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COLOR TELEVISION
SERVICE
MANUAL
21" T2S10 CHASSIS WITH NICAM&TELETEXT
CONTENTS
SAFETY PRECAUTION ......................................................... 1 SPECIFICATION .................................................................. 2 IC'S GENERAL DESCRIPTION ............................................. 3 SPECIAL IC INTRODUCTION ................................................ 3 CHASSIS BLOCK DIAGRAM ................................................ 12 SERVICE MODE&ADJUSTMENT .......................................... 13 TEST POINT WAVE FORM&SCHEMATIC DIAGRAM ............... 18
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SAFETY PRECAUTION
1. X-RAY RADIATION PRECAUTION
1.1 Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards the high voltage must be specified limit. The normal value of the high voltage of this receiver is 21" 25KV ±500V under 230V AC power source. The high voltage must not exceed 26KV for 21" TV 1.2 Each time a receiver requires servicing the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter. 1.3 The primary source of X -RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as used in this TV receiver. 1.4 Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement should be undertaken only after referring the PRODUCT SAFETY NOTICE below.
2. GENERAL SAFETY PRECAUTION
The following are the necessary precautions to be observed before servicing this chassis WARNING: Service should not be attempted by anyone unfamiliar with the necessary 2.1 Since the power supply circuit of this receiver is directly connected to the AC power line. An isolation transformer should be used during any dynamic service to avoid possible shock hazard. 2.2 Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatterproof goggles and keep picture tube away from the unprotected body while handling. 2.3 When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as: nonmetallic control; knobs, insulating covers, shields, isolation resistor-capacitor, network, etc. 2.4 Connection wires must be kept away from components with high voltage or high temperature. 2.5 When replacing parts or circuit boards, disconnect the power cord. 2.6 When replacing a high voltage resistor (metal oxide resistor) on circuit board, keep the resistor APP. 10mm (1/2 in.) away from circuit board. 2.7 If any fuse in this TV receiver is broken, replace it with the FUSE specified in the chassis parts list. 2.8 The receiver is designed to operate with 230V (50Hz) AC mains.
3. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATON protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, X-RAY RADIATION or other hazards.
Warning!
There are no any repairable components in this TV set. Do not try to make any change to it. High voltage inside may cause danger.
SPECIFICATION
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RF SYSTEM VIDEO SYSTEM TUNING SYSTEM RECEIVING CHANNEL PROGRAM PRESET AV JACKS TELETEXT ANTENNA INPUT AUDIO OUTPUT MAIN POWER POWER CONSUMPTION
COLOR SYSTEM: PAL SECAM SOUND SYSTEM:B/G D/K I NICAM STEREO PAL SECAM NTSC4.43 VOLTAGE SYNTHESIZER TUNING VHF-L: E2S6 48.25 MHz140.25MHz VHF-H: S7S36 147.25 MHz423.25MHz UHF: S37DS57 431.25 MHz863.25MHz 99 1 SIDE RCA AV IN 1 FULL SCART AND 1 AV SCART 1PAGE 75UNBALANCE 5W 170-260V AC 50/60Hz 21" 90W
CHIP GENERAL DESCRIPTION
1. MAIN BOARD PART
IC101 IC102 IC201 IC301 IC601 IC603 IC605 IC602 IC701 IC801 ST92195 24C08 STV2246 TDA8174A H11A817C MC7808CT MC7805CT CD7522CS STV8216 MCU With ON SCREEN DISPLAY and TELETEXT Decoder 8 Kbit Serial I2C Bus EEPROM I²C BUS-Controlled Multistandard Single Chip TV Processor VERTICAL DEFLECTION W.E/W CORRECTION CIRCUIT OPTOCOUPLERS +8V VOLTAGE REGULATOR +5V VOLTAGE REGULATOR 7W AUDIO AMPLIFIER Multi-standard TV Audio Processor and Digital Sound Demodulator
CHIP INTRODUCTION
1. ST92195
The ST92195 microcontrollers are developed and manufactured by STMicroelectronics using a proprietary n-well HCMOS process. Their performance derives from the use of flexible 256-register programming model for ultra-fast context switching and real-time event response. The intelligent on-chip peripherals offload the ST9 core from I/O and data management processing tasks allowing critical application tasks to get the maximum use of core resources. TheST92195 MCU support low power consumption and low voltage operation for power-efficient and low-cost embedded systems.
1.1 Main features
28 fully-programmable I/Os 4 channels Analog/Digital Converter Built in I2C bus interface Built in OSD and Teletext decoder 14-bit Voltage Synthesis PWM output for VS tuning system -2-
1.2 Pin description
Pin No. 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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Pin Name P2.0 RESET P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 P3.7 P3.6 P3.5 P3.4 B G R BLANK P5.1 P5.0 VDD JTDO WSCF WSCR AVDD3 TEST0 MCFM JTCK TXCF CVBSO AVDD2 JTMS CVBS2 CVBS1 AGND GND JTRST0 PXFM AVDD1 HSYNC VSYNC P4.0 P4.1 P4.2 Signal Name IRIN RESET NC MUTE NC ON/OFF DESIGN SCART1 SCART2 AV SEL S0 S1 TV/DVD DFD B G R BLANK SDA SCL VDD JTDO WSCF WSCR AVDD3 TEST0 MCFM JTCK TXCF CVBSO AVDD2 JTMS CVBS2 CVBS1 AGND GND JTRST0 PXFM AVDD1 HSYNC VSYNC BSW1 BSW2 SAW_SW1 I/O I I I/O O I/O O I I I O O O O O O O O O I/O O Function IR Input Hardware Reset Not Used Mute Output PIN Not Used Standby Output Service menu control Identify scart entering Design Identify scart entering Design AV Selection AV/TV AV/TV TV/DVD Default data control OSD Blue colour Signal Output OSD Green colour Signal Output OSD Red colour Signal Output OSD Blanking Output I2C data line I2C clock line +5 V Digital Supply Test Pin Analog Pin For VPS / WPP slicer line PLL Analog Pin For VPS / WPP slicer line PLL +5V Analog VDD For PLL Test Pin Analog Pin for display pixel freq. multiplier Test Pin Analog pin for VPS /WSS line PLL Test Pin Analog Power supply Test Pin CVBS In for VPS / WSS CVBS In for Teletext Slicer Analog ground Digital ground Test Pin Analog Pin for display pixel freq. multiplier Analog Power Supply Horizontal Sync Input Vertical Sync Input Band switch 1 Band switch 2 SAW Filter switch 1
I I
I I O O O -3-
45 46 47 48 49 50 51 52 53 54 55 56
P4.3 P4.4 P4.5 P4.6 P4.7 XTAL XTAL P2.5 P2.4 P2.3 P2.2 P2.1
NC SAW_SW2 NC Vlin PWM VOL PWM XTAL XTAL LED2 LED1 VS NC KB INPUT
I/O O I/O O O
O O O I/O I
Not connected SAW Filter switch 2 Not connected V-linearity PWM output VOL PWM output Clock oscillator Clock oscillator LED driver LED driver VST Voltage ouput Not connected KEY Input
1.3 Block diagram
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1.4 General application description
BAND SWITCH OUTPUT (Pin42 Pin43) Pin42 BSW1 0 0 1 1 KEY IN (Pin 56) 0.285 ~ 0.587V 0.706 ~ 1.098V 1.204~ 1.596V 1.704 ~ 2.096V 2.194 ~ 2.586V 2.704 ~ 3.096V 3.205 ~ 3.606V 3.745 ~ 4.145V 4.282 ~ 4.682V Pin43 BSW2 0 1 0 1 KEY PRESSED Volume (1 K ohm) Volume + (2.2 K ohm) Program- (3.9 K ohm) Program+ (6.2 K ohm) MENU (9.1 Kohm) TV/DVD (13.8 Kohm) AV/TV(22 Kohm) Analog (37.4 Kohm) OK (86.5 K ohm) SELECTED BAND NOT USED VHF-L VHF-H UHF
KEYBOARD INPUT LEVEL (Pin56)
Note:The pull up resistor of Pin56 is 10K. TV/AV SELECTION (Pin11/Pin12) S0-Pin11 S1-Pin12 TV/AV MODE STD-BY (Pin 6) 0 1 0 0 TV 1 0 AV1/RGB 0 1 AV2 1 1 S-VHS
STANDBY OUTPUT (Pin6) Mode Standby Operating
2. STV2246H
The STV224XH is fully bus-controlled IC for TV that include PIF, SIF, Luma, Chroma and Deflection processing functions. Used with a vertical frame booster (TDA8174A for a 90° chassis, STV9306 for a 110° chassis), they allow multi-standard (BG/DK/I/MN/LL', PAL/SECAM/NTSC) sets to be designed with very few external components and no manual adjustments.
2.1 Main features
I²C Bus Control PIF Circuit with PLL Demodulation (Positive and Negative Video) SIF Circuit with QSS Structure, FM Demodulation and AM Demodulation for France Intercarrier Capability and Built-in Sound Band pass Sound Subcarrier Output for Stereo Chassis (FM, NICAM) Integrated Chroma Filters and Luma Delay Line and Integrated Chroma Delay Line 3 channels input Video Switch and 2 channels CVBS output OSD RGB Inputs and external RGB Inputs Interface PAL/SECAM/NTSC Chroma Demodulators Black Stretch and peaking Circuit -5-
Automatic Cut-off Current Loop, manual Cut-off possible for low-cost applications Two Horizontal Deflection PLLs APR (Automatic RGB Peak Regulation) or RGB Peak Limitation Function
2.2 Pin description
PIN NO. 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 29 30 31 32 33 34 35 36 37 38 39 40 SYMBOL SIFIN1 SIFIN2 AGCSIFCAP VREFIF AGCPIFCAP PIFIN1 PININ2 TUNERAGCOUT IFPLL GNDIF AM/FMOUT/SC VCCIF INTCVBSOUT EXTAUDIOIN PIFLC1 PIFLC2 VCC2 CVBSIN1 GND2 CVBSIN2 BS Y/CVBSIN3 CHR APR BEXT/Cb GEXT/Y REXT/Cr FBEXT NC/CVBSOUT1 BOUT GOUT ROUT ICATH BOSD GOSD ROSD FBOSD/HC XTAL3/BTUN XTAL2 XTAL1 SIF input SIF input AGC SIF capacitor Voltage reference filter AGC PIF capacitor PIF input PIF input AGC Tuner output IF PLL filter IF Ground AM/FM Mono sound or stereo carriers output 5V IF Supply Internal CVBS output External audio input LC input LC input Video/LUMA Supply voltage (8V) Internal video input Video/LUMA ground External video input Black stretch capacitor Y(SVHS) or CVBS3 external input Chroma(SVHS) input Automatic RGB peak regulation External blue input or Cb input External green input or Y input External red input or Cr input External fast blanking input Not connected or CVBS output1 Blue output Green output Red output Cathode current measurement input OSD Blue input OSD Green input OSD Red input OSD Fast blanking input/half contrast 3.5x MHz Crystal or bell filter tuning capacitor 3.5x MHz Crystal 4.43/3.5x MHz Crystal -6DESCRIPTION
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
CLPF X1/VAMP/CHROUT GND1 CVBSOUT2 VCC1 BCL/SAF VERT HOUT LFB/SSC SLPF SCL SDA VCCD GNDD AUDIOOUT FMCAP
Chroma PLL filter XTAL1 control pin, vertical amplitude DAC output and chroma reference signal output Chroma/scanning ground Second video switch output Chroma/scanning power supply (8V) Beam current limiter control voltage and safety input(X-ray) Vertical output pulse Horizontal output pulse Line flyback input and super-sandcastle output Scanning PLL filter I2C Bus clock input I2C Bus data input Digital supply voltage(5V) Digital ground Main audio output FM demodulation capacitor
2.3 Block diagram
3. TDA8174A
The TDA8174A are a monolithic integrated circuits It is a full performance and very efficient vertical deflection circuit intended for direct drive of a TV picture tube in Color and B & W television as well as in Monitor and Data displays -7-
3.1 Main features
Ramp generator Independent amplitude adjustement Buffer stage Power amplifier Flyback generator Thermal protection Internal reference voltage decoupling
3.2 Pin description
3.3 Block diagram
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. STV8216
This chip included three main parts: TV Sound Demodulator: provides all the necessary circuitry for the demodulation of audio transmissions of European and Asian terrestrial TV broadcasts. The various transmission standards are automatically detected and demodulated without user intervention. Audio Processor: based on DSP technology independently controls loudspeaker, subwoofer and headphone signals. It offers basic and advanced features, such as a ST Wide Surround, Equalizer, Automatic Loudness and Smart Volume Control for television viewer comfort. The STV8226/36 versions can perform additionally the SRS 3D Surround for stereo and mono signals. Audio Matrix: 3 stereo and 1 mono external analog audio inputs to loudspeakers and headphone, with 2 stereo external analog audio outputs (SCART compatible).
5.1 Main features
NICAM, AM, FM Mono and FM 2 carrier stereo demodulators for all sound carriers between 4.5 and 7MHz Mono input provided for optimum AM demodulation performances Demodulation controlled by automatic standard recognition system Sound IF AGC with wide range, over modulation and carrier offset recovery, Smart volume control, smart volume control, 5-band equalizer bass/treble control, automatic loudness control Loudspeaker and Headphone outputs with volume/balance controls and beeper Subwoofer output with volume control and programmable bandwidth, spatial Sound Effects (ST Wide Surround and Pseudo-Stereo), low-noise audio mutes and switches I²C Bus-controlled, single and standard 27 MHz crystal oscillator, Power supplies: 3.3V Digital, 5V or 8V Analog, embedded 3.3V regulators
5.2 Pin description
Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 SYMBOL SIF VTOP VREF IF VDDIF GNDIF MONOIN AO1L AO1R VDDC GNDC AI1L AI1R VMC1 VMC2 AI2L AI2R VDDA Pin TYPE Analog Analog Analog Analog power supply Analog power supply Analog Analog Analog Analog power supply Analog power supply Analog Analog Analog Analog Analog Analog Analog power supply DESCRIPTION Sound IF input ADC VTOP decoupling pin AGC Voltage reference decoupling Pin 3.3V Power supply for IF AGC & ADC Ground for IF AGC & ADC Mono Input Left SCART1 audio output Right SCART1 audio output 3.3V Power supply for audio DAC/ADC Ground for audio DAC/ADC Left SCART1 audio input Right SCART1 audio input Switched VREF decoupling Pin for audio converters (VMCP) VREF decoupling Pin for audio converters (VMC) Left SCART2 audio input Right SCART2 audio input 3.3 V power supply for audio buffers, matrix & bias -10-
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
GNDAH AO2L AO2R VDDH VREFA AI3L AI3R BGAP LSL LSR SW HPL HPR GNDSA HPD ADR SCL SDA REG RESET SYSCK MCK VDD1 GND1 GNDSP XTI XTO VDDP GNDP GND2 VDD2 CKTST SDO ST/SDI WS SCK BUS1 BUS0 IRQ
Analog power supply Analog Analog Analog power supply Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog power supply Bidirectional Input Open drain Open drain Analog Input Bidirectional Bidirectional Digital power supply Digital power supply Analog power supply Input Output Analog power supply Analog power supply Digital power supply Digital power supply Input Bidirectional Bidirectional Bidirectional Bidirectional Bidirectional Bidirectional Bidirectional
Ground for audio buffers and SCART Left SCART2 Audio output Right SCART2 Audio output 8V/5V power supply for SCART and audio buffers Voltage reference for audio buffers Left SCART3 audio input Right SCART3 audio input Bandgap voltage source decoupling Left loudspeaker output Right loudspeaker output Subwoofer output Left headphone output Right headphone output Substrate analog/digital shield Headphone detection input (active low) Hardware I²C chip address control I²C serial clock I²C serial data 5V power regulator control Hardware reset (active low) System clock output I²S master clock output 3.3V Power supply for digital core & IO cells Ground for digital core & IO cells Substrate analog/digital shield for clock-PLL Crystal oscillator Input Crystal oscillator output 3.3V power supply for analog PLL clock Ground for analog PLL clock Ground for digital core, DSPs & IO cells 3.3V power supply for digital core, DSPs & IO cells Must be connected to ground I²S bus data output Stereo detection output / I²S bus data input I²S bus word select output I²S bus clock output I²C bus expander output1 I²C bus expander output2 I²C status read request
5.3 Block diagram
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CHASSIS BLOCK DIAGRAM
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SERVICE MODE&ADJUSTMENT
The Service-1 mode is entered by pressing the "SERVICE" key on remote control when the TV is in ON condition and not in any Menu mode. In service mode, by pressing "OK" key, Service-2 is accessed. by pressing "OK" key again, Serivice-3 is accessed. By pressing "PP" key, exit Service mode.
6.1 WHITE BALANCE ADJUSTMENT
The items within the Service-1 mode can be accessed using P+/P- keys and the selected item can be modified by using V+/V- keys. The parameters controlled in the Service-1 menu are : a) Red Gain ( 0 ... 63 ) b) DC Red ( 0 .... 127) c) Green Gain ( 0 .... 63) d) DC Green ( 0 .... 127) e) Blue Gain ( 0 .... 63) f) DC Blue ( 0 .... 127) g) APR_threshold (0....15) h) LOGO ( the first show the length of logo, and the followed is the logo) i) R-Cutoff (0...63) j) G-Cutoff (0...63) The display of Service-1 menu is showed as follows:
6.2 VIF ADJUSTMENT
When in Service-1 menu ,if "OK" key is pressed , Service-2 menu appears and the display is as follows.The parameters controlled in the Service-2 menu are : a) Tuner AGC ( 0 ... 63 ) b) Horizontal position 50 Hz( 0 ... 63) c) Vertical position 50 Hz (0...15) d) Vertical amplitude 50Hz (0...63) e) Vertical linearity 50Hz (0...63) f) Horizontal position 60 Hz( 0 ... 63) g) Vertical position 60 Hz (0...15) h) Vertical amplitude 60 Hz (0...63) i) Vertical linearity 60 Hz (0...63) j) Sub-Bright Maximum (0...63) k) Sub-Bright Minimum (0...63) l) Sub Tint (0...63) -13-
m) VCO Coarse ( 0 ... 15) n) VCO Fine ( 0 ... 127 ) o) VCO Coarse L1( 0 ... 15) p) VCO Fine L1( 0 ... 127 ) The display of Service-2 menu is showed as shown: The VCO status bar at the bottom of the screen appears only if either VCO Coarse item or VCO Fine item is selected. The VCO status is read from the Read register of STV223X/4X and guides whether to Increase / Decrease the VCO registers to attain VCO OK Status. For doing VCO adjustment , Feed a 38.9MHZ Carrier as IF input and adjust VCO Coarse and fine parameters to get VCO OK Status. If the cursor is in VCO Coarse or Fine, and the display shows VCO OK status, then pressing of AV" key will automatically put VCO fine to the Centre of the +60 to -60 KHz window. For doing VCO L1 adjustment ,Feed a 33.9 MHZ carrier as IF input and adjust VCO Coarse L1 and VCO Fine L1 to get VCO OK Status. If the cursor is in VCO Coarse L1 or Fine L1 , and the display shows VCO OK status, then pressing of "AV" key will automatically put VCO fine for L1 to the Centre of the +60 to -60 KHz window. Another fast way of adjustment of VCO is to put the selection bar to either VCO Coarse or fine and press the "AV" key. The VCO adjustment is done automatically. Similarly if you put the selection bar to VCO Coarse L1 or Fine L1 and press the "AV" key , the VCO L1 adjustment will be done automatically. NOTE:Below items are not used in this chassis: Vertical position 50 Hz Vertical amplitude 50Hz Vertical linearity 50Hz Vertical position 60 Hz Vertical amplitude 60 Hz Vertical linearity 60 Hz
6.4 DESIGN OPTION SETTING
When in Service-3 menu, if "OK" key is pressed, Option menu appears and the display is as follows:
OPTION1 b7 = Over modulation (0=Disable, 1=Enable, it's suggested to set it to 0 normally.) -14-
b5 = P/N/S crystals application (0=2 Crystals, 1= 1 Crystals, according the quantity of crystal used for color decoding in chassis.) b4 = Cutoff Loop (0= OFF, 1=ON, it's suggested to set it to 1 normally) b3 = Safety Reset (0=Active, 1=Non, it's suggested to set it to 0 normally) b2 = MONO IN (0 = OFF, 1= ON, Depend on the sound decoding solution used in chassis. ) b1 = Sound Demodulation (0 = Intercarrier/MONO, 1 =QSS/NICAM, depend on the sound decoding solution used in chassis.) b0 = logo display (0 =OFF, 1= ON, it's suggested to set it to 0 normally.) OPTION2 (set to 0 by default) b5 = HALF_CONTRAST (0 = OFF, 1=ON) b4 = Color 6dB (0 = OFF, 1 = ON) b3 = APR Feature (0 = ON, 1= OFF) b2 = Black Stretch (0 = ON, 1= OFF) b1 = Auto Flesh (0 = ON, 1= OFF) b0 = Coring (0 = ON, 1 = OFF) OPTION3 b7 =SMART (0 = OFF, 1=ON, it's suggested to set it to 1 normally) b5 = AVL (0 = OFF, 1=ON, it's suggested to set it to 0 normally.) b4 = PIF overmodulation (0 = OFF, 1= ON, it's suggested to set it to 0 normally.) b3 = Market_France --- secam LL (0 = OFF, 1 = ON, depend on the solution of chassis.) b2 = Manual/Auto cutoff (0 = Manual, 1 = Auto cutoff, depend on the CRT for chassis.) b1 = Mute pin low/high to control the mute of speaker (0 = low, 1 = high, depend on the solution of chassis.) OPTION4 b6 = WIDE MODE (0 = OFF, 1=ON, it's suggested to set it to 0 normally.) b4 = SCART2 (0 = OFF, 1=ON, depend on the solution of chassis.) b3 = RGB (0 = OFF, 1= ON, depend on the solution of chassis.) b2 = SVHS (0 = OFF, 1= ON, depend on the solution of chassis.) b1 = AV2 (0 = OFF, 1= ON, depend on the solution of chassis.) b0 = AV1 (0 = OFF, 1= ON, depend on the solution of chassis.) OPTION5 There are 8 bits used in OPTION 5. They are b0, b1, b2, b3, b4, b5, b6 and b7. For b0, normally, ST suggests to set it to 0. For b1, b2, they are used to select teletext languages. For b3, it's used to enable AV3 and SVHS. When b3 is set to 0, SVHS is enabled. When b3 is set to 1 in binary, the value is 8 in decimal. AV3 is enabled. For b4, b5, b6 and b7 of OPTION 5 are also used to set the brightness of background in teletext mode. When b4 b5 b6 and b7 are all set to 0, the brightness of teletext background is the same as brightness of TV background. When b4, b5, b6 and b7 are all set to 1, it's the maximum brightness of teletext background. It's the minimum brightness of teletext background when b4 is set to 1, and b5, b6 and b7 are all set to 0. you can set these 4 bits according to your favorite brightness of teletext background. A. for 11 OSD languages CPU ST92195C7B1/MNS for east Europe, the setting of the b1 and b2 is listed as below. 1. If b1 = b2 = 0, then the TEXT languages like "ENGLISH, FRENCH, SWEDISH, CZECH, GERMAN, PORTUGUESE (SPANISH), ITALIAN, RUMANIAN" can be decoded; 2. If b1=1, b2=0, then the TEXT languages like "ENGLISH, RUSSIAN (BULGARIAN), HUNGARIAN, TURKISH, GERMAN, PORTUGUESE (SPANISH), ITALIAN, RUMANIAN" can be decoded. -15-
3. If b1=0, b2=1, then the TEXT languages like "POLISH, RUSSIAN (BULGARIAN), SWEDISH, SLOVAK, GERMAN, SLOVENIAN, LITHUANIAN, RUMANIAN" can be decoded. 4. If b1 = b2 =1, then the TEXT languages like "POLISH, RUSSIAN (BULGARIAN), SWEDISH, CZECH, GERMAN, CROATIAN, LETTISH, RUMANIAN" can be decoded. B. for 12 OSD languages CPU ST92195C7B1/MNU and ST92195C7B1/MOK (SHRINK VERSION) for Western Europe, the setting of the b1 and b2 is as below. 1. If b1 = b2 = 0, then the TEXT languages like "ENGLISH, FRENCH, FINNISH, CZECH, GERMAN, PORTUGUESE (SPANISH), ITALIAN, GREEK" can be decoded; 2. If b1=1, b2=0, then the TEXT languages like "ENGLISH, FRENCH, DANISH, NORWEGIAN, GERMAN, PORTUGUESE (SPANISH), ITALIAN, GREEK" can be decoded. 3. If b1=0, b2=1, then the TEXT languages like "POLISH, FRENCH, SWEDISH, CZECH, HOLLAND, SERBIAN, ITALIAN, RUMANIAN" can be decoded. 4. If b1 = b2 =1, then the TEXT languages like "POLISH, FRENCH, SWEDISH, CZECH, GERMAN, PORTUGUESE (SPANISH), LETTISH, RUMANIAN" can be decoded. ST Text b0 is used to change the process for adjusting Auto gain. 1) When CPU ST92195C7B1/MOK is used, the b0 is suggested to set to 0, the gain table for shrink version should be selected. 2) When CPU ST92195C7B1/MNU is used, the b0 is suggested to set to 1, the gain table for normal version will be selected. b1, b2, b3 = select the correct process, only for ST engineer adjustment. ROM_M6_P_valid | OSDEPROM_M6_R_valid | ROM_M6_R_valid | EPROM_M6_R_valid EPROM_M6_R_valid | ROMLESS_H5_P_valid | ROM_H5_P_valid | EPROM_M6_A_valid /* note: ROMLESS_M6_R_valid == ROM_M6_R_valid*/ b4 = Color transition for SVHS of STV224XX (0 = b5 is available, 1 = b5 is not available, and "SHARPNESS" is no feature.) b5 = (0 = STV224XH, 1 = STV224XC/D/E). b6 = Tuner Drift Correction (0 = OFF, 1 = ON.) b7 = RGB/DVD display on screen (0 = RGB, 1 = DVD.) HPOS OSD, Adjust horizontal position of OSD. VPOS OSD, Adjust vertical position of OSD. HPOS TXT, Adjust horizontal position of teletext. VPOS TXT, Adjust vertical position of teletext. HOTEL MODE, To set HOTEL MODE ON or OFF. When HOTEL MODE is enabled. The end user can not make any adjustment of items in menu INSTALL, AUDIO and ORGANIZE. Menu INSTALL and AUDIO will disappear automatically. Volume Limit, To set maximum volume of HOTEL MODE. It's only available when HOTEL MODE is enabled. SndSt 1 b0, b1, b2, b3 of SndSt 1 are used to set the sound output level at pin 26 and pin 27 of STV8216 with RF signal. When b0, b1, b2, b3 of SndSt 1 are all set 0, the minimum sound output level will be got at pin 26 and -16-
pin 27 of STV8216 with RF signal. When b0, b1, b2, b3 of SndSt 1 are all set 1, it's 15 in decimal. The maximum sound output level will be got at pin 26 and pin 27 of STV8216 with RF signal. b4, b5, b6, b7 of SndSt 1 are used to set the "SURROUND" gain at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are all set 0, the minimum "SURROUND" gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are all set 1, it's 240 in decimal. The maximum "SURROUND" gain will be got at pin 26 and pin 27 of STV8216 with RF signal. SndSt 2 b0, b2, b2, b3 of SndSt 2 are used to set the sound output level at pin 26 and pin 27 of STV8216 with AV signal. When b0, b2, b2, b3 of SndSt 1 are all set 0, the minimum sound output level will be got at pin 26 and pin 27 of STV8216 with AV signal. When b0, b2, b2, b3 of SndSt 1 are all set 1, it's 15 in decimal. The maximum sound output level will be got at pin 26 and pin 27 of STV8216 with AV signal. b4, b5, b6, b7 of SndSt 2 are used to set the "EQUALIZER" gain at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are all set 0, the maximum "EQUALIZER" gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal. When b4, b5, b6, b7 of SndSt 1 are all set 1, it's 240 in decimal. The minimum "EQUALIZER" gain will be got at pin 26 and pin 27 of STV8216 with RF & AV signal. LL1 MAGC, Just for SECAM LL1 SIF AGC setting purpose in STV8216. No available for PAL and NTSC system. When the item "LL1 MAGC" is set to OFF, the SIF AGC of STV8216 is set by software. When the item "LL1 MAGC" is set to ON, the SIF AGC of STV8216 can be set manually. The following steps can be followed when set this item. 1) To get a RF SECAM LL1 signal without sound modulation, only sound carrier is available. And put the signal to input of tuner in CTV 5 chassis. 2) To press "SERVICE" key on remote control to enter service menu. And select the item "LL1 MAGC" by P+ or P- key on remote control. Set the item "LL1 MAGC" from "OFF" to "ON" by V+ or V- key on remote control. service command, 1) "PP"----exit 2) "OK"---- switch between the service menu 3) "AV"---- auto VCO adjust 4) "MUTE" ---- one line gain Enter service menu with user remote control, 1) Press key "Sleep" on remote control to set sleep time to "00:50". 2) Within 5 seconds, press local key "V+" in TV set to enter service menu. 3) Adjust expecting item as the same as service remote control.
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TEST POINT WAVE FORM&SCHEMATIC DIAGRAM
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C601 0.22uF/250VAC R106 2K7/s
3 6
R170 1/6W 510
T3.15A
R107 2K7/s
L101 10uH
1 8
D606 1N4007
5K6 R611
R623 MTZ11C(11V) 2K7 R617 3K3 ZD601 D616 1S1555 ES1/RGP10G D617
R626 2K7
R622
C617 22n/M
2
C126 22pF/s
R133
R132
IF C641
G ND
100uF 160V VR631
22K R618 AO1R 12K/2W
2
C228
R608
SIF IN1 SIF IN2
R653 1K/0.5W
FM CAP
1uF 50V R112 AUDIO OUT
AUDIO OUT GNDD
10K
AGC(S)CAP
C205 50V/1uF
SDA SCL AIL1
Vrefif
C206 1uF 50V
VCCD
R251
BCL AIR1
AGC(P)CAP
SDA SCL
100 R252 100 C810 4n7/s HS C255 AI2L FLYB AI2R D251 1N4148 HD C813 R803 C809
PIF IN1
0.22uF 50V ON/OFF
C254
PIF IN2 RAGC OUT
TUNER AGC C209 R212 0.33uF/s 150/s
SLPF
R253
15K/s 2.2uF 50V
LFB/SSC H OUT
R254 2K2
IF PLL
G ND G ND
IF GND
VERT
4.7uF 50V
VD AOL2
AM/FM OUT/SC
SIF OUT
VS AOR2
BCL/SAF IF VCC VCC1
C257 0.1uF C213 C212 47uF 16V
+8V V OUT
CVBS OUT
CVBS OUT1
470uF 16V R276
CVBS.TXT 0.1uF/s CVBS OUT
EXT AUDIO IN
BSW1
GND1
L252 1uH
BSW2
PIFIC1 X1/VAMP/CHROUT
C263 4n7/s C268 0.1uF/M
VAMP
PIFLC2
CJPF
R268 27K/s
VCC2 CVBS IN1
XTAL1
X201 0.22uF/s 4.43MHz X202 3.58MHz
XTAL2
C4 28 47P
GND2
XTAL3/BTUN LSR HPR FBOSD/HC
R266 FB 47K/s R269 1K/s R263 1K/s R262 1K/s R261 B G SDA AO1L AI1R AO1R SCL
C4 24 1uF 5 0V
V IN1
0.1uF/s
L412
CVBS IN2
VT TUNER AGC V IN2
L411 C4 27 47P
BS
ROSD
R
1K R265
Y/CVBS IN3 CHR
GOSD
1K R264
IF
BOSD
1K
Text
ICATH
47K/s R274
BEXT/UEXT GEXT/YEXT
ROUT
R729
GOUT BOUT
REXT/VEXT
FBEXT
NC
47uF 16V MUTE
R216 27K/s 1uF 50V
G ND 1 INP UT
HD R705 3.3K 1uF 50V
1
POWER C516
1
VCC2
V.SYNC IN R516 R330
2
V AMP
330/2W
0.22uF 250V M
1
GND C326 1000uF 35V BC R510 Vout 100
VP D301 VCC1 1N4007 FLYV
2
4 2
5 7
X101
SIF
SIF VTOP
IRQ
BUS0
V IN2
VREFIP
BUS1
CVBS OUT
VDDIF
SCK
GNDIF
ADIO OUT 1uF 50V AO1L
WS
+8V
MONOIN
ST/SDI
AO1L
SDO
AOIR
SKDST VDD2
SCART2 ID
VDCC
GNDC
GND2
AI2L
AI1L
GNDP
AI1R
VDDP
AOL2
VMC1 VMC2
XTO
AI2R AOR2
1uF 5 0V C4 09 1uF 5 0V
XTI GNDSP
AI2L
AI2R
GND1
L802 10uH
330
VDDA GNDAH
VDD1
V IN1 V OUT
MCK
AO2L
C814
SYSCK
FBI
AO2R
RESET
D 801
RI
VDDH
REG
VREPA
10uF 16V
SDA
GI
AI3L
SCL
AI3R BGAP
ADR
SCART1 ID
HPD
BI AI1L
C4 14
330P C415-C422
LSL
1uF 5 0V
GNDSA
SW
HPL
C4 13 1uF 5 0V C4 23
1000uF25V 1E/2W
V CC
4.7K
1 OU T +
G ND
1 OU T -
STA ND BY
2 INP UT
V OLU ME
2 OU T -
G ND
2 OU T +
R522
2
10K/2W
680P 1N4007 D508 R519 1K2/0.5W
100
R523
2
C511
1
10K/2W
680P 1N4007 D504
R513 1K2/0.5W
C517
1
680P 1N4007 D501 R502 100 R501 1K2/0.5W
R526 22E
C521 4700pF 2KV