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Roadstar LCD7080DVBT Service Manual
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Roadstar LCD7080DVBT Service Manual

7 inch lcd color monitor & dvb-t
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Summary of Contents for Roadstar LCD7080DVBT

  • Page 2: Table Of Contents

    CONTENTS 1 Specification .............…........2 Block Diagram .........…............. 3 General Alignment Instruction .............. 4 Troubleshooting ..................5 Printed Circuit Board ................1 6 Explode View ..................7 IC Block Diagram and Lead Identification ......... 8 Schematic Diagram ................1 .

  • Page 3: Specification

    SPECIFICATION Description Condition Unit Limit Nominal Result Vp-p 0.7 0.1 Video Signal Level Vp-p 0.3 0.1 SYNC Lever 75% collr bar,75ohm Vp-p 1.0 0.2 Video out lever Video out lever Vp-p 1.0 0.2 Audio 1.4 0.2 1.25-1.4 1KHz/0dB out lever Signal-to-noise ratio Infinity Zero/-&dB/l&R...

  • Page 4: Block Diagram

    BLOCK DIAGRAM ..CCIR0 ..656-D0 656-D0 CCIR7 Vx1827 7 INCH 656-D7 656-D7 PANEL A 8430 TRAN HIGH VOLTAGE M 1206 MAIN PART . 3 .

  • Page 5: General Alignment Instruction

    GENERAL ALIGNMENT INSTRUCTION The Main PCB of Monitor Modification: 1. Input voltage is 6.8V-16V, input signal is test circuit BY 5418. 2. Adjust VR1 to get good performance. . 4 .

  • Page 6: Troubleshooting

    TROUBLESHOOTING SYMPTOM CAUSE REMEDY LCD MONITOR PART & Defective IC U2(VX1827) & Replace U2(VX1827) 1) NO Picture & Defective C256 2) NO Picture & Replace C256(10P/3000V) 3) No Picture, Picture no & Replace IC At8430 Cw3406 & Defective IC At8430 Cw3406. Good 4) Luminesce no good &...

  • Page 7: Printed Circuit Board

    PRINTED CIRCUIT BOARD Monitor HV PCB Top View Bottom View . 6 .
  • Page 8 PRINTED CIRCUIT BOARD Main PCB Top View . 7 .
  • Page 9 PRINTED CIRCUIT BOARD Main PCB Top View . 8 .

  • Page 10: Explode View

    EXPLODED VIEW . 9 .
  • Page 11 IC BLOCK DIAGRAM & DESCRIPTION Vx1827 . 10 .
  • Page 12 IC BLOCK DIAGRAM & DESCRIPTION Vx1827 . 11 .
  • Page 13 IC BLOCK DIAGRAM & DESCRIPTION A8430EEK . 12 .
  • Page 14 8D02D IC BLOCK DIAGRAM & DESCRIPTION S8232 . 13 .
  • Page 15 8D02D IC BLOCK DIAGRAM & DESCRIPTION 24C02 . 14 .
  • Page 16 8D02D IC BLOCK DIAGRAM & DESCRIPTION CS4334 . 15 .

  • Page 17: Schematic Diagram

    SCHEMA TIC DIAGRAMS TFT-POWER . 16 .
  • Page 18 SCHEMA TIC DIAGRAMS VX1827 . 17 .
  • Page 19 SCHEMA TIC DIAGRAMS PANEL . 18 .
  • Page 20 SCHEMA TIC DIAGRAMS CHANGE . 19 .
  • Page 21 SCHEMA TIC DIAGRAMS POWER . 20 .
  • Page 22 SCHEMATIC DIAGRAMS CT212 . 21 .
  • Page 23 SCHEMA TIC DIAGRAMS AV-OUT . 22 .