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XOCECO LC-23K7 Service Manual

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COLOR TELEVISION
LC-23K7

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Summary of Contents for XOCECO LC-23K7

  • Page 1 COLOR TELEVISION LC-23K7...

  • Page 2: Table Of Contents

    CONTENTS Safety instructions………………………………………………………………………..… Adjustment instructions …………………………….…….…………………………….… Trouble shooting ……………………………………………………….…………………… Method of software upgrading ………………………………………….…….…………… LC-23K7 working principle analysis……………………………….………….…………. LC-23K7 block diagram…………………………………..……………………….………… IC block diagram………………………………………………………………………..…… Main assembly……………………………………………………………………………..… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Wiring diagram ……………………………………………………………..……………...

  • Page 3: Safety Instructions

    This service manual is only for service personnel to take reference with. Before Attention: servicing please read the following points carefully. Safety instructions 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.

  • Page 5: Adjustment Instructions

    Alignment instruction 1 Alignment 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 FLASH To produce CPU board and analog board Check the CPU board and analog board All testing Connect with central signal source, then check each function of TV such as analog control etc., check the output of headphone and speaker...
  • Page 6 3.1 EEPROM initialization Enter the first page of factory menu, select “clear eeprom” and then press “enter”, shut down the unit after “ok” appears. 3.2 VGA/DVI channel adjustment 3.2.1 Preset VGA channel mode Input VGA signal (PATTERN 5: Final Test) of K-7253, select TIME301(640*350/70Hz), press “AUTO”...

  • Page 7: Trouble Shooting

    offset_R, offset_G,offset_B, gain_R and gain_G, repeatedly using the same method until the value of the two levels gray-scale be the specified value. 3.4 white balance adjustment YPbPr channel input YpbPr signal of K-7253 to YPbPr-1 terminal, input TIME380(480i) PATTERN471 8 level gray-scale signal, set the value of S-bright to 120 and S-contrast to 140.Enter adjustment menu of white balance, adjust the third level using white balancer.
  • Page 8 Fringe in picture Check if the antenna is correctly oriented. Maybe there is electric wave reflected from hilltop or building. Picture is interfered by stripe Possibly due to interference from automobile, train, high shaped bright spots voltage transmission line, neon lamp etc. Maybe there is interference between antenna and power supply line.

  • Page 9: Method Of Software Upgrading

    darkest area of the picture Possibly the brightness grade of DVD player (broadcaster) is set too high. No picture or signal produced from the Check if the cable is disconnected. displayer if “XXX in search” appears. Check if it’s connected to the proper terminal or if the input mode is correct.
  • Page 10 FlashUpgraderNT (use under window 2000/XP/NT) FlashUpgrader (use under window 98), The following interfaces will show up after running the program: Based on the computer features, set up the serial port (COM Port). Select corresponding serial port (if it’s unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then select Reset Target After Download.

  • Page 11: Lc-23K7 Working Principle Analysis

    LC-23K7 working principle analysis Please refer to LC-23K7 BLOCK DIAGRAM in order to know the working principle of LC-23K7 brief introdection to its signal flow is shown as follows: RF signal produces composite color television signal through TUNER201, the signal together with AV1/SVHS(SVHS priority), AV2 etc.

  • Page 12: Lc-23K7 Block Diagram

    LC-23K7 BLOCK DIAGRAM U15 DVI DRIVER 24bit TFP501 LVDS DRIVER 24bit TUNER DS90C385A SCALER JAG-ASM 24bit DEINTER ITU-R656 LACER AV1-V/S-Y 8bit FLI2310 SVHS-C AV2 -V SDRAM SDRAM SDRAM AV-V OUT I IC BUS U32 CCD V-CHIP FLASH Z86229 MEMORY MICRO-...

  • Page 13: Ic Block Diagram

    IC block diagram 1.MSP3420 Pins description: 2,3 PIN: SCL,SDA applied for control the operation of IC . 27,28 PIN: output left and right sound channel R/L to speaker processor. 36,37 PIN:AV OUT of sound R/L. 47,48 PIN:D4-1/D4-2/PCMCIA selected input R/L. 50,51 PIN:Input of VGA.
  • Page 14 2.VPC3230 Pins description: 4 PIN: Input U of PCMCIA. 5,73 PIN: Input Y of PCMCIA. 6 PIN: Input V of PCMCIA 31-34, 37-40 PIN: output format signal of. ITU-R656 70 PIN:Video of AV OUT 71 PIN:Input C of SVHS. 72 PIN:input Video (SVHS in priority) of Y or AV1 of SVHS. 74 PIN:input Video of AV2.
  • Page 15 3.AD9883...
  • Page 16 4.FLI2310-Simplified Internal Block Diagram...
  • Page 17 5.JAG-ASM...
  • Page 18 6.Z86229 Pins description: 7 PIN: VDIEO INPUT 2 PIN: G OUTPUT 3 PIN: B OUTPUT 18 PIN: R OUTPUT 17 PIN: FB OUTPUT...

  • Page 19: Main Assembly

    Main assembly NAME MAIN COMPONENT AND it’S NO. Sound conversion board 667-L27K6-15 N201 MSP3420G-Q (353-34200-10) N203 M62494FP (353-62494-20) N213 N214 MP7720 (353-77200-10) CPU board 667-L23K6-56R JAG-ASM (353-0JAG0-00) FLI2310 (353-23100-00) TFP501 (353-05010-00) VPC3230D (353-32300-80) MST9883B (353-98830-10) DS90C385 (353-03850-20) Z8622912SS (353-86229-10) TSC80251G2D (353-80251-10) AT49F002NT (352-49002-70)

  • Page 20: 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 Q’ty 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 2 neighboring ≤2...

  • Page 21: Wiring Diagram

    Wiring diagram...

  • Page 22: Troubleshooting Charts

    Troubleshooting charts 1. No raster Turn-on power supply, check if the red indicator is light in the STANDBY? blue Check PIN6-8(24V output) of Check the indicator in the power supply board X903 turn-on condition Check if the indicator is flicker Non-change color in the sensor control normal condition?
  • Page 23 2. raster, but no picture Check if the unit Check can operation? channels have signal? Which is no VGA/DVI Replacing CPU Enter factory-menu, signal board operation CLEAR channels EEPROM, then turn YPRPB Replacing off , turn on again , it if CPU board display picture.
  • Page 24 3.no sound Check if PIN1 is level 1/2VCC(12V) of N213 Check PIN5 Replacing N213 and N214 PIN8 output of N203 and N214 Check power supply Check PIN27 PIN28 output wave of Replacing N203 N201 Check PIN67 wave of N201 Replacing N201 Replacing TUNER202...
  • Page 29 L23K7-20 （OLD）原理图...
  • Page 30 L23K7-20 (NEW)原理图...

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