AOC 171S Service Manual
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AOC 171S Service Manual

17" lcd monitor
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AOC 171S/171S+

SERVICE MANUAL

17" LCD MONITOR
171S
171S+
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS
BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF
THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR CHANGES,
ERRORS OR OMISSIONS.
1

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  • Page 1: Service Manual

    AOC 171S/171S+ SERVICE MANUAL 17” LCD MONITOR 171S 171S+ THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR CHANGES,...

  • Page 2: Table Of Contents

    AOC 171S/171S+ Table of Content Revision List…………………………………………………………………………………………………………. 1. Monitor Specifications………………………………………………………………………………………….. 2. LCD Monitor Description……………………………………………………………………………………….. 3. Operating Instructions………………………………………………………………………………………….. 3.1 General Instructions…………………………………………………………………………………………... 3.2 Front Panel Control…………………………………………………………………………………….……... 3.3 Adjusting the Picture………………………………………………………………………………………….. 4. Input/Output Specification……………………………………………………………………………………... 4.1 Input Signal Connector……………………………………………………………………………………….. 4.2 Factory Preset Display Modes………………………………………………………………………………..

  • Page 3: Revision List

    AOC 171S/171S+ Revision List Version Date Revision History TPV Model Name T780KC4MDAACM Mar-17-06 Initial Revision T780KV4MDAACM...

  • Page 4: Monitor Specifications

    H-Frequency 30kHz – 80kHz V-Frequency 55-75Hz ON Mode ≤45W Power Consumption OFF Mode ≤2W 16.2M(6 Bit+ FRC) (for 171S) Display Color 16.77M colors (6bit+FRC) (for 171S+) 500:1 (for 171S) Contrast Ratio 600:1 (for 171S+) Dot Clock 135MHz 300cd/m (for 171S)

  • Page 5: Lcd Monitor Description

    AOC 171S/171S+ 2. LCD Monitor Description The LCD monitor will contain a main board, a power board and a keypad board which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

  • Page 6: Operating Instructions

    AOC 171S/171S+ 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located in front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.

  • Page 7: Adjusting The Picture

    AOC 171S/171S+ 3.3 Adjusting The Picture OSD TABLE: Sub Menu Main Menu Main Menu Sub Menu Adjust Description Reset Value lcon Item Icon Item Range Recall Cool Contrast Contrast from Digital-register. 0-100 Contrast Value Luminance Recall Cool Brightness Backlight Adjustment...
  • Page 8 AOC 171S/171S+ Adjust the horizontal position of H. Position 0-100 the OSD. Adjust the vertical position of the OSD Setup V. Position 0-100 OSD. OSD Timeout Adjust the OSD timeout. 10-120 Set OSD display language to English English. Set OSD display language to Deutsch German.

  • Page 9: Input/Output Specification

    AOC 171S/171S+ 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description Green Detect Table Blue Ground Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA connector layout...

  • Page 10: Factory Preset Display Modes

    AOC 171S/171S+ 4.2 Factory Preset Display Modes VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Frequenc Polarity Freq. Polarity Pixel Mode Resolution Total +/- 1 Hz Clock +/- 0.5kHz (MHz) 640x480@60Hz 800 x 525 31.469 59.940 25.175 640x480@72Hz 832 x 520 37.861...

  • Page 11: Power Supply Requirements

    AOC 171S/171S+ 4.3 Power Supply Requirement A/C Line voltage range 100 V ~ 240 V 50 ± 3Hz, 60 ± 3Hz A/C Line frequency range Peak surge current < 55A peak at 240 VAC and cold starting Leakage current < 3.5mA...
  • Page 12 AOC 171S/171S+ for 171S+...

  • Page 13: Optical Characteristics

    AOC 171S/171S+ 4.4.3 Optical Characteristics for 171S SYMBO ITEM CONDITION MIN. TYP. MAX. UNIT Contrast Ratio θ= ψ﹦0° Center θ= ψ﹦0° cd/m2 Luminance Uniformity θ= ψ﹦0° □L θ= ψ﹦0° Response Time θ= ψ﹦0° Horizontal 80/80 85/85 ψ CR≧5 Viewing Vertical...

  • Page 14: Electrical Characteristics

    AOC 171S/171S+ for 171S+ 4.4.4 Electrical Characteristics 1. TFT LCD Module: for 171S...
  • Page 15 AOC 171S/171S+ for 171S+ 2. Back Light Unit: for 171S for 171S+...

  • Page 16: Block Diagram

    AOC 171S/171S+ 5. Block Diagram 5.1 Monitor Exploded View...

  • Page 17: Software Flow Chart

    AOC 171S/171S+ 5.2 Software Flowing Chart...
  • Page 18 AOC 171S/171S+ 1) MCU initialize. 2) Is the EEprom blank? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode.

  • Page 19: Electrical Block Diagram

    AOC 171S/171S+ 5.3 Electrical Block Diagram 5.3.1 Main Board Crystal LCD Interface 20MHZ (CN503) (X601) Scalar IC TSU16AK W78E65 (Include ADC, OSD) (U601) (U401) EPR_SDA EPR_SCL H sync V sync EEPROM Key Board 24LC16B Control (U602) D-Sub Crystal 14.318MHZ Connector...

  • Page 20: Inverter/Power Board

    AOC 171S/171S+ 5.3.2 Inverter/Power Board AC input Bridge Rectifier Transformer Rectifier diodes EMI filter and Filter Start Circuit: R906、 R907 CN102 Feedback Over Voltage Circuit Control IC Protect ON/OFF OSC and DC Convert MOSFET Output Circuit Circuit Lamp Over ON/OFF...

  • Page 21: Schematic

    AOC 171S/171S+ 6. Schematic 6.1 Main Board 715L1237-1-3 TSU16AK SCHEMATIC GNDR GNDR GNDG GNDG DDC_CLK VCC2.5 VCC3.3 VAA1 VAA2 VAA3 VAA4 DDC_DAT GNDB GNDB ST_DET1 HSYNC HSYNC ST_DET2 VSYNC VSYNC VCC2.5 VCC3.3 VAA1 VAA2 VAA3 CLK+ CLK+ VAA4 CLK- CLK- 3.INPUT...
  • Page 22 AOC 171S/171S+ VCC5V+ VCC5V SOT-252 D202 VCC12V U201 R202 GS1D VCC2.5 VCC12V RT9164 CN201 　 1/16W VCC2.5 ON_OFF R201 4.7K 　 1/16W C210 C211 C212 VCC12V VCC12V D201 SS14 C201 R212 4.7K 　 1/16W 0.1uF 47uF/16V 0.1uF VCC5V+ VCC5V VCC5V...
  • Page 23 AOC 171S/171S+ CN301 DB15 FB301 　 1/16W R301 　 1/16W C304 0.047uF FB302 　 1/16W R302 　 1/16W C305 0.047uF FB303 　 1/16W R303 　 1/16W C306 0.047uF R304 　 1/16W C307 0.001uF PC5V R325 C301 C302 C303 VGA_CON 　...
  • Page 24 AOC 171S/171S+ VCC3.3 FB401 VCC2.5 FB402 VCC3.3 VCC2.5 600 OHM 600 OHM C405 C414 10uF/16V 10uF/16V VPLL VDVI VDPLL C406 C407 C408 C409 C410 C411 C412 C413 C415 C416 C417 C418 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...
  • Page 25 AOC 171S/171S+ PA[0..9] PA[0..9] LVA3P CN503 LVA3M LVACKP LVACKM LVB0M RXO0- RXO0+ LVB0P LVA2P LVB1M RXO1- RXO1+ LVB1P LVA2M LVB2M RXO2- RXO2+ LVB2P LVBCKM RXOC- RXOC+ LVBCKP LVA1P RXO3- RXO3+ LVB3M LVB3P LVA1M LVA0M RXE0- RXE0+ LVA0P LVA1M RXE1- RXE1+...
  • Page 26 AOC 171S/171S+ VCPU VCPU RN601 R601 R602 C601 RN602 　 1/16W 1/16W 　 　 1/16W 0.1uF 　 1/16W C602 22pF U601 X601 POWER EA/VP P0.0 ENTER P0.1 RIGHT XTAL1 P0.2 C603 20MHz LEFT P0.3 10uF/16V VCPU AUTO P0.4 U603 MAX810STR...

  • Page 27: Power Board

    AOC 171S/171S+ 6.2 Power Board 715L1103- 217A...
  • Page 28 AOC 171S/171S+...

  • Page 29: Pcb Layout

    AOC 171S/171S+ 7. PCB Layout 7.1 Main Board 715L1237-1-3...

  • Page 30: Power Board

    AOC 171S/171S+ 7.2 POWER BOARD 715L1103-217A 7.3 Key Board 715L1222-B...

  • Page 31: Maintainability

    AOC 171S/171S+ 8. Maintainability 8.1 Equipments And Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.

  • Page 32: Trouble Shooting

    AOC 171S/171S+ 8.2 Trouble Shooting 8.2.1 Main Board No power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the Adapter/Inverter section Measure U201 PIN2=2.5V U202 PIN2=3.3V...
  • Page 33 AOC 171S/171S+ No picture (LED orange) No picture The button if X601 oscillate Replace X601 under control waveform is normal Check reset circuit of Check Correspondent component U601 is normal Measure U201 PIN2=2.5V U202 PIN2=3.3V Replace U601 Replace U201, U202...
  • Page 34 AOC 171S/171S+ White screen White screen Measure Q204 base X601 oscillate waveform is normal is low level? Replace X601 Check Q204 is broken or Check reset circuit of CN503 solder? U601 is normal Check Correspondent Check Correspondent component. component. Replace PANEL...

  • Page 35: Power/Inverter Board

    AOC 171S/171S+ 8.2.2 Power/Inverter Board 1) No power Check CN102 pin12 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin3 of IC901...
  • Page 36 AOC 171S/171S+ 2.) No Backlight Check CN102 pin12 =12V Check adapter Check ON/OFF signal Check Interface board or main board Check U201 pin9=12V Change Q201 or Q202 Check U201 PIN10,7 have the output of sawtooth wave at short time Change U201 Check D201(-), D202(-) have the output of square wave at short time.

  • Page 37: Keypad Board

    AOC 171S/171S+ 8.2.3 Keypad Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Replace Key Pad Board Is Key Pad Board normally? Check Main Board...

  • Page 38: White-Balance, Luminance Adjustment

    6500 color temp. parameter is x = 313±20, y = 329 ±20, Y =180 cd/m 3. Into factory mode of AOC 171S (171S+) Turn on power, press the MENU button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel.

  • Page 39: Edid Content

    AOC 171S/171S+ 10. EDID Content 112:...

  • Page 40: Bom List

    AOC 171S/171S+ 11. BOM List T780KC4MDAACM—171S T780KV4MDAACM—171S+ Location Part No. for TPV Description Quantity Unit Remark CBPC780KC4AC CONVERSION BOARD for 171S CBPC780KV4AL CONVERSION BOARD for 171S+ KEPC780KAC KEY BOARD PWPC7425A3E27C POWER BOARD for 171S PWPC7425A3E14C POWER BOARD for 171S+ 15G5786 1...
  • Page 41 POWER LENS 33G4695 1 C CLAMP 34G1271RQ1A1L FRONT PANEL 34G1273 GM L STAND 37G 489 1 HINGE ASS'Y Q1G1030 8128 SCREW Q1G1030 10128 SCREW 95G801830630 ( for 171S) 33F 205 24 A2005H02-2*12P 33F 303 30TD1 TD00-30H P2407P30 33F205T 24 A2005T0B-00...
  • Page 42 AOC 171S/171S+ 33F303TTD1 TD00-T CBPC780KC4AC AIC780KC4AC MAIN BOARD 40G 45762412B CBPC LABEL C204 67G215B221 4H LOW E.S.R 220UF +-20% 2 CN201 33G8027 12 WAFER 2*6P 2.0MM R/A CN301 88G 35315F H D-SUB 15PIN CN503 33G801724A H PIN HEADER 24P 2.0mm...
  • Page 43 AOC 171S/171S+ C408 65G0603104 32 CHIP 0.1UF 50V X7R C409 65G0603104 32 CHIP 0.1UF 50V X7R C410 65G0603104 32 CHIP 0.1UF 50V X7R C411 65G0603104 32 CHIP 0.1UF 50V X7R C412 65G0603104 32 CHIP 0.1UF 50V X7R C413 65G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 44 AOC 171S/171S+ D321 93G 39147 TZMC5V6 D322 93G 39147 TZMC5V6 D323 93G 39147 TZMC5V6 D601 93G 6432V LL4148-GS08 FB201 71G 56Z601 CHIP BEAD 600 OHM 0805 FB301 61L0603000 RST SM 0603 JUMP MAX 0R FB302 61L0603000 RST SM 0603 JUMP MAX 0R...
  • Page 45 AOC 171S/171S+ R306 61L0603101 RST SM 0603 RC0603 100R R307 61L0603101 RST SM 0603 RC0603 100R R308 61L0603103 RST SM 0603 RC0603 10K R309 61L0603101 RST SM 0603 RC0603 100R R310 61L0603102 RST SM 0603 RC0603 1K P R311 61L0603102...
  • Page 46 AOC 171S/171S+ R620 61L0603471 CHIPR 470 OHM+-5% 1/10W R621 61L0603471 CHIPR 470 OHM+-5% 1/10W R622 61L0603471 CHIPR 470 OHM+-5% 1/10W R623 61L0603471 CHIPR 470 OHM+-5% 1/10W R624 61L0603102 RST SM 0603 RC0603 1K P R634 61L0603101 RST SM 0603 RC0603 100R...
  • Page 47 AOC 171S/171S+ C901 65L305M2222E3 2200PF+-20%400VAC BY TD C902 65L305M2222E3 2200PF+-20%400VAC BY TD C904 63G 107474 HS 0.47UF +-20% 275VAC C905 67G305S10115K 100UF +-20% 450V C906 65G 2K152 5E6921 1500 PF 10% 2KV Y5P C913 65G306M4722BP 4700PF +-20% 400VAC C922 67G215S102 3K...
  • Page 48 AOC 171S/171S+ C910 65G0805104 32 CHIP 0.1U 50V X7R C927 65G0805104 32 CHIP 0.1U 50V X7R D201 93G2004 3 SSM24PT D202 93G2004 3 SSM24PT D203 93G 39S 3 T BZT52-C11 D204 93G 39S 3 T BZT52-C11 Q201 57G 760 5A...
  • Page 49 AOC 171S/171S+ R915 61L1206103 CHIP 10KOHM 5% 1/4W R916 61L1206240 2F CHIP 24KOHM1% 1/4W R917 61L1206100 CHIPR 10 OHM+-5% 1/4W R918 61L1206103 CHIP 10KOHM 5% 1/4W R924 61L0805333 CHIP 33KOHM 1% 1/8W R925 61L0603362 CHIP 3.6K OHM 1/10W R926 61L0805242 CHIP 2.4KOHM 1% 1/8W...
  • Page 50 AOC 171S/171S+ D209 93G 64 1152T 1N4148 D210 93G 64 1152T 1N4148 D901 93G 6026T52T RECTIFIER DIODE FR107 D902 93G 6038T52T FR103 D903 93G 64 1152T 1N4148 F901 84G 56 1 FUSE 2A 250V WICKMANN FB901 71G 55 29 FERRITE BEAD...
  • Page 51 AOC 171S/171S+ R238 61G 60212352T 12KOHM 5% 1/6W R239 61G 60212352T 12KOHM 5% 1/6W R240 61G 60251352T 51KOHM +-5% 1/6W R241 61G 60251352T 51KOHM +-5% 1/6W R243 61G 17210252T 1K OHM 5% 1/4W R244 61G 17210252T 1K OHM 5% 1/4W...

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