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Related Manuals for XOCECO LC-26U26
Summary of Contents for XOCECO LC-26U26
- Page 1 LCD TELEVISION LC-26U26...
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Page 2: Table Of Contents
CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….……………………………….… Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………. …………………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………..……………... Troubleshooting………………………………………………………………………..…… Schematic diagram …………………………………………………………………….….. APPENDIX-A: Main assembly list APPENDIX-B: Exploded views... -
Page 3: Safety Precautions
Attention: This service manual is only for service personnel to take reference with. Before 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 Alignment flow-chart The alignment flow-chart is shown as fig-1 Check DDC, HDCP KEY and CPU Factory initialization setup IF channel voltage of TV and AGC voltage adjustment Support format of VGA pre-set Adjustment for sub-brightness and white balance of VGA/HDMI (color temperature 6500k, 9300k and 12000k) - Page 6 120-159 Adjustment for clock frequency (MHz) of memorizer, setting “145”. PIP Size Middle/Large Select two component of PIP: “SMALL AND MIDDLE” and “SMALL AND BIG”, setting “MIDDLE”. init EEprom Start? Eeprom Initialization (adjustment for EEprom data) 3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV Input frequency for 45.75MHz and IF signal for 80dBV of TP1, adjust L107 to value 2.4v of TP2;...
- Page 7 b. Switch YPbPR signal of VG-849 and VG-848 output to the eighth gray-scale signal of PROG973(1080i)PATTERN964. prset value of offset_R, offset_G and offset_B to 15 and gain-R, gain-G and gain-B to 25. adjust brightness, let second bright to 3nit at least. c.
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Page 8: Working Principle Analysis Of The Unit
Working principle analysis of the unit The RF signal received by antenna will be sent to tuner, then IF signal will be obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V104, then it will be sent to acoustic surface-wave Z103 to do IF filter and get better IF characteristics, then it will be sent to TV board N101 (M52760E) to do intermediate amplification, phase-locked loop VCO and synchronous wave detection to get composite video signal VIDEO;... -
Page 9: Block Diagram
Block diagram AUDIO HDMI-A AV-A OUT YPbPr-A NA02 VGA/DVI-A AUDIO HEF4052 PROCESSOR AUDIO AMP N801 AUDIO N401 AV1-A MSP3425G TPA3008D2 N701 AV2/S-A HEF4052 Z102 IF AMP TUNER SPEAKER N101(TV board) M52760E Z103 VIDEO AV-V OUT SCALER DECORDER VIDEO1 CCIR656 A/D D/A N601 Y/VIDEO2 8bit... -
Page 10: Ic Block Diagram
IC block diagram 1. TVP5160 The TVP5160 device is a high quality, digital video decoder that digitizes and decodes all popular baseand analog video formats into digital component video. The TVP5160 decoder supports the A/D conversion of component YPbPr and RGB (SCART) signals, as well as the A/D conversion and decoding of NTSC, PAL, and SECAM composite and S-Video into component YCbCr. - Page 13 2. M52760SP The M52760SP is IF signal-processing IC for VCRs and TVs. It enable the PLL detection system despite size as small as that of conventional quasi-synchronous VIF/SIF detector, IF/RF AGC, SIF limiter, FM detector and EQ AMP. FEATURES •Video detection output is 2VP-P. It has built-in EQ AMP. •The package is a 20-pin shrink-DIP, suitable for space saving.
- Page 14 3. MST6151 pins function: 207, 208: HDMI-R input 2, 3: HDMI-G input 5, 6: HDMI-B input 8, 9: HDMI-CLK input 14: HDMI-SDA 15: HDMI-SCL 20, 21: VGA-B input 22: VGA-G input 23, 24: VGA-G input 25, 26: VGA-R input 18: VGA H-sync input 19: VGA V-sync input 27, 28: PB input 29, 30: Y input...
- Page 15 4. MSP3425G...
- Page 16 5. TPA3008 FUNCTIONAL BLOCK DIAGRAM 1: MUTE 3: R input 5: L input 20, 17: L input 41, 44: R input 15, 23, 33, 39, and 47: +18V power supply...
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Page 17: Wiring Diagram
Wiring diagram... -
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 2. 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...
- Page 21 3. Troubleshooting guide 3.1. No raster Turn-on power supply, check if the red indicator is light in the STANDBY? Check if PIN8(5V) of CPU Press POWER button in the board is normal? unit button and sensor control, check the indicator. blue Check if the PIN12 of X503 in Check STANDBY circuit of...
- Page 22 3.2. Raster, but no picture Check if the unit button Does display remote control menu in screen when operation? press submenu? Check channels have signal? HDMI/VGA/YPRP Enter factory-menu, Which is no signal initialization EEPROM, of channels Replace CPU then turn off the TV, board turn on again, display Replace...
- Page 23 3.3.no sound Check if PIN15, PIN30 Check PIN26 and PIN38 voltage of PIN27 output wave of Replace N401 N401 is normal? N801 Check power supply Check PIN13 output wave of N101 Replace N801 Check PIN5 wave of Replace N101 Z102 Check PIN11 wave of TUNER1 Replace TUNER1...
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Page 24: Schematic Diagram
AV OUT board... - Page 25 key board...
- Page 26 POWER BOARD 667-L27U25-20...
- Page 27 IR board...
- Page 28 CPU board (page1 of 8)
- Page 29 LVDS&BK CPU board (page2 of 8)
- Page 30 POWER CPU board (page3 of 8)
- Page 31 SDRAM CPU board (page4 of 8)
- Page 32 TVP5160 CPU board (page5 of 8)
- Page 33 YPbPr&AUDIO SWITCH CPU board (page6 of 8)
- Page 34 CPU board (page7 of 8)
- Page 35 CPU board (page8 of 8)
- Page 36 video board (page1 of 2)
- Page 37 video board (page1 of 2)
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Page 38: Appendix-A: Main Assembly List
APPENDIX-A: Main assembly list LC-26U26 NAME MAIN COMPONENT AND it’S NO. Video board 667.L32U25-40 N101 M52760 (352.52760-10) N801 MSP3425G (353.34250-10) N401 TPA3008D2 (353.30080-10) CPU board 667.L26U26-56 N101 MST6151DA (353.61510-10) N601 TVP5160 (353.51600-10) NA01 CS4340 (353.43400-30) N801 MM502 (353.05020-10) Audio switch board (AV 667.L27U25-15... -
Page 39: Appendix-B: Exploded Views
APPENDIX: Exploded view (LC-27X26) - Page 40 PART LIST OF EXPLODED VIEW (LC-27X26) NO. PART NO. DESCRIPTION 780-X26W0-4F0 Front cabinet Screen 870-10391-00 LCD screen frame (top) 870-10393-00 LCD screen frame upright1 870-10395-00 LCD screen connection bracket1 863-60189U000 Power board frame 863-60188U000 Main board frame Power board assy CPU board assy 10 870-10397-00 Wall mount connection piece...
- Page 41 603-L26U260-10 Ver.1.0...
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