1. Manuals
  2. Brands
  3. SITRONICS Manuals
  4. TV
  5. 25F83
  6. Service manual

SITRONICS 25F83 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
FILE NO. SM-CTV-098
COLOR TELEVISION

SERVICE MANUAL

MODEL NO. 25F83/PF25F83/PF29F83
CHASSIS NO. CH-16(S)
Please read this manual carefully before service.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 25F83 and is the answer not in the manual?

Questions and answers

Related Manuals for SITRONICS 25F83

Summary of Contents for SITRONICS 25F83

  • Page 1: Service Manual

    FILE NO. SM-CTV-098 COLOR TELEVISION SERVICE MANUAL MODEL NO. 25F83/PF25F83/PF29F83 CHASSIS NO. CH-16(S) Please read this manual carefully before service.

  • Page 2: Set-Up Adjustments

    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...
  • Page 3 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 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.
  • Page 4 SERVICE MANUAL the bus data to adjust white balance. 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...

  • Page 5: Circuit Adjustments

    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 I C bus control, first change the bus data. 1.
  • Page 6 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.
  • Page 7 SERVICE MANUAL 6. SERVICE mode 6.1 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.
  • Page 8 SERVICE MANUAL Set to the optimum S correction Vertical shift (When vertical frequency is identified to 50Hz, “5VSH” is displayed ； when identified to 60Hz, “6VSH” Set to the optimum displayed.) Character field starting position (When vertical frequency is Set to the optimum identified to 50Hz, “5OV”...
  • Page 9 SERVICE MANUAL SCON Sub contrast MCON Contrast Max. MCOL Color Max. Table 4 Option bit setting Item Description OP_HOTEL Hotel Mode: 1: Yes, 0: No OP_HWSN Audio processor: 1: TDA9859, 0: No OP_SUPERWOOFER Super woofer: 1: Yes, 0: No OP_NTSC NTSC option: 1: Yes, 0: No OP_AV2 1: With AV2;...
  • Page 10 SERVICE MANUAL OP_DIRECT_SWITCH_ Memory on: 1: Remote on if remote off; instant on if AC off 0: Soft on OP_HCO EHT: EW control 1:On 0: Off Changhong logo display OP_CHH_LOGO 1: Yes under no signal condition；0: No OP_SOUND_DK Audio system DK option: 1: Yes, 0: No OP_SOUND_BG Audio system BG option: 1: Yes, 0: No OP_SOUND_I...
  • Page 11 SERVICE MANUAL Table 5 TAB data check sheet VX00 YD(FP/FN/FS/AV) IFFS AGCS VG2B SVOL MVOL SBRI MBRI SCON MCON MCOL RCUT GCUT RDRV GDRV BDRV 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...

  • Page 12: Structure And Chassis Function Description

    SERVICE MANUAL STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 1. Structure Block Diagram IF Pre- From Amplifier Antenna Tuner A100 YUV In SAWF AV I/O Analog switch HEF4053 (N350) Band 1, 2 Vt, AGC C BUS EEPROM Drive TDA6107Q TDA9384/CH05T1610 (N100) AT24C08 (NY01) (N200) V.OUT...

  • Page 13: Block Diagram For Supply Voltage System

    SERVICE MANUAL 2. Block Diagram for Supply Voltage System...

  • Page 14: Chassis Description

    SERVICE MANUAL 3. Chassis Description General Description CH-16(S) chassis is applied in 25F83/PF2583/PF29F83, which mainly uses Philips’ advanced UOC-ultimate one chip TDA938X and I C-bus controlled IC. With combination of microcontroller small signal processor, TDA938X 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.

  • Page 15: Service Data

    SERVICE MANUAL SERVICE DATA 1. Technical Data of Key ICs 1.1 Microcontroller and Small Signal Processor TDA935X/6X/8X (1) General Description The various versions of the TDA935X/6X/8X PS/N2 series combine the functions of a TV signal processor together with a μ-Controller and US Closed Caption decoder. Most versions have a Teletext decoder on board.
  • Page 16 SERVICE MANUAL ・Horizontal and vertical geometry processing ・Horizontal and vertical zoom function for 16:9 applications ・Horizontal parallelogram and bow correction for large screen picture tubes ・Low-power start-up of the horizontal drive circuit µ-Controller ・80C51 µ-controller core standard instruction set and timing ・1 µs machine cycle ・16 - 128Kx8-bit late programmed ROM ・3 - 12Kx8-bit DATA RAM (shared between Display, Acquisition and Auxiliary Ram)
  • Page 17 SERVICE MANUAL ・Scrolling of display region ・Variable flash rate controlled by software ・Enhanced display features including overlining, underlining and italics ・Soft colors using CLUT with 4096 color palette ・Globally selectable scan lines per row (9/10/13/16) and character matrix [12x10, 12x13, 12x16 (VxH) ] ・Fringing (Shadow) selectable from N-S-E-W direction ・Fringe color selectable...
  • Page 18 SERVICE MANUAL (3) Black Diagram...
  • Page 19 SERVICE MANUAL...
  • Page 20 SERVICE MANUAL (4) Pining (5) Refer to Table 12 about Functions and Data of the IC’s Pins.
  • Page 21 SERVICE MANUAL 1.2 Triple 2-Channel Analog Multiplexer/Demultiplexer HEF4053 (1) Description With ( ) LOW, one of the two switches is The HEF4053 is a triple 2-channel analog sele cted (lo w impedance ON-state) by Sn. multiplexer/demultiplexer with common With HIGH, all switches are in the high enable input Each...
  • Page 22 SERVICE MANUAL Pinning Y0A to Y0C Independent inputs/outputs to Y Independent inputs/outputs to Sc Select inputs Enable input (active LOW) Fig. 11 Pinning Diagram to Z Common inputs/outputs (3) Function Table Inputs Channel EF4053P(N): 16-lead DIL; plastic (SOT38-1) EF4053D(F): 16-lead DIL; ceramic (cerdip) none (SOT7 Notes...
  • Page 23 SERVICE MANUAL 1.3 2×8W Stereo BTL Audio Output Amplifier with DC Volume Control TDA7057AQ (1) Features (2) General Description ・DC volume control The TDA7057AQ is a stereo BTL output amplifier ・Few external components with DC volume control. The device is designed ・Mute mode for use in TVs and monitors, but is also suitable for ・Therm...
  • Page 24 SERVICE MANUAL 1.4 DC- coupled Vertical Deflection circuit TDA8356/N6 (1) F eatures ・Few external components ・H ighly efficient fully DC-coup led vertical outpu t bridge circuit ・ Vertical flyback switch ・ Guard circuit ・ Protection against: Short-circuit of the output pins (7 and Short-circuit of the output pins to Vp ・T emperature protection...
  • Page 25 SERVICE MANUAL (4) Pinning Fig.15 Table 8 Symbol Description Input power-stage (positive); includes II signal bias drive(pos) (sb) Input power-stage (negative); includes II signal bias drive(neg) (sb) Operating supply voltage Output voltage B O(B) Ground Input flyback supply voltage Output voltage A O(A) Guard output voltage O(guard)
  • Page 26 SERVICE MANUAL 1.5 Universal Hi-Fi Audio Processor for TV TDA9859 ・Audio surround decoder can be added (1) Features externally ・Multi-source selector switches six AF ・Two general purpose logic output ports inputs (three stereo sources or six mono ・I C-bus control of all functions. sources) (2) General Description ・Each of the input signals can be switched...
  • Page 27 SERVICE MANUAL 1.6 Switch-mode Power Supply STR- F6454R/F6656 he Series STR- F6454R/F6654 is specifically designe d to satisfy the requirements for increase tegration and reliability in off-line quasi-r esonant fly back converte rs. The series incorporates a high -precise error amplifying control and d rive circuit with discrete avalanche-rated power MOSFET, featuring fewer external components, small-size and standard power supply.
  • Page 28 SERVICE MANUAL (2) Circuit Block Diagram Fig. 17 (3) Pin Configuration and Functions Dwg MK-003-50mm Fig. 18...
  • Page 29 SERVICE MANUAL Table 9 Pin Function for STR-F6454R/F6656 Symbol Function Description OCP/FB Over-current protection detection signal/ voltage-limiting signal input MOSFET source MOSFET drain Supply voltage input for control circuit Ground...
  • Page 30 SERVICE MANUAL 1.7 Triple Video Output Amplifier TDA6108JF/6107Q (1) Features (2) General Description Typical bandwidth 9.0MHz (for The TDA6107Q/6108JF includes three video TDA6108J F) or 5.5MHz (for TDA6107Q) output amplifiers in one plastic DIL-b ent-SIL for an output signal of 60 V (peak-to-pea 9-pin medium power (DBS9MPF) package (SOT value)
  • Page 31 SERVICE MANUAL Table 11 Pinning Symbol Description Inverting input 1 i(1) Inverting input 2 i(2) Inverting input 3 i(3) ground (fin) Black-current measurement output Supply voltage Cathode output 3 oc(3) Cathode output 2 oc(2) . 20 Pin Co nfiguration. Cathode output 1 oc(1) (5) Refer to Table 17 about Functions and Data of the IC’s Pins.
  • Page 32 SERVICE MANUAL .8 EEPROM AT24C08 (1) Features ・Data EEPROM internally organized as 1024/2048 (2) Pin Configuration bytes and 64/128 pages×16 bytes ・ Page rotection mode, flexible page-b page hardware write protection - Additional protection EEPROM of 64/128 bits, 1 bit per data page - Protection setting for each data page by writing its protection bit...
  • Page 33 SERVICE MANUAL 1.9 5 W Mono BTL A udio Amplifier with DC Volume Control TDA7056B (1) Features (2) General Description · D C volume control The TDA705 6B i s a mono Bridge-Tied Load (BTL) · Few external components output amplifier with DC volume control. ·...
  • Page 34 SERVICE MANUAL 1.10 Dual Operational Amplifier TA75558P The TA75558P, TA75558S and TA75558F are Low-Noise Operational Amplifier s with High Speed and Wide Bandwidth. (1) Features · Internal Frequency ompensation Type · Pin Compatible with TA75558P, TA75558S and TA75558F · Possible to Exchang e the Position of 9 Pin for 1 Pin Because of Pin Connect ion Being Symmetric.

  • Page 35: Waveforms Of Key Points

    SERVICE MANUAL 2. Waveforms of Key Points 1-TDA938X-PIN4 2-TDA938X-PIN5 3-TDA938X-PIN7 4-TDA938X-PIN8 5-TDA938X-PIN22 6-TDA938X-PIN26...
  • Page 36 SERVICE MANUAL 7-TDA938X-PIN31 8-TDA938X-PIN33 -TDA938X-PIN34 10-TDA938X-PIN38 11-TDA938X-PIN40 12-TDA938X-PIN42...
  • Page 37 SERVICE MANUAL 13-TDA938X-PIN44 14-TDA938X-PIN49 15-TDA938X-PIN58 16-Horizontal Flyback Pulse 17-Waveform of Line Drive Voltage 18-Waveform of Horizontal Scan Current 19-Waveform of Vertical Scan Current...

  • Page 38: Service Da Ta Of Key Ics

    SERVICE MANUAL 3. Service Da ta of Key ICs Table 12 Functions and Service Data of TDA9384 (N100)’s Pins Digital Multimeter： Victor DT890D Function Description Reference Voltage Positive Resistance Negative Resistance Pin No. (KΩ) (KΩ) P1.3/T1 4.33 6.63 P1.6/SCL 2.87 6.58 6.64 P1.7/SDA...
  • Page 39 SERVICE MANUAL AUDEEM/SIFIN1(1) AUDEEM/SIFIN1(1) 3.77 3.77 21.42 21.42 27.44 27.44 DECSDEM/SIFIN2(1) 3.96 8.25 GND2 20.45 26.76 VSSA 2.42 21.54 27.5 SECPLL SNDPLL/SIFAGC(1) 2.42 21.8 27.58 AVL/SNDIF/REF0/AMOUT(1) 0.13 20.2 26.23 HOUT 16.08 24.39 FBISO 0.73 20.3 26.33 AUDEXT/QSSO/AMOUT(1) 3.72 22.04 27.46 AUDEXT/ 1.98 8.48...
  • Page 40 SERVICE MANUAL OSCGND XTALIN 16.83 31.63 XTALOUT 1.67 16.73 27.8 RESET VDDP 0.62 0.63 P1.0/INT1 0.03 13.12 13.47 P1.1/T0 0.03 13.15 13.62 P1.2/INT0 4.69 16.45 19.94 Table 13 Functions and Service Data of HEF4053 (N350 )’s Pins Digital Multime ter： Victor DT890D Function Desc ription...
  • Page 41 SERVICE MANUAL Table 1 4 Functions and Service Data of TDA7057AQ (N600)’s Pins Digital Multimeter Functi on Description erenc e Voltage Positive Resistance Negati ve Resi stance Pin No. (20KΩ) 0KΩ Volume control input 7.05 7.05 ∞ ∞ Not connected Audio R signal input 23.54 54.61...
  • Page 42 SERVICE MANUAL Table 16 Functions and Service Data of TDA9859(N606 )’s Pins Digital Multimeter: Victor DT890D nction Description ference Voltage ositive Resistance egative Resistance Pin No. (KΩ) (KΩ) Audio input 7.75 Output 1 0.19 Audio input 0.46 27.73 Reference volta ge for filtering 7.63 7.39...
  • Page 43 SERVICE MANUAL Mode address selection Audio output 3.85 21.24 27.1 Audio compensation 1 3.84 12.29 27.84 Audio input 7.64 1.31 Audio compensation 1 3.84 22.32 27.4 Audio input 3.84 20.45 28.58 Output 2 4.55 7.54 7.54 Audio input 3.84 20.52 27.56 able 17 Functions and Service Data of TDA6107Q/TDA6108JF (NY01)’s Pins...
  • Page 44 SERVICE MANUAL Table 19 Functions and Servic ata of TD7056B (NW01)’s Pins Digital Multimeter Function Description Reference Voltage (V) Positive Resistance (20KΩ) Negative Resistance (20KΩ) Not connected ∞ ∞ Positive supply voltage Voltage input Signal ground DC volume control Positive ower grou egative outpu Not connected...

  • Page 45: Replacement Of Parts

    SERVICE MANUAL REPLAC EMENT OF PARTS . De scrip tion Many electrical and mechanical components in this chassis have special safety-related c aracteristics. Compon ents which have these special safety characteristics in th is m anual a d its supplem ents are identified by the international hazard symbols or UL, FCC, FDA or V E marking on the circuit diagram and parts list.
  • Page 46 APPENDIX DIAGRAM CIRCUIT JUC.820.644 JUC.820.725 JUC.820.591 JUC.820.975...
  • Page 47 Circuit Diagram for CRT RGB PCB of 25F83/PF25F83...

This manual is also suitable for:

Pf25f83Pf29f83

Table of Contents