Prima LC-15S3 Service Manual Download | Manualshive

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LCD

TELEVISION

LCD-S#

series

Europe

LC-15S3
LC-20S3
LC-20S18
LC-20S15
LC-20S15

LC-23S18

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2
3
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Summary of Contents for LC-15S3

Page 1: ...LCD TELEVISION LCD S series Europe LC 15S3 LC 20S3 LC 20S18 LC 20S15 LC 20S15 LC 23S18 ...

Page 2: ... of software upgrading Working principle analysis of the unit Block diagram IC block diagram Wiring diagram Assembly list Identification criteria for the bright spot and dark spot of the LCD screen Troubleshooting Schematic diagram 1 3 6 8 9 10 13 14 15 16 21 ...

Page 3: ... 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 circuit 2 6 Should there be smoke abnormal smell or sound from the module please shut the power off at on...

Page 4: ... of picture residue on the screen as commonly called ghost shadow The extent of the residual picture varies with the maker of LCD screen This phenomenon 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 still picture in high brightness for a long time 3 Points for attention during installation 3 ...

Page 5: ...rphone and speaker are normal ADC correction and white balance adjustment Input AV S signal and HDTV signal check various functions under AV S terminal Check the main board and supply power board Input YPbPr YCbCr signal check the screen display is normal in the various channel and various functions analog quantity control line field center etc Input VGA signal and check if display is normal in th...

Page 6: ...evel adjust brightness and contrast let brightness to 180nit enter factory menu still the green color temperature value adjust blue color temperature and red color temperature let to x 0 284 0 02 y 0 299 0 02 6 Performance Inspections 6 1 TV function Enter the search menu auto search connect RF TV terminal to the central signal source check if there is station skipping 6 2 AV S input terminal Inpu...

Page 7: ...250 45 000 60 6 1920x1080 50i 74 250 28 125 50 7 1920x1080 60i 74 250 33 750 60 6 5 For factory preset see table 3 Table 3 Factory Preset Item Factory Preset Item Factory Preset Picture mode NATURE OSD language English Sound mode User Color temperature Standard Volume 30 Backlight 50 ...

Page 8: ...o VGA connection wire and then connect them by a upgrade board 2 Enter the factory menu select upgrading item 3 Connect main board to PC 4 Operation the vct49xyi_start exe display the software interface follow as 5 Click the TVT item 6 Click the BOOTLOADER button display the DOS interface after the interface disappear click ...

Page 9: ...sure the program click the black bar then display the interface select the upgrading program After select the program press the OK button return the menu click LOAD BIN FLASH after the written the program is finish the BAR disappear 9 Turn off the power supply return the set is over NOTE Do not shut the power off or turn the TV set on during the FLASH write Otherwise it may lead to no way for flas...

Page 10: ...deo sound signal of N102 VCT4993 via Z103 of SAWF Surface Acoustic Wave Filter IF signal is demodulated for image and sound output a composite video signal then select switch signal source for video and s video of AV board and RGB signal of SCART of the main board it send to digital image processing chip MST519VA via image processing ITU656 of digital signal After sound of DVI and YPBPR via switch...

Page 11: ...9 Block diagram ...

Page 12: ... It has 10 VIDEO input 3 VIDEO output 3 SOUND input and output analog RGB output ITU656 of digital signal output Figure 1 1 VCT4993R internal block diagram VCT4993R PIN instructions PIN function PIN function 41 SDA_M 78 656I02 42 SCL_M 78 656I01 44 CSZ 79 656I00 45 SCART_SWITCH 80 AUDIO_SEL_1 47 IR 81 AUDIO_SEL_0 48 MUTE 82 656CLK 50 INT 97 BKLON 58 VOUT2 98 STANDBY 60 VIN1 109 IF IN 62 Y_IN 110 I...

Page 13: ...eproduction of image MST518 PIN instructions Pin Function Pin Function Pin Function 43 DVI_IN R 65 VGA RIN 83 SDA_M 44 DVI_IN R 63 VGA GIN 33 RESET 46 DVI_IN G 60 VGA BIN 85 INT 47 DVI_IN G 40 HSYNC 86 PWM 49 DVI_IN B 41 VSYNC 87 LCDON 50 DVI_IN B 75 CRIN 90 656 CLK 52 DVI_IN CLK 72 YIN 91 98 656I00 656I07 53 DVI_IN CLK 70 CBIN 103 110 BA 0 BA 7 30 DVI_IN DDC_SCL 82 SCZ 131 138 RA 0 RA 7 29 DVI_IN...

Page 14: ...ternal block diagram 4 AN7522 dual channel single end push and pull audio power amplifier 10Wtyp Figure 1 4 AN7522 internal block diagram AN7522 PINS instruction Pin Function Pin Function Pin Function 2 5 Input 8 MUTE 9 GND output 7 12 Output 4 GND input 10 VCC ...

Page 15: ...13 Wiring diagram ...

Page 16: ...10354 00 NAME LC 20S15 LC 20S25 LC 23S18 LC 20S18 Main board 667 LPS15 01 667 LPS15 01 667 LUS25 01 667 LPS15 01 IR receiving board 667 L20S15 09 667 L23S18 09 Keys board 667 L20S15 05 667 L23S18 05 Backlight assy 667 L20H3014A 667 L20H3 14A 667 L20H3 14A Power supply board 667 L20Y15 20 667 L20Y15 20 667 L23Y25 20W Remote controller 301 U20S15 42R 301 U20S15 42R 301 U20S15 42R 301 U20S15 42R Spea...

Page 17: ...m 10mm 5mm Total defected point 8 7 5 4 Notes 1 Definition of defected point bright spot dark spot It is identified as a defected point if its area exceeds 1 2 of a single picture element R G B 2 Definition of bright spot It is identified as a bright spot if it is bright in the state of dark field and its bright size remains unchanged 3 Definition of dark spot It is identified as a dark spot if it...

Page 18: ...nd if interfered possibly by the equipment like transmitting antenna non professional radio station and cellular phone 1 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 As can be indicated by the red LED at the fron...

Page 19: ... batteries are installed in the reverse order Check if the battery is effective Check the distance or angle from the monitor Check if there is any obstruct between the remote control and the TV set Check if the remote control signal receiving window is exposed to strong fluorescence No picture and sound but only hash Check if the antenna cable is correctly connected or if it has received the video...

Page 20: ...12V 3 4 GND 5 6 18V 7 8 GND 9 PBIAS 10 PWM 2 1 No raster no picture and no sound When the main power is turned on the unit s indicator lights up in red red indicator is controlled by 3 3VSTANDBY use the remote control or the unit s STANDBY to lights up the blue indicator Whether the IR board s red indicator lights up Power board s 3 3V is abnormal Whether the blue indicator lights up when press th...

Page 21: ... board of 15 Increase the volume check whether every channel has no sound Check sound channel of VGA and YPBPR is normal Check whether the signal output by VCT4993 IC is normal VCT4993 IC or peripheral circuit does not work normally Sound amplifier or peripheral circuit does not work normally N Y Y N Power board damages or fuse blows Replace the fuse and check whether N901 D501 breakdown Replace N...

Page 22: ...Check whether pin1 of N501 has wave Replace N502 Check whether N502 is damaged Replace N505 Check whether N505 is damaged Check whether N505 D507 is damaged Replace the damaged parts Y Y Y N Y N Y N Y N N Y No power Check C505 Check DC voltage 150 370V of C528 Check DC voltage 15V of N501 Check periphery circuit Check X501 is normal Check D502 R531 and D508 N501 is damage or periphery circuit N Y ...

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Page 27: ...The POWER Schematic diagram of 23 ...

Page 28: ...The POWER Schematic diagram of 20 ...

Page 29: ...The POWER Schematic diagram of 15 ...

Page 30: ...LCD S M LC S Europe Ver 1 0 ...

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