LiteOn U170ATA Service Manual
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LiteOn U170ATA Service Manual

LiteOn U170ATA Service Manual

17-inch
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17-inch LCD Monitor
U170ATA

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Summary of Contents for LiteOn U170ATA

  • Page 1 Service Manual 17-inch LCD Monitor U170ATA...
  • Page 2 U170ATA Table of Contents Audio circuit --------------------------------------------------------------------------------------------------------------- 1 1.1 Audio input ------------------------------------------------------------------------------------------------------------ 1 1.2 Audio output ---------------------------------------------------------------------------------------------------------- 1 Power supply -------------------------------------------------------------------------------------------------------------- 1 Video input circuit -------------------------------------------------------------------------------------------------------- 1 Definition converter LSI peripheral circuit ---------------------------------------------------------------------------- 1 System reset, LED control circuit --------------------------------------------------------------------------------------- 1...
  • Page 3 U170ATA Circuit Description...
  • Page 4 U170ATA Circuit Description...
  • Page 5 U170ATA Circuit Description...
  • Page 6 U170ATA Circuit Description...
  • Page 7 U170ATA Circuit Description...
  • Page 8 U170ATA POWER LVCC (Audio_EN) Panel_VCC PCLK/DATA Backlight_EN Circuit Description...
  • Page 9 U170ATA POWER LVCC (Audio_EN) Panel_VCC Backlight_EN PCLK/DATA Circuit Description...

  • Page 10: Circuit Description

    U170ATA Circuit Description...

  • Page 11: Table Of Contents

    U170ATA 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 Abnormal screen ---------------------------------------------------------------------------------------------------------- 6 Abnormal Auto adjustment ---------------------------------------------------------------------------------------------- 8 5.1 NO OSM display ----------------------------------------------------------------------------------------------------- 8...

  • Page 12: Trouble Shooting

    U170ATA 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 13: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    U170ATA 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 14 U170ATA Continue Check the 3.3 V power are supplied on I323, I330 pin 2. Check if the voltage on I323, I330 pin 3 that is high level DC at 5V. Failure point 1) Printed wire broke between I322 and I323, I330 2) I322 failure.
  • Page 15 U170ATA 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 16: Checking The Back Light Unit

    U170ATA 3. Checking the back light unit Is +19V supplied to F301 pin 1. Are connected AC adapters normal goods? Failure point An AC adapter is changed to the normal goods. Is +19V supplied to P308 pin 3, 4 to inverter...

  • Page 17: Abnormal Screen

    U170ATA 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 18 U170ATA Continue Check I319, I320 all LVDS signal pins. Failure point 1) I319, I320 faulure. 2) Printed wire broken between I319, I320 and P307. Check SDRAM IC clk signal output to I318, I316, I317, pin 35 from I315 pin T3.

  • Page 19: Abnormal Auto Adjustment

    U170ATA 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. 2) Printed wire broke between I315 pin P4 and I302 pin 4.

  • Page 20: Abnormal Plug And Play Operation

    U170ATA 6. Abnormal plug and play operation 6.1 Abnormal DDC2 Confirm the output of serial data on I312 pin 6, I310 pin 6 synchronize SCLK at TTL level. Failure point I310, I312 failure. Failure point 1) The host machine isn't communicating in DDC2 mode.

  • Page 21: Checking The Interface Circuit Of Sync Signal

    U170ATA 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. 2) Printed wire broke between P304 pin 13...

  • Page 22: Checking The Resolution Change Ic Movement

    U170ATA 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 23: No Power On

    U170ATA 9. No power on Check the +19V power is supplied from AC adapter. Failure point AC adapter failure. Is LED turned on in amber momentarily when a power button is pushed? Failure point Fuse failure. Proceed "Checking the operation of CPU".

  • Page 24: Checking The Dc/Dc Converter Circuit

    U170ATA 10. Checking the DC/DC converter circuit Check if the 5V is output from I322 pin 2. Printed wire broke between I322 pin 1 and L314 pin 2. Check the output of 3.3V line voltage from I323 pin 2. Is the output FB335 being inputted...

  • Page 25: Checking The Operation Of Cpu

    U170ATA 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 and 21 at TTL level? Failure point X301 failure.

  • Page 26: Checking The Audio Circuit

    U170ATA 12. Checking the audio circuit Is a cable with the host PC connected? Failure point Audio cable disconntction. Aren't the setups of the host PC a minimum and off? Failure point The setup of the host PC is changed.
  • Page 27 U170ATA Is the output waveform which is the Is the "H" signal of the TTL level same as I006 pin 9, 22 being being inputted to I008 pin 1? inputted to I007 pin 1,9? Failure point Is the "H" signal of the TTL level being outputted from I306 pin 17? 1) Printed wire broke between I006 pin 9, 22 and I007 pin 1, 9.

  • Page 28: Recommended Parts List

    U170ATA 1. Recommended Parts List Location Part Number Description Recommended Spare Parts List...
  • Page 29 U170ATA Location Part Number Description Recommended Spare Parts List...
  • Page 30 LITEON U170ATA / U170BTA For LiteON SCHEMATIC REV 01 PTB-1195 9th. OCT. 2001 CONTENTS DESCRIPTION SHEET NO. TITLE SHEET TOP LEVEL MICROCONTROLLER INPUT INTERFACE VIDEO DECODER ASIC INTERFACE FRAME STORE LVDS INTERAFCE POWER I POWER II REVISION HISTORY REV. DESCRIPTION...
  • Page 31 Sheet 4 Sheet 6 Sheet 8 RED+ DCLK RED+ RED+ DCLK DCLK RED- RED- RED- GREEN+ GREEN+ GREEN+ GREEN- GREEN- GREEN- BLUE+ BLUE+ BLUE+ BLUE- DARED[0..7] BLUE- BLUE- DARED[0..7] DARED[0..7] DAGRN[0..7] DAGRN[0..7] DAGRN[0..7] DABLU[0..7] DABLU[0..7] DABLU[0..7] RXC+ RXC+ RXC+ RXC- DBRED[0..7] RXC- RXC-...
  • Page 32 VCCF -RESET -RESET 47uF/16V C301 RN301 RN302 H D ATAF[0..3] HDATAF0 R303 HDATAF1 0.1uF HCLK C302 HDATAF2 I301 HDATAF3 R304 C585 R305 C303 0.1uF 100pF I326A RN303 HCLK-SCL HFS-SDA R306 C304 100pF -IRQ 74HCT04 C305 M51953A 27nF I302 A[8..15] P301 HDATA0 P1.0/T2 A8/P2.0...
  • Page 33 D301 D303 D304 D305 D306 D307 D308 D309 For U170BTA Only. DAN217 C331 DAN217 C332 DAN217 C333 DAN217 DAN217 C335 DAN217 C336 DAN217 DAN217 C334 C337 C338 RX2-IN RX2+IN RX1-IN RX1+IN RX0-IN RX0+IN RXC+IN RXC-IN 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...
  • Page 34 CVDD33 6,10 L323 L324 STS222B STS222B VDD3 +5V_DEC 3,4,8..10 CVDD33 C376 C377 C378 C379 C380 C381 C382 C383 C384 C385 C386 C387 C388 22uF 22uF 0.1uF 0.1uF 0.1uF 0.1uF 220pF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 220pF L329 DEC_GND STS222B DEC_GND FB312 C389 C390...
  • Page 35 AVDD_2.5 DCLK AVDD_2.5 AVDD_2.5 AVDD_2.5 AVDD_2.5 DARED0 AVDD_2.5 DARED1 g m 5 020 DARED2 AVDD_3.3 DARED3 AVDD_3.3 DARED4 AVDD_3.3 DARED5 AVDD_3.3 DARED6 AVDD_3.3 DARED7 AVDD_3.3 DAGRN0 AVDD_3.3 DAGRN1 AVDD_3.3 DAGRN2 AVDD_3.3 DAGRN3 DAGRN4 AGND DAGRN5 AGND DAGRN6 AGND DAGRN7 AGND DABLU0 AGND DABLU1...
  • Page 36 Configuration Pin FSDATA[0..47] VR33 FSADDR[0..13] VR33 I316 FSADDR0 FSDATA0 VR33 FSADDR1 FSDATA1 FSADDR2 FSDATA2 FSADDR3 FSDATA3 FSADDR4 FSDATA4 C482 C483 C484 C485 C486 C487 C488 FSADDR5 FSDATA5 FSADDR6 FSDATA6 22uF 0.1uF 0.1uF 0.1uF 220pF 220pF 220pF FSADDR7 FSDATA7 FSADDR8 FSDATA8 FSADDR9 FSDATA9 FSADDR10...
  • Page 37 L321 L322 FB316 HB-1B2012-601T03 HB-1B2012-601T03 C504 C505 C506 C507 WB160808B121QNT DCLK PCLK 0.1uF 0.1uF 0.1uF 0.1uF C583 C590 47pF 10pF I319 RN314 A PIXELS DS90CF383MTD LVDS_EN TXIN27 PWRDWN LVDS_ON LVDS_EN TXIN5 TX0-O TXIN0 TXOUT0- 47X4 TX0+O TXIN1 TXOUT0+ TX1-O RN315 RN316 TXIN2 TXOUT1-...
  • Page 38 R371 4K7 R372 100 Q308 R373 SST3904 P308 R374 R375 SST3906 Q309 R376 100 R377 C529 0.93A INVERTER PWM1 10uF/16V R378 FB326 HEADER 6 FB327 C533 C534 2.0 mm pitch PGND PGND 680uF/25V 0.1uF PGND C530 C531 C532 10uF/16V 0.1uF 0.1uF PVCC1 I327A...
  • Page 39 CVDD33 5,6 D344 CVDD33 RLS-71 CVDD33 3..5,8,9 I323 33 8 L325 FB335 TO-263 RC1587M33 HH-1M3216-121JT STS222B 0.072A C563 C564 C568 C567 C565 0.1uF 220uF/10V 0.1uF C566 220uF/10V 10uF/16V 0.1uF FB334 DVDD33 6 WB201209B300QST 0.085A DVDD33 C562 C561 0.1uF 47uF/16V AVDD33 6 L326 L327 PVDD33...
  • Page 40 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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