LiteOn B17AAU Service Manual
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LiteOn B17AAU Service Manual

LiteOn B17AAU Service Manual

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Service Manual
17-inch LCD Monitor
B17AAU/B17ANU/B17AAY

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Summary of Contents for LiteOn B17AAU

  • Page 1 Service Manual 17-inch LCD Monitor B17AAU/B17ANU/B17AAY...
  • Page 2 This manual may not, in whole or in part, be copied, respective owners. photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. B17AAU / B17ANU / B17AAY Service Manual. Printed in Taiwan.
  • Page 3 B17AAU / B17ANU / B17AAY Table of Contents Circuit Description...
  • Page 4 B17AAU / B17ANU / B17AAY Circuit Description...
  • Page 5 B17AAU / B17ANU / B17AAY Circuit Description...
  • Page 6 B17AAU / B17ANU / B17AAY Circuit Description...
  • Page 7 B17AAU / B17ANU / B17AAY Circuit Description...
  • Page 8 B17AAU / B17ANU / B17AAY Circuit Description...
  • Page 9 B17AAU / B17ANU / B17AAY POWER LVCC (Audio_EN) Panel_VCC PCLK/DATA Backlight_EN Circuit Description...
  • Page 10 B17AAU / B17ANU / B17AAY POWER LVCC (Audio_EN) Panel_VCC Backlight_EN PCLK/DATA Circuit Description...
  • Page 11 B17AAU / B17ANU / B17AAY " & " & " & !" !& " " " "! "" Circuit Description...
  • Page 12 B17AAU / B17ANU / B17AAY 9 . 7 9 . 7 PWM : PWM : 9 . 7 9 . 7 9 . 7 PWM : PWM : PWM : 9 . 7 . 1 9 . 7 . 1 Start : When power is turned on, Q801 conducts due to bias from C805 and R805,R803.

  • Page 13: Table Of Contents

    B17AAU / B17ANU / B17AAY Table of Contents No display of screen (Screen is black, color of LED is amber) ----------------------------------------------------- 1 Nothing displays on screen (Screen is black, color of LED is green) ---------------------------------------------- 2 Checking the back light unit --------------------------------------------------------------------------------------------- 5...

  • Page 14: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)

    B17AAU / B17ANU / B17AAY 1. No display of screen (Screen is black, color of LED is amber) Does OSM display when you push PROCEED button. When a signal isn't being inputted, it is indicated with "VIDEO INPUT". It is indicated Preceed "No OSM display"section.

  • Page 15: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    B17AAU / B17ANU / B17AAY 2. Nothing displays on screen (Screen is black, color of LED is green) Is backlight lit? Refer "Checking the backlight unit" section Check the video cable for failure. Check the host for Does computer output RGB video signals? output signal with all black only.
  • Page 16 B17AAU / B17ANU / B17AAY Continue Check the 3.3 V power are supplied on I323, pin 2. Check if the voltage on I323 pin 3 that is high level DC at 5V. Failure point 1) Printed wire broke between P310 pin 7, 8 and and I323.
  • Page 17 B17AAU / B17ANU / B17AAY Continue Check the data enable of positive polarity are output on RN314 pin 6. Failure point 1) I315 failure. 2) Printed wire broke between I315 and RN314 pin 6. Check the data signal output on I315 R, G, B data pin.

  • Page 18: Checking The Back Light Unit

    B17AAU / B17ANU / B17AAY 3. Checking the back light unit Is +12V supplied to inverter PWB? Failure point 1) Inverter cable disconnection. 2) Power board failure. Check the BKLT_EN signal of the rectangle input P310 pin 2 at TTL high level Is a "H"...

  • Page 19: Abnormal Screen

    B17AAU / B17ANU / B17AAY 4. Abnormal screen Check the R, G, B video signal from computer input on D-Sub R, G, B connector. Failure point 1) No R, G and B video signal output from host computer. Check computer 2) Video signal cable disconnection.
  • Page 20 B17AAU / B17ANU / B17AAY Continue Check I319, I320 all LVDS signal pins. Failure point 1) I319, I320 faulure. 2) Printed wire broken between I319, I320 and P307. Process "Checking the resolution change IC movement" section. Trouble Shooting Page 7...

  • Page 21: Abnormal Auto Adjustment

    B17AAU / B17ANU / B17AAY 5. Abnormal OSM display 5.1 NO OSM display Check the input of 3.3Vp-p pulse from I315 pin P3, P4, R1, R2, P2, P1. Failure point 1) Printed wire broke between I315 pin P3 and I302 pin 5.

  • Page 22: Abnormal Plug And Play Operation

    B17AAU / B17ANU / B17AAY 6. Abnormal plug and play operation 6.1 Abnormal DDC2 Confirm the output of serial data on I312 pin 6 synchronize SCLK at TTL level. Failure point I312 failure. Failure point 1) The host machine isn't communicating in DDC2 mode.

  • Page 23: Checking The Interface Circuit Of Sync Signal

    B17AAU / B17ANU / B17AAY 7. Checking the interface circuit of sync signal 7.1 Checking the control circuit of horizontal sync pulse Check the horizontal sync signal on I315 pin L2 TTL level. Failure point 1) Video cable may have failed.

  • Page 24: Checking The Resolution Change Ic Movement

    B17AAU / B17ANU / B17AAY 8. Checking the resolution change IC movement Is there +3.3V supply on I315 pin D13, D15, D16, E17, G17, J17, L17, N17, R17, U17, U15, U13, U12, U10, U8, U6, U5, T4, L4, B2, B6, B7, B8, B9, B11, C3, D3, E3, F2, F4, G1, G3, H1, J1, J3.

  • Page 25: No Power On

    B17AAU / B17ANU / B17AAY 9. No power on Check the +5V power is supplied from power board. Failure point Power board failure. Proceed "Checking the operation of CPU". Page 12 Trouble Shooting...

  • Page 26: Checking The Dc/Dc Converter Circuit

    B17AAU / B17ANU / B17AAY 10. Checking the DC/DC converter circuit Check if the 5V is output from P310 pin 7, 8. Printed wire broke between P310 pin 7, 8 and I323 pin 3. Check the output of 3.3V line voltage from I323 pin 2.

  • Page 27: Checking The Operation Of Cpu

    B17AAU / B17ANU / B17AAY 11. Checking the operation of CPU Is there +5.0V supply on I302 pin 44 Failure point Printed wire broke between output of FB331 and I302 power supply pin. Is 24MHz clock input to I302 pin 20...

  • Page 28: Power Board

    B17AAU / B17ANU / B17AAY 12. Power Board Check output voltage +5V, +12V is right or not. It is not power board problem Check power switch is turn on or not. Turn switch on. Check power cord (P801), Signal cable (P302), P802, P803, CN102, CN103 is connected right or not.
  • Page 29 B17AAU / B17ANU / B17AAY 1. Recommended Parts List Note: 1. The components identified by “ “ mark are critical for X-ray safety. Replace these with only the same parts specified. The components identified by “ * “ mark are critical parts.
  • Page 31 LITE-ON TECHNOLOGY CORP. 5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, Taiwan Tel: 886-2-25706999 Fax: 886-2-25706888 URL:// www.liteontc.com.tw Printed in Taiwan...

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