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BBK LT1902S Service Manual
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BBK LT1902S Service Manual

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Service Manual
(1906 2206)
HDMI
MST719
2009/10/13
- 1 -

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Summary of Contents for BBK LT1902S

  • Page 1 Service Manual (1906 2206) HDMI MST719 2009/10/13 - 1 -...

  • Page 2: Table Of Contents

    Contents 1. Precautions and Safety Notices…………………………………………………………3 2. Specification…………………………………………………………………………………5 3. Function Control Description…………………………………………………………….10 4. Circuit Description…………………………………………………………………………11 5. Adjusting Procedure………………………………………………………………………17 6. Trouble Shooting Flow Chart……………………………..........23 7. Block Diagrams…………………………………………………………………………….26 2009/10/13 - 2 -...

  • Page 3: Precautions And Safety Notices

    1. Precautions and Safety Notices Prior to using this service manual, please ensure that you have carefully followed all the procedures outlined in the user’s manual for this product. (1) Read all of these instructions. (2) Save these instructions. (3) Follow all warnings and instructions a marked on the product. (4) Unplug this product from the wall outlet before cleaning.
  • Page 4 c. If the product has been exposed to rain or water. d. If the product does not operate normally, when the operating instructions are followed. Adjust only those controls that are covered by the operating instructions since improper adjustment of other controls may result in damage and will often require extension work by a qualified technician to restore the product to normal operation.

  • Page 5: Specification

    2.Specification Model No. 22” 19” 1440 (H) x 900(V) 1680 (H) x 1050(V) Display Pixel Pixel Pitch 0.285mm (H) x0.285mm (V) 0.282mm (H) x0.282mm (V) Active Display Area 410.4 (H) x 256.5 (V) 473.76 (H) x 296.1(V) Pixel Type R+G+B vertical stripe R+G+B vertical stripe Number of Colors 16.2M...
  • Page 6 Graphic and Video signal Output Source The Speaker Out Output Jack Shall Consist of Speaker Out 1. 3.5mm Mini-stereo ×1 Analog HD15 PC Signal (RGB) Format R, G, B Analog Level/Impedance 0.7Vp-p / 75 DDC 1/2B Compliant with Revision 1.3 Sync H/V separate 3V TTL level / 1k...
  • Page 7 SDTV 576p SDTV 576p SDTV 576p SDTV 576p SDTV 576p SDTV 480i SDTV 480i SDTV 480i SDTV 480i SDTV 480i SDTV 480p SDTV 480p SDTV 480p SDTV 480p SDTV 480p HDTV 720p HDTV 720p HDTV 720p HDTV 720p HDTV 720p HDTV 720p HDTV 720p HDTV 720p...
  • Page 8 Signal Connector Pin Assignment HMDI connector is a type A receptacle for video/audio mode. 1.TMDS Data 2+ 9.TMDS Data 0- 17.CEC/GND 2.TMDS Data 2 shield 10.Clock + 18.+5V Power 3.TMDS Data 2- 11.Clock shield 19.Hot Plug Detect 4.TMDS Data 1+ 12.Clock - 5.TMDS Data 1 shield 13.CEC...
  • Page 9 SCART connector Pin No. Signal Inter Connection Pin No. 1 Audio right channel output (0.5 Vrms, < 1K ohms) 2 2 Audio right channel input (0.5 Vrms, > 10K ohms) 1 3 Audio left channel output (0.5 Vrms, < 1K ohms) 6 4 Audio ground 4 5 Blue signal ground 5 6 Audio left channel input (0.5 Vrms, >...

  • Page 10: Function Control Description

    3. Function Control Description Operation, Adjust and Programming 1.POWER Button Push this button to turn the unit on, and press it one more time to turn it off. 2.MENU Button Press this key to pop up the OSD menu under the current selected input mode. 3.TV/AV Button Press this key to select input sources.

  • Page 11: Circuit Description

    4. Circuit Description (1) SMPS and Voltage Regulator circuit The LCD TV power board should be designed so that AC power supply AC 100V to 240V and the input frequency within 50/60Hz can be applied. (2) Video Circuit HDMI SCART LVDS MST719 TO PANEL...
  • Page 12 (3) Audio Circuit Multiplexer 4052 DESCRIPTION The UTC 4052 analog multiplexers is digitally controlled analog switch. The device feature low ON impedance and very low OFF leakage current. Control of analog signals up to the complete supply voltage range can be achieved. FEATURES *Triple Diode Protection on Control Inputs *Switch Function is Break Before Make...
  • Page 13 2-channel multiplexer PI5V330 DESCRIPTION Pericom Semiconductor's PI5V330 is a true bidirectional Quad 2-channel multiplexer/ demultiplexer recommended for both RGB and composite video switching applications. The switch can bi driven from a current output RAMDAC or voltage output composite video source. FEATURES *High-performance solution to switch between video sources *Wide bandwidth:200MHz...
  • Page 14 Stereo D/A Converter CS4334 DESCRIPTION The CS4334 family members are complete, stereo digital to analog out put systems including interpolation, 1-bit D/A conversion and out put analog filtering in an 8-pin package. The CS4334 support all major audio data interface formats, and the individual devices differ only in the supported interface format.
  • Page 15 Audio Processor MSP3415G DESCRIPTION The MSP 34×5G 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 processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed in a single chip.
  • Page 16 Audio Amp. TDA1517 Description The TDA1517P is an integrated class-B dual output amplifier in a 18-lead dual in-line (DIP18) plastic medium power package. The device is primarily developed for multi-media applications. FEATURES *Requires very few external components *High output power *Fixed gain *Good ripple rejection *Mute/stand-by switch...

  • Page 17: Adjusting Procedure

    5. Adjusting Procedure ITEM Program Equipments Requirement Procedure & SPEC Menu 1. M/B Voltage Digital Connect with ‧ Connect Power to check if Power LED displays the confirmation Multimeter AC Adapter RED light ‧ Use voltmeter to measure output position, and check voltage CON1/Pin1-2(12V);...
  • Page 18 Cable interlaced output 6. TV FLUKE ‧ To send out the TV signal by 54200 de-interlacing 54200 ‧ To set up the Reduce of OSD to be Strong, and to other reduce snowflakes. seem rate of ‧ To set up the Reduce of OSD to be OFF, and the equipment image will display serious snowflakes.
  • Page 19 the panel degrees) 4. Ambient temperatu re: 25±5 C 5. Ambient humidity: 65±20% 10. Display Mode HDTV ‧ Select source Test TV,SCART,Video,S-Video,VGA,HDMI. S-Video HDMI ‧ Press MENU to select the Screen and Select the Cable Display Mode to be 16:9, 4:3, Zoom or Video Cable Anamorphic.
  • Page 20 output(NTSC Mode) ‧ ‧ Under S-VIDEO MODE, watch the movable circle pattern is normal without tint. The pattern is normal under 300 and 400. ‧ Under VIDEO MODE, watch the movable circle patter, static state is normal without the tint, and movement contains tint...
  • Page 21 15. NTSC/PAL Play DVD test ‧ Select source then choose VIDEO or S-VIDEO. switch S-Video disc VIDEO ‧ Sending the signal from DVD test disc (sixth Cable ESSENTIALS paragraph) Video Cable (A-1) Set DVD to interlaced output ‧ ‧ Switch DVD to output mode NTSC/PAL if there is the action of switch.
  • Page 22 ‧ Check if the action is normal. 18. Setting DPMS Power Signal wire ‧ Check OSD if the screen displays count down regulator connect picture. Chroma/6530 with ‧ Check if it turns off when the time ends off. signal. ‧ Check if LED show red color. VG828 ‧...

  • Page 23: Trouble Shooting Flow Chart

    6. Trouble Shooting Flow Chart 2009/10/13 - 23 -...
  • Page 24 2009/10/13 - 24 -...
  • Page 25 2009/10/13 - 25 -...

  • Page 26: Block Diagrams

    7. Block Diagram 2009/10/13 - 26 -...
  • Page 27 MST719 INPUT AV_MODE AV_MODE AV_MODE SCART_VOUT AMPLIFIER AUDIO SCART_VOUT SCART_RIN S/D _Y SCART_RIN SCART_RIN S/D_Y S/D_Y DACM_R SCART_LIN S/D_C DACM_R DACM_R SCART_LIN SCART_LIN S/D_C S/D_C DACM_L DACM_L DACM_L PWD_MT I NNER_RIN SCART_CVBS PWD_MT PWD_MT INNER_RIN INNER_RIN SCART_CVBS SCART_CVBS AUDIO_MUTE INNER_LIN AV_CVBS AUDIO_MUTE INNER_LIN...
  • Page 28 SCART CVBS/C SCART_CVBS SCART_VOUT SCART_CVBS C166 C165 SHIELD 220p/nc 220p/nc V_IN SCART_LOUT SCART_VOUT V_OUT SCART_VOUT R182 BLANKGND SCART_ROUT VGND BLANK PH-6A SCART_R DATAGND RGND DATA +5Vsb_IN SCART_G FERRITEBEAD0603 AV3-8R4-5 PH-2A RCA-1 CLKOUT C167 470n R167 0/nc R186 GGND SCART_R SC_R AUDIO/RGB/16:9 SWTCH SCART_B...
  • Page 29 ESD/NC HDMI_5V TMDS_RX2+ R144 10 HDMI_RX2+ RX2P TMDS DATA2+ TMDS_RX2- R143 10 HDMI_RX2- RX2N TMDS DATA2- DATA2 SHIELD TMDS_RX1+ R142 10 HDMI_RX1+ RX1P TMDS DATA1+ TMDS_RX1- R141 10 HDMI_RX1- +5Vsb_IN+3.3V_stb RX1N TMDS DATA1- DATA1 SHIELD TMDS_RX0+ R140 10 HDMI_RX0+ TMDS DATA0+ RX0P TMDS_RX0- R139 10...
  • Page 30 CRYSTAL R198 VGA_R+ VGA_R C143 47n VDDC R195 AVDD_LPLL VGA_SOG VDDP R199 C142 1n VGA_G+ R100 +3.3V_stb VGA_G C131 47n C104 VBL_CTL VBL_CTL R200 P_KEY XTAL_IN VGA_B+ R101 PANEL_EN VGA_B PANEL_EN C129 47n DVD_AUTO DVD_AUTO DVD_ON/OFF DVD_ON/OFF C171 C172 C173 VDDP AVDD_LDVI 100p...
  • Page 31 +5Vsb_IN +12V +5Vsb_IN R113 4.7k PH-9A R126 PANEL_POWER J6 FH12_50S BLK_ON MMBT3904 4.7k INV_ON INV_ADJ +5Vsb_IN R114 4.7k R127 4.7k R134 PCLK BLK_ADJ C128 100n MMBT3904 BA[7:0] RXE0+ RXE0- RXE1+ RXE1- RXE2+ RXE2- RXEC+ RXEC- RXE3+ RXE3- RXO0+ RXO0- RXO1+ RXO1- RXO2+ RXO2-...
  • Page 32 +5VD_34XX +5VA_34XX MSP34x5G_PMQFP44 +8V_LDO +8V_LDO DVSUP AVSUP AHVSUP C99 1u/10v C97 1u/10v 100n C100 1u/10v ANA_IN1+ C98 1u/10v DACML DACM_L DACM_L C54 1u/10v DACMR DACM_R ANA_IN- DACM_R C56 1u/10v 100p C55 1u/10v C53 1u/10v 330n C117 1.5n MONO_IN 330n C118 1.5n AV_LIN SC1_IN_L 330n...
  • Page 33 +12V_SW 100k +12V_SW 4.7k R32 10k +12V_SW 1N4148 MUTE 100u/16v 100n C156 C149 R23 10k 100u/16V MMBT3906 R129 R128 33K R159 OP_VCC PWD_MT MMBT3904 C135 C114 AUDIO_MUTE U15A 100n 4.7k 220u/16V BAV70L R118 C124 1u/10V R130 R191 DACM_L C158 10u/16V/nc PHONE_LIN PWD_MT PWD_MT...
  • Page 34 FQ1216ME TV_CVBS CVBS AF_AUDIO +5V_TUNER_RF +5V_TUNER_RF TV_CVBS +5V_TUNER_RF IF_AUDIO P5VRF P5VIF FB0805 C136 +12V_SW 220u/16v C151 C153 100n 10n/NC 100n 10n/NC 220u/16v PH-14A/NC 100u/16v 100u/16v_nc +5V_TUNER_RF R103 470k C101 TV_CVBS TV_CVBS+ 0/nc +5V_TUNER_RF TV_CVBS+ R108 CVBS_OUT 220n R109 1N4148 220p/nc TV_CVBS- MMBT3906 TV_CVBS-...
  • Page 35 +12V_IN +5Vsb_IN +5Vsb_IN C58 100n C84 10n 47uH/3A +5V_DVD AO3401 SYNC +12V +12V_IN J21 DC3AIN COMP TEST POINT SK34B 31K 1% 470p/nc FS1 20N-060H/L 100n 100k MP1423 R102 R86 10k 1% 10/nc 100n 470u/16v 120p 10u/25v 470u/16v 0/NC +5Vsb_IN 2.2k +12V_IN +5V_DVD +5V_DVD +12V_IN...