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21LF-90N

SERVICE MANUAL

This document has been published to
be used for after sales service only.

AK- 44

CHASSIS

In the interests of user safety (required by safety
regulations in some countries) the set should be re-
stored to its original condition and only parts identi-
cal to those specified should be used.

SHARP CORPORATION

CONTENTS

MODEL

21LF-90N

0021

LF90N00

Issued: 16

Feb. 2004

PAL

B/G

/ SECAM

L/L’, B/G, D/K

SYSTEM COLOUR TELEVISION

In order to service the model 21LF-90N, refer to
the AK-44 Chassis Service Manual
(SE

AK44CHA00).

Summary of Contents for 21LF-90N

Page 1: ...and only parts identi cal to those specified should be used SHARP CORPORATION CONTENTS ELECTRICAL SPECIFICATIONS 3 IMPORTANT SERVICING NOTES 4 CONTROLS TERMINALS 5 PRINTED WIRING BOARD LAYOUT 6 PARTS LISTING 7 HOW TO UPDATE THE TECHNICAL INFORMATION 11 MODEL 21LF 90NES SE0021LF90N00 Issued 16th Feb 2004 PAL B G SECAM L L B G D K SYSTEM COLOUR TELEVISION In order to service the model 21LF 90N refer...

Page 2: ...f only part number changes are required just change part number directly the part number in the Parts Listing Section If you need more information please refer to the Technical Report Bulletin SERVICE MANUAL UPDATE LOG SHEET Part No Technical Report No Technical Bulletin No Cause Solution Page No Application Data Serial No ...

Page 3: ...2 4MHz L D K B G 40 4MHz Adjacent Picture Carrier Trap L 41 9MHz L D K 30 9MHz B G 31 9MHz Aerial Input Impedance VHF UHF 75 ohm Unbalanced Tuning Ranges 48 25MHz thru 855 25 MHz VHF S1 S41 CH Hiperband E2 E12 F2 F10 UHF E21 E69 Power Input 220V 240 Volts AC 50 Hz Power Consumption Normal Operation Method IEC60107 62 W Stand by Operation 3 W Audio Power Output Rating MPO Impedance Internal Left Sp...

Page 4: ...us x ray radiation levels This is a problem when in close proximity to the receiver for long periods of time To reduce any risks associated with this please observe the following precautions 1 When undertaking any servicing on this chassis DO NOT increase the EHT to more than 30 0 KV at a instantaneous beam current of 1300 µA 2 Ensure that during normal operation the EHT does not exceed 25 55 KV a...

Page 5: ...V RGB 13 Yellow Feature Menu 14 Blue Installation Menu 15 Hold 16 Update 17 Index Page 18 Reveal 19 Expand 20 Mix 21 Teletext 22 Time 23 Red Sound Menu 24 Green Picture Menu 25 Mute 26 I II Mono Stereo Dual I II 27 Volume 28 P CH Program 29 Flash back button 30 M Menu 31 Cursor Down 32 Cursor Left CH MENU Speakers left right Power On Off Volume CH Program MENU Menu VIDEO VCR AUDIO L Audio left AUD...

Page 6: ...6 21LF 90N CHASSIS LAYOUT Mother Unit CRT Unit Headphone Unit ...

Page 7: ...CUITS X100 30002852 XTAL REZ 455KHZ AA AD X401 30001749 XTAL 4 433619 MHZ AK15 AC AK X402 30015592 XTAL 3 579545 WO LOAD CAP AB AG X403 30000074 CAP MKT 100NF 63V J AA AC X501 30002851 XTAL 4MHZ L C 30PF AC AH X700 30001756 XTAL 18 432MHZ AE AP COILS L1001 30001996 FIXED COIL 22UH Q40 K AA AB L1002 30001996 FIXED COIL 22UH Q40 K AA AB L101 30013412 FERRITEBEAD 0805 MMZ2012Y152B AA AA L110 30013412...

Page 8: ...0393 CAP EL 3 3UF 50V M AA AB C733 30000345 CAP EL 10UF 50V M AA AB C734 30000345 CAP EL 10UF 50V M AA AB C736 30000345 CAP EL 10UF 50V M AA AB C737 30000371 CAP EL 22UF 50V M AA AB REF No PARTS DESCRIPTION SN CODE EX CODE C738 30000371 CAPEL22UF50VM AA AB C801 30000094 CAPMKTSAFE220NF275VMAC AA AB C802 30000094 CAPMKTSAFE220NF275VMAC AA AB C803 30000433 CAPCER1NF1KVMB AA AB C805 30018085 CAPVARSA...

Page 9: ...E 5P SIDE WHITE AA AA PL100 30018454 CONN HEADER 2P 2 5MM TOP BLACK AA AA PL100 30027658 CNAS 2P 3P 300 W C BLK WHT UL1007AWG24 AB AF PL101 30015053 SOCKET SCART NEW TYPE AB AF PL105 30001830 CONN HEADER 2P 2 5MM TOP BLUE SD AA AB PL107 30001835 CONN HEADER 3P 2 5MM TOP WHT SD AA AB PL109 30015192 CONN HEADER 2P 2 5MM TOP YELLOW SD AA AA PL110 30001830 CONN HEADER 2P 2 5MM TOP BLUE SD AA AB PL110 ...

Page 10: ...A 35008812 SCREW P C ZN RYSB 3x10 AA AB 35009300 SCREW P C SYF RYSB 4 11 AA AB 40016817 LOGO SHARP D C SILVER 21 RF AC AH 50043630 WARRANTY CARD SHARP ESP AB AF 50043894 CONTROL STICKER STREO 2163RF SHARP AD AN 50048335 CARTON BOX SHARP SHARP 2163 AL AX 50048448 I B SHARP 21LF90N ES P AK44 1548 ES POR AD AL COSMETICS 20140383 BACK CVR 2163RF EKO2GRAY AK44 AQ BA 20140387 SNOW BOX TOP 2163RF SHARP A...

Page 11: ... www vestelservice com 2 Select Technical Support 3 Login 101278 4 Password SHPII278 By this access you can consult the latest schematic diagram or request the Parts Listing of a concrete Production Date Serial Number By this way it can be also consulted the issued Technical Reports Service Bulletins ...

Page 12: ...cal photocopying recording or otherwise without prior written permission of the publisher Technical information and Production Vestel Electronik AS Technical information re issued SHARP ELECTRONICA ESPAÑA S A Service Manual Group Engineering Dept Polígono Industrial Can Sant Joan 08190 Sant Cugat del Vallès Barcelona Spain Think Ecology please use RECYCLED PAPER ...

Page 13: ...e countries the set should be re stored to its original condition and only parts identi cal to those specified should be used CONTENTS TABLE OF CONTENTS 3 INTRODUCTION 6 CIRCUIT DESCRIPTIONS 6 INTEGRATED CIRCUIT DESCRIPTIONS 13 BLOCK DIAGRAM 22 SERVICE MODE ADJUSTMENTS 23 HOTEL MODE FUNCTIONS 30 CIRCUIT DIAGRAMS 31 HOW TO UPDATE THE TECHNICAL INFORMATION 41 SHARP CORPORATION SE00AK44CHA00 Issued 9...

Page 14: ...c If only part number changes are required just change part number directly the part number in the Parts Listing Section If you need more information please refer to the Technical Report Bulletin SERVICE MANUAL UPDATE LOG SHEET Part No Technical Report No Technical Bulletin No Cause Solution Page No Application Data Serial No ...

Page 15: ...Sound Path 9 2 12 AV Input Signal Path 9 2 12 1 Video and Sound 9 2 12 2 RGB 9 3 TUNER 9 4 DIGITAL TV SOUND PROCESSOR MSP34X0 10 5 SOUND OUTPUT STAGE TDA7266L TDA7266 10 6 VERTICAL OUTPUT STAGE WITH TDA8174A 10 7 VIDEO OUTPUT AMPLIFIER TDA6107 11 8 POWER SUPPLY SMPS 11 8 1 Start Up 11 8 2 Voltage Regulation 11 8 3 Voltage Protection 11 8 4 Current Regulation 11 8 5 Standby operation 12 8 6 Mode tr...

Page 16: ...4 3 1 AVL 24 14 3 2 Geometry Menu 25 14 3 2 1 Geometry Table 25 14 3 2 1 Geometry Table 25 14 3 3 Screen Adjustment 26 14 3 4 IF Adjustment 26 14 4 Auto Programming System Set Up 25 15 OPTIONS 27 15 1 Service Registers updating regarding the Tuner 27 15 2 Registers details 28 16 LANGUAGES 30 17 HOTEL MODE FUNCTIONS 30 18 SCHEMATIC DIAGRAMS 31 19 HOW TO UPDATE THE TECHNICAL INFORMATION 41 ...

Page 17: ...s to use a return path on the same side of TR802 for the Voltmeter earth to obtain the correct readings Measurements Voltage readings and oscilloscope traces are measured under the following conditions Antenna signal s level is 60dB at the color bar pattern from the TV pattern generator 100 white 75 color saturation Brightness contrast and color are adjusted for normal picture performance Mains su...

Page 18: ...signal amplitude are required For this reason the inter carrier signal is internally supplied to the demodulator via a gain controlled amplifier and AGC circuit The nominal frequency of the demodulator is tuned to the required frequency 4 5 5 5 6 0 6 5 MHz by means of a calibration circuit that uses the clock frequency of the µ controller Teletext decoder as a reference The setting to the wanted f...

Page 19: ...systems and do not need external capacitor All chroma filters are fully integrated and tuned via a PLL locked on Xtal VCO signal A second PLL is used for accurate fine tuning of the SECAM bell filter This tuning is achieved during the frame blanking An external capacitor memorizes the bell filter tuning voltage A base band chroma delay line rebuilds the missing color line in SECAM and removes tran...

Page 20: ...4 On switching on pin 2 becomes high and the controller gets reset which stays valid till a low signal comes on that pin 2 9 1 Controls Command information from the infrared remote controller is fed through the sensor IC502 to pin 1 of the micro processor Operation of the customer front panel keys is detected by pin 8 that is an ADC analogue to digital converter Pressing a switch will connect the ...

Page 21: ... right channel and R463 R464 for the left channel IC403 handles also the AM modulated signals in L L systems at pins 1 2 2 12 AV Input Signal Path 2 12 1 Video and Sound IC403 has three CVBS inputs at pins 18 20 and 22 The composite video signal of AV1 is taken from pin 20 of the Scart connector to pin 20 of IC403 The mono sound signal is taken from pins 2 and 6 of the Scart sockets to the switchi...

Page 22: ...ion and decoding of NICAM coded TV stereo sound The MSP 34x0G offers a powerful feature to calculate the carrier field strength which can be used for automatic standard detection terrestrial and search algorithms satellite 5 SOUND OUTPUT STAGE TDA7266L TDA7266 TDA7266L is used as the AF output amplifier for mono applications It is supplied by 12 VDC coming from a separate winding in the SMPS trans...

Page 23: ...ect the secondary reconfiguration status and the 120mA level to detect an Over Voltage status called Quick OVP The VCC at pin6 operates between 6 6V and 13V in normal operation when this voltage exceeds 15V then the IC output is disabled 8 2 Voltage Regulation After initial start up the secondary voltages of TR802 are established These voltages then need to be regulated to the required levels In a...

Page 24: ... regulation is performed by the Zener diode D801 connected in parallel to the TL431 The secondary reconfiguration status can be detected on the SMPS primary side by measuring the voltage level at pin4 of TR802 In the SMPS stand by mode the 3 distinct phases are The SWITCHING PHASE Similar to the Overload mode The current sense clamping level is reduced When VCC crosses the current sense section th...

Page 25: ...6 08 bits The memory is compatible with the I C standard two wire serial interface which uses a bi directional data bus and serial clock EEPROM Initialisation If the E PROM IC500 is replaced it will come fully programmed and therefore it is not necessary to initialise the new device In some circumstances the E PROM may become corrupted in use i e static discharge or lightning strike If this happen...

Page 26: ... Additional peripherals include a watchdog timer a serial peripheral interface SPI a 16 bit timer and an A D converter g g INT7 P2 0 RESET P0 7 P0 6 P0 5 P0 4 P0 3 AIN4 P0 2 P0 1 P0 0 CSO RESET0 P3 7 P3 6 P3 5 P3 4 B G R FB SDA1 SDI SDO P5 1 SCL1 SCK INT2 P5 0 VDD JTDO WSCF VPP WSCR AVDD3 TEST0 MCFM JTCK P2 1 INT5 AIN1 P2 2 INT0 AIN2 P2 3 INT6 VS01 P2 4 NMI P2 5 AIN3 INT4 VS02 OSCIN OSCOUT P4 7 PW...

Page 27: ... 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 Figure 2 Pin connections STV224X 8X SDIP56 UV1315 UV1316 UV1336 General description of UV1315 The UV1315 tuner belongs to the UV 1300 family of tuners which are designed to meet a wide range of applications It is a combined VHF UHF tuner su...

Page 28: ... 0 V Max 4 5 V 2 Tuning voltage 3 I C bus address select Max 5 5 V 4 I C bus serial clock Min 0 3 V Max 5 5 V 5 I C bus serial data Min 0 3 V Max 5 5 V 6 Not connected 7 PLL supply voltage 5 0 V Min 4 75 V Max 5 5 V 8 ADC input 9 Tuner supply voltage 33 V Min 30 V Max 35 V 10 Symmetrical IF output 1 11 Symmetrical IF output 2 General description of UV1336 UV1336 series is developed for reception o...

Page 29: ...UIT PROTECTION THERMAL OVERLOAD PROTECTION Pinnig 1 N C 2 N C 3 MUTE 4 ST BY 5 PW GND 6 S GND 7 IN 8 VCC 9 OUT 10 OUT General Description of TDA7266 The TDA7266 is a 2x7 Watt dual power amplifier It is used for sound amplification at stereo TV sets WIDE SUPPLY VOLTAGE RANGE 3 18 V MINIMUM EXTERNAL COMPONENTS NOSWR CAPACITOR NOBOOTSTRAP NO BOUCHEROT CELLS INTERNALLY FIXED GAIN STAND BY MUTE FUNCTIO...

Page 30: ...mponents required Very simple application Single supply voltage of 200 V Internal reference voltage of 2 5 V Fixed gain of 50 Black Current Stabilization BCS circuit with voltage window from 1 8 to 6 V and current window from 100 mA to 10 mA Thermal protection Internal protection against positive flashover discharges appearing on the CRT General Description The TDA6107JF includes three video outpu...

Page 31: ...uring scan 1 2 Ap p during flyback 5 Driver Output resistor 8 5 Ohm sink 15 Ohm source typ 6 Supply voltage Max 16 V Operating range 6 6 V 13 V 7 No connection 8 Line Voltage Min 50 V Max 500 V MSP34X0G The MSP 34x0G family of single chip Multistandard Sound Processors covers the sound processing of all analog TV Standards worldwide as well as the NICAM digital sound standards The full TV sound pr...

Page 32: ... the MSP 34x0G 24C08 General description The 24C08 is a 8 Kbit electrically erasable programmable memory EEPROM organized as 4 blocks of 256 08 bits The memory operates with a power supply value as low as 2 5 V Features Minimum 1 million ERASE WRITE cycles with over 10 years data retention Single supply voltage 4 5 to 5 5 V Two wire serial interface fully I C bus compatible Byte and Multi byte wri...

Page 33: ...d 0 V 5 Non inverting input B 2 5 V 6 Inverting input B Vo clip Min 1400 mVrms 7 Output B Voltage swing Min 0 75 V Max 4 25 V 8 Positive supply 5 V Min 3 0 V Max 7 0 V Saw filter s list VIDEO AUDIO PAL BG G1975M PSBG DK K2966M PAL II J1981 PSBGDKK II K2966M MONO PSBGDKK LL K2962M L9653 VIDEO AUDIO PAL BG G3967M G9353M PAL II K3958M K9356 PSBGDKK II K3958M K9356 STR PSBGDKK LL K3958M K9656 Pinning ...

Page 34: ... TDA6107 IF TDA8174AW SCART1 FAV 115V 12V AUD 8V 5V 5V St by ST92195 MICRO CONTROLLER MONO STV2248C VIDEO PROCESSOR RGB AMP VER AMP CRT HORIZONTAL DRIVE BU808DF FBT MSP 34X0G STEREO SOUND HP AMP TDA1308 AU AMP SERVICE CONNECTOR NVM KEYPAD IR SENSOR PLL VST TUNER UV1315 1316 SMPS MC 44608 VIDEO SWITCHING CIRCUITS ...

Page 35: ...justment It is not required to memorize the adjustment Data are stored automatically To exit the Service Mode Switch the TV off using the mains switch 14 2 Service Adjustments Default Values Register Parameter Notes A51EFS13X191 A51ELD032X001 OSD OSD Horizontal Position 70 81 IF1 IF Coarse Adjust X X IF2 IF Fine Adjust X X IF3 IF Coarse Adjust for L Prime X X IF4 IF Fine Adjust for L Prime X X AGC...

Page 36: ...Low Byte of crossover frequency for VHF1 VHF3 Meaningful for only PLL Tuner See 15 1 Service Registers Updating regarding the Tuner on Page 27 F2H High Byte of crossover frequency for VHF3 UHF Meaningful for only PLL Tuner See 15 1 Service Registers Updating regarding the Tuner on Page 27 F2L Low Byte of crossover frequency for VHF3 UHF Meaningful for only PLL Tuner See 15 1 Service Registers Upda...

Page 37: ...rom the Main Service Menu to the Geometry Menu as shows the figure 7 To return to the Main Service Menu it should be pressed the Menu button 30 see Figure 5 Figure 7 Geometry Menu Figure 8 Remote Control In the bottom area of this Menu it can be seen AUTO By pressing the WIDE MODE button 8 it changes to 4 3 or 16 9 format To perform the Geometry adjustments select the most suitable option AUTO ent...

Page 38: ...T 32 RIGHT 3 buttons to change the data See figure 5 Figure 9 VPOS Vertical Position Adjust the Vertical Position so that the picture is centred The effect of this adjustment is shown in figure 10 Use the CURSOR LEFT 32 RIGHT 3 buttons to change the data See figure 5 Figure 10 HPOS Horizontal Position Adjust the Horizontal Position so that the picture is centred The effect of this adjustment is sh...

Page 39: ...PTION LIST 15 1 Service Registers Updating regarding the Tuner AK30 PLL TUNER SETTINGS VHF1 VHF3 VHF3 UHF Frq Mhz Frq Mhz F1H F1L F2H F2L BS1 BS2 BS3 CB Philips UV1316S MK3 156 25 MHz 441 25 MHz 00001100 00110010 00011110 00000010 00000001 00000010 00000100 10001110 Thomson CTT5020 114 25 MHz 401 25 MHz 00001001 10010010 00011011 10000010 00000011 00000110 10000101 10001110 Samsung TECC2949PG28B 1...

Page 40: ...ilable in AV key stream OP2 Reception Standard Options 7 1 3 button keyboard V P V 0 4 5 button keyboard V V P P Menu 6 1 L L is available 0 L L is not available 5 1 I is available 0 I is not available 4 1 DK is available 0 DK is not available 3 1 BG is available 0 BG is not available 2 1 0RESERVED Keep as 000 OP3 Video Options 7 6 Xtal Configuration 00 1 Xtal PAL 4 43 01 2 Xtal PAL NTSC 4 43 3 58...

Page 41: ... msec blanking more for VST if OP4 b0 1 to SECAM color problem 0 no extra blanking 6 1 Programme item in AUTOSTORE menu is visible 0 Programme item in AUTOSTORE menu is invisible 5 NOT USED 4 1 French OS Channel Table is available 0 French OS Channel Table is not available 3 1 French Channel Table is available 0 French Channel Table is not available 2 1 England Channel Table is available 0 England...

Page 42: ...e Maximum Volume Level 2 Before Start It is necessary to program the channel setting tuning and sorting because after that this features will be deactivated 3 Procedure 3 1 Enter the Service Mode See Page 23 3 2 Access to OP4 Register by CURSOR UP DOWN 3 3 Press 4 button on the remote control in order to activate the Hotel Mode 3 4 Exit the Service Mode by the Menu button 30 3 5 Enter again the Se...

Page 43: ...31 AK 44 CHASSIS 18 CIRCUIT DIAGRAMS 18 1 Schematic Diagram of µ Controller IF Circuits 1 I H G F E D C B A 2 3 4 5 6 7 ...

Page 44: ...32 AK 44 CHASSIS 18 2 Schematic Diagram of Video Circuit 1 I H G F E D C B A 2 3 4 5 6 7 Page 33 ...

Page 45: ...33 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A Page 32 18 2 Schematic Diagram of Video Circuit ...

Page 46: ...34 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 Page 35 18 3 Schematic Diagram of SMPS Circuit ...

Page 47: ...35 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A Page 34 18 3 Schematic Diagram of SMPS Circuit ...

Page 48: ...36 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 18 4 Schematic Diagram of Audio Circuit ...

Page 49: ...37 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A 18 5 Schematic Diagram of Deflection Circuit ...

Page 50: ...38 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 Page 39 18 6 Schematic Diagram of Scart AV Front Circuits ...

Page 51: ...39 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A Page 38 18 6 Schematic Diagram of Scart AV Front Circuits ...

Page 52: ...40 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 18 7 Schematic Diagram of CRT Socket Circuit ...

Page 53: ...be found a Label in every chassis with additional information i e the used EEPROM See below On the next page are given details about the Code Bar Label 19 2 NVM EEPROM recorder There is available the NVM EEPROM recorder as spare part Part Reference V20096887 Description MD ASY PONYPROG Dom Price Code AT Exp Price Code BE This EEPROM recorder uses the free software Pony available at http www lancos...

Page 54: ...roduct code It is the code that indicates Vestel internal identification number of the complete TV set Year Production year in two digits e g 02 for 2002 Month Production month in two digits e g 04 for April Batch number It is a Vestel number that is assigned by the Planning Dept according to the customer orders For internal use by Vestel Consecutive Number The number that indicates the sequence o...

Page 55: ...43 AK 44 CHASSIS Notes ...

Page 56: ...nical photocopying recording or otherwise without prior written permission of the publisher Technical information and Production Vestel Electronik AS Technical information re issued SHARP ELECTRONICA ESPAÑA S A Service Manual Group Engineering Dept Polígono Industrial Can Sant Joan 08190 Sant Cugat del Vallès Barcelona Spain Think Ecology please use RECYCLED PAPER ...

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