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Belson BSV-2751, Руководство по обслуживанию

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19

 

TROUBLESHOOTING GUIDE 

1. Process of diagnosing happening troubles     

     

                                                   

 

                                                                                    no 

 

                                                   

                    Yes, switch it on 

                                                                                            no 

 

                                   

                                                      yes 

no 

 

                                                             

yes 

                                                                                        no 
 

 

 

 

 

no                                                                   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main power switched on

Check if power supply, infrared board, CPU 

and peripherals (flash) and power line are in 

trouble 

Check if the 88

th

 pin of CPU is square wave. 

Check CPU peripherals, FLASH/SRAM 

peripherals 

Check if back light plate, 32th pin of CPU,

back light control has any problem 

Video signals of various 

channels are normal 

Check if the input signal of this channel to 

IC pin is normal. Or consider if IC and its 

peripherals and LVDS output are normal 

Audio signals of various 

channels are normal. 

Check if the channel input signal to IC pin is 

normal. Or consider if 

IC(MPS7720/MSP3410) and its peripherals 

are normal 

Is back lamp lit? 

Indication lamp Yellow?

Indication lamp red? 

Содержание BSV-2751

Страница 1: ...COLOR TELEVISION LC27M6S BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 2: ...CTIONS 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 ...

Страница 3: ...tchen or nearby fire source heating equipment and devices or exposure to sunlight etc Otherwise bad effect will result 2 5 If any foreign substance such as water liquid metal slices or other matters happens to fall into the module be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short...

Страница 4: ...or storage 10 90 2 13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen as commmonly called ghost shadow The extent of the residual picture varies with the maker of LCD screen This phenonmenon doesn t represent failure This ghost shadow may remain in the picture for a period of time several minutes But when operating it please avoid displaying sti...

Страница 5: ...sor is moved to a certain adjustment item press VOL and VOL keys and then it is possible to carry out the adjustment for the item Press MENU and exit from the factory menu Before switching off the TV set press S M and it is possible to reenter the factory menu This state is called factory state Check HDCPEEPROM DDC FLASH PAL to see if they are flash written In production data processing board and ...

Страница 6: ...eaker is normal and if the image is normal Switch on PIP and POP multi pictures connect earphone wire and check if the display and sound are normal 4 2 AV S Video port Separately input the signals from the terminals of AV S and check if the display and sound are normal Switch on PIP and POP multi pictures connect earphone wire and check if the display and sound are normal 4 3 SCART port Note When ...

Страница 7: ...ious formats of YUV signals as in Table 1 Check if the display and sound are normal If there are deviations for the line and field values on the picture press Auto Sync on the Screen menu and make calibration If the picture shows slight interference adjust the Fine Tune of the Screen menu for calibration Switch PIP on connect the earphone and check if the display and sound are normal Table 1 Signa...

Страница 8: ...the Screen menu and make calibration Switch PIP on connect the earphone and check if the display and sound are normal 4 7 For the ex works settings please see Tables 3 8 Ex works setting values have been normally initialized by the software The only thing for the factory to do is to proof read the values Table 3 Setting of Factory Option Menu Page Table 4 Setting of Video Min Max Page item ex work...

Страница 9: ... Scart2 Volume 20H D K select HDEV3 Off Equalizer Bands Max 60H Spatial Mode Off AVC Off Table 6 White Balance Adjust Setting Page item ex works settings R Offset 1CH G Offset 00H B Offset 25H R Gain F0H G Gain F0H B Gain F0H Brightness 50 Contrast 50 Note 9883 Adjust is only for adjustment of YPBPR white balance so different models and units may have different values Set 9883 Registers are used f...

Страница 10: ...o Child Lock Off Menu Language English Country UK WSS OFF Blue Screen On Note The forth item and the fifth item should be designed according to the customer s request Trouble shooting Before servicing please check to find the possible causes of the troubles according to the table below 1 Antenna Picture is out of focus or jumping Bad status in signal receiving Maybe broadcast signal itself is not ...

Страница 11: ...he liquid crystal TV set and make proper adjustment according to the signal types Picture too bright and there is distortion in the brightest area Check if the contrast setting is too high Possibly the output quality of DVD broadcaster is set too high It maybe also due to improper terminal connection of the video frequency signal in a certain position of the system Picture is whitish or too bright...

Страница 12: ...g the software which requires upgraded selecting the Device menu write device until the indication of success appears at the down left corner turn off the power unplug the tool and turn on the TV again Note the upgrading process maybe appears unstable because of the upgrading software but the software can download and write again automatic if download and write repeated many times please turn off ...

Страница 13: ...esister fed into N703 video switch SN74CBT3257CDR After switching over the selected signal is fed into ADC N201 MST9883 for A D conversion Then it is output in digital format of 24 digits RGB signal to PanelTv Svp PIP channel Through image zooming and OSD superimposition it is then output in electric level TTL for driving LVDS liquid crystal display screen DVI signal is received through DVI receiv...

Страница 14: ...GA320 2X4MX32 SDRAM SDA5550M TMDS TFP501 AT24C08 FLASH HS VS CLK AT24LC32 MSP34X0 AV1 YC AUDIO SCART1 AUDIO SCART2 AUDIO AUDIO MP AUDIO PIP AUDIO M62494 SRS STEREO MONO AUDIO OUT FB YPBPR TC4052 RGB AUDIO YPBPR AUDIO TLE2142 EARPHONE 24Bit DIGITAL OUT DS90C383 DVI AUDIO Teletext RGB FB Panel MP7720 SPEAK SCART2 Y VIN1 C AV OUT TV OUT DVI 4 BLOCK DIAGRAM 12 ...

Страница 15: ...al sound power amplifier N213 N214 MPS7720 for amplification and then further fed into the loudspeaker In the future it may be changed into sound box for improved sound quality for the reproduction of sound Another portion is fed separately through left and right sound channels into the earphone power amplifier N212 TLE2142 After amplification there it is output to earphone jack for listening to T...

Страница 16: ...ital format IUT656 into main processor IC N101 PanelTv Svp At the same time the VPC3230 VOUT signal after isolation is divided into two portions One portion is fed into video board as AV OUT for output the other portion is fed to N501 SDA5550 as the decoding signal for teletext Therefore this TV model is ready to support teletext function under TV AV SCART1 and SCART2 The main pins of VPC3230 in t...

Страница 17: ... diagram of MST9883 is shown below d IC TFP501 that receives DVI signal The differential signal of DVI is fed into N761 TFP501 Then it is converted into 24bit digital signal which is in turn fed to the main processor IC N101 PanelTv Svp Furthermore when TFP501 is matched with N760 M24C08 it is possible to realize the display of image signals with HDCP information The block diagram of TFP501 is sho...

Страница 18: ...y screen Besides the digital signal fed from VPC3230 MST9883 and TFP501 are subject to image zooming and OSD superimposition in N101 Then they are output in electric level TTL to N601 DS90C383 LVDS transmitting IC for driving the liquid crystal display screen Furthermore it is also possible to realize multi display functions in N101 such as PIP POP double pictures and 9 pictures The main pins of P...

Страница 19: ...201 X 212 X213 X216 X 204 X 217 T O I N V E R T E R C N 2 T O PA N E L X 211 2 2 4 6 10 8 4 4 4 3 10 12 30 8 4 D i g i t p ro ce ss b o a rd K ey board V i d e o p ro ce ss b o a rd A u d i o tra n si ti o n b o a rd P o w e r b o a rd rem ote control recei ve U pgrade i nterface board S p e a ke r S p e a ke r Note The coded number of the printed circuit boards above and parts may be changed alon...

Страница 20: ...383 353 03830 70 N761 TFP501 353 05010 00 Sound processing board 667 L27M7S 15 667 L27M6S 15 N201 MSP3410G 353 34100 80 N203 M62494FP 353 62494 20 N213 N214 MP7720 353 77200 10 Video processing board 667 L27M7S 40 667 L27M6S 40 TUNER201 JS 6B2 122A2 A2 590 40512 00 TUNER202 JS 6B2 121A2 590 40511 00 N212 TLE2142CP 352 21420 00 IR receiver board 667 L27M6S 09 Button board 667 L27M6S 05 Updata inter...

Страница 21: ...ASH SRAM peripherals Check if back light plate 32th pin of CPU back light control has any problem Video signals of various channels are normal Check if the input signal of this channel to IC pin is normal Or consider if IC and its peripherals and LVDS output are normal Audio signals of various channels are normal Check if the channel input signal to IC pin is normal Or consider if IC MPS7720 MSP34...

Страница 22: ... Is indicator yellow Disconnect power supply board with data processor and measure Standby5V Disconnect data processing board with infrared board X793 and then see which board is out of order Powers supply board in trouble heck if I2C bus line of the system is short circuited Check CPU N501 FLASH N502 GAL N553 re set the power supply of IC N552 Check the pin voltage of N902 D903 Check if the 50th ...

Страница 23: ... are detected to be with sound but without picture As to inspection details of other channels please refer to inspection program 4 4 With picture but without sound no yes yes no Sound yes but picture no Is back lamp lit Try other channels see if all without pictures N101 and peripheral Transferred to 4 inspection Check back lamp board if back light control by 32nd pin of CPU is in trouble Picture ...

Страница 24: ...d 2nd pin of N203 has signal input Check on peripheral circuit of power amplifier and power supply Check N203 peripheral circuit of power amplifier and power supply Check if relevant channel of N201 has signals input Check peripheral circuit of N201 crystal oscillation and power supply Check all levels of circuit following the channel of audio signal input Check if C193 has signal input There is t...

Страница 25: ... are normal Check peripheral circuit of N601 and power supply Check peripheral circuit of N101 crystal oscillation power supply Check if C140 and C144 have signal input Check if 12th pin of TUNER201 on TV has signal output Check if line field syn signal and clock signal output from N101 are normal Check peripheral circuit of N601 and power supply Check peripheral circuit of N101 crystal oscillatio...

Страница 26: ...it of N401 crystal oscillation power supply Check if 73rd pin of N401 has signal input Check the circuit from TUNER202 N401 Check peripheral circuit of N601 power supply N601 Check peripheral circuit of N101 crystal oscillation Check peripheral circuit of TUNER20 power supply and bus line Check if 4th 5th 6th and 74th of N401has signal input Trouble in channel from SCART1 socket to N401 Check if t...

Страница 27: ...f N401 crystal oscillation and power supply Check periph eral circuit of N601 and power supply supply Check peripheral circuit of N101 crystaloscillationand power supply Check if 71th and 72th pins of N401 have signal input There is problem with the channel from SCART2 socket to N401 Check if line field syn signal and clock signal output from N101 are normal Check peripheral circuit of N401 crysta...

Страница 28: ...ormal Check if line field sync signal and clock signal output from N101 are normal Check peripheral circuit of N201 power supply and bus line Check peripheral circuit of N601 and power supply Check peripheral circuit of N101 crystal oscillation and power supply Check if 4th 7th 9th pins of N703 have signal input Check if 3rd 6th 10th pins of N703 have signal input Check the channel from N703 outpu...

Страница 29: ... output from N101 are normal Check peripheral circuit power supply of N601 Check peripheral circuit of N101 crystal oscillation and power supply Check peripheral circuit power supply of N761and if the connection with DVI socket is good Check if 30th and 31st pins of N201have syn signal input There is problem with the channel from VGA socket to N703 Check if 1st and 5th pins of N701 have synchr Sig...

Страница 30: ...X3 which may result in under coloring or color speckle 2 R602 R607 resistor array in trouble which may result in the loss of corresponding color in corresponding gray degree for the picture of all channels 3 R205 R210 resistor array in trouble which may result in the loss of corresponding color in corresponding gray degree for the picture of YPbPr VGA channel 4 R777 R782 resistor array in trouble ...

Страница 31: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 32: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 33: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 34: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 35: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 36: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 37: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 38: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 39: ...BBELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01to pto ...

Страница 40: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 41: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 42: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 43: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 44: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

Страница 45: ...BELSON Dpto Tecn April 26 2005 Modelo BSV 2751 ed01 ...

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