L5A TFT- LCD TV SERVICE MANUAL
CONTENTS PAGES Safety instructions 1 Technical specifications 2 Panel Specification 3 Chassis block diagram 4 Scaler block diagram 5 Block diagram of power supply 6 Chassis overwiev 7 Service mode items and explanations 12 Data sheet of important IC’s 17 Recommended Part List 29 Frequency list of channels 30
SAFETY PRECAUTIONS GENERAL GUIDELINES 1. Always use the manufacturer’s replacement safety components. The critical safety components marked with on the schematics diagrams should not be by other substitutes. Other substitute may create the electrical shock , fire or other hazards. Take attention to replace the spacers with the originals. Furthermore where a short circuit has occurred , replace those components that indicate evidence of overheating. 2.
L5A TECHNICAL SPECIFICATION PAL B/G+I+D/K SECAM L/L' Receiving System Comb Filter Adaptive 4H\2H Scaling Upto SXGA at 75Hz Gamma Correction 8 to 10-bit LUT Histogram Equalization Stereo Decoding (German A2, Nicam, BTSC) Stereo L, R In YES German A2, Nicam 3 Stereo L, R Out 3 Audio Output Power RMS in Max at 10% THD) Teletext 2x3W, 2x5W for 22"W Level (1.5, 2.5, Teleweb) Teletext 1.
PANEL SPECIFICATION 14" 15" Manufacturer 17W" 20" 22W" AUO Samsung Hannstar Samsung CMO AUO Sanyo Samsung CMO AUO Samsung Interface Single LVDS Double TTL\Single LVDS Dual LVDS Single LVDS Single TTL\Single LVDS Single LVDS Single LVDS Resolution VGA (640x480) XGA (1024x768) SXGA (1280x1024) WXGA (1280x768) SVGA (800x600) VGA (640x480) WXGA (1280x720) WXGA (1280x768) Brightness (cd/m2)> 450 250 300 400 500 450 450 Contrast> 500 300 400 400 500 500 400 Response Time
BLOCK DIAGRAM OF MAIN CHASSIS (L5A) SVHS-Y/C Tuner IF SC1-RGB YUV YUV CVBS-IF Video Decoder VPC 3230D Scaler Stage HS/VS PANEL HS/VS HS/VS RGB FB RGB CVBS HS/VS VGA-IN EEPROM 24LC16 Teletext Decoder SDA 5550 K6T1008V2E SRAM (Optional) M29W040 Flash Memory L R MSP3410G AUDIO L DECODER R R L R SIF/AM-mono Scart 1 Scart 2 SVHS/FAV TDA1571 Stereo Amplifier TDA1308 Headphone Amplifier EEPROM 24LC02
BLOCK DIAGRAM OF SCALER BAC LIGHT UNIT S508 (LVDS) S500(TTL) BR1_ADJ Panel_En Standby Mute Reset BLK_EN HS/VS RGB LVDS CONNECTOR (20 OR 30 PINS) (S503,S502) GM 5221 U500 LCD CONTROLLER VGA_RGB VGA HS/VS S506 CONN. U501 PARALEL FLASH MEMORY M29W040B (OPTIONAL) U503 SERIAL FLASH MEMORY M25P40 S505 PROGRAMING CON KEYBOARD CON.
L5A POWER SUPPLY BLOCK DIAGRAM S600 DC Jack F600 +15V-STBY 15V,12V LM2576 U600 S602 LM1117 3.3V V-INV LM2576 U607 +5V-STBY LM1117 1.8V U605 Fuse 5A F601 V-INV V-INV 78L08 U606 3.3V-STBY 1.8V-STBY +8V 2.5V +5V INPUT: 12V FOR 14,15,17 INCH 15V FOR 20, 22 INCH 24V FOR 23 INCH 5V-STBY 78L12 U608 + 12V U602 SDI9933ADY +12V ONLY FOR 23 " ONLY FOR 20, 22, 23 " PNL-EN Power STBY 78L08 U606 +8V LM117-3.3V U604 Panel Power 3.
L5-A Low-to-Mid End LCD-TV BOARD OVERVIEW L5-A Low-to-Mid End LCD TV board incorporates the LCD Controller gm2221, to create a high quality, stand-alone LCD-based TV system for consumer applications. Figure 1 illustrates the Block diagram of the board. This board supposed to have two versions: 1. Low-End (to drive 14''-15’’ 4:3 panels) 2.
On the board, one high quality video decoder (U100) is provided (VPC3230D of Micronas) to process video inputs coming from the video sources. The video processor can process 3 composite video inputs and 1 S-Cideo input from the NTSC/PAL video sources. The CVBS output recovered from the tuner module is made available to one of the video inputs of the video decoder. The digitized video output (in ITU-656 format) from U100 is fed to the dedicated video Port of gm2221 for decoding and processing.
A keypad connector (S507) is provided which utilizes the integrated low bandwidth ADC in gm2221 for scanning 5-6 keys (menu,V+,V-,P+,P- keys standard- source key optional) on the keypad. The keypad allows access to the OSD without using the remote IR controller. The L5-A board also has In System Programming (ISP) capability for the external flash ROM using DDC2Bi. This can be done using the D-Sub 15 (PC) connector on the board. ISP can also be performed using G-probe through the RS232 interface.
4. GM2221 LCD TV CONTROLLER The gm2221 IC is a highly integrated single channel scaler that can be used for both LCD monitors up to SXGA/UXGA resolutions and rear projection systems with DLP and HTPS LCD engines up to 1280x720 (720P). Some of the key features include: • Single processing channel. • RGB and YUV signal processing with RGB to YUV and YUV to RGB color space converters. • Video signal processing/de-interlacing using spatial, VT (vertical-temporal) diagonal interpolation.
L5A SERVICE MENU Service Menu is entered by pressing 9, 3, 0, 1 keys on the remote controller when the Picture icon is highlighted in the Main Menu. Service Menu has 3 sub-menus. These are: • Options • Adjustments • Selections. Navigation through these menus can be done by pressing OK button. Every adjustment made in this menu is saved automatically. OPTIONS Options are adjustments that the user can select On or Off.
STAND BY If this Option is OFF, the TV will stay in Stand By mode after a Power On. If this Option is ON, the TV will recall its last stand by status before the Power Off, and switch on from Stand By automatically, if the last state was ‘Stand by On’. MSP CARRIER MUTE If this option is ON, sound processor’s carrier mute functionality will be enabled. The MSP will mute the sound automatically if the signal quality is bad. Setting this option Off will disable this functionality.
SELECTIONS This sub-menu contains selections. • TUNER TYPE SAMSUNG / PHILIPS • TELETEXT NO TEXT / FAST / FAST&TOP • MSP CLIP REDUCE VOL / REDUCE TONE / COMPROMISE / DYNAMIC TUNER TYPE One of two supported tuner can be selected from this item. System must be restarted for this change to take effect. TELETEXT NO TEXT: Teletext is totally disabled. TXT/MIX button will not be functional. AUTO picture format mode will be disabled in RF, F-AV and SHVS modes.
NORWAY BG POLAND DK PORTUGAL BG SPAIN BG SWEDEN BG SWITZERLAND BG + L TURKEY BG UNITED KINGDOM I For countries France, Belgium and Switzerland, autoprogramming is done twice. For Belgium and Switzerland, first BG channels will be searched, after the search in BG is done, searching will restart for L standard. If the selected country is France, the sequence of standards is reversed, thus, first L then BG.
OPTIONS/ VALUES DEFAULT VALUES OR SETUP BG ON/OFF ON DK ON/OFF ON I ON/OFF ON LL' ON/OFF ON SCART 2 ON/OFF OFF FAV ON/OFF ON SVHS ON/OFF ON HOTEL MODE ON/OFF OFF STBY ON/OFF OFF MSP CARRİER MUTE ON/OFF OFF WSS SCART ON/OFF ON FIRST ATS ON/OFF OFF BACKLIGHT POL ON/OFF OFF FACTORY MODE ON/OFF OFF WHITE R 0-255 128 WHITE G 0-255 128 WHITE B 0-255 128 PRESCALE FM 0-127 37 PRESCALE NICAM 0-127 63 PRESCALE SCART 0-127 27 HOTEL VOLUME 0-63 16 AGC 0-
GENESIS GM5221 LCD TV CONTROLLER The gm5221 is an LCD TV controller supporting resolutions up to SXGA (1280x1024). The gm5221 leverages Genesis patented advanced image-processing technology as well as a proven integrated ADC/PLL and an Ultra-Reliable DVI™ compliant digital receiver to provide excellent image quality. gm5221 also integrates a microcontroller, an OSD controller, advanced color management and dual LVDS transmitters. 1.
1.2 gm5221 Family Features • Intelligent Image Processing™ • • • • • • • • Ultra-Reliable DVI-Compliant Input Port • • • • • • • Supporting NTSC / PAL interlaced and progressive Direct connect to commercially available video decoders Spatial de-interlacing Advanced Color Management • • • Programmable gamma correction (CLUT) TV color controls including hue and saturation controls Full color matrix allows end-users to experience the same colors as viewed on CRTs and other displays (e.g.
2 gm5221 Pinout 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 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 45 46 47 48 49 50 51 52 N/C N/C DCLK JTAG_RESET RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED JTAG_TDO RESERVED JTAG_TDI PPWR PBIAS GPIO15 RESERVED HOST_SCL/UART_DI HOST_SDA/UART_DO RVDD_3.
C7 C6 C5 C4 VSUPC GNDC C3 C2 C1 C0 GNDSY VSUPSY INTLC AVO FSY/HC MSY/HS VS FPDAT VSTBY CLK5 NC XTAL1 XTAL2 ASGF Video Processing - VPC3230D 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 GNDF VRT I2CSEL ISGND VSUPF VOUT CIN VIN1 VIN2 VIN3 65 66 40 39 67 68 38 37 69 36 70 71 35 34 72 73 33 32 VPC3230D 76 77 29 28 FB1IN 78 79 27 26 AISGND 80 25 FFOE CLK20 FFRE FFWE FFRSTW 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 YCOEQ FFIE 7 8 V
Video Processing - VPC3230D 1. Features Video Decoding - 4 Composite inputs, 1 S-VHS input - Composite video & sync output - integrated high-quality A/D converters - Adaptive 2H comb filter Y/C separator - 1H NTSC comb filter - Multi-standard color decoder(1 Crystal) - Multi-standard sync decoder - Black line detector Video Decoding - Horizontal scaling(0.
Block Diagram CIN1 VIN1 Adaptive Comb Filter Analog Front End Color Decoder VIN2 NTSC, PAL, SECAL VIN3 VIN4 AGC, 2*ADC FB RGB/ YCbCr Y/G ANALOG Component Front-End Saturation Tint MIXER 2D Scaler PIP Panorama Mode Contrast Brightness Peaking Output Formatter U/B ITU-R 656 ITU-R 601 YCOE Memory Control FIFO CNTL Y LL Clock FB Cr Matrix Contrast Saturation Brightness Tint SYNC + Clock Generation Cb FB Y OUT CrCb OUT I2C BUS V/R 4 x ADC Processing Cr Cb NTSC PAL VOUT RGB/ YCbC
Video Processing - VPC3230D Pin Pin Name No. Type Short Description Pin No.
Video Processing - VPC3230D Pin Pin Name No.
NC NC AHVSS AHVSS AGNDC NC SC4_IN_L SC4_IN_R ASG4 SC3_IN_L SC3_IN_R ASG2 SC2_IN_L SC2_IN_R ASG1 SC1_IN_L SC1_IN_R VREFTOP NC MONO_IN AVSS AVSS NC NC Audio Processing - MSP3440G 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 AVSUP AVSUP 65 66 40 39 CAPL_M AHVSUP ANA_IN1+ 67 68 38 37 CAPL_A SC1_OUT_L 69 70 36 35 SC1_OUT_R 71 72 34 33 SC2_OUT_L ANA_INANA_IN2+ TESTEN XTAL_IN XTAL_OUT TP MSP3410D AUD_CL_OUT NC 74 32 31 75 30 NC D_CTR_I/O_1 7
Audio Processing - MSP3410D Pin Pin Name No. 1 NC 2 I2C_CL 3 Type Short Description Pin Pin Name No.
Audio Processing - MSP3440G Pin Pin Name No. Type Short Description Pin Pin Name No. Short Description Type 51 GND SY SUPPLYD Ground, Sync Pad Circuitry 72 XTAL_OUT OUT Crystal oscillator 52 V SUPSY SUPPLYD Supply Voltage, Sync Pad Circuitry 73 TP Test pin 53 INTLC OUT Interlace Output 74 AUD_CL_OUT OUT Audio clock output(18.
SDA5550 MICROCONTROLLER BLOCK DIAGRAM
L5A SPARE PART LIST POSITION F600 IR1 MENU S602 TU201 U100 U301 U304 U400 U401 U402 U403 U500 U502 U600 U602 U603 U604 U605 Y100 Y300 Y400 Y500 BEKO CODE 056T14-AU1 056T20-AU1 8R9107-AS 8R9850-00A 8R9953 Y48120 Y48121 Y48913 Y92913 ZC5850-00A ZF9110 ZF9187F ZG4110 ZG4255-01 ZH1183-CH1 ZH6183-AU3 054290 452521-01 010844 ZC5502-AS Y56502-AS ZC5513-AS 8R9100-AS 031274 8R8138-PH1 452937 453013 452662-02 453010 453026 453021 452706-01 453296 452662-02 453294 401372 453124 453124 453295 056161 056953 056952 05
FREQUENCY TABLE (MHz) Channel Number BG CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH 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 48.25 55.25 62.25 175.25 182.25 189.25 196.25 203.25 210.25 217.25 224.25 53.75 62.25 82.25 175.25 183.25 192.25 201.25 210.25 471.25 479.25 487.25 495.25 503.25 511.25 519.25 527.25 535.25 543.25 551.25 559.
Channel Number BG I DK L/L' CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH S S S S S S S S S S S S S S 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 1 2 3 4 5 6 7 8 9 10 11 12 13 14 663.25 671.25 679.25 687.25 695.25 703.25 711.25 719.25 727.25 735.25 743.25 751.25 759.25 767.25 775.25 783.25 791.25 799.25 807.25 815.25 823.25 831.25 839.25 847.25 855.25 663.25 671.25 679.
Channel Number BG I DK L/L' S S S S S S S S S S S S S S S S S S S S S S S S S S S 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 41 259.25 266.25 273.25 280.25 287.25 294.25 303.25 311.25 319.25 327.25 335.25 343.25 351.25 359.25 367.25 375.25 383.25 391.25 399.25 407.25 415.25 423.25 431.25 439.25 447.25 455.25 463.25 271.25 279.25 287.25 295.25 303.25 271.25 279.25 287.25 295.25 303.25 284.75 296.75 55.75 60.50 63.75 311.25 319.25 327.25 335.25 343.25 351.25 359.
