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Acer AC 711 Service Manual

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1. DISPLAY ALIGNMENT .................................................................................. 2
A. TIMING & DISPLAY SIZE ................................................................................................................ 2
B. PICTURE POSITION ....................................................................................................................... 2
C. LINEARITY ..................................................................................................................................... 2
D. ALIGNMENT PROCEDURE ............................................................................................................. 2
E. GEOMETRIC DISTORTION............................................................................................................. 3
F. WHITE BALANCE ALIGNMENT ....................................................................................................... 4
2. CONTROL AND CONNECT LAYOUT .......................................................... 7
A. MAIN PCB ...................................................................................................................................... 8
C. PIN ASSIGNMENT.........................................................................................................................10
3. INTRODUCTION: ......................................................................................... 11
A. POWER SUPPLY ........................................................................................................................... 11
B. DEFLECTION: ............................................................................................................................... 11
C. VIDEO: .......................................................................................................................................... 11
D. DIGITAL CONTROLLOR: ............................................................................................................... 11
4. POWER SUPPLY .........................................................................................12
A. RECTIFIER AND FILTER CKT: ........................................................................................................15
B. FLYBACK AND PWM CKT : ............................................................................................................15
C. SNUBBER CKT: .............................................................................................................................15
D. SYNCHRONIZED CKT: ..................................................................................................................15
E. POWER SAVING CKT: ...................................................................................................................15
F. DEGAUSS CKT: .............................................................................................................................16
G. OVERLOAD PROTECTION CKT: ....................................................................................................16
5. DEFLECTION...............................................................................................14
A. SYNC RPOCESSOR: .....................................................................................................................17
B. HORIZONTAL PROCESSOR..........................................................................................................17
C. VERTICAL OUTPUT ......................................................................................................................17
D. HORIZONTAL OUTPUT STAGE .....................................................................................................17
E. FLYBLACK TRANSFORMER..........................................................................................................17
6. VIDEO AMP. CIRCUIT .................................................................................17
A. VIDEO PRE. AMP. ..........................................................................................................................20
B. VIDEO AMPLIFIER.........................................................................................................................20
7. TROUBLESHOOTING.................................................................................19
A. POWER SUPPLY CHECK ..............................................................................................................22
B. MONITOR CHECK FLOW CHART..................................................................................................23
APPENDIX A: PART LIST .............................................................................23
APPENDIX B: P. C. B. ASSEMBLY ..............................................................73
APPENDIX C: DISPLAY UNIT ASSEMBLY ...............................................108
APPENDIX D: CRT & YOKE ASSEMBLY ..................................................122
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  Summary of Contents for Acer AC 711

  • Page 1: Table Of Contents

    1. DISPLAY ALIGNMENT ... 2 A. TIMING & DISPLAY SIZE ... 2 B. PICTURE POSITION ... 2 C. LINEARITY ... 2 D. ALIGNMENT PROCEDURE ... 2 E. GEOMETRIC DISTORTION... 3 F. WHITE BALANCE ALIGNMENT ... 4 2. CONTROL AND CONNECT LAYOUT ... 7 A.
  • Page 2: Display Alignment

    1. DISPLAY ALIGNMENT A. TIMING & DISPLAY SIZE For all presetting mode shall be within the limitation: H. WIDTH 310 ± 5mm V. HEIGHT 232 ± 3 mm The external control range of the data area, shall be as follows; Max.
  • Page 3: Geometric Distortion

    E. GEOMETRIC DISTORTION E-1 Raster Rotation Signal No.1 to 6 a - b 2.0 mm E-2 Pincushion Signal No.1 to 6 : d1 2.0 mm Bottom : b1 2.0 mm Leftside : a1 1.5 mm Rightside : c1 1.5 mm E-3 Barrel Signal No.1 to 6 : d2 2.0 mm...
  • Page 4: White Balance Alignment

    F. WHITE BALANCE ALIGNMENT F.1.1 Select timing #6 (VESA 68K 1024X768) with crosshatch pattern, adjust both horizontal and vertical OSD’s size control to get display size within 310x232p 2mm. F.1.2 Disconnect R.G.B. signal inputs, adjust OSD’s brightness and G1 control to it’s maximum position. F.1.3 Auto alignment(P103 must be short) Use automatic alignment equipment and program to get color temperature within specified coordinates.
  • Page 5 F.1.13 Fine tune the gain G and R for x=283 , y=297 ( x=299, y=315 for 7500; x=313, y=329, for 6500 ) F.1.14 Check 150 >Y> 130 cd/mm, if not , adjust G to get Y>130 cd/mm, then repeat item 2.5.12 F.1.15 Change pattern to fall white, adjust SB to get 92<...
  • Page 6: Preset Timing Chart

    G. PRESET TIMING Preset Timing Chart [ H-SYNC ] [ VIDEO ] [ V-SYNC ] [ VIDEO ] No Signal Name Clock (MHz) (kHz) (Hz) 25.175 31.469 59.940 640*480(60) VESA 56.250 53.674 85.061 800*600(85) VESA 94.500 68.677 84.997 1024*768(85) VESA 49.500 46.875 75.000 800*600(75) VESA...
  • Page 7: Control And Connect Layout

    2. CONTROL AND CONNECT LAYOUT...
  • Page 8: Main Pcb

    A. Main PCB...
  • Page 9 B. VIDEO PCB...
  • Page 10: Pin Assignment

    C. PIN ASSIGNMENT C-1. Connect Table P102 DETECT DDC-SCL DDC-SDA V-sync H-sync 5V from PC C-2. Connect Function P803 : H-CENTER CONN P501 : TILT CONN P103: PRESET CONN P902 : DEGAUSSING COIL CONN P804 : X-RAY TEST PAD P105-P202 P104-P203 V-OUT OSD-SDA...
  • Page 11: Introduction

    3. INTRODUCTION: C708 is a 17” multisync color monitor. The horizontal frequency range is from 30khz to 70khz, and the refresh rate is from 50hz to 160hz. The circuit includes four major parts, the power supply circuit, the deflection circuit, the video circuit and the digital control circuit. is the function block diagram.
  • Page 12 OSD DATA V-sawtooth V-scan to DY D/A Output from uP H.V. 25KV to CRT Dynamic Focus to CRT G2 Voltage 550V to CRT...
  • Page 13 Fig1...
  • Page 14 Fig2...
  • Page 15: Power Supply

    4. POWER SUPPLY A. RECTIFIER AND FILTER CKT: The 90Vac-265Vac input line voltage is rectified by BD901, and smoothed by C906 to provide DC operating voltage for the circuit. B. FLYBACK AND PWM CKT : When power is initially applied to the circuit,C909 charges through R903, Q902.When the voltage across C909 reaches a level of 16V, U901 is enabled, turning on Q903 and turning off Q902 to complete start-up action.
  • Page 16: Degauss Ckt

    F. DEGAUSS CKT: The DEGUSS signal which comes from micro-p to control degauss coil act or not. When DEGUSS is high, Q950 will be saturated to make RL901 working, AC line provides a degaussing current to degauss coil. G. OVERLOAD PROTECTION CKT: The primary current flows through the current sensing resistor R907.
  • Page 17: Deflection

    5. DEFLECTION A. SYNC RPOCESSOR: H-sync & V-sync input to U1(up), then up output the H-out, V-out signal to U401 TDA4856. The H-out, V-out always are positive. B. HORIZONTAL PROCESSOR Fig 3 is the block diagram of IC TDA4856. The IC TDA4856 output vertical sawtooth and H-Drive signal to produce, H.V deflection. Meanwhile TDA4856 output.
  • Page 18 Fig3...
  • Page 19 Fig4...
  • Page 20: Video Amp. Circuit

    6. VIDEO AMP. CIRCUIT A. VIDEO PRE. AMP. The video pre-amp IC is U201(LM1269). The input signal is 0.7Vpp, then pre-amp IC U201 amplify the video signal to 3~4Vpp. The U201 is controlled by up via I block diagram. B. VIDEO AMPLIFIER The video amplifier is U203(LM2467), it amplify video signal to about 40Vpp.
  • Page 21 Fig6 Fig7...
  • Page 22: Troubleshooting

    7. TROUBLESHOOTING A. POWER SUPPLY CHECK...
  • Page 23: Monitor Check Flow Chart

    B. MONITOR CHECK FLOW CHART B-1. No Raster...
  • Page 24 B-2. No Picture...
  • Page 25 B-3. No Vertical Deflection ( rester become a horizontal line)

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C708