Related Manuals for XOCECO LC-27W18S
Summary of Contents for XOCECO LC-27W18S
- Page 1 COLOR TELEVISION LCD-W# series LC-27W18S, LC-27W25S LC-32W18S, LC-32W25S LC-37W18S, LC-37W25S LC-42W17S...
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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 PM5515 (Video signal generator) PM54200(SCART signal generator) VG-848(YUV, VGA and DVI signal generator) K-7253 (VGA signal generator) CA210 (White balancer) 2. The alignment flow chart (see below figure) Check DDC and FLASH Production of data processing board and analogue board on the line. - Page 6 4 EEPROM initialization Enter the first page of factory menu, select “EEPROM INITIALIZE” to be “on”, after turn off the unit, repeating turn on the unit is over. 5 white balance adjustment Input PAL signal of 16-level gray-scale (TIMING969 PATTAN921) from VG848 to AV channel, enter user menu, set color to 0, APL to “off”, enter factory menu white balance adjustment page, select color temperature, fixed the GGAIN to 50H, adjust BGIAN and RGAIN to 400nits, then the color coordinate to 284, 299.
- Page 7 Input signal in the TV/AV/S states, connect the SCART2 terminal to the TV. Change the unit channel, check if output signal of SCART2 is current signal, and the image and sound is normal. 6.4 YPbPr/YPbPr terminal Input the YUV signal (VG-848 signal generator), separate input YUV format signal of table 1, check if the image and sound is normal.
- Page 8 /Greek/Arabic/Hebrew Dynamic Scart Note: the latter 6 items should set according to clients’ require. TABLE 4 Factory Audio Setting Ex-factory setting Items LC-27W18S/27W25S LC-32W25S LC-37W25S LC-42W17S Volume 1 Volume 25 Volume 50 Volume 75 Volume 100 HP VOLUME SETTING Volume 1...
- Page 9 D/K select HDEV3 Equalizer Bands Max Spatial Mode Spatial Strength TABLE 5 Factory Video limit Setting Items CVBS SC-RGB YPBPR D-SUB HDMI Bright Min Bright Middle Bright Max Contrast Min Contrast Middle Contrast Max Sharpness Min Sharpness Middle Sharpness Max Color Min Color Middle Color Max...
- Page 10 B Offset R Gain G Gain B Gain Brightness Contrast Color Temperature Cold R Offset G Offset B Offset R Gain G Gain B Gain Brightness Contrast Color Temperature Warm TABLE 7 Image analog setting CVBS Vivid Standard Mild Custom Contrast Brightness Color...
- Page 11 HDMI Vivid Standard Mild Custom Contrast Brightness Color Sharpness Note: in factory menu states, it can change the factory mode to value of the image and sound, else select the image and sound balanced value in the other states. TABLE9 SOUND equilibrium value setting Live Rock Custom...
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Page 12: Method Of Software Upgrading
Method of software upgrading 1. Enter the software upgrading state of the TV Method 1: press the VOL- button in the unit, turn on the main power switch, then the screen display black screen, but the indicator to blue. Method 2: Enter factory menu, select the IIC-BUS OFF item. 2. - Page 13 5. Select WRITE DEVICE item of the device menu, till the right screen display “DONE”. 6. turn off the power , restart the unit. Note: because of the software, it may be no-stabilization, the software can auto download and write. Upgrading tools Connection cable...
- Page 14 Upgrading port 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 flash to rewrite.
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Page 15: Working Principle Analysis Of The Unit
Working principle analysis of the unit 1. Analog signal flow Antenna reception signal send to integrative tuner (contain HF and IF amplifier circuit), the tuner is controlled the command (SDA and SCL) of the MCU N301 (M16C), select appropriate channel to system switch, via HF amplifier and IF amplifier decode, output video signal of 2VPP and sound signal of 1VPP. -
Page 16: Block Diagram
Block diagram... -
Page 17: Ic Block Diagram
IC block diagram 1. Sound processing IC (MSP3410) Sound signal send to sound processing N801 MSP3410, and dual-circuit tuner has second SIF, it sends to N801 (stereo decode and auto volume control), N801 has audio channel switch, after switching in N581 (HEF4052BT), the audio input of VGA/HDMI/YPbPr will be sent to N801 together with the audio signal of TV and AV to do the switching process. - Page 18 2. Sub-channel and SCART video signal decode IC (TVP5147) Sub-tuner TUNER202 decode video, AV, S-VIDEO, SCART1 video, SCART2 video and Y/C signal, after matching impedance, enter decoding IC N601 (TVP5147), so the PIP image of sub-channel can selecting arbitrary video signal. MSP3410 internal block diagram as follow: TVP5147 main pins instructions: 28, 29: SCL, SDA...
- Page 19 3. Reception HDMI signal (SiI9011) After differential signal of HDMI send to N405 (SiI9011), then it transform 24bit for video digital signal, and sent to IC N101 (SVP-EX52) processing. SiI9011 internal block diagram as follow: 4. Main decode and processing IC(DPTV-SVP-EX52) SVP-EX52 internal block diagram as follow:...
- Page 20 SVP-EX52 main pins instructions: 14, 16: SCL, SDA 10, 11: VGAHS, VGAVS input, 244, 231: EX52_Y and EX52_C input 243: main tuner video signal input 242: video signal input for Scart1 226, 248, 233: Scart1 RGB input 246, 232, 225: EX52_YUV input 236, 237: video output for SCART2...
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Page 21: Wiring Diagram
Wiring diagram... -
Page 22: Assembly List
Assembly list LC-27W18S/LC-27W25S Name Part No. Main IC and No. Data processing board 667-L27W18-69 N101 DPTV-SVP-EX52 (353-DPTV0-20) N201 K4D2632838F (353-26323-10) N302 W29C040P-90B (353-29040-30) N301 M30620SPGP (353-30620-20) N601 TVP5147PFP (353-51470-10) N405 SiI9011CLU (353-90110-10) N403 CS4344CZZ (353-43440-10) Audio processing board 667-L27W18-15 TUNER201 JS-6B2/122A2-A2 (590-40512-00) - Page 23 Power supply board 667-L32K5-20A LC-37W18S/LC-37W25S Name Part no. Main IC and no. Data processing board 667-L37W25-69 N101 DPTV-SVP-EX52 (353-DPTV0-20) N201 K4D2632838F (353-26323-10) N302 W29C040P-90B (353-29040-30) N301 M30620SPGP (353-30620-20) N601 TVP5147PFP (353-51470-10) N405 SiI9011CLU (353-90110-10) N403 CS4344CZZ (353-43440-10) Audio processing board 667-L32W25-15 TUNER201 JS-6B2/122A2-A2 (590-40512-00) TUNER202 JS-6B2/121A2 (590-40511-00)
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Page 24: 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 25: 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 26 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.
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Page 27: Troubleshooting Guide
2. Troubleshooting guide Connect the power A red indicator lights? Check Power supply, infra-red board, CPU and its periphery circuit (flash) and power cord Yes, turn the unit on Check if the pin 42 of CPU is square-wave; check A blue indicator lights? the periphery circuit of CPU and FLASH/SRAM Check backlight board, CPU pin 77-backlight Does backlight light up... - Page 28 Check if pin 42 of Check N301 and its reset circuit，especially N301is square-wave check the critical components namely V301and D302 Check N301 and its crystal Check the periphery circuit of oscillation N301,N3022 and N303 NOTE: When pin 10 of N301 is low level, remove V301 and then check the correspondent pins of N301are high level or not, the reset circuit fails to work properly if it is high level.
- Page 29 ( 3) No picture but with sound( only backlight lights up) Sound only with raster Check if the power supply of LVDS is normal or not Normal Abnormal Check the signal outputted from Check pin 5 of N705 or pin 2 and N101 to X189 is normal or not 4 of N715 is low level or not Normal...
- Page 30 Check periphery circuit Check there have signals of power amplifier’s inputted from R827 and R824 to back level power amplifier Check if correspondent Check periphery circuit of power channels of N801 amplifier, power supply circuit and have input signal circuit of pin MUTE Check periphery circuit of Follow the direction of audio N801，...
- Page 31 Check periphery circuit of There exits problems at the N506 and power supply circuit place from socket of S terminal to N506 c), TV channel with no picture Firstly find out which frame fails to work properly making use of the PIP function, PIP frame or Main frame.
- Page 32 Check Check N601 Check Check N101 TUNER202 surrounding circuit surrounding between surrounding circuit, crystal circuit, crystal circuit, power oscillation and TUNER202 oscillation and and N601. supply and bus power supply. power supply. d) No picture in SCART1 mode Measure whether there signal input...
- Page 33 Measure and check whether there is signal input to Check N101 surrounding N506 pin 3 and pin 6. circuit, crystal oscillation and power supply. Check N506 surrounding circuit and There is trouble at the path from power supply SCART2 socket to N506. f) No picture at YPbPr or YCbCr mode Measure whether there is signal input to C173, C174,...
- Page 34 Check according to procedure Measure whether N101 pin10, pin 11 have Sync signal input. There is trouble at the path Measure whether there is sync signal input to N501 pin 1 and between VGA socket and pin 5 N507. Check N501 surrounding circuit There is trouble at the path and power supply.
- Page 35 Measure and check whether N581 pin Check according to procedure 1, pin 12 have signal input. (4). Check whether N403 pin7 Check N581 surrounding pin10 have output circuit power signal. supply. Check path Check whether between N403 and N403 pin1&2&3&4 N581.
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Page 36: Schematic Diagram
Schematic diagram...