Changhong CH-20 pf29t18 Schematic

FILE NO. SM-CTV-O-123

SERVICE MANUAL

CHASSIS NO. CH-20

Please read this manual carefully before service.

TABLE OF CONTENTS

SAFETY INSTRUCTIONS......................................................................................1

ADJUSTMENTS..................................................................................................... 4

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION................................... 17

SERVICE DATA ................................................................................................... 17

REPLACEMENT OF PARTS.................................................................................. 55

APPENDIX CIRCUIT DIAGRAMS

SERVICE MANUAL

INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE

ADJUSTMENTS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT SAFETY NOTICE”INSTRUCTION BELOW.

X-RAY RADIATION PRECAUTION

The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit

1. 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 preca utions 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.

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.

SERVICE MANUAL

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 th ese componen ts 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.

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.

This symbol tells you that the critical components identified by the UL marking

SERVICE MANUAL

have special safety-related characteristics.

C UL

VDE

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.

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 sta ble 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.

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. 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 t he 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.

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.

SERVICE MANUAL

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

Yok

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

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.

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

C bus control, change

the bus data to adjust white balance.

SERVICE MANUAL

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

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

C bus control, first change the bus data.

with 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 Power on the TV and receive Philips test pattern.

2.2 Check the resistors and coils for being burned. (If the fuse is burned out, do not power on the TV again until the cause is found out.)

2.3 Measure voltages of test points 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 table 1

Table 1

Test Point Voltage (V)

One Pin of L807 Positive of C834 Positive of C837 Positive of C832 One Pin of L806 Positive of C839 Positive of VD822 Positive of C429 Positive of C436A

145V±1.5V 12V±1V 12V±1V 16V±1V 16V±1.5V

3.3±0.3V

3.9±0.3V 195V±5V 48V±3V

(Continued)

SERVICE MANUAL

Positive of C434

Positive of C840 One Pin of 326 Positive of C424

Heater 6.3V±0.3Vrms

CRT anode voltages

3. High Voltage Inspection

Caution: No high voltage adjustment components inside the chassis. Please perform high voltage inspection in the following ways.

3.1 Connect a precise static high voltmeter to the second anode (inside the high voltage cap) of the CRT.

3.2 Plug in the supply socket (220V ~, 50Hz) and turn on the TV. Set the brightness and contrast to minimum (0μA).

3.3 The high voltage reading should be less than the limited EHT voltage.

3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the limitation in any case. Nominal EHT voltage Limited EHT voltage Remarks

29KV±1.5KV 33KV for 29" CRT

31.0KV±1.5KV 35KV for 34" CRT

Note: The data sheet may differ dependent on different CRTs.

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.

13.5V±1V 8V±0.5V 12V±1V 5V±0.5V

29KV±1.5KV (For 29” CRT)

31.0KV±1.5KV (For 34” CRT)

Before Adjusting After Adjusting

Fig. 4

SERVICE MANUAL

5. SERVICE mode

5.1 To enter the SERVICE mode Set the volume to 0 by the remote control. Then press and hold the MUTE button on the remote control and MENU button on the TV at the same time for over 2 seconds. In the S mode, press the POWER button to quit the S mode.

Use the ↓/↑buttons on the remote control to highlight an adjustment and the ←/→ buttons to adjust it.

Bus data

5.2

Item Adjustment Description

(“S”is red and other items are yellow.)

Table 2 Bus data

VX00 19 4:3 VX50 01 16:9 VX99 38 ZOOM 5VS/6VS Set to the optimal mode Half vertical center for 50/60Hz 5VA/6VA Set to the optimal mode Vertical amplitude for 50/60Hz 5SC/6SC Set to the optimal mode Vertical S correction for 50/60Hz 5VSH/6VSH Set to the optimal mode Vertical center for 50/60Hz 5VOF/6VOF Set to the optimal mode Character position for 50/60Hz 5HP/6HP Set to the optimal mode Parallelogram correction for 50/60Hz 5HB/6HB Set to the optimal mode Curve correction for 50/60Hz 5HSH/6HSH Set to the optimal mode Horizontal center for 50/60Hz 5HA/6HA Set to the optimal mode Horizontal amplitude for 50/60Hz 5EW/6EW Set to the optimal mode Pincushion and barrel correction for 50/60Hz 5UCR/6UCR Set to the optimal mode Upper corner correction for 50/60Hz 5LCR/6LCR Set to the optimal mode Lower corner correction for 50/60Hz 5TC/6TC Set to the optimal mode Trapezoidal correction for 50/60Hz RCUT White balance adjustment Red gun cutoff voltage GCUT White balance adjustment Green gun cutoff voltage RDRV Dark balance adjustment Red gun drive voltage GDRV Dark balance adjustment Green gun drive voltage BDRV 20 Blue gun drive voltage YDFP 8 PAL brightness delay time YDFN 2 NTSC brightness delay time YDFS 2 SECAM brightness delay time

(Continued)

SERVICE MANUAL

RAGC Set to the optimal mode AGC adjustment（19—1E recommended） VOL 29 AV output volume control for TDA7442 WBF 30 WBR 30 SOC 1 PWL clip level（5%） PWL 8 White peak limit IFO 32 IF phase lock PEAK 2 BLS 0 Blue extension BKS 1 Black stretch CON100 23 CON50 0D BRI100 32 BRI50 20 COL100 3F Sub color SHP100 3B SHP50 1C VMDL 03 VM delay VMAM 03 VM amplitude COR 3 WS 0 White stretch setting HDOL 0B Cathode drive level AGCS 1 AGC speed VG2B 24 Brightness setting when adjusting G2 VENH 03 Vertical enhance CBNR 03 Comb noise reduce TRE1 64 TRE2 32 BAS1 64 BAS2 32 VOLA 40/53 MSP3410G/TDA7442 VOLB 46/58 MSP3410G/TDA7442 VOLC 4B/60 MSP3410G/TDA7442 VOLD 51/63 MSP3410G/TDA7442 LOUD 20 Loudness (not for TDA7442) SC1 74 SCART1 PRESCAL (not for TDA7442) SC2 74 SCART2 PRESCAL (not for TDA7442) SCIN 1E SCART IN PRESCAL (not for TDA7442) FMIN 13 FM frequency bias setting (not for TDA7442) NNIN 5A NICAM setting (not for TDA7442)

Sub contrast

Sub brightness

Sub sharpness

Treble linearity

Bass linearity

(Continued)

SERVICE MANUAL

WOCF 1E ( not for TDA7442) MEFF 44 MAMP FF MHAR 64 MLOP 19 MHIP 05

OP1 OP2 20 Option set byte 2

OP3 0C Option set byte 3 OP4 11 Option set byte 4

OP5 88 Option set byte 5 OP6 0F Option set byte 6

OP7 08 Option set byte 7

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. ③ Designs and specifications are subject to change without notice.

Bit Item Description

OP1

OP2

F8 (For PF29T18/34t18 only) D8 (For CPF29T99 only)

Table 3 Option bit setting

0 OP_NICAM 1: MSP3410；0: TDA7442 1 OP_COMB 1: Yes; 0: No 2 OP_SVM 1: Yes; 0: No 3 OP_AV2 1: Yes; 0: No 4 OP_FAV 1: Yes; 0: No 5 OP_FAVS 1: Yes; 0: No

6 OP_STORE 7 OP_OSO 1 0 OP_AVC

1 OP_MDB

4 5 OP_ PARENT 1 (Child lock)

Text setting

MDB setting (not for TDA7442)

Option set byte 1

0: West Europe 1: East Europe

1: MSP3410; 0: TDA7442 1: MSP3410; 0: TDA7442 000: West Europe text 001: East Europe text 010: Ukrainian text 100: Russian text 110: Greek text

(Continued)

SERVICE MANUAL

OP3

OP4

6 OP_TILT Tilt correction 7 OP_FSL 0

1: Black screen available when changing

0 OP_BSCREEN

1 OP_5060 0 2 OP_DK 1: D/K option 3 OP_BG 1: B/G option 4 OP_I 1: I option 5 OP_L 1: L option 6 OP_AUTO_SOUND 1: MSP3410；0: TDA7442 7 OP_EQUAL 1: MSP3410；0: TDA7442 0 OP_FMWS 1

1 OP_POWER 2 OP_COUNTRY 1: COUNTRY display option

3 OP_LOGO 0: LOGO display not available 4 OP_DFL 1

5 OP_BLUE_BACK

6 OP_ACI 1: Yes; 0: No

channels; 0: Black screen not available when changing channels

1: Memory on 0: Soft on

0: Blue back not available under no signal

condition;

1: Blue back available under no signal

condition

OP5

OP6

7 OP_ATS 1: Yes; 0: No 0 OP_LANG0 0

1 OP_LANG1 0 2 OP_LANG2 0 3 OP_LANG3 0 4 OP_SOUND0 0 5 OP_SOUND1 0 6 OP_SOUND2 1 7 OP_STRIKE 1 0 OP_MUTE 1 1 OP_TUNER 1: West Europe 0: BG 2 OP_AFT 1

3 OP_ENGLISH 1 4 OP_FRANCE 1

5 OP_GERMAN 1 6 OP_SPAIN 1 7 OP_DANMARK 1

(Continued)

SERVICE MANUAL

0 OP_HOLAND 1 1 OP_SUOMI 1 2 OP_GREECE 1

OP7

3 OP_ITALY 1 4 OP_NORWAY 1 5 OP_PORTUAL 1 6 OP_SWEDEN 1 7 OP_TURKY 1

Note :

① Bit6, Bit5, Bit4 in OP5 are outgoing audio option settings as follows: 000: East Europe

(D/K); 001: West Europe (B/G); 010: UK (I); 110: France (L); 100: Europe (Auto).

② Bit3, Bit2, Bit1 and Bit0 in OP5 are outgoing language option settings as follows:

English, French, German, Spanish, Danish, Dutch, Finnish, Greek, Italian, Norwegian, Portuguese, Swedish and Turkish successively begun with.

SERVICE MANUAL

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION

1. Structure Block Diagram

V002

amplifier

IF Pre-

Circuit for Buttons

Remote Sensor

Fig.5 Structure Block Diagram for CH-20 Chassis

AT24C16 (N102)

EEPROM

IIC

K9656M (Z002)

SAW Filter

SIF

K3953M (Z003)

(UOC)

TDA9594 (N101)

Microcontroller

Small Signal Processor &

H-out

V-out-

V-out+

TDA8359 (N401)

EHT Circuit

V402,T401

Including

Line Drive

Vertical Output

E-W

Output V404

ABL Circuit

Horizontal

FBT

+200V

+14V

Voltage

Filament

T402

+8V

+12V-2

+5V

+45V

SAW Filter

VIF

TDA6108JF

A001

Tuner

AGC

R/G/B

Video Amplifier

To VM Coil

CRT

IIC

SVM Circuit

73,78

67,68

CTRL SIG

SVM

(N501)

TC90A49

CTRL SIG

AV-CVBS

IFO

TV-CVBS

TDA8944J (N603)

Amplifier

Sound Power

Speakers

Comb Filter

Y/C

Trap

R/L

(N301)

Main

Y/C

HEF4052

Video Switch

R/G/B Input

HEF4052 (N302)

Video Switch

CVBS 2

AV-CVBS

CVBS 1 In

Audio Out

+3.3V

Y/C

+3.9V

S- Video In

SCART Jack 2

V1 Out

AV In

Side

SCART Jack 1

V2 Out

50/60Hz

220-240V AC

(N801)

STR-W6856

Power Circuit

+15V-2

+12V

Audio Out

R/L2 Out

R/L2 In

R/L3 In

R/L1 In

R/L1 Out

+145V

+15V-1

IIC

Audio Processor TDA7442 (N602)

SERVICE MANUAL

2. Block Diagram for Supply Voltage System

Fig.6 Block Diagram for Supply Voltage System for CH-20 Chassis

Circuit N801

Feedback

VD816

+3.9V

VD816

TDA9594 (N101)

UOC

Bus Data

Driver Circuit

LED

Circuit

Hs0038

Remote Sensor

Buttons

Circuit for

VD820

V806

Regulator

+3.3V

AT24C16 (N102)

EEPROM

VD817

+12V-1

Fl501 HFD2-CL2-M

(N801)

STR-W6856

and Control

Power Regulation

Switch Transformer BCK-24339L

VD818

VD815

+15V-1

(N603)

TDA8944J

Amplifier

Circuit

Line Drive

V405

Regulator

TC90A49

Comb Filter

+5V

A001

Tuner

HEF4052

Video Switch

Circuit Including KAV, etc.

Control Signal Driver

+15V-2

Sound Power

lifier V301,V302

V505-V510

Circuit

V303,V304,V310,V311

Video Out Amp-

Y/C Amplifier

ABL & EHT

Audio Out Amplifier

C804,C807,C808

VD801-VD804,C803,

Bridge Rectifier

VD819

+145V

FBT T402

VD410

+12V-2

V808

+8V

TDA9594 (N101)

UOC

TDA7442 (N602)

Audio Processor

V002

IF Amplifier

CRT RGB Board

50/60Hz

220-240V

Circuit

Interference-proof

Filament

Voltage

VD414

VD412

+45V

+200V

TDA6108JF

Video Amplifier

VD003

Regulator

+33V

A001

Tuner

Circuit

Degaussing

VD411

+14V

TDA8359 (N401)

Vertical Output

SERVICE MANUAL

3. Chassis Description

General Description

CH-20 chassis is applied in CPF29T99/PF29T18/34T18, which mainly uses Philips’ advanced

UOC-ultimate one chip TDA959X and I microcontroller and small signal processor, the TDA959X features high-integrity, high-performance-to-price ratio and high-reliability and advanced functions with fewer external components, which provide much more convenience for manufacturing and technical service. In addition, TDA959X is good in geometric distortion, more suitable for pure flat TV sets.

The following features are available in the chassis:

 RF color systems: PAL/SECAM  Video systems: PAL/SECAM/NTSC  Sound systems: D/K B/G I H L L1  100 programs preset

C bus control

 I  Audio output: Main channel: 7W+7W (distortionless) (THD 7%)  Selectable sound modes: Music, Theatre, Speech, Personal  Selectable picture modes: Personal, Rich, Natural, Soft  AV stereo + audio processing (MSP34XX or TDA7442)  PAL/NTSC 3-line comb filter  Earphone output  Selectable aspect ratio: 4:3, 16:9, Zoom  Auto identification and changeover of vertical frequency 50/60Hz  Auto identification of SCART picture input format (4:3,16:9)  Auto identification of SCART1 signal source input (RGB/CVBS)

The chassis mainly uses the following ICs and assemblies.

Table 4 Key ICs and Assemblies

C-bus controlled IC. With combination of

Serial No. Position Type Function Description

1 N101 TDA9594H Microcontroller and small signal processor (UOC) 2 N102 AT24C16 EEPROM 3 N602 TDA7442 Audio processor 4 N603 TDA8944J Sound power amplifier 5 NY01 TDA6107JF /TDA6108JF Video amplifier 6 N501 TC90A49P COMB Filter 7 N301/N302 HEF4052BP Electronic switch circuit 8 N401 TDA8359J Vertical scan output stage circuit 9 N801 STR-W6856 Power module

10 A001 TDQ-6B3-P/ TAF5-EPB2 Tuner

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