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Acer AL1702 Service Manual

17-inch lcd monitor
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Service Manual
17-inch LCD Monitor
AL1702

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  Summary of Contents for Acer AL1702

  • Page 1 Service Manual 17-inch LCD Monitor AL1702...
  • Page 2 This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. ACER AL1702 Service Manual. Printed in Taiwan. R e vis ion O riginal release Trademarks LiteOn is a registered trademark of LiteOn Technology Corp.
  • Page 3: Table Of Contents

    No display of screen (Screen is black, color of LED is amber) -------------------------------------------------------- 11 Nothing displays on screen (Screen is black, color of LED is green) ------------------------------------------------ 12 Checking the back light unit ----------------------------------------------------------------------------------------------- 15 Abnormal screen------------------------------------------------------------------------------------------------------------- 16 AL1702 Page 1...
  • Page 4 Checking the resolution change IC movement -------------------------------------------------------------------------- 20 Checking the DC/DC converter circuit ----------------------------------------------------------------------------------- 21 10. Checking the Audio circuit [option] -------------------------------------------------------------------------------------- 22 11. Checking inverter board circuit -------------------------------------------------------------------------------------------- 23 12. Power board ------------------------------------------------------------------------------------------------------------------ 24 3) Spare Parts Recommended Spare Parts List ------------------------------------------------------------------------------------------------- 25 Page 2 AL1702...
  • Page 5: Power Board Operation Therory

    1.7.5 SCP : If output terminal is short to ground, photo transistor does not conduct, hence Q806 does not conduct either. Then oscillation of I801 is stop, shutting Q803 off immediately. Line Filter Power Board Block Diagram Rec. & Power Filter Transformer Driver AL1702 Outpur Rec. & Filter Page 3...
  • Page 6: Inverter

    R116 will be at 1.25V. Regulator ON / OFF U.V.P. Brightness control Page 4 Inverter Circuit Block Diagram Control IC : OZ960 Full-bridge switching Enable Output driver Protection Ignition Dimming Regulation control AL1702 Lamp Transformer Detection Feed back...
  • Page 7: Interface

    3.5.2 MCU (Circuit diagrams MAIN PWB 7 of 8) The I307 MCU is system processor. It can programmed scaler, control power save sequence for the system, input keypad function, output LED, control audio function, and ISP / DDC2Bi function. AL1702 Page 5...
  • Page 8 Page 6 Function Remarks Soft power switch input Power key Exit/Enter switch input Enter / withdraw from Down key ↓ switch input - / Mute key ← switch input + / Auto key → switch input AL1702...
  • Page 9: Audio

    If there is no horizontal sync signal input. If there is no vertical sync signal input. If the horizontal sync signal is outside the measuring range of MST8111B. If the vertical sync signal is outside the measuring range of MST8111B. AL1702 Page 7...
  • Page 10 37.861 31.5 37.5 31.5 37.879 48.077 46.875 49.5 57.28 48.363 56.476 60.023 78.75 67.5 63.981 79.976 Distinction Vsync 69Hz≦fV≦71Hz 59Hz≦fV≦61Hz 65.7Hz≦fV≦67.7Hz 71.8Hz≦fV≦73.8Hz 74Hz≦fV≦76Hz 55.3Hz≦fV≦57.3Hz 59.3Hz≦fV≦61.3Hz 71.2Hz≦fV≦73.2Hz 74Hz≦fV≦76Hz 73.5Hz≦fV≦75.5Hz 59Hz≦fV≦61Hz 69Hz≦fV≦71Hz 74Hz≦fV≦76Hz 74Hz≦fV≦76Hz 59Hz≦fV≦61Hz 59Hz≦fV≦61Hz 74Hz≦fV≦76Hz AL1702 Polarity The fixed mode...
  • Page 11: Power On Sequence

    Power Switch LED_G (LED) PANELVCC_EN (Panel VCC) PCLK/DATA (LVDS bus) BKLT_EN (Backlight Power) AUDIO_EN (Audio VCC) 157 ms 1.8 sec 1.84 sec 2 sec 2 sec 90 ms 350 ms 316ms 90 ms 1.55 sec AL1702 Page 9...
  • Page 12: List Of I/O Pin Assignments Of The I307

    UART interface data OUT Interrupt signal from the scaler EEPROM data bus EEPROM clock bus DDC EEPROM write protection VGA cable connected Panel power enable Back light power enable Audio power enable Audio mute enable Backlight brightness control Audio volume control AL1702...
  • Page 13: No Display Of Screen (Screen Is Black, Color Of Led Is Amber)

    Check if the sync signal from computer is output and if the video cable is connected normally. Proceed "checking the resolution change IC movement" section. AL1702 Proceed "No OSM display" section. Input the sync signal of computer, or change the cable. Page 11...
  • Page 14: Nothing Displays On Screen (Screen Is Black, Color Of Led Is Green)

    1)Change pattern of video signal output on the host. 2)Rsconnect the video cable. 3)Change the video cable. Check if the LCD video signal cable is connected between the MAIN PWB and LCD module. Next Page AL1702 Failure Point The cable is disconnected.
  • Page 15 I302 is failure Check if the voltage on I302 pin3 that is power DC at 5V. Failure Point 1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board. Failure Point I302 is failure AL1702 Page 13...
  • Page 16 Q303 pin2 at TTL high Failure Point 1) Printed wire broke between Q303 pin 2 and I307 pin9. 2) I307 is failure. AL1702 level. Failure Point 1) Prined wire broke between Q303 pin 3, R309, R308 and I312 pin1.
  • Page 17: Checking The Back Light Unit

    Failure Point 1) printed wire broke between P301 pin6, R306 and I307pin 31. 2) I307 is failure. signal. Failure Point 1) printed wire broke between P301 pin5, Q301, Q302 and I305 pin73. 2) I305 is failure. AL1702 Page 15...
  • Page 18: Abnormal Screen

    1)Printed wire broke between P302 pin 9 and I305 pin63. 2) Video cable is failure. 3) R322 is short or open. 4) R318 is short or open. 5) C332 is short or open. Failure Point Printed wire broke between I305 and P305. AL1702...
  • Page 19: Abnormal Osm Display Adjust Problem

    2) Printed wire broke between P308 pin4 and I307 pin2. 3) Printed wire broke between P308 pin5 and I307 pin1. 4) Printed wire broke between P308 pin6 and I307 pin42. 5) C404, C405, C406, C407 is short. 6) R367, R368, R369, R370 is short or open. AL1702 Page 17...
  • Page 20: Abnormal Plug And Play Operation

    TheVideo cable is failure. Failure Point 1) Printed wire broke between I304 pin8, D309, D310 and P302 pin13. 2) D309 or D310 is failure. 3) D315 is failure. Failure Point TheVideo cable is failure. Failure Point I304 is failure. AL1702...
  • Page 21: Checking The Interface Circuit Of Sync Signal

    1) Printed wire broke between P302 pin3 and I305 pin37. 2) FB313, R329 open. 3) R331, C346 short. Failure Point Video cable is failure. Failure Point 1) Printed wire broke between P302 pin3 and I305 pin36. 2) FB312, R328 open. 3) R330, C345 short. AL1702 Page 19...
  • Page 22: Checking The Resolution Change Ic Movement

    3) X301 failure. Failure Point 1) Printed wire broke between I305 pin32 and I307 pin23. 2) R410, R380 open. 3) I307 failure. Failure Point 1) Printed wire broke between I305 pin69, 70, 71 and I307 pin20, 21, 2) I307 failure. AL1702...
  • Page 23: Checking The Dc/Dc Converter Circuit

    1) Printed wire broke between P301 pin1. 2 and I302 pin3. 2) FB301, FB302 open. Failure Point I302 is failure. Failure Point 1) Printed wire broke between P301 pin1. 2 and I301 pin3. 2) FB301, FB302, FB305 open. Failure Point I301 is failure. AL1702 Page 21...
  • Page 24: Checking The Audio Circuit [Option]

    Failure Point 1) Prined wire broke between I307 pin33 and I311 pin12. 2) C414 short. 3) I307 failure. Failure Point 1) Speaker failure. 2) Prined wire broke between I311 pin14, 17 and P310. 3) C415, C418 open or short. AL1702...
  • Page 25: Checking Inverter Board Circuit

    It is not inverter problem. Check Q106, Q102 and repair them. right. Check CCFL and repair them. Check R128 and repair it. pulse. Check C115, R108, I101 and repair them. Repair I101. Check C128/C129/C132/D115/ D114/C118 and repair them. Repair them. AL1702 Page 23...
  • Page 26: Power Board

    Check R805, R803, I801 and repair pulse or not. Check peripheral co,of I801 and repair them. pulse or not. Check Q803, R813, R814, D806, R812 and repair them. Check D804, R807 and repair them. is over load. Repair them. repair them. AL1702 them. them.
  • Page 27: Recommended Parts List

    IC M24C26 SOP-8 ST 6444014708 FET P-Channel AO3401 SOT-23 AOS 6448015578 IC MTV312MV64-AJ PLCC44 Myson 6449006400 Crystal 14.318MHz AT-49 TOPICS 6449004820 Crystal 11.0592MHz AT-49 TOPICS 6442023100 IC Amplifier TDA7496L PDIP20 ST 6111456131 Coil Choke 45uH DRWW 10x10 AL1702 Description Page 25...
  • Page 28 21-5 21-9 21-2 21-1 21-11 21-13 REVISIONS AUTH ZONE DESCRIPTION Carol RELEASE FOR PRELIMINARY ITEM SUB-ITEM PART NO. DESCRIPTION 7737510250-0A F/C ASS'Y 7742226850-0A FRONT COVER 7742806820-0A PUSH BUTTON 7742302330-0A LENS 5113800138 PUSH BUTTON BD 7140130081 SCREW M3x8L(BUTTON-BD) 6814701400 QDI PANEL 7746501720-0A BARRIER BOTTOM 7737807400-0A...
  • Page 30 ACER AL1502 / AL1702 SCHEMATIC REV 02 PTB-1468 27 April 2004 ROAD MAP DESCRIPTION TITLE SHEET POWER VGA & DDC INTERFACE SCALER MST8111/6B PANEL INTERFACE AUDIO REVISION HISTORY REV. DESCRIPTION BASED ON SCHEMATICS FOR ACER SHEET NO. LAST UPDATE KT.LIN 27 April '04 LITE-ON TECHNOLOGY CO.
  • Page 31 GNDR GNDG VCC5V GNDB VCC5V HSYNC VSYNC DDC5V DDC5V DDC_WP DDC_WP DDC_DAT DDC_DAT DDC_CLK DDC_CLK VGA_DET VGA_DET 3.VGA & DDC INTERFACE VGA_DET VGA_DET DDC_CLK DDC_CLK DDC_DAT DDC_DAT DDC_WP VCC5V DDC_WP DDC5V DDC5V HWRESET VCC5V MUTE MUTE AUDIO_EN AUDIO_EN PANELVCC_EN PANELVCC_EN BKLT_EN BKLT_EN PANEL12V_EN...
  • Page 32 VCC5V P301 VCC5V FB301 PBY201209T-121Y-S VCC5V FB302 PBY201209T-121Y-S VDD15V JWT-A2001WV2-10 VDD15V VDD15V C311 C310 C301 0.1uF 0.1uF 47uF/25V DGND 3,4,5,6,7 VCC3V3 VCC5V NOTE: FOR PANEL POWER SELECTION. IF 3.3V INSTALL FB303 FB303 IF 5V INSTALL FB304 PBY201209T-121Y-S(NC) R308 R309 R311 Q303 C325 PANELVCC_EN...
  • Page 33 D301 P302 MMBD7000 VGA_CON VCC5V PC5V C331 SCL_VGA 0.1uF SDA_VGA RED+ RED- GREEN+ GREEN- BLUE+ BLUE- HSYNC_IN VSYNC_IN JWT-A2001WV2-14 MMBD7000 VCC5V FB313 BK2125HS431 FB312 BK2125HS431 SCL_VGA SDA_VGA D311 D312 D313 MMSZ5232B 1N4148(NC) MMSZ5232B R317 VGA_DET 6 FB309 R322 C336 75_1% 10pF(NC) FB310 R323...
  • Page 34 NOTE: IF IS 15" (XGA) PANEL, I305 IS SELECT MST8011B. NOTE: IF IS 17" (SXGA) PANEL, I305 IS SELECT MST8111B. VPLL RIN0 GNDR GNDR RIN0M GIN0 GNDG GNDG GIN0M SOGIN0 BIN0 GNDB GNDB BIN0M HSYNC HSYNC HSYNC0 VSYNC VSYNC VSYNC0 DDC1_CLK/GPO8 DDC1_DAT/GPO7 R340...
  • Page 35 PA[0..7] PA[0..7] PA[0..7] PA[0..7] RA1P RA1N RA2P RA2N RA3P RA3N PA12 PA13 PA[8..13] PA[8..13] GA1P GA1N PA10 GA2P PA11 GA2N PA12 GA3P PA13 GA3N PA[14..19] PB[12..23] PA[14..19] PB[12..23] PB12 PB13 PA14 BA1P PA15 BA1N PB14 PA16 BA2P PB15 PB16 PA17 BA2N PA18 BA3P...
  • Page 36 VCC5V C396 VCC5V 10uF/16V C398 R383 R381 0.1uF D316 R379 I308 1N4148 R382 R384 DDC_WP 24C16 VGA_DET PANEL12V_EN PANELVCC_EN IVCOM BKLT_EN AUDIO_EN MUTE R389 VCC5V P308 JWT-A2001WV2-09 C401 C402 0.1uF 0.1uF VCC5V C393 R365 R366 R367 C394 0.1uF 10uF/16V C395 22pF I307 P5.0 P5.1...
  • Page 37 VDD15V FB320 AUDIO_15V VDD15V PBY201209T-300Y-S FB321 2,3,4,5,6 DGND PBY201209T-300Y-S AUDIO_EN P309 AUDIO_IN_R R417 AUDIO_IN_L R418 JWT-A2001WV2-03 AUDIO IN PBY201209T-300Y-S ANA-GND VOLUME I310 CEM9435A AUDIO_15V C409 R411 C410 0.1uF 100uF/25V R412 ANA-GND R413 R415 Q311 MMBT3904 ANA-GND ANA-GND IN_R C416 1.0uF/50V IN_L C417 1.0uF/50V...
  • Page 38 Printed in Taiwan...