTS B cut offset in DVD 00
PAGE12 GDRVS 00
BDRVS 00
AUSTP 04
BBCT 06
STBG S TRAP B/G 06
STI S TRAP I 08
STDK S TRAP D/K 08
STM S TRAP M 05
PAGE13
SSBG S TRAP HP/LP B/G 08
SSI S TRAP HP/LP I 08
SSDK S TRAP HP/LP D/K 08
SSM S TRAP HP/LP M 10
SYNC 00
SYBBN BB judgement 44
SYBBF BB judgement 40
SYSR Set WIN Pulse and HLOCK Pulse 4C
PAGE14
VCD0 00
VCD1 00
BL25 Balance 25 1E
BL49 Balance 49 50
MODE0 29
MODE1 0F
OV50 00
OV60 00
PAGE15
HOTEL 00
FM RADIO 01
SOUND M 01
SCR SAV 01
ENGLISH 01
FRENCH 01
GERMAN 01
RUSSIAN 01
PAGE16
INDONESIAN 01
MALAY 01
ARABIC 01
FARSI 01
INITIAL 00
LOCK MENU 01
CALENDAR 01
SEC-COL 02
PAGE17
DEMOKEY 01
SVIDEO 01
DVDVIDEO 01
LOGO 00
(continued)
11
SERVICE MANUAL
LOGO1COLOR OPT
LOGO2COLOR OPT
LOGO1LINE OPT
LOGO2LINE OPT
PAGE18
LOGO1SIZE OPT
LOGO2SIZE OPT
LG1 OPT
LG2 OPT
WID OPT
WIDS OPT
DPC OPT
DPCS OPT
PAGE19
KEY OPT
KEYS OPT
ECCT OPT
ECCB OPT
HEHT 04
DPC69 OPT
HIT69 OPT
TREC 30
PAGE20
TREX 60
VEHT 00
SBY 08
SRY 08
SECD 10
SEC29 00
BASC 40
BASX 70
PAGE21
MODE3 01
BALC 40
FVOL 13
NVOL 5F
Notes:
The data sheet may differ dependent on different models.
The data sheet may differ dependent on different CRTs for the same model.
12
SERVICE MANUAL
STRUCTURE AND CHISSIS FUNCTION DESCRIPTION
1.STRUCTUE BLOCK DIAGRAM
IR KEY
Video
Amplifier
TUNER TMP8897 H.OUT
V.OUT
Power Supply Audio
AVOUT
Circuit Amplifier
AVIN
AVIN
Structure Block Diagram for ETA-1 Chassis Series
13
SERVICE MANUAL
2. CHASSIS DESCRIPTION
General Description
ETA-1D chassis is applied in PF29GA18A 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 8897PSBNG-4VB6 for PAL/NTSC small signal processing and bus control
EEPROM AT24C16 for data memory
LA78041 for vertical output power amplifying
LA42102 for audio power amplifying
TA1343N for audio processor
FSCQ1265RTYDTU for power circuit adjustment and control
The following features are available in the chassis:
Color systems: PAL, NTSC
Sound systems: D/K B/G I M
236 programs preset
AV stereo
2
I C bus control
Electronic program table
Intelligent lock
Biorhythm
Calendar inquiry
The chassis mainly uses the following ICs and assemblies.
Table 5 Key ICs and Assemblies
Serial
Position Type Description
No.
1 N201 AT24C16 EERPOM
GDET0104-03 2IN1 IC (Small signal processor +
2 N202
(TMPA8897PSANG) micro control unit (MCU))
3 N603 LA42102 Audio power amplifier
4 N301 LA78041 Vertical scan output stage circuit
Switch-mode power supply
5 N801 FSCQ1265RTYDTU
control
6 A001 TAF5-C4I23 Tuner
14
SERVICE MANUAL
SERVICE DATA
TECHNICAL DATA OF KEY ICS
1.MCU and Signal Processor for a PAL/NTSC TV
TMPA8897CMANG /CPANG/CRANG /CSANG
1.General Description
The TMPA8897CPANG 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 contains PIF, SIF, Video, multi-standard chroma,
Sync, RGB processors.
Mask ROM: TMPA8897CPBNG (ROM size: 48k)
Mask ROM: TMPA8897CRBNG (ROM size: 56k)
Mask ROM: TMPA8897CSBNG (ROM size: 64k)
OTP ROM: TMPA8897PSBNG (ROM size: 64k)
Weight: 8.85 g (typ.)
15
SERVICE MANUAL
2.Features
MCU CCD Decoder
High speed 8-bit CPU (TLCS-870/X series) Digital data slicer for NTSC
Instruction execution time: 0.5 s (at 8 MHz) OSD
(TMPA8873CPANG) Clock generation for OSD display
48-Kbytes ROM, 2-Kbytes RAM Clock generation for OSD display
ROM correction Font ROM characters: 384 characters
12 I/O ports Characters display: 32 columns ×12 lines
14-bit PWM output 1 ch for a voltage synthesizer Composition: 16 ×18 dots
7-bit PWM output 1 channel Size of character: 3 (line by line)
8-bit A/D converter 3 ch for a touch-key input with Color of character: 8 (character by character)
key ON wake-up CIRCUIT Display position: H 256/V 512 steps
Remote control signal preprocessor BOX function
Two 16-bit internal timer/counter 2 ch Fringing, smoothing, Italic, underline function
Two 8-bit internal timer/counter 2 ch Conform to CCD REGULATION
Time base timer, watchdog timer Jitter elimination
16 interrupt sources: external 5, internal 11
IIC bus interface (multi-master)
STOP and IDLE power saving modes
TV Processor
IF RGB/Base-Band
Integrated PIF VCO aligned automatically Integrated 1 H base-band delay line
Negative demodulation PIF Base-band TINT control
Multi-frequency SIF demodulator without external Internal OSD interface
Tank-coil Half-tone and transparent for OSD
SIF BPF built-in External YCbCr interface for DVD
SIF Trap filter built in RGB cut-off/drive controls by bus
Video ABCL (ABL and ACL combined)
Integrated chroma traps Sync.
Black stretch Integrated fH ×640 VCO
Y-gamma DC coupled vertical ramp output (single)
Chroma Sync output
Integrated chroma BPFs AV Switch
PAL/NTSC demodulation 2 for video
2 for audio(mono)
or 1 for audio (Stereo, 2ch ATT), controlled by IIC bus
ALC (Auto-Audio Level Control)
16
SERVICE MANUAL
3.Block Diagram
17
Monolithic Linear IC
LA42102
10W 2-Channel BTL Power Amplifier
Tentative
LA42000 series is power IC which made Pin compatible possible altogether in 3 to 20W.
It enables communization of a set board.
mono, stereo, mono with volume function , stereo with volume function..
They realized PCB layout communalization of an audio power block of TV.
Functions
Po 10W x 2ch (VCC=14V,RL=8,THD=10%)
Builtin Standby function.
Builtin Mute function.
Full complement of built-in protection circuits
(Protection from shorting to ground, shorting to VCC,
load shorting, and overheating.)
Maximum Ratings at Ta=25
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max No signal 22 V
Allowable power dissipation Pd max Infinite heat sink 15 W
Maximum junction temperature Tj max 150
Thermal resistance jc 3 /W
Operating temperature Topr -25 to +75
Storage temperature Tstg -40 to +150
Operating Conditions at Ta=25
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 14 V
Recommended load resistance RL 8
Allowable operating voltage range VCC op 10 to 20 V
Operating Characteristics at Ta = 25,VCC = 14V,RL = 8,f = 1kHz,Rg = 600
Ratings
Parameter Symbol Conditions Unit
min typ max
Standby current ISTB Amplifier off - 0 10 uA
Quiescent current ICCO Rg=0 , RL=open 70 mA
Output power Po THD=10% 8 10 - W
Total harmonic distortion THD Po=1W - 0.06 0.2 %
Voltage gain VG Vo=0dBm 33 35 37 dB
Output noise voltage VNO Rg=0,BPF=20Hz to 20kHz - 0.2 0.4 mVrms
Ripple rejection SVRR Rg=0,fR=100Hz,VCCR=0dBm 40 50 - dB
Channel separation Sep. Rg=10k, Vo=0dBm 50 60 - dB
Muting attenuation ATT Vo=1Vrms, BPF=20Hz to 20kHz 80 90 - dB
Muting control voltage VMUTE - H Muting on 1.7 - 3.0 V
The Pin 6 voltage VMUTE - L Muting off 0 - 0.5 V
Standby control voltage VSTB - H Amplifier on 2.5 - 20 V
The Pin 5 voltage VSTB - L Amplifier off 0 - 0.5 V
Input resistance Ri 21 30 39 k
Pdmax
18
Allowable power dissipation ,Pdmax - W
Al heat sink
16 Infinite heat sink Mounting
15 torque 39N.
14 Flat washer
100x100x1.5mm Silicone grease
12 applied
11.7
10
jc=3/W
8
50x50x1.5mm
6
5.8
4
No Fin
2
0
-20 0 20 40 60 80 100 120 140 160
Ambient temperrature, Ta -
Block Diagram
Standby VCC
5 7
Input amplifier
12 + OUT1
IN1 2
Ri= Output amplifier
30k
11 - OUT1
MUTE 6
Vcc / ground shorting protection circuit PWR
Load shorting protection circuit 10 GND
Thermal protection circuit
PRE
GND
3
8 + OUT2
IN2 4
Ri= Output amplifier
30k
9 - OUT2
Input amplifier
1
Ripple
Filter
Equivalent Circuit
LA42102
Ripple PRE PWR
Filter IN1 GND IN2 STBY MUTE VCC +OUT2 -OUT2 GND -OUT1 +OUT1 N.C.
1 2 3 4 5 6 7 8 9 10 11 12 13
C3 C4 C5
47uF 10uF 1000uF
/25V /10V /25V RL RL
C1 C2
* 4.7uF
/10V * 4.7uF
/10V R1
C8
0.1uF
C9
0.1uF
C7
0.1uF
C6
0.1uF
15k R4 R5 R3 R2
2.2 2.2 2.2 2.2
+ 5V
*The LA42102 uses a zero bias type input circuit, and the input pin potential is about zero volts.(0.01V)
Determine the polarity orientation of these capacitors based on the DC current from the circuit
Connected to the LA42102 front end.
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 1.8AP-P while LA78041 has supply voltage of 30V and output current of 2.2AP-P.
LA78040/LA78041 (N602)
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
Package Type:TO-220-7H
Fig.12
2) Block Diagram
Fig.1 3 Block diagram
32
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.
33
SERVICE MANUAL
3) Pin Configuration
Table 12 8-lead MAP
8-lead TSSOP
Pin Name Function
A0-A2 Address Inputs A0 1 8 VCC VCC 1 8 A0
SDA Serial Data A1 2 7 WP WP 2 7 A1
SCL Serial Clock Input A2 3 6 SCL SCL 3 6 A2
GND 4 5 SDA SDA 4 5 GND
WP Write Protect
NC No Connect
Bottom View
Fig. 14
8-pin PDIP
8-lead SOIC
A0 1 8 VCC
8
A0 1 VCC
A1 2 7 WP
7
A1 2 WP
A2 3 6 SCL
6
A2 3 SCL
GND 4 5 SDA
5
GND 4 SDA
Fig. 15
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
34
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 13
WP Pin Part of the Array Protected
Status 24C01A 24C02 24C04 24C08 24C16
At Vcc Full (1K) Full (2K) Full (4K) Normal Upper
Array Array Array Read/ Half
Write (8K)
Operation Array
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
Fig.16
7) Refer to Table 21 about Functions and Data of the IC's Pins.
35
www.fairchildsemi.com
FSCQ1265RT
Green Mode Fairchild Power Switch (FPSTM) for
Quasi-Resonant Switching Converter
Features
· Optimized for Quasi-Resonant Converter (QRC) OUTPUT POWER TABLE
· Advanced Burst-Mode operation for under 1 W standby 230VAC ±15%(2) 85-265VAC
PRODUCT
power consumption Open Frame(1) Open Frame(1)
· Pulse by Pulse Current Limit (7A)
FSCQ0765RT 100 W 85 W
· Over load protection (OLP) - Auto restart
· Over voltage protection (OVP) - Auto restart FSCQ1265RT 170 W 140 W
· Abnormal Over Current Protection (AOCP) - Latch FSCQ1565RT 210 W 170 W
· Internal Thermal Shutdown (TSD) - Latch
· Under Voltage Lock Out (UVLO) with hysteresis
· Low Startup Current (typical : 25uA) Table 1. Notes: 1. Maximum practical continuous power
in an open frame design at 50°C ambient. 2. 230 VAC or
· Low Operating Current (typical : 6mA) 100/115 VAC with doubler.
· Internal High Voltage SenseFET
· Built-in Soft Start (20ms)
· Extended Quasi-resonant Switching for Wide Load Range
Typical Circuit
Application
· CTV Vo
· DVD Receiver
· Audio Power Supply
AC
IN
Description
Dr ain
FSCQ1265R T
In general, Quasi-Resonant Converter (QRC) shows lower
EMI and higher power conversion efficiency compared to the PW M
Sync GN D
conventional hard switched converter with a fixed switching
frequency. Therefore, it is well suited for applications that are V FB V cc
sensitive to the noise, such as color TV and audio. The
FSCQ1265RT is an integrated Pulse Width Modulation
(PWM) controller and Sense FET specifically designed for
Quasi-resonant off-line Switch Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes integrated fixed frequency oscillator, under
voltage lockout, leading edge blanking (LEB), optimized gate
driver, internal soft start, temperature compensated precise
current sources for a loop compensation and self protection
circuitry. Compared with discrete MOSFET and PWM Figure 1. Typical Flyback Application
controller solution, it can reduce total cost, component count,
size and weight simultaneously increasing efficiency, produc-
tivity, and system reliability. This device is a basic platform
well suited for cost effective designs of Quasi resonant
switching flyback converters.
Rev.1.0.0
©2004 Fairchild Semiconductor Corporation
FSCQ1265RT
Internal Block Diagram
Sync Vcc Drain
5 3 1
+
Quasi-resonant +
(QR) switching fs
Threshold - controller
- 9V/15V
Soft start
4.6V/2.6V : Normal QR Vcc good
3.0V/1.8V : Extended QR
Burst mode Auxiliary
Controller OSC Vref Main bias
VBurst
Normal operation Burst Switching
Normal
Vref Vref Vref operation Internal
Ibufb bias
IFB Ib
Vcc
Idelay PWM
FB
S Q
4
2.5R Gate
R Q