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SERVICE MANUAL

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 (150-250V ~, 50Hz) and turn on the TV. Set the brightness and

contrast to minimum (0

A).

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

25KV

1KV 30KV for 25" pure flat CRT only

29KV

1KV 32KV for 25" super pure flat CRT only

28.8KV

1KV 32KV for 29” CRT only

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.

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, 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 degaussing coil to be over 20M

Содержание 25F83

Страница 1: ...FILE NO SM CTV 098 COLOR TELEVISION MODEL NO 25F83 PF25F83 PF29F83 CHASSIS NO CH 16 S Please read this manual carefully before service SERVICE MANUAL ...

Страница 2: ... 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 arou...

Страница 3: ...ront 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 ass...

Страница 4: ...nvergence by Convergence Magnets Incline the Yoke Up or Down Incline the Yoke Right or Left the bus data to adjust white balance Fig 2 4 pole Magnet Movement 6 pole Magnet Movement Circumference Convergence by DEF Yoke Fig 3 7 ...

Страница 5: ...ly 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 ...

Страница 6: ...erent 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...

Страница 7: ...e control function in the S mode but 100 7 8 9 and 0 buttons not 6 2 Bus data Table 3 Bus data Data in S Mode Adjustment Description OP1 7B Option set byte 1 See Table 4 OP2 4C Option set byte 2 See Table 4 OP3 FF Option set byte 3 See Table 4 OP4 F5 Option set byte 4 See Table 4 OP5 36 Option set byte 5 See Table 4 OP6 28 Option set byte 6 See Table 4 AVG Vertical output INIT Initializing E2 PROM...

Страница 8: ...0Hz 6HA displayed 5EW Set to the optimum East west pincushion correction When vertical frequency is identified to 50Hz 5EW is displayed when identified to 60Hz 6EW displayed UCP Set to the optimum Upper corner correction BCP Set to the optimum Bottom corner correction TC Set to the optimum Trapezoidal correction RCUT Set to the optimum Red gun cutoff voltage GCUT Set to the optimum Green gun cutof...

Страница 9: ...L AVL 1 Yes 0 No 1 OP_AUTO_SOUND Auto sound system test 1 Yes 0 No 2 OP_KEY Key 1 Standard 0 Non standard 3 OP_OSO Switch off in vertical overscan 4 OP_NOT_3 National option disabled 5 OP_USER_LOGO User write in logo option prior to Changhong logo 6 OP_ON_BACK Power on auto test background 1 Blue 0 Black OP2 7 OP_FSL Slicing level for vertical sync 0 OP_ENGLISH English 1 OP_FARSI Farsi 2 OP_ARABIC...

Страница 10: ...alian Spanish for example LANG2 LANG1 LANG0 0 0 0 English 0 0 1 Farsi 4 OP_FORF 5 OP_FORS Vertical frequency OP_FORS FORF 00 Auto 60Hz under no signal condition 01 KeepLast 10 Force60Hz 11 Auto 50Hz under no signal condition 6 OP_AV_ON 1 The former mode before power off when power on 0 TV mode when power on OP5 7 OP_HOTEL_ON_PROG Fixed to Channel 1 when power on Activated with OP HOTEL 1 Yes 0 No ...

Страница 11: ... AGC IFFS CL AGCS VOL VG2B SVOL MVOL SBRI MBRI SCON MCON MCOL RCUT GCUT RDRV GDRV BDRV Notes The data sheet may differ dependent on different models The data sheet may differ dependent on different CRTs for the same model Designs and specifications are subject to change without notice 14 ...

Страница 12: ...e V432 H OUT V436 CRT Drive TDA6107Q NY01 Audio Amplifier TDA7057AQ N600 Analog switch HEF4053 N350 Audio Processor TDA9859 N606 SDA SCL CRT Band 1 2 Vt AGC I2 C BUS FBT T400 V OUT R AMP Speaker R Speaker L Power Supply Circuit STR F6454R or STR F6656 N801 145V 16V S 5V 2 3 2V 150 250V AC 50Hz V OUT TDA8350 N400 15V YUV In AV I O 190V 45V 16V 8V 5V 1 Fig 5 Structure Block Diagram 15 ...

Страница 13: ...SERVICE MANUAL 2 Block Diagram for Supply Voltage System Fig 6 Block Diagram for Supply Voltage System 150 250V AC 50Hz 16 ...

Страница 14: ...C SECAM reception Real time clock Child lock Alarm Electronic program guide Auto identification of video signal source Auto identification of color audio system AV input output CCD V CHIP PAL NTSC D COMB HI FI stereo Surround The chassis mainly uses the following ICs and assemblies Table 6 Key ICs and Assemblies Serial No Position Type Function Description 1 N100 TDA9384 CH05T1610 Microcontrollera...

Страница 15: ...ferent FM sound frequencies 4 5 5 5 6 0 6 5 MHz The quality of this system is such that the external band pass filters can be omitted Source selection between internal CVBS and external CVBS or Y C signals Integrated chrominance trap circuit Integrated luminance delay line with adjustable delay time Picture improvement features with peaking with variable centre frequency and positive negative over...

Страница 16: ... or PWM 6 bit output Data Capture Text memory for 0 1 or 10 pages In the 10 page versions inventory of transmitted Teletext pages stored in the Transmitted Page Table TPT and Subtitle Page Table SPT Data Capture for US Closed Caption Data Capture for 525 625 line WST VPS PDC system A and Wide Screen Signalling WSS bit decoding Automatic selection between 525 WST 625 WST Automatic selection between...

Страница 17: ...ned area Contrast reduction of defined area Cursor Special Graphics Characters with two planes allowing four colours per character 32 software redefinable On Screen display characters 4 WST Character sets G0 G2 in single device e g Latin Cyrillic Greek Arabic G1 Mosaic graphics Limited G3 Line drawing characters WST Character sets and Closed Caption Character set in single device Functional Differ...

Страница 18: ...SERVICE MANUAL 3 Black Diagram 7 21 ...

Страница 19: ...SERVICE MANUAL 8 22 ...

Страница 20: ...SERVICE MANUAL 4 Pining 5 Refer to Table 12 about Functions and Data of the IC s Pins 9 23 ...

Страница 21: ...output Y0 and Y1 and the other side connected to a common input output Z With E cted lo LOW one of the two switches is sele w impedance ON state by Sn With E HIGH all switches are in the high impedance OFF state independent of SA to SC VDD and VSS are the supply voltage connections for the digital control inputs SA to SC and E The VDD to VSS range is 3 to 15V The analog inputs outputs Y0 Y1 and Z ...

Страница 22: ... the voltage drop across the switch but the voltages at Y and Z may not exceed VDD or VEE Refer to Table 13 about Functions and Data of the IC s Pins H H 4 HEF4053T D 16 lead S0 plastic SOT109 1 Package Designator North America R L S N 4 Fig 11 Pinning Diagram EF4053P N 16 lead DIL plastic SOT38 1 EF4053D F 16 lead DIL ceramic cerdip SOT7 Y1A to Y1C Independent inputs outputs SA to Sc Select input...

Страница 23: ...ntrol The device is designed for use in TVs and monitors but is also suitable for battery fed portable recorders and radios Missing Current Limiter MCL A MCL protection circuit is built in The MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds 100 mA typical 300 mA This level of 100 mA allows for single ended headphone applications 3 Block...

Страница 24: ... 2 The TDA8356 is a power circuit for use in 9 colour deflection systems for field frequencies of 50 to 120 Hz The circuit provides a DC driven vertical deflection output circuit efficient class G system Block Diagram eatures ighly efficient fully DC coup t bridge circuit Vertical flyback Guard circuit Protection against Short circuit of the output pins 7 and emperature protection e inputs 0 and 1...

Страница 25: ... bias Idrive neg 2 Input power stage negative includes II sb signal bias VP 3 Operating supply voltage VO B 4 Output voltage B GND 5 Ground VFB 6 Input flyback supply voltage VO A 7 Output voltage A VO guard 8 Guard output voltage VI fb 9 Input feedback voltage 5 Refer to Table 15 about Functions and Data of the IC s Pins 28 ...

Страница 26: ...stereo and pseudo stereo effects Audio surround decoder can be added externally Two general purpose logic output ports I2 C bus control of all functions 2 General Description The TDA9859 provides control facilities for the main and the SCART channel of a TV set Due to extended switching possibilities signals from three stereo sources can be handled 3 Block Diagram 4 Refer to Table 16 about Functio...

Страница 27: ...in overmolded SIP style package affording dielectric isolation without compromising thermal characteristics 1 Features Flyback Operation with Quasi Resonant Soft Switching for Low Power Dissipation and EMI Rugged Avalanche Rated MOSFET Soft drive circuit MOSFET Adjustable MOSFET switching speed Choice of MOSFET Voltage and rDS on Full Over Current Protection no blanking Under Voltage Lockout with ...

Страница 28: ...SERVICE MANUAL 2 Circuit Block Diagram Dwg MK 003 50mm Fig 18 Fig 17 3 Pin Configuration and Functions 31 ...

Страница 29: ...ction for STR F6454R F6656 Symbol Function Description 1 OCP FB Over current protection detection signal voltage limiting signal input 2 S MOSFET source 3 D MOSFET drain 4 VIN Supply voltage input for control circuit 5 GND Ground 32 ...

Страница 30: ...ction 2 General Description The TDA6107Q 6108JF includes three video ent SIL 9 pin medium power DBS9MPF package SOT 111 1 using high voltage DMOS technology nded to drive the three cathodes of a colour CRT directly To obtain maximum performance the amplifier should be used with black current control 3 Ordering Information Table 10 Package F or 5 5MHz for TDA6107Q output amplifiers in one plastic D...

Страница 31: ...2 Inverting input 2 Vi 3 3 Inverting input 3 GND 4 ground fin Iom 5 Black current measurement output VDD 6 Supply voltage Voc 3 7 Cathode output 3 Voc 2 8 Cathode output 2 Voc 1 20 Pin Co 5 Refer to Table 17 about Functions and Data of the IC s Pins Fig nfiguration 9 Cathode output 1 34 ...

Страница 32: ...tered inputs for noise suppression with Schmitt trigger Clock frequency up to 400 kHz High programming flexibility Internal programming voltage Self timed programming cycle including erase Byte write and page write programming between 1 and 16 bytes Typical programming time 6 ms 10 ms for up to 16 bytes Endurance 106 cycles1 Data retention 40 years1 ESD protection 4000 V on all pins 8 pin DIP DSO ...

Страница 33: ...ltage VI 3 Voltage input GND1 4 Signal ground VC 5 DC volume control OUT ositive output 6 P GND2 7 Power ground OUT 8 Negative output n c 9 Not connected Fig 24 Pin Configuration 2 General Description 6B i Load BTL output amplifier with DC volume control for use in TV and monitors but is also suitable for battery fed portable recorders and radios is contained in a 9 pin medium power package rrent ...

Страница 34: ...n ion Being Symmetric TA75558S z Typ Suitable Application for Active Filter Equalizer Amplifier and Headphone Amplifier Fig 25 Fig 26 3 Refer to Table 20 about Functions and Service Data of the IC s Pins Operational Amplifier 1 Features C Internal Frequency Pin Compatible with TA75558P TA75558S and Possible to Exchang Because of Pin Connect Device Only Wide Band Range fT 3MH 2 n Connection top vie...

Страница 35: ...SERVICE MANUAL 2 Waveforms of Key Points 38 2 TDA938X PIN5 3 TDA938X PIN7 4 TDA938X PIN8 5 TDA938X PIN22 6 TDA938X PIN26 1 TDA938X PIN4 ...

Страница 36: ...SERVICE MANUAL 7 TDA938X PIN31 8 TDA938X PIN33 TDA938X PIN34 10 TDA938X PIN38 11 TDA938X PIN40 12 TDA938X PIN42 9 39 ...

Страница 37: ...RVICE MANUAL 13 TDA938X PIN44 14 TDA938X PIN49 Flyback Pulse 17 Waveform of Line Drive Voltage 18 Waveform of Horizontal Scan Current 19 Waveform of Vertical Scan Current 15 TDA938X PIN58 16 Horizontal 40 ...

Страница 38: ...9 02 36 13 5 P3 0 ADC0 PWM0 0 17 1 6 1 63 6 P3 1 ADC1 PWM1 0 1 4 87 4 87 7 P3 2 ADC2 PWM2 0 02 7 55 7 57 8 P3 3 ADC3 PWM3 0 02 7 54 7 55 9 VSSC P 0 0 0 10 P0 5 0 02 4 88 4 9 11 P0 6 3 06 5 05 5 07 12 VSSA 0 0 0 13 SECPLL 2 29 21 46 27 35 14 VP2 7 86 1 27 1 29 15 DECDIG 4 99 16 2 23 33 16 PH2LF 3 43 21 01 27 32 17 PH1LF 3 9 21 33 27 58 18 GND3 0 0 0 19 DECBG 3 99 18 75 24 58 20 AVL EWD 1 0 74 20 36...

Страница 39: ...7 46 36 AUDEXT 1 98 8 48 8 66 37 QSSO AMOUT 1 2 44 21 48 1 98 38 AUDEXT 2 87 21 62 23 98 39 QSSO AMOUT 1 7 86 1 26 1 31 40 AUDEXT 3 66 21 24 27 2 41 GND1 0 0 0 42 CVBS Y 3 76 21 12 27 2 43 CHROMA 1 83 1 26 67 48 44 AUDOUT AMOUT 1 3 56 21 97 27 71 45 INSSW2 1 68 19 35 22 46 46 R2 VIN 2 54 21 7 1 83 47 G2 YIN 2 54 21 76 1 83 48 B2 UIN 2 54 21 76 1 83 49 BCLIN 2 21 76 27 1 71 50 BLKIN 3 19 20 81 21 2...

Страница 40: ... 4 Signal output 2 5 0 0 5 Table 13 Functions and Service Data of HEF4053 N350 s Pins Digital Multime Victor DT890D Pin No ription Reference Voltage Positive Resistance Negative Resistance Signal input 2 4 6 Ground 0 0 0 7 Ground 0 0 0 8 Ground 0 0 0 9 Control signal input 0 03 13 5 13 1 10 Control signal input 0 03 13 5 13 1 11 Control signal input 0 03 13 5 13 1 12 Signal input 3 9 22 2 47 0 13 ...

Страница 41: ... ch outpu annel in phase signal t 7 35 18 74 21 49 0 0 0 7 18 4 21 47 ght channe tput 2 0 0 ight channe tput Voltag KΩ KΩ 1 Idr 4 ive pos 2 27 7 20 3 2 Idr 4 ive neg 2 27 7 20 4 P 5 GND 0 0 0 6 V 0 3 FB 45 113 13 7 7 V 5 1 O A 7 6 6 1 9 Ground 0 1 Left channel inverting signal output 39 7 11 Ri l inverting signal ou 7 39 18 47 21 47 1 Ground 0 13 R l in phase signal ou 7 4 16 47 21 46 Table 15 Fun...

Страница 42: ...24 27 19 8 Ground 0 0 0 9 Audio output 3 85 19 93 26 27 10 Audio input 8 3 85 19 93 26 31 11 Channel 1 audio ation 3 85 20 67 25 854 compens 12 Channel 2 audio compensation 3 85 21 45 27 59 KΩ 4 ge for filtering 7 63 7 39 13 Audio output 8 0 01 14 Treble compensation 3 84 22 31 27 01 15 2 9 58 6 64 7 Serial data line 8 54 62 9 Treble compensati 0 Audio output 1 Bass2 compensation 5 44 7 55 3 Audio...

Страница 43: ...C 200 s Pins Digital Multimeter ice 08 N Function V 20KΩ 20KΩ 2 Address input 0 0 0 3 Address input 4 93 3 18 3 2 4 Common ground 0 0 0 6 Data line 3 42 6 56 6 64 7 PW write protect 0 20 78 Pin No Function Description Reference Voltage V Positive Resistance 20KΩ Negative Resistance 20KΩ 1 G inverting input 3 33 5 32 4 72 2 R inverting input 3 26 5 32 4 72 3 B inverting input 3 28 5 32 4 72 5 Black...

Страница 44: ...ve outpu 8 6 7 4 Pin Description Reference Voltage V Positive Resistance 20KΩ Negative Resistance 20KΩ 3 Voltage input 2 7 4 33 6 Positive put 75558 NW02 s Pin No N Function Description Reference Voltage V Positive Resistance 20KΩ egative Resistance 20KΩ 2 A negative input 3 7 7 5 57 3 A positive input 3 7 0 8 0 8 4 Ground 0 0 0 5 B positive input 3 7 0 8 0 8 6 B negative input 3 2 7 5 80 7 B 5 6 ...

Страница 45: ...acteristics AE The components identified by the AE marking are listed by EMC and have special saf CB The components identified by the CB marking have been evaluated to the CB standard The components identified by the E marking are liste G The components identified by v t is Z mponents identified by the Z m ing have importa haracteristics EMENT OF PARTS De tion c aracteristics Compon is m a d its s...

Страница 46: ...CIRCUIT DIAGRAM JUC 820 975 JUC 820 591 JUC 820 725 JUC 820 644 APPENDIX ...

Страница 47: ...Circuit Diagram for CRT RGB PCB of 25F83 PF25F83 ...

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