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CP-850FX Service Manual

Europe R&D

71

5.10.4 OCP/BD Terminal (Pin 7)

The functions of OCP/BD terminal are categorized as Overcurrent Protection (OCP), Bottom-
Skip, and Quasi-Resonant Operation control. Refer to item No. 8.5 for Bottom-Skip and Quasi-
Resonant operation.

8.4.1. Minus-Detection Type OCP Circuit

The OCP of the STR-W6700 series is pulse-by-pulse
type Overcurrent protection circuit, which detects the
peak value of the MOSFET drain current per pulse and
reverses oscillator output. As shown in Fig.14,
overcurrent detecting resistors, R5, R4, and C5 are
mounted externally. R4 and C5 construct the filter
circuit that prevents malfunctions caused by the surge
current generating at the MOSFET Turn-ON. As the
Overcurrent Protection Circuit operation (OCP), it turns
OFF the MOSFET at that time when OCP/BD terminal
threshold voltage reaches VOCPBD(LIM) by the
voltage generated at the overcurrent detecting resistor
R5 after the switching current flows at the MOSFET ON.

The threshold voltage VOCPBD(LIM) of the OCP/BD terminal is set at –0.95V (Typ). The OCP
circuit adopts the minus-detection circuit, which provides the detecting voltage VOCPM in the
MIC by dividing the voltage (between V1 and R5) with RB1, RB2, and R4. Since the RB1 and
RB2 are resistors incorporated in the HIC, taking the distributions of RB1 and RB2 (regulated as
IOCPBD in the specs) into consideration, the value of R4 is to be between 100 to 330 Ohms in
order to lower the influence from the distributions between RB1 and RB2.

Fig.14. Minus-Detection OCP
Circuit

D

S/GND

OCP/BD

33

P

R5

［

RO

C

P

］

11

77

＋

－

LOG IC

LOG IC

DRIVE

DRIVE

Filter

R4

RB1

RB2

Reg.V1

OCP

C5

V

OCPM

V4

V5

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Содержание DTF-2950-100D

Страница 1: ...rformance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center S M No TCP850XEF0 CHASSIS CP 850FX MODEL DTF 2...

Страница 2: ...VERTICAL GEOMETRY 16 3 4 6 HORIZONTAL PICTURE CENTRING 16 3 4 7 EAST WEST CORRECTION 16 3 4 8 AGC 17 4 IC DESCRIPTION 18 4 1 TELETEXT DECODER WITH EMBEDDED 8 BIT CONTROLLER 18 4 1 1 BLOCK DIAGRAM OF T...

Страница 3: ...SECTION 46 5 3 1 BLOCK DIAGRAM 46 5 3 2 VISION IF AMPLIFIER 47 5 3 3 TUNER AND VIF AGC 47 5 3 4 FPLL VCO AND AFC 47 5 3 5 VIDEO DEMODULATION AND AMPLIFIER 48 5 3 6 SOUND IF AMPLIFIER AND SIF AGC 48 5...

Страница 4: ...16 9 CRT 57 5 3 1 8 2 4 3 CRT 58 5 5 7 EXTERNAL SOURCE CONTROL LOGIC 59 5 5 8 OVER CURRENT PROTECTION 60 5 6 TELETEXT DISPLAY 60 5 7 SOUND PROCESSING 61 5 7 1 ANALOGUE SOUND IF INPUT SECTION 61 5 7 2...

Страница 5: ...5 2 Bottom Skip Operation Switching from Quasi Resonant Operation 73 1 Quasi Resonant Operation Bottom Skip Operation 73 2 Bottom Skip Operation Quasi Resonant Operation 73 5 10 6 Stand By Operation 7...

Страница 6: ...CP 850FX Service Manual Europe R D 5 DOCUMENT HISTORY VERSION DATE COMMENTS V1 00 31 07 06 Creation of document Author JS KIM for project CP 850FX 100Hz TV Downloaded From TV Manual com Manuals...

Страница 7: ...splay Program Selection 100 programmes Aux terminal EURO SCART 1 Audio Video In and Out R G B In Slow and Fast switching EURO SCART 2 Audio Video In and Out SVHS In AV3 Audio Video Jack on side of cab...

Страница 8: ...on Matching value 1 Audio Output Right 0 5 Vrms Impedance 1 k RF 54 Mod 2 Audio Input Right 0 5 Vrms Impedance 10 k 3 Audio Output Left 0 5 Vrms Impedance 1 k RF 54 Mod 4 Audio Earth 5 Earth 6 Audio I...

Страница 9: ...1 25 C22 479 25 479 25 479 25 479 25 C23 487 25 487 25 487 25 487 25 C24 495 25 495 25 495 25 495 25 C25 503 25 503 25 503 25 503 25 C26 511 25 511 25 511 25 511 25 C27 519 25 519 25 519 25 519 25 C28...

Страница 10: ...25 823 25 C66 831 25 831 25 831 25 831 25 C67 839 25 839 25 839 25 839 25 C68 847 25 847 25 847 25 847 25 C69 855 25 855 25 855 25 855 25 C70 863 25 863 25 863 25 863 25 C71 69 25 C72 76 25 C73 83 25...

Страница 11: ...25 351 25 S28 359 25 359 25 359 25 359 25 S29 367 25 367 25 367 25 367 25 S30 375 25 375 25 375 25 375 25 S31 383 25 383 25 383 25 383 25 S32 391 25 391 25 391 25 391 25 S33 399 25 399 25 399 25 399 2...

Страница 12: ...then sorted in 4 groups Group I It contains all the programs from the selected country and named by the TV controlling software Within this group the sorting order is fixed by the ATSS list Group II...

Страница 13: ...eeps all TV bands with Europe system selected negative video modulation and then a second time with France system selected positive video modulation Special case GB Note for satellite receiver users B...

Страница 14: ...oltage equipment Discharge the high potential of the picture tube before handling the tube The picture tube is highly evacuated and if broken glass fragments will be violently expelled If any Fuse in...

Страница 15: ...tem Default setting Note All settings are approximate 1 HOR CEN 154 2 RED GAIN 412 3 GRN GAIN 363 4 BLUE GAIN 380 5 RED BIAS 226 6 GRN BIAS 210 7 AGC LEVEL 56 8 G2 SCREEN 32 9 AFT 32 10 AVL OFF 11 OPT...

Страница 16: ...Remote control AVL control ON PICTURE TILT OFF Program list disabled See table below 3 3 3 OPTION 3 B7 B6 B5 B4 B3 B2 B1 B0 1 Local keyboard 6 keys OSD display AV in extern mode AV3 Enabled Full ATSS...

Страница 17: ...ark picture and adjust RED BIAS and GRN BIAS to the desired colour temperature Select a bright picture and adjust RED GRN and BLUE GAIN to the desired colour temperature 3 4 4 FOCUS Adjust the Focus v...

Страница 18: ...he chassis See above how to change option bits Adjust the antenna signal level at 62 dB V 1 Tune a colour bar pattern Find the AGC item in service mode Press the key OK on the remote keypad and wait u...

Страница 19: ...troller has been enhanced to provide powerful features such as memory banking data pointers and additional interrupts etc The on chip display unit for displaying Level 1 5 teletext data is also used f...

Страница 20: ...IN CYRILLIC GREEK 4 1 4 PINNING PSDIP 52 pin Pin Name Type Short Description 1 SCL IN OUT Software driven I2C bus Clock line 2 SDA IN OUT Software driven I2C bus Data line 3 S SW2 IN Slow switching co...

Страница 21: ...ier 35 XTAL1 IN Input of the inverting oscillator amplifier 36 VSSA IN Ground for analog components 37 VDDA2 5 IN Supply voltage for analog components 38 R OUT OUT Red output 39 G OUT OUT Green output...

Страница 22: ...x5B version C4 OPTIMUS Color Decoder and Scan Rate Converter The VSPB family supports 15 32kHz systems and is available with different options VSP 94x5B has one channel only 4 2 1 BLOCK DIAGRAM OF THE...

Страница 23: ...s 3 0 75 z 5 zone horizontal panorama generator Vertical scaling of the 2f H signal z Vertical scaling factors 8 0 92 z 5 zone vertical panorama generator Detection circuits z Global motion and global...

Страница 24: ...or digital 1 8V digital 6 SDA I O I2C Bus data 7 TMS I Testmode select Connected to vdd33 8 656VIN BLANK I O Separate V input for 656 BLANK output 9 656CLK I O Digital input output clock 10 656IO7 I O...

Страница 25: ...put 53 CVBS2 I CVBS input Analog input 54 CVBS3 I CVBS input Analog input 55 CVBS4 I CVBS input or Y1 Analog input 56 CVBS5 I CVBS input or C1 Analog input 57 CVBS6 I CVBS input or Y2 Analog input 58...

Страница 26: ...as well as nonlinear horizontal scaling panorama vision dynamic black level expander luma sharpness enhancement by dynamic peaking and luma transient improvement LTI color transient improvement CTI pr...

Страница 27: ...y for any amplitude characteristic High speed10 bit D A converters are used to convert digital RGB to analog signals Separate 9 bit D A converters control brightness and cutoff For picture tubes equip...

Страница 28: ...C Tilt output 22 PWMV O I2 C controlled DAC 23 HOUT O Horizontal drive output 24 VSTBY S Standby supply voltage Hout generation 25 DFVBL O Dynamic focus blanking horizontal DAF pulse 26 HSYNC O Horizo...

Страница 29: ...nd 59 HCS I Half Contrast 60 NC 61 TEST I 62 RESQ I Reset Input active low 63 SCL I O I2 C Bus clock 64 SDA I O I2 C Bus data 65 C0 I Picture Bus Chroma LSB 66 C1 I Picture Bus Chroma 67 C2 I Picture...

Страница 30: ...cise bit error rate indication Automatic switching from NICAM to FM AM or vice versa Improved NICAM synchronisation algorithm Improved carrier mute algorithm Improved AM demodulation Reduction of nece...

Страница 31: ...added to the already existing FM AM channel The sound coding follows the format of the so called Near Instantaneous Companding System NICAM 728 Transmission is performed using Differential Quadrature...

Страница 32: ...Connected 3 NC Not Connected 4 INT Out Interrupt out 5 MUTE Out Mute out 6 ADR_SEL In I2C bus Address select 7 STANDBYQ In Standby Low active 8 NC Not Connected 9 I2C_CL In Out I2C Clock 10 I2C_DA In...

Страница 33: ...V 40 CAPL_M Volume capacitor MAIN 41 AHVSS Analog ground 42 AGNDC Analog reference voltage high voltage part 43 NC Not Connected 44 NC Not Connected 45 NC Not Connected 46 SC3_IN_L In Scart input 3 in...

Страница 34: ...r positive modulation peak white black level detector Tuner AGC with adjustable take over point Alignment free quasi parallel sound QPS mixer for FM NICAM sound IF signals Intercarrier output signal i...

Страница 35: ...CP 850FX Service Manual Europe R D 34 4 5 4 BLOCK DIAGRAM Downloaded From TV Manual com Manuals...

Страница 36: ...eo products 4 6 1 FEATURES Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected t...

Страница 37: ...CP 850FX Service Manual Europe R D 36 Block diagram TDA8946J Downloaded From TV Manual com Manuals...

Страница 38: ...le positive supply voltages The east west output stage is able to supply the sink current for a diode modulator circuit The IC is constructed in a Low Voltage DMOS LVDMOS process that combines Bipolar...

Страница 39: ...CP 850FX Service Manual Europe R D 38 Downloaded From TV Manual com Manuals...

Страница 40: ...l bandwidth of 9 0 MHz for an output signal of 60 Vpp High slew rate of 1850V s No external components required Very simple application Single supply voltage of 200V Internal reference voltage of 2 5...

Страница 41: ...Serial clock 7 WC Write control 8 Vcc Supply voltage 4 Vss Ground The memory device is compatible with the I2C memory standard This is a two wire serial interface that uses a bi directional data bus a...

Страница 42: ...d Soft Start Operation is provided at the SMPS start up Switching noise is reduced by Step Drive Function Avalanche energy of the MOSFET is guaranteed Overcurrent Protection OCP Overvoltage Protection...

Страница 43: ...o Symbols Terminal Descriptions Functions 1 D Drain Terminal MOSFET Drain 2 3 S GND Source Grand Terminal MOSFET Source and Ground 4 VCC Power Supply Terminal Control Circuit Power Supply Input 5 SS O...

Страница 44: ...V Quasi Resonant Operation Threshold Voltage 2 7 3 VOCPBD TH2 0 8 V Minimum Quasi Resonant Signal Input Time 7 3 TOFF MIN 1 sec FB Terminal Threshold Voltage 6 3 VFB OFF 1 5 V FB Terminal Inflow Curre...

Страница 45: ...CP 850FX Service Manual Europe R D 44 5 CP 850FX CHASSIS DESCRIPTION 5 1 POWER SUPPLY BLOCK DIAGRAM Downloaded From TV Manual com Manuals...

Страница 46: ...CP 850FX Service Manual Europe R D 45 5 2 VIDEO STEREO AUDIO BLOCK DIAGRAM Downloaded From TV Manual com Manuals...

Страница 47: ...CP 850FX Service Manual Europe R D 46 5 3 IF SECTION 5 3 1 BLOCK DIAGRAM Downloaded From TV Manual com Manuals...

Страница 48: ...asing VIF input signal The control voltage AGC voltage at Pin 8 is transferred to an internal control signal and is fed to the tuner AGC to generate the tuner AGC current at Pin 11 open collector outp...

Страница 49: ...UND QPS MIXER The QPS mixer is realised by a multiplier The SIF signal FM or NICAM carrier is converted to the intercarrier frequency by the regenerated picture carrier quadrature signal which is prov...

Страница 50: ...ed between fast and slow behaviour to accommodate different input sources e g VCR 5 4 1 5 Chroma Decoder The digital multistandard chroma decoder is able to decode NTSC and PAL signals with a subcarri...

Страница 51: ...ta format corresponds to CCIR 656 with double scan format 8 bit bus at a data rate of 54 MHz There all frequencies and data rates are doubled compared to standard CCIR656 specification Timing referenc...

Страница 52: ...Transient Improvement LTI For small detail amplitudes the dynamic peaking is the most appropriate processing to improve the sharpness However for large amplitudes even small over and or undershoots of...

Страница 53: ...over and undershoots at the chroma transition the sharpened chroma signals are limited to a proper value automatically a Cr Cb input of CTI b Cr Cb input correction signal c sharpened and limited Cr...

Страница 54: ...lay processor is equipped with an 9 12 bit PDM ADC for all picture tube measuring purposes This MADC is connected to the SENSE input pin the input range is 0 to 2 6 V Cutoff and white drive current me...

Страница 55: ...e H drive off time and period In case of an incorrect H drive signal the security unit generates a free running h drive signal divided down from beam current 5 4 2 14 EHT Compensation The vertical def...

Страница 56: ...odulation Low Positive modulation L L 22 SECAM L High impedance Push Pull Low L High L 23 IR High impedance High impedance Infrared Interrupt input 24 SOUND INT Input input Sound interrupt input edge...

Страница 57: ...ices b4 b5 b6 b7 Group 3 Subtitles b8 b9 b10 Group 4 Reserved b11 b12 b13 The signal contains bits in Data Group 1 which define an Aspect Ratio label and in Data Group 3 b10 which defines if subtitles...

Страница 58: ...ailable with 16 9 cathode ray tube 4 3 AUTO selectable 14 9 AUTO selectable ZOOM 14 9 AUTO selectable ZOOM 16 9 AUTO selectable FULL SCREEN AUTO selectable PANORAMA only available selectable by the us...

Страница 59: ...ilable with a 4 3 CRT and their given properties Zoom factor 4 3 CRT Format Name Vertical Horizontal Description Application 14 9 87 100 Picture is centred with black bars at the top and bottom of the...

Страница 60: ...s the FAST SWITCHING input of the first SCART AV 1 on pin number 16 The second SCART AV 2 input does not possess a FAST SWITCHING input The HIGH state of a slow switching input represents the request...

Страница 61: ...ies meanings according to the local code of practice This is not as bad as it first seems as we use the user selected OSD language to identify the intention of the broadcaster For example a user wishi...

Страница 62: ...Euro Bulgarian Russian 1 1 1 Rumanian Rumanian Cyrillic 5 7 SOUND PROCESSING 5 7 1 ANALOGUE SOUND IF INPUT SECTION The input pins ANA_IN1 and ANA_IN offer the possibility to connect sound IF sources t...

Страница 63: ...c switching the threshold levels mono to stereo and stereo to mono is different When the sound mode change the MSP firmware informs the microcontroller by rising pin 4 This generates an interrupt to t...

Страница 64: ...oltage across R302 which provides internal feedback information The voltage across R302 is proportional to the output current 5 9 1 FLYBACK VOLTAGE The flyback voltage is determined by an additional s...

Страница 65: ...n rising the Vcc terminal voltage does not fall up to the operation stop voltage to maintain the start up operation However with larger capacity of C3 it takes much time after AC input to reach the op...

Страница 66: ...t current of STR W6700 itself and C3 is charged up to the peak value by the surge voltage generated instantly after the MOSFET is turned OFF In order to prevent this it is effective to add a resistor...

Страница 67: ...from the auxiliary winding of the transformer and the voltage is in proportion to the output voltage thus the circuit also operates at that time when the overvoltage output of the secondary side comes...

Страница 68: ...ltage waveform when the latch circuit is under operation The latch circuit operation is cancelled by reducing the Vcc terminal voltage below 7 3V TYP and generally it is restarted by AC input switch o...

Страница 69: ...ry winding voltage does not fall Although the intermittent operation is not provided the operation itself can be protected by the OLP circuit In the overload mode the mode in which the drain current i...

Страница 70: ...nditions Furthermore the power supply start up voltage turning OCP operation is also needed to confirm 5 10 2 3 Operation at Power Supply OFF The voltage of the condenser mounted externally to SS OLP...

Страница 71: ...11V BURST SW1 12 13 The constant voltage controlling circuit makes the control signal FB current flowing from the secondary side error amplifier input to No 6 terminal by the photo coupler The input F...

Страница 72: ...ircuit operation OCP it turns OFF the MOSFET at that time when OCP BD terminal threshold voltage reaches VOCPBD LIM by the voltage generated at the overcurrent detecting resistor R5 after the switchin...

Страница 73: ...N the MOSFET at that time when the VDS of the MOSFET reaches the lowest point In addition to the Quasi Resonant operation in order to control the increase of the oscillating frequency at light to medi...

Страница 74: ...BD BS2 VOCP 16 1 Quasi Resonant Operation Bottom Skip Operation The Quasi Resonant is operated under the mode that VOCP is higher than VOCPBD BS2 at the absolute rating Where the load becomes lighter...

Страница 75: ...stand by non operation and with the charging to the back up condenser through a start up resistor the VCC terminal voltage Pin No 4 rises again and the HIC starts its operation immediately after the V...

Страница 76: ...required to secure the voltage exceeding the required output voltage of secondary side Fig 18 Timing Chart at Operation Switching Normal Operation Feedback Stop Voltage Start up Voltage Normal Operati...

Страница 77: ...FET drive circuit as shown in Fig 19 The drive current at Turn ON is controlled at low by RG1 first and it makes the gate voltage increase gradually and the gate voltage is increased rapidly through R...

Страница 78: ...DTF 2950FZF SB E1 4856310300 EYE LET BSR T0 2 R1 6 SMALL E2 4856310300 EYE LET BSR T0 2 R1 6 SMALL E3 4856310300 EYE LET BSR T0 2 R1 6 SMALL E4 4856310300 EYE LET BSR T0 2 R1 6 SMALL E5 4856310300 EYE...

Страница 79: ...2W 8 2 OHM J SMALL R407 RF01Y129JA R FUSIBLE 1W 1 2 OHM J A CURVE R444 RS02Y330JS R M OXIDE FILM 2W 33 OHM J SMALL R801 DJ5020M270 POSISTOR J502P72D070M270 R803 RS02Y338JS R M OXIDE FILM 2W 0 33 OHM J...

Страница 80: ...A 50V X7R 1000PF K 1608 CC560 HCBK102KBA C CHIP CERA 50V X7R 1000PF K 1608 CC561 HCBK104KBA C CHIP CERA 50V X7R 0 1MF K 1608 CC567 HCBK102KBA C CHIP CERA 50V X7R 1000PF K 1608 CC568 HCBK104KBA C CHIP...

Страница 81: ...V C ELECTRO 25V RSS 10MF TP C505 CEXF1E100V C ELECTRO 25V RSS 10MF TP C506 CEXF1E100V C ELECTRO 25V RSS 10MF TP C524 CEXF1E470V C ELECTRO 25V RSS 47MF 5X11 TP C530 CEXF1E100V C ELECTRO 25V RSS 10MF TP...

Страница 82: ...K AXIAL C534 CCZB1H103K C CERA 50V B 0 01MF K AXIAL C536 CCZB1H102K C CERA 50V B 1000PF K AXIAL C537 CCZB1H103K C CERA 50V B 0 01MF K AXIAL C538 CCZB1H103K C CERA 50V B 0 01MF K AXIAL C540 CCZB1H333K...

Страница 83: ...ATING J378 85801060GY WIRE COPPER 1 0 6 TIN COATING J379 85801060GY WIRE COPPER 1 0 6 TIN COATING J38 85801060GY WIRE COPPER 1 0 6 TIN COATING J380 85801060GY WIRE COPPER 1 0 6 TIN COATING J381 858010...

Страница 84: ...330J R CARBON FILM 1 6 33 OHM J R514 RD AZ151J R CARBON FILM 1 6 150 OHM J R515 RD AZ223J R CARBON FILM 1 6 22K OHM J R516 RD AZ752J R CARBON FILM 1 6 7 5K OHM J R517 RD AZ471J R CARBON FILM 1 6 470 O...

Страница 85: ...YW025 05 P501A 4859235120 CONN WAFER YW025 08 P903 4859238620 CONN WAFER YPW500 02 R906 RF02Y629J R FUSIBLE 2W 6 2 OHM J SCT1 4859304130 SOCKET CRT ISHG93S ZZ200 PTCPJRT2950FS PCB CRT RADIAL AS DTF 2...

Страница 86: ...Europe R D CP 850FX Service Manual 79 7 EXPLODED VIEW Downloaded From TV Manual com Manuals...

Страница 87: ...Europe R D CP 850FX Service Manual 80 8 PRINTED CIRCULT BOARD 8 1 MAIN PCB Downloaded From TV Manual com Manuals...

Страница 88: ...Europe R D 81 CP 850FX Service Manual PRINTED CIRCULT BOARD 8 2 UNION PCB Downloaded From TV Manual com Manuals...

Страница 89: ...82 CP 850FX Service Manual Europe R D PRINTED CIRCULT BOARD 8 3 CRT PCB Downloaded From TV Manual com Manuals...

Страница 90: ...Europe R D CP 850FX Service Manual 83 9 SCHEMATIC DIAGRAM 9 1 MAIN Downloaded From TV Manual com Manuals...

Страница 91: ...84 CP 850FX Service Manual Europe R D 9 2 UNION CRT Downloaded From TV Manual com Manuals...

Страница 92: ...DAEWOO ELECTRONICS CORP PRINTED DATE SEP 2006 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA Downloaded From TV Manual com Manuals...

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