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akira LCT-20PSST Service Manual

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Summary of Contents for akira LCT-20PSST

  • Page 1 LCT TV Service Manual...
  • Page 2 -2 - Model No.: LCT-20PSST Version: 1.0...

  • Page 3: Table Of Contents

    METHOD OF SOFTWARE UPGRADING .................... 9 BLOCK DIAGRAM ..........................13 IC BLOCK DIAGRAM ......................... 14 WIRING DIAGRAM ..........................18 INDENTIFICATION CRITERIA FOR THE BRIGHT SPOT & DARK SPOT........19 TROUBLE SHOOTING ........................26 EXPLODED VIEW..........................31 PART LIST ............................. 32 Model No.: LCT-20PSST Version: 1.0...

  • Page 4: Safety Precautions

    Please wait at least one minute before the pulling out or plugging in the connection wire. Model No.: LCT-20PSST Version: 1.0...
  • Page 5 When dismantling or mounting the protective partition plate that is used for anti vibration and insulation please take care to keep it in intactness so as to avoid hidden trouble. Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting. Model No.: LCT-20PSST Version: 1.0...

  • Page 6: Alignment Instruction

    Connect to central signal source; check if various TV functions (station skipping, modulate quantity control etc), check if the output of earphone and speaker are normal Input AV/S signal and HDTV signal; check various functions under AV/S terminal Model No.: LCT-20PSST Version: 1.0...
  • Page 7 Input gray (H)-8 signal, using the CA-210 test the third level, 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 = 0.28 ± 0.02, y = 0.299 ± 0.02. Model No.: LCT-20PSST Version: 1.0...
  • Page 8 74.250 28.125 1920 x 1080 @ 60i 74.250 33.750 For factory preset. Table3: Factory preset Item Factory Preset Item Factory Preset Picture mode NATURE OSD language English Sound mode User Color temperature Standard Volume Backlight Model No.: LCT-20PSST Version: 1.0...

  • Page 9: Method Of Software Upgrading

    1. Using the parallel port wire and DVI transfer to VGA connection wire and then connect them by an 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: Model No.: LCT-20PSST Version: 1.0...
  • Page 10 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, Model No.: LCT-20PSST Version: 1.0...
  • Page 11 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 flash to rewrite. Model No.: LCT-20PSST Version: 1.0...
  • Page 12 ITU656 signal from VCT4993 (N102), though auto ADC correction and internal arithmetic processing, then outputs 24 BIT TTL level RGB signal to socket X202. through N501 cable, the signal is sent to LCD panel interface to perform reproduction of image. Model No.: LCT-20PSST Version: 1.0...

  • Page 13: Block Diagram

    -13 - BLOCK DIAGRAM Model No.: LCT-20PSST Version: 1.0...

  • Page 14: Ic Block Diagram

    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. Figure 1-1: VCT4993R internal block diagram Model No.: LCT-20PSST Version: 1.0...
  • Page 15 ITU656 signal from VCT4993 (N102), through auto ADC correction and internal arithmetic processing, then outputs 24 BIT TTL level RGB signal to socket X202. Through N501 cable, the signal is sent to LCD panel interface to perform reproduction of image. Model No.: LCT-20PSST Version: 1.0...
  • Page 16 DDC_SDA 127-128 HSYNC XOUT VSYNC Figure1-2: MST518 internal block diagram Analog RGB0 Display Multi-Format Processing Panel To Panel Analog RGB1 Engine Interface Dual Analog Interface HSYNC/VSYNC Engine Clock HOST Video Port ITU656 interface XTAL/EXT CLK Model No.: LCT-20PSST Version: 1.0...
  • Page 17 Figure 1-3: STR-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) Model No.: LCT-20PSST Version: 1.0...

  • Page 18: Wiring Diagram

    -18 - WIRING DIAGRAM Model No.: LCT-20PSST Version: 1.0...

  • Page 19: Indentification Criteria For The Bright Spot & Dark Spot

    3. Definition of dark spot: It is identified as a dark spot if it is dark in the state of while field and it dark size remains unchanged. 4. Definition of two neighboring points: Defect of a group of picture elements (RB, RG, GB). Model No.: LCT-20PSST Version: 1.0...

  • Page 20: Troubleshooting

    There appear streaks or light Check if interfered by other equipment and if color on the screen interfered possibly by the equipment like transmitting antenna, non-professional radio station and cellular phone. Model No.: LCT-20PSST Version: 1.0...
  • Page 21 There appears an indication- Check if the TV set can receive input signal. The “outside the receivable scope) signal is not correctly identified and VGA format is beyond the specified scope. Model No.: LCT-20PSST Version: 1.0...
  • Page 22 TV. picture In this case please press “auto” key on the remote control so as to enable the liquid crystal TV set to recheck the signal and then to display correct picture signal. Model No.: LCT-20PSST Version: 1.0...
  • Page 23 Whether the backlight Backlight board damage or protection. power or PBIAS pin Replace the backlight board is normal Check power circuit or whether the VCT4993I PBIAS signal is normal Model No.: LCT-20PSST Version: 1.0...
  • Page 24 Confirm the +5V, +32V power supply of TUNER. If they are normal, check whether peripheral circuit of the TUNER or IF amplifier is normal. If they are all no problem, then VCT4993 or its input signal is abnormal. Model No.: LCT-20PSST Version: 1.0...
  • Page 25 Replace D502 C512 has 18V Check whether pin1 of N501 has wave Check whether Replace N502 N502 is damaged Check whether Check whether Replace N505, D507 is N505 is damaged N505 damaged Replace the damaged parts Model No.: LCT-20PSST Version: 1.0...

  • Page 26: Trouble Shooting

    -26 - CIRCUIT DIAGRAM Model No.: LCT-20PSST Version: 1.0...
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  • Page 28 -28 - Model No.: LCT-20PSST Version: 1.0...
  • Page 29 -29 - Model No.: LCT-20PSST Version: 1.0...
  • Page 30 -30 - Model No.: LCT-20PSST Version: 1.0...

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