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SERVICE MANUAL

1.4 Vertical scan output stage circuit LA7840/L

1.4.1 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

1.4.2 Block Diagram

Fig.12

1.4.3 Refer to Table 6 about Functions and Service Data of LA7840

s Pins.

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Summary of Contents for MCR51R410

Page 1: ...follow the Safety Precautions in the Basic Service Data First Edition First Printing Copyright 2003 Thomson inc Printed in U S A Trademark s Registered Marca s Registrada s CN 12C5 CN 12C5 CN 12C5 Nov 03 Models Included MCR51R410 MCR51R420 MCR53TF30 Contents Page Specifications 1 Safety Precautions 2 Adjustments 4 Chassis Overview 14 Circuit Descriptions 17 IC Pin Out and Functional Descriptions 1...

Page 2: ... C12 UHF C13 C57 Receiving channel CATV Z1 Z37 Channels preset 236 Picture tube Effective screen dimensions Approx 280 210mm 406 305mm Audio output THD 7 2W Power source 220 240V AC 50Hz Weight Approx 11 5kg 23 5kg 28kg Dimensions W H D Approx 375 356 370mm 600 468 486mm 605 480 489mm Rated power consumption 220V AC 50Hz 80W 69W 100W Designs and specifications are subject to change without notice ...

Page 3: ...y 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 SAFETY PRECAUTION WARNING REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY 1 The TV has a nominal working EHT voltage of 28kV Extreme caution should be exercised when working on the TV with the back removed 1 1 Do not attempt to serv...

Page 4: ... 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 p...

Page 5: ...nts 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 t...

Page 6: ...et 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 slid...

Page 7: ... and green line 2 1 6 Remember red and blue movement Repeat steps 3 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 convergenc...

Page 8: ...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 I2 C bus control change the bus data to adjust white balance Circuit Adjustments Preparation Circuit adjustments should be made only after completion of set up adjustments Circuit adjustments can be performed usin...

Page 9: ...Regulate voltage adjustment components on the power PCB to make the voltmeter read 130 1V 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 picture tube 3 2 Plug in the supply socket 220V AC and turn...

Page 10: ...nfinity with a DC 500 high resistance meter and insulation resistance between the naked metal and degaussing coil to be over 20M 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 S AFW 24...

Page 11: ... SUB BRIGHT 63 SUB CONT SUB CONTRAST 63 V KILL VERTICAL KILL 0 RF AGC RF AGC 20 R BIAS RED BIAS 130 G BIAS GREEN BIAS 130 B BIAS BLUE BIAS 130 R DRIVE RED DRIVE 75 G DRIVE GREEN DRIVE 15 B DRIVE BLUE DRIVE 75 MENU 02 SECAM B DC SECAM B Y 9 SECAM R DC SECAM R Y 9 S DVD B DC S DVD B Y 6 S DVD R DC S DVD R Y 6 SYNC KIL SYNC KILL 0 H BLK L HORIZONTAL BLANKING LEFT 4 H BLK R HORIZONTAL BLANKING RIGHT 4...

Page 12: ...Y GAIN BALANCE 15 R B ANGLE R Y B Y ANGLE 15 CD MODE VERTICAL COUNTDOWN MODE 0 GREY MODE GREY MODE V SETUP VERTICAL SETUP 0 MENU 07 BLANK DEF BLANK DEFEAT 0 BRT ABL TH BRIGHT ABL THRESHOLD 1 RGB TEMP RGB TEMPERATURE CHARACTERISTICS 1 BRT ABL DF BRIGHT ABL DEFEAT 1 MID STP DF BRIGHT MID STOP DEFEAT 1 FBP BLK SW FBP BLANKING OR SWITCH 0 MENU 08 DIGITAL OSD DIGITAL OSD MODE 0 OSD CONT OSD CONTRAST CO...

Page 13: ...NKING CONTROL SW 0 SND TRAP SOUND TRAP CONTROL 1 HALF TONE HALF TONE LEVEL 3 HALF T SW HALF TONE ON OFF SW 1 TST VRESET TST VRESET 0 MENU 12 E W DC E W DC 32 E W AMP E W AMP 32 E W TILP E W TILP 32 E W C TOP E W C TOP 5 E W C BOTM E W C BOTM 5 MENU 13 MENU 13 E W TEST E W TEST 7 HSIZE COMP HORIZONTAL SIZE COMPENSATION 7 IF TEST 3B IF TEST 3B 0 V LEV ADJ VIDEO LEVEL ADJUSTMENT 0 OV MOD LEV OV MOD L...

Page 14: ...RREC ROM CORRECTION 0 MENU 17 MENU 17 OPT BTSC OPT BTSC 0 OPT AV INP OPT AV INPUT 0 OPT BBE OPT BBE 0 SUB BASS SUB BASS 3 SUB TREBLE SUB TREBLE 3 OPT COLOR OPT COLOR 0 OPT LNG1 OPT LNG1 0 OPT LNG2 OPT LNG2 0 OPT LNG3 OPT LNG3 0 MENU 18 MENU 18 LOUDNESS LOUDNESS 9 FM AM PRES FM AM PRESET 63 SCART PRES SCART PRESET 27 SCART VOL SCART VOL 117 OPT AVC OPT AVC 1 AVC DECAY AVC DECAY 2 Notes The data she...

Page 15: ...14 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 1 Structure Block Diagram ...

Page 16: ...15 2 Block Diagram for Supply Voltage System ...

Page 17: ...16 3 System Control Block Diagram ...

Page 18: ...3440 also developed by Japan based Sanyo is an I2 C bus control 8 bit CMOS single chip microprocessor It consists of 48K 8 ROM bit 640 8 RAM bit OSD controller on chip 36 characters 16lines remote control signal sensor PWM output 7bit 3ch I2 C bus serial interface featuring high performance and wide usage The chassis has features of multi system reception and audio video input output The CN 12C5 c...

Page 19: ...SERVICE MANUAL SERVICE DATA 1 Technical Data of Key ICs 1 1 Small signal processor LA76818A a Block Diagram Fig 7 18 ...

Page 20: ...al Vcc 13 ABL 42 External Video Input Y In 14 Red Input 41 Video Vertical Bus Ground 15 Green Input 40 Selected Video Output 16 Blue Input 39 Chroma APC1 Filter 17 Fast Blanking Input 38 4 43MHz Crystal 18 RGB Vcc 37 Clamp Filter 19 Red Output 36 Chroma APC2 Filter 20 Green Output 35 SECAM R Y Input Cr input 21 Blue Output 34 SECAM B Y input Cr input 22 Fsc output C Sync output 33 CCD Horizontal G...

Page 21: ...sed Caption TV controller and the on screen display controller Closed Caption data slicer Four channels 6 bit AD Converter Three channels 7 bit PWM 16 bit timer counter 14 bit base timer IIC bus compliant serial interface circuit Multi master type ROM correction function 11 source 8 vectored interrupt system Integrated system clock generator and display clock generator Only one X tal oscillator 32...

Page 22: ...SERVICE MANUAL 1 2 2 System Block Diagram Fig 8 1 2 3 Refer to Table 3 about Functions and Service Data of LC86F3448A s Pins 21 ...

Page 23: ... 7 to 5 5V operation Two wire serial interface bus I2 C Bus compatible Filtered inputs for noise suppression with Schmitt trigger Clock frequency up to 400 kHz High programming flexibility Fig 9 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 10ms for up to 16 bytes High reliability...

Page 24: ...SERVICE MANUAL 1 3 2 Pin Configuration Fig 10 1 3 3 Block Diagram Fig 11 1 3 4 Refer to Table 4 about Functions and Service Data of ST24C04 s Pins 23 ...

Page 25: ...es Low power dissipation due to built in pump up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible 1 4 2 Block Diagram Fig 12 1 4 3 Refer to Table 6 about Functions and Service Data of LA7840 s Pins 24 ...

Page 26: ...L output amplifier with DC volume control The device is designed for use in TVs and monitiors 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...

Page 27: ... three sets of video signal inputs two sets of Y C separation signals inputs one set of video signal output one set of Y C separation signal output and one set of audio signal output 1 6 2 Block Diagram Fig 14 1 6 3 Value Table Level for Control Terminal 15 16 Switchover Mode H H TV H L AV1 L H SVHS L L AV2 1 6 4 Refer to Table 5 about Functions and Service Data of KA2102B KA2192B s Pins 26 ...

Page 28: ...input output Y0 and Y1 and the other side connected to a common input output Z selected low 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 can swing between VDD as a positiv...

Page 29: ...an be used in a range of applications from battery chargers and set top boxes to televisions monitors and industrial power supply units Cycle by cycle current limiting under voltage lockout with hysteresis over voltage protection and thermal shutdown protects the power supply during the normal overload and fault conditions Low current startup and a low power standby mode selected from the secondar...

Page 30: ...uration and Functions Dwg MK 003 50 Fig 17 a Pin function for STR G5653 29 Pin No Symbol Function Description 1 D MOSFET drain 2 S MOSFET source 3 GND Ground 4 VIN Supply voltage input for control circuit 5 OCP FB Over current protection detection signal voltage limiting signal input ...

Page 31: ...s Table 2 Service Data of LA76818A N101 s Pins GDM8145 Multimeter Pin No Function Description Voltage V Positive Resistance k Negative Resistance k 1 Audio Output 2 2 6 82 7 6 2 FM output Selected Audio Output 2 41 6 59 486 6 3 PIF AGC 1 98 6 99 512 7 4 RF AGC Output 3 73 26 4 5 PIF Input1 2 84 6 71 29 6 PIF Input2 2 84 6 71 7 IF Ground 0 0 0 8 IF Vcc 5 0 41 0 38 9 FM Filter 2 22 7 06 0 76 10 AFT ...

Page 32: ...t 2 375 544 6 275 35 SECAM R Y Input Cr Input 2 377 544 6 273 36 Chroma APC2 Filter 3 237 582 6 644 37 Clamp Filter 1 738 6 67 38 4 43MHz Crystal 2 76 350 6 4 39 Chroma APC1 Filter 3 42 6 56 40 Selected Video Output 2 22 6 254 41 Video Vertical Bus Ground 0 0 42 External Video Output Y In 2 63 43 Video Vertical Vcc 5 0 42 44 Internal Video Input S C IN 2 5 572 6 358 45 Black Level Detector 2 27 0 ...

Page 33: ...nal 2 0 015 8 86 3 81 13 Reset 5 27 4 67 1 88 14 Character oscillating filter 3 87 1 11 4 98 15 Video signal input terminal 3 53 12 3 4 50 16 Three bits input output terminals 0 01 9 76 15 0 17 Input terminal for vertical flyback pulse 5 07 15 4 18 1 18 Input terminal for horizontal flyback pulse 4 62 17 4 18 4 19 R character output terminal 0 015 3 92 3 29 20 G character output terminal 0 014 3 9...

Page 34: ... 3 Address input terminal 0 00 0 00 0 00 4 Common ground 0 00 0 00 0 00 5 Clock line 4 94 6 85 4 83 6 Data line 4 94 6 89 5 15 7 PW write protection terminal 0 00 9 58 5 31 8 Supply voltage 5 32 3 5 3 25 Table 5 Functions and Service Data of KA2102B K2192B NV01 s Pins DT890D Digital Multimeter Ground Resistance K Pin No Function Description Voltage of Pin V Measure with red probe while grounding b...

Page 35: ...28 VCC 9 38 0 34 0 33 29 VCC 9 38 0 31 0 30 30 V OUT 3 17 6 47 0 48 Table 6 Functions and Service Data of LA7840 N301 s Pins DT890D Digital Multimeter Ground Resistance K Pin No Function Description Voltage of Pin V Measure with red probe while grounding black probe Measure with black probe while grounding red probe 1 Ground 0 0 0 2 Vertical output terminal 14 8 365 360 3 Pump supply voltage input...

Page 36: ... 5 59 Table 8 Functions and Service Data of HEF4053BP NK01 s Pins DT890D Digital Multimeter Ground Resistance Kȍ Pin No Function Description Voltage of Pin V Measure with red probe while grounding black probe Measure with black probe while grounding red probe 1 Signal input terminal 3 91 6 31 012 2 Signal input terminal 5 01 6 31 0 11 3 Signal input terminal 0 00 0 00 3 41 4 Signal output terminal...

Page 37: ...as specified in the manual Description of the special markings A The components identified by the A marking have special safety related characteristics AE The components identified by the AE marking are listed by EMC and have special safety related characteristics CB The components identified by the CB marking have been evaluated to the CB standard E The components identified by the E marking are ...

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Page 39: ...Printed Circuit Board diagrams 1 ...

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Page 42: ...MCR51R410 Main Diagram Chassis CN 12C5 ...

Page 43: ...10 busco manual Respuesta 5 en Hoy a las 12 57 07 ________________________________________ Claro mi migo aqui te mando la secuencia para el modo service vol a cero presiona mute en control remoto y menu en tv al mismo tiempo y ya estas en modo service ojala y te sirva CON LOS CURSORES UP DONW CAMBIA PARAMETROS CURSORES LATERALES CAMBIA VALORES bueno espero y soluciones tu problema saludos desde El...

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