Belson BSV-2751 Service Manual
  1. Manuals
  2. Brands
  3. Belson Manuals
  4. TV
  5. BSV-2751
  6. Service manual
Belson BSV-2751 Service Manual

Belson BSV-2751 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01
COLOR TELEVISION
LC27M6S

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the BSV-2751 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Summary of Contents for Belson BSV-2751

  • Page 1 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01 COLOR TELEVISION LC27M6S...

  • Page 2: Table Of Contents

    CONTENTS SAFETY INSTRUCTIONS………………………………………………………………………1 INSTRUCTIONS ON ADJUSTING AND TESTING…………………………………………….3 TROUBLE SHOOTING……………………………………………………………………………8 METHOD OF SOFTWARE UPGRADING……………………………………………………10 BASIC WORKING PRINCIPLE…………………………………………………………………10 BLOCK DIAGRAM…………………………………………………………………………...12 MAIN IC BLOCK DIAGRAM…………………………………………………………………..13 WIRING DIAGRAM………………………………………………………………………….17 SERIAL NO. OF PARTS…………………………………………………………………………18 TROUBLESHOOTING GUIDE………………………………………………………………….19 SCHEMATIC DIAGRAM………………………………………………………………….29...

  • Page 3: Safety Instructions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety instructions 1 Instructions 1.1 Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire 1.2 Anti static measures to be taken (throughout the entire production process!): 1.2.1 Do not touch here and there by hand at will;...
  • Page 4 2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it.

  • Page 5: Instructions On Adjusting And Testing

    Instructions on adjusting and testing 1. Debugging equipment PM5515(Video signal generator), PM54200(SCART signal generator), VG-848(signal generator of YUV,VGA,DVI), and CA210(White balancer) 2. Process of debugging See Fig.1. Check HDCPEEPROM, DDC, FLASH, PAL to see if they are flash written. In-production data processing board and analog board Check the data processing board and analog board Combined adjustment for the general assembly Connect to central signal source, check various TV functions (station skipping, analog control...
  • Page 6 When the machine is switched off it is possible to exit from the factory state. 3.1. EEPROM Initialization Enter the first page of the factory menu, select EEPROM Erase and then press”ENTER” key. Switch the TV set off and restart the set. Then it’s ready for initialization. Note: For the restart it takes relatively longer time to show blue screen! 3.2.
  • Page 7 should be Scart2 AV and SCART signal is changed into that of Y/C. Switch the channel over to SCART 2 Y/C and observe if the picture and sound are normal. Change the display format (16:9 and 4:3) of the image output from the signal source. Check if the TV set can automatically identify it. Switch PIP on,connect the earphone and check if the display and sound are normal.
  • Page 8 800x600 37.879 60.317 VESA 800x600 48.077 72.188 VESA 800x600 46.875 75.0 49.5 VESA 800x600 53.674 85.061 56.25 VESA 1024x768 48.363 60.004 VESA 1024x768 56.476 70.069 VESA 1024x768 60.023 75.029 78.75 VESA 4.6. DVI Port In addition to the signal formats as listed in Table 2, DVI can receive the following three high definition signal formats -- 576P, 720P/60 Hz and 1080I/60 Hz.
  • Page 9 Color Min Color Middle Color Max Hue Min Hue Middle Hue Max Table 5 Setting of Factory Audio Setting Page item ex-works settings Volume Min Volume 30 Volume 50 Volume Max Prescale Scart Prescale FM/AM Prescale Nicam Scart1 Volume Scart2 Volume D/K select HDEV3 Equalizer Bands Max Spatial Mode...

  • Page 10: Trouble Shooting

    In the state of factory,it is possible to change setting values for picture and sound in various factory modes. Otherwise any equilibrium values of picture and sound different in the other states are considered the setting of Custom. Table 7 Setting of Picture Analog Value Vivid Standard...
  • Page 11 2.TV set: Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly into the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been switched on.

  • Page 12: Method Of Software Upgrading

    Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal. No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose.
  • Page 13 sound reproduction. M62494 is a virtual surrounding sound processing IC, which is subject to the control of I/O port (77/78Pin) of N201 MPS3410. The video signal output from the tuner, AV signal and Svideo signal, after matching with resistor, directly enter, respectively from its own channel, into the main decoder IC N101(PanelTv-Svp), where they are subject to video switch-over, A/D conversion, digital decoding, image zooming and OSD superposition.

  • Page 14: Block Diagram

    4.BLOCK DIAGRAM 2X4MX32 SDRAM YPBPR RGB/YUV MST9883 PI5V330 Y/VIN1 C SCART2 AV OUT SCART RGB 8-bit Data Panel-SVP 24Bit DIGITAL OUT SCART1 TV OUT VPC3230 DS90C383 VIN3 BGA320 VIN2 HS,VS,CLK TUNER2 TC4052 TUNER1(CVBS1) Y/CVBS3 C CVBS_OUT AV1/YC AUDIO Teletext RGB FB SRS STEREO/MONO SDA5550M FLASH...

  • Page 15: Main Ic Block Diagram

    5. Introduction to main IC and principle block diagram a). Sound processing IC(MSP3410) Audio signal is fed directly into audio processor N201 MSP3410 whereas two-way tuner sends intermediate frequency signal SIF of its second sound to N201 for processing (used for decoding of stereo or automatic sound volume control.
  • Page 16 56, 57:left and right channels of AV IN sound; 67, 69:SIF input of TV for main and sub channels; 59:MONO input of TV for sub channel Sound power amplifier MPS7720 is a highly efficient Type D power amplifier of mono channel input and output.
  • Page 17 The main pins of MST9883 in this TV model are described as follows: 56,57:SCL,SDA, for the control of IC operations; 43, 48, 54:RGB/YUV signal input; 30, 31:Line and field synchronous RGB signal input RGB; The block diagram of MST9883 is shown below: d).
  • Page 18 e). Main picture decoding and processing IC(PanelTv-Svp) The block diagram of PanelTv-Svp is shown below: The video signal output from main tuner(TUNER201),AV and Svideo signal, after matching with resistor, fed directly through its respective channel into main decoder IC N101(PanelTv-Svp), where they are subject to the changeover of video, A/D conversion, digital decoding, image zooming and OSD superimposition.

  • Page 19: Wiring Diagram

    WIRING DIAGRAM X 801 U pg rad e i nte rfa ce b oa rd 782-L 27M 6-2900 X 01 X 02 X 794 X 601 pow er LV D S X 102 X 791 X 796 X 790 X 707 X 201 X 204 X 216...

  • Page 20: Serial No. Of Parts

    Serial No. of Parts NAME main component or NO. N101 PanelTv-Svp (353-PANEL-20) N201 MST9883 (353-98830-10) data processing 667-L27M7S-69 N401 VPC3230 (353-32300-80) board (667-L27M6S-69) N501 SDA5550M (353-55500-00) N502 W29C040 (353-29040-00) N601 DS90C383 (353-03830-70) N761 TFP501 (353-05010-00) Sound 667-L27M7S-15 N201 MSP3410G (353-34100-80) processing (667-L27M6S-15) N203 M62494FP...

  • Page 21: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. Process of diagnosing happening troubles Main power switched on Check if power supply, infrared board, CPU Indication lamp red? and peripherals (flash) and power line are in trouble Yes, switch it on Check if the 88 pin of CPU is square wave. Indication lamp Yellow? Check CPU peripherals, FLASH/SRAM peripherals...
  • Page 22 2.Trouble of 3-no’s (no raster, no picture and no sound) 3-no’s If power indication lamp is lit Is indicator Check Standby5V yellow? Disconnect power supply heck if I2C bus Check line of the system board with data processor CPU(N501),FLASH( and measure Standby5V is short circuited N502),GAL(N553),re set the power supply...
  • Page 23 between N501,N502 and N503, in addition to inspect the welding condition of relevant parts and fittings. If the waveform detected is of regular square wave or no signal, it shows that N501 or N502 or N503 is abnormal so that the address link and data link between them become out of order.
  • Page 24 Check if 1 and 2 Check on peripheral circuit of power amplifier and power supply of N203 has signal input Check if Check N203 relevant channel peripheral circuit of of N201 has power amplifier and signals input power supply Check all levels of circuit following the Check peripheral circuit...
  • Page 25 b). No picture for S terminal Check if C140 and C144 have signal input Problem in the channel form S Check if line/field syn. signal and terminal socket to N101 clock signal output from N101 are normal. Check peripheral Check peripheral circuit of circuit of N601 N101, crystal...
  • Page 26 No picture in sub-screen: Check if 73 pin of N401 has signal input Check if line/field syn. signal Check if 12 pin of TUNER202 and clock signal output from on TV board has signal output N401are normal Check peripheral circuit of Check if TUNER20 , power supply Check...
  • Page 27 Check if line/field Check the channel from syn. signal and clock N501 N501 signal output from SCART1 socket N401 are normal Check if line/field Check peripheral syn. signal circuit N401, clock signal output crystal oscillation from N101 and power supply normal Check peripheral circuit of Check periph- eral...
  • Page 28 Checkperipheral Check peripheral circuit of circuit of N601 N101 crystal oscillation, power supply and power supply f).No picture in YPbPr/YcbCr channel Check if 43 and 54 pins of N201have signal input Check if line/field syn. signal Check if 4 and clock signal output from pins of N703 have N201 are normal signal input...
  • Page 29 g). No picture in D_Sub channel If the display of YpbPr input signal is normal Check as per inspection Check if 30 and 31 program (f) pins of N201have syn. signal input There is problem with Check if 1st and 5th the channel from VGA pins N701...
  • Page 30 Note: To enable DVI picture to be displayed normally, especially to be connectable with the computer display card, the top priority is to ensure that N762(DDC chip of DVI port) are well flash written. When picture signal is with HDCP,it is also necessary to ensure that the KEY in HDCP of N760 are well flash written.

  • Page 31: Schematic Diagram

    BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 32 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 33 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 34 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 35 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 36 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 37 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 38 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 39 BBELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01to. pto.
  • Page 40 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 41 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 42 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 43 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 44 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...
  • Page 45 BELSON · Dpto. Tecn/ April 26-2005 / Modelo: BSV-2751 ed01...

Table of Contents