Related Manuals for Prima LC-20S3
Summary of Contents for Prima LC-20S3
- Page 1 LCD TELEVISION LCD-S# series LC-15S3 LC-20S3 LC-20S18 LC-20S15 LC-20S15 LC-23S18 Europe...
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Page 2: Table Of Contents
CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….…………………………….… Method 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…………………………………………………………………………..……... -
Page 3: Safety Precautions
This service manual is only for service personnel to take reference with. Before Attention: servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;... - Page 4 would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.
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Page 5: Alignment Instructions
Alignment instructions 1. Test equipment PM5518 (Video signal generator) K-7253 (VGA signal generator) CA210 (White balancer) 2. The alignment flow chart (see below figure) Written N101 and N304 Production of main board and TV board on the line. Check the main board and supply power board Combined test for general assembly and aging ADC correction and white balance adjustment Connect to central signal source;... - Page 6 3. Written program Written program of IC(N101, N304) 4. Main board adjustment a. According to wiring diagram, connect main board to supply power, the indicator to red. b. Press the POWER button in the senor control, the indicator to blue c.
- Page 7 720x480@60p 27.027 31.500 720x576@50p 27.000 31.250 1280x720@60p 74.250 45.000 1920x1080@50i 74.250 28.125 1920x1080@60i 74.250 33.750 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...
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Page 8: Method Of Software Upgrading
Method of software upgrading Steps of software upgrading are as follows: 1. Using the parallel port wire and DVI transfer to VGA connection wire and then connect them by a upgrade board. 2. Enter the factory menu, select upgrading item. 3. - Page 9 the BOOTLAODER VERSION, if it value form 0 to 21, connecting is normal. 7. Click the ERASE 16 BIT FLASH, erasure the program. Click the BOOTLAODER VERSION, if it value form 21 to 1, the program is erasure. 8. After erasure the program, click the black bar, then display the interface, select the upgrading program.
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Page 10: Working Principle Analysis Of The Unit
Working principle analysis of the unit The set is multi-media LCD TV boardcast receiver, it contain PAL/SECAM B/G,I,D K L L’ of color system, and AV input, S-VHS input, PC,VGA,DVI and earphone output terminals. The power circuit is built-in, it adopt the power manage chip STR-W6856N of the SANGKEN company, output the 12v and 18v voltage, provide a 12V for the picture processing and 18V for sound amplifier. -
Page 11: Block Diagram
Block diagram... -
Page 12: Ic Block Diagram
IC block diagram 1.VCT4993R VCT4993R (N102) is a integrative chip of digital IF amplifier, video decode, sound processing, image processing and CPU, it has teletext decode function and 8M FLASH (N103) and 1M SRAM, there can deposit 250 page teletext. It has 10 VIDEO input, 3 VIDEO output, 3 SOUND input and output, analog RGB output, ITU656 of digital signal output. - Page 13 SCART_R AIN1L SCART_G AIN2R SCART_B AIN2L AIN3R 656I07 AIN3L 656I06 AOUT1R 656I05 AOUT1L 656I04 SAPEAKEAR 656I03 SAPEAKEAL 2.MST518 digital image processing MST519VA (N202) is digital image processing chip, it process the YPBPR, VGA, DVI signal and the ITU656 signal from VCT4993 (N102), through auto ADC correction and internal arithmetic processing, then outputs 24 BIT TTL level RGB signal to socket X202.
- Page 14 3. STR-W6856N switch adjustment IC Figure 1-3STR-W6856N internal 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 Function Function Function 2, 5 Input MUTE GND(output) 7, 12 Output GND(input)
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Page 15: Wiring Diagram
Wiring diagram... -
Page 16: Assembly List
Remote controller 301-U20S15-42R 301-U20S15-42R 301-U20S15-42R 301-U20S15-42R Speaker assy 615-20448-00 615-20448-00 615-20506-00 615-20448-00 Stand assy 615-10483-03 615-10541-00 615-10604-00 615-10588-01 LC-20S3 LC-15S3 NAME Main board 667-L20S3-01 667-L15S3-01 IR receiving board 667-L20Y3-09 667-L15Y3-09 Keys board 667-L20S3-05 667-L15S3-05 Backlight assy 667-L20H3-14A 667-L15H3-14C Power supply board... -
Page 17: Identification Criteria For The Bright Spot And Dark Spot Of The Lcd Screen
Identification criteria for the bright spot and dark spot of the LCD screen quantity allowed Distance between two spots Category criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright ≥15mm spot neighboring... -
Page 18: Troubleshooting
Trouble shooting 1. Fault clearance Before servicing please check to find the possible causes of the troubles according to the table below. 1.1 Antenna (signal): Picture is out of focus or jumping Bad status in signal receiving Poor signal Check if there are failures with the electrical connector or the antenna. - Page 19 signal types. Picture too bright and there is Check if the contrast setting is too high. distortion in the brightest area 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.
- Page 20 6: PWM LC-23S25 AN5277, single audio X401 1, 2, 3: +20V; 4, 5, 6: GND amplifier, Vcc=18V 7: STANDBY 8: +3.3V LC-20S3 AN5277, locates on X702 1,2: +12V 3, 4: GND 5,6: +18V main board, Vcc=18V 7,8: GND 9: PBIAS 10: PWM 2.1 No raster, no picture and no sound...
- Page 21 2.2 With picture and without sound when turning on: Increase volume; Check sound channel of VGA and check whether every YPBPR is normal. channel has no sound Check whether the signal VCT4993 (IC) or peripheral circuit output by VCT4993(IC) is does not work normally normal Sound...
- Page 22 2.4.2 The power board of 20”: Replace the fuse and check Power board damages Replace N501, D501 whether N501, D501 or fuse blows breakdown Check whether C512 has 18V Replace D502 Check whether pin1 of N501 has wave Check whether N502 is damaged Replace N502 Check whether N505, D507 is Check whether N505 is...
- 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...