Changhong ETA-1D Schematic

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

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 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

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.

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:

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

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

C 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 (C821)

TP-17V (C822)

TP-5V-1 (C828)

TP-11V (C823)

TP-200V (C463)

135V±1.5V

15V±1V

5V±0.3V

10.5V±０．５V

195V±5V

TP-18V (C824)

TP-5V-2 (C827)

TP-8V (C826)

TP-26V (C461)

16V±1V

5V±0.3V

8V±0.5V

30V±3V

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±3V
Negative of VD485 195±5V

CRT anode 29.5±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.

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

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SERVICE MANUAL

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, 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

PAGE1

GCUT G CUT OFF OPT
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

PAGE2

CNTD CONTRAST MAX IN DVD F7
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

COLP

COLOR CENTER PAL(difference from

COLC)

05

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

PAGE5

PAGE6

PAGE7

PAGE8

PAGE9

PAGE10

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

CLTB

CLTD

CLTM

CLVO

CLVD

OSDA OSD ABL and OSD CONTRAST 01
HPOS Horizontal Position OPT

HPS

VP50 Vertical Position 50Hz OPT
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

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

VL1 ALC off volume control level 09
VL25 No use 30
VL50 No use 40

VLX No use 5A

VA1

VA12 No use 25
VA25 No use 3D
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

VB1

VB25 No use 30
VB50 No use 4A

VBX No use 60
FLG0 FLAGS for IF 44
FLG1 FLAGS 02

UCOM Miciom control 00

The date when TV mode & SOUND SYS

= B/G

The date when TV mode & SOUND SYS

= D/K

The date when TV mode & SOUND SYS

= M

The date when YUV mode & SOUND

SYS != M

The date when YUV mode & SOUND

SYS = M

Horizontal Position 60Hz(difference from

HPOS)

volume level when ALC on(IC

VER1.2_old)

volume level when ALC on(IC

VER1.2_new)

60

88

AC

AD

88

OPT

10

09

(continued)

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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

PAGE11

PAGE12

PAGE13

PAGE14

PAGE15

PAGE16

PAGE17

CL_COL2 Calendar OSD color 56

PYNX Normal H.SYNC max 15
PYNN Normal H.SYNC min 11
PYXS Search H.SYNC max
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
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

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

VCD0 00

VCD1 00

BL25 Balance 25 1E

BL49 Balance 49 50
MODE0 29
MODE1 0F
OV50 00
OV60 00
HOTEL 00
FM RADIO 01
SOUND M 01
SCR SAV 01
ENGLISH 01
FRENCH 01
GERMAN 01
RUSSIAN 01
INDONESIAN 01
MALAY 01
ARABIC 01
FARSI 01
INITIAL 00
LOCK MENU 01
CALENDAR 01
SEC-COL 02
DEMOKEY 01
SVIDEO 01
DVDVIDEO 01
LOGO 00

22

(continued)

11

PAGE18

PAGE19

PAGE20

PAGE21

SERVICE MANUAL

LOGO1COLOR OPT
LOGO2COLOR OPT
LOGO1LINE OPT
LOGO2LINE OPT
LOGO1SIZE OPT
LOGO2SIZE OPT
LG1 OPT
LG2 OPT
WID OPT
WIDS OPT
DPC OPT
DPCS OPT
KEY OPT
KEYS OPT
ECCT OPT
ECCB OPT
HEHT 04
DPC69 OPT
HIT69 OPT
TREC 30
TREX 60
VEHT 00
SBY 08
SRY 08
SECD 10
SEC29 00
BASC 40
BASX 70
MODE3 01
BALC 40
FVOL 13
NVOL 5F

Notes:

① The data sheet may differ dependent on different models.

② The data sheet may differ dependent on different CRTs for the same model.

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SERVICE MANUAL

STRUCTURE AND CHISSIS FUNCTION DESCRIPTION

1.STRUCTUE BLOCK DIAGRAM

IR KEY

Video

Amplifier

TUNER

TMP8897

H.OUT

V.OUT

Power Supply

Circuit

AVIN

AV I N

AVOUT

Audio

Amplifier

Structure Block Diagram for ETA-1Ｄ Chassis Series

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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

● I2C 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

No.

Position Type Description
1 N201 AT24C16 EERPOM
2 N202

GDET0104-03
(TMPA8897PSANG)

2IN1 IC (Small signal processor +

micro control unit (MCU))
3 N603 LA42102 Audio power amplifier
4 N301 LA78041 Vertical scan output stage circuit

5 N801 FSCQ1265RTYDTU

Switch-mode power supply

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.)

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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) 　

●(TMPA8873CPANG) ●Clock generation for OSD display

48-Kbytes ROM, 2-Kbytes RAM

●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

●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

OSD

●Clock generation for OSD display

●Display position: H 256/V 512 steps

●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

●SIF BPF built-in ●External YCbCr interface for DVD

●SIF Trap filter built in ●RGB cut-off/drive controls by bus

Video

●Integrated chroma traps

●Black stretch ●Integrated fH ×640 VCO

●Y-gamma ●DC coupled vertical ramp output (single)

●Half-tone and transparent for OSD

●ABCL (ABL and ACL combined)

Sync.

Chroma

●Integrated chroma BPFs

●PAL/NTSC demodulation ●2 for video

or 1 for audio (Stereo, 2ch ATT), controlled by IIC bus

●Sync output

AV Switch

●2 for audio(mono)

●ALC (Auto-Audio Level Control)

16

3.Block Diagram

SERVICE MANUAL

17

10W 2

-

Channel BTL Power Amplifier

Monolithic Linear IC

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=8Ω,THD=10%)

・ Built–in Standby function.
・ Built–in Mute function.
・ Full complement of built-in protection circuits

(Protection from shorting to ground, shorting to V

load shorting, and overheating.)

CC,

LA42102

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

Operating temperature Topr -25 to +75

Storage temperature Tstg -40 to +150

θjc

3

℃

℃/W

℃
℃

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

Ω

W

θjc=3℃/W

Operating Characteristics at Ta = 25℃,V

Parameter Symbol Conditions

= 14V,RL = 8Ω,f = 1kHz,Rg = 600Ω

CC

Ratings

Unit

min typ max

Standby current I

Quiescent current I

Amplifier off - 0 10 uA

STB

Rg=0 , RL=open 70 mA

CCO

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,V

Channel separation Sep.

Rg=10kΩ, Vo=0dBm

=0dBm 40 50 - dB

CCR

50 60 - dB

Muting attenuation ATT Vo=1Vrms, BPF=20Hz to 20kHz 80 90 - dB

V

- H Muting on 1.7 - 3.0 V Muting control voltage

MUTE

（The Pin 6 voltage）

（The Pin 5 voltage）

Input resistance Ri 21 30 39

V

- L

MUTE

V

- H Amplifier on 2.5 - 20 V Standby control voltage

STB

V

- L Amplifier off 0 - 0.5 V

STB

Muting off 0 - 0.5 V

kΩ

18

Infinite heat sink

16

15

14

100x100x1.5mm

12

11.7
10

8

50x50x1.5mm

6

5.8
4

No Fin

2

Allowable power dissipation ,　Pdmax -

0

-20 0 20 40 60 80 100 120 140 160

Ambient temperrature, Ta - ℃

Pdmax － Ｔａ

Al heat sink
Mounting
torque 39N.㎝
Flat washer
Silicone grease
applied

Block Diagram

Standby

5

V

CC

7

Ri=

30kΩ

Input amplifier

Output amplifier

Vcc / ground shorting protecti on circuit
Load shorting protection circuit
Thermal protection circui t

12

11

10

+ OUT1

- OUT1

PWR
GND

IN1

2

MUTE

6

PRE

GND

3

IN2

4

Ri=

30kΩ

Output amplifier

Input amplifier

8

9

+ OUT2

- OUT2

1

Ripple

Filter

Equivalent Circuit

LA42102

Ripple

Filter

1 2 3 4

C3
47uF
/25V

*

C1

4.7uF
/10V

PRE
GND

STBYIN1 IN2

5

C2

4.7uF

*

/10V

6 7 8 9 10 11

C4

10uF

/10V

R1

15kΩ

+ 5V

CC

1000uF

/25V

C5

+OUT2V

RL

C8

0.1uF
R4

2.2Ω

-OUT2 +OUT1MUTE

C9

0.1uF
R5

2.2Ω

PWR

GND

-OUT1

0.1uF

2.2Ω

12

RL

C7

R3

*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.

C6

0.1uF
R2

2.2Ω

N.C.

13

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

A

A

A

A

A

A

A

A

A

A

A

A

3) Pin Configuration
Table 12

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. 14

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. 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

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.16

7) Refer to Table 21 about Functions and Data of the IC’s Pins.

35

FSCQ1265RT

www.fairchildsemi.com

Green Mode Fairchild Power Switch (FPS
Quasi-Resonant Switching Converter

Features

• Optimized for Quasi-Resonant Converter (QRC)

• Advanced Burst-Mode operation fo r und e r 1 W stand by
power consump ti on

• Pulse by Pulse Current Limit (7A)

• Over load protection (OLP) - Auto restart

• Over voltage protection (OVP) - Auto restart

• Abnormal Over Current Protection (AOCP) - Latch

• Internal Thermal Shutdown (TSD) - Latch

• Under Voltage Lock Out (UVLO) with hysteresis

• Low Startup Current (typical : 25uA)

• Low Operating Current (typical : 6mA)

• Internal High Voltage SenseFET

• Built-in Soft Start (20ms)

• Extended Quasi-resonant Swit chi n g for Wide Lo ad Ra ng e

Application

•CTV

• DVD Receiver

• Audio Power Supp l y

PRODUCT

FSCQ0765RT 100 W 85 W

FSCQ1265RT 170 W 140 W

FSCQ1565RT 210 W 170 W

Table 1. Notes: 1. Maximum practical continuous power
in an open frame design at 5 0°C ambient. 2. 230 VAC or
100/115 VAC with doubler.

Typical Circuit

OUTPUT POWER TABLE

230VAC ±15%

Open Frame

(2)

(1)

TM

) for

85-265VAC

Open Frame

(1)

VVVVoooo

Description

In general, Quasi-Resonant Converter (QRC) shows lower
EMI and higher power conversion efficiency compared to the
conventional hard switched converter with a fix ed switchin g
frequency. Therefore, it is well suited for applications that are
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
controller solu tio n, i t ca n re duc e total cost, component count,
size and weight simultaneously increasing efficiency, produc­tivity, and system reliability. Th is device is a basic plat form
well suited for cost effective designs of Quasi resonant
switching flyback converters.

AAAACCCC

IIIINNNN

FFFFSSSSCCCCQQQQ1111222266665555RRRRTTTT

SSSSyyyynnnncccc

PPPPWWWWMMMM

VVVV

FFFFBBBB

VVVVcccccccc

Figure 1. Typical Flyback Application

DDDDrrrraaaaiiiinnnn

GGGGNNNNDDDD

©2004 Fairchild Semiconductor Corporation

Rev.1.0.0

FSCQ1265RT

Internal Block Diagram

FB

Sync

5

+

Soft start

Threshold

4.6V/2.6V : Normal QR

3.0V/1.8V : Exte nded QR

-

Burst mode

V

Burst

Vcc

I

delay

Normal operation

Vref

I

bufb

Controller

Vref

I

FB

Burst Switching

4

2.5R

Quasi-resonant
(QR) switching

controller

Vref

Ib

OSC

PWM

fs

Vcc good

Auxiliary

Vref

Normal

operation

SQQ

R

R

Vcc Drain

3 1

+

-

9V/15V

Main bias

Internal

bias

Gate

driver

LEB

600ns

V

SD

V

Sync

ovp

Vcc good

SQQ

R

AOCP

SQQ

R

TSD

Power Reset

Vocp

2

GND

Figure 2. Functional Block Diagram of FS CQ1265RT

2

Pin Definitions

Pin Number Pin Name Pin Function Description

1 Drain High voltage power SenseFET drain connection.

2 GND This pin is the control ground and the SenseFET source.

3Vcc

4Vfb

5Sync

This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.

This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable
operation, a capacitor should be placed between this pin and GND. If the
voltage of this pin reaches 7.5V, the over load protection triggers resulting in
shutdown of the FPS.

This pin is internally connected to the sync detect comparator for quasi
resonant switching. In normal quasi-resonant operation, the threshold of the
sync comparator is 4.6V/2.6V. Meanwhile, the sync threshold is changed to

3.0V/1.8V in extended quasi-resonant operation.

FSCQ1265RT

Pin Configuration

TO-220F-5L

5.Sync

4.Vfb

3.Vcc

2.GND

1.Drain

Figure 3. Pin Configuration (Top View)

3

FSCQ1265RT

Absolute Maximum Ratings

(Ta=25°C, unless otherwise specified)

Parameter Symbol Value Unit

Drain-Source (GND) Voltage

Drain-Gate Voltage (R

(1)

=1MΩ)V

GS

Gate-Source (GND) Voltage V

Drain Current Pulsed

Single Pulsed Avalanche Energy

(2)

(3)

Continuous Drain Current (Tc = 25°C) I

Continuous Drain Current (T

=100°C) I

C

Supply Voltage V

Analog Input Voltage Range

Total Power Dissipation P

Operating Junction Temperature T

Operating Ambient Temperature T

Storage Temperature Range T

Thermal Resistance Rthjc 2.5 °C/W

V

I

E

V

V

DSS

DGR

GS

DM

AS

D

D

CC

sync

FB

D

J

A

STG

650 V

650 V

±30 V

36 A

950 mJ

5.3 A

3.4 A

20 V

-0.3 to 13V V

-0.3 to V

CC

50 W

+150 °C

-25 to +85 °C

-55 to +150 °C

DC

DC

DC

V

Notes:

1. T

= 25°C to 150°C

j

2. Repetitive rating: Pulse width limited by maximum junction temperature

3. L = 21mH, V

= 50V, R

DD

= 25Ω, starting Tj = 25°C

G

4