Service Manual 17-inch LCD Monitor AL1702
Service Manual Versions and Revision N o. Ve rs ion R e le as e D ate R e vis ion 1. 1.0 May 12, 2004 O riginal release Copyright Trademarks Copyright 2004 LiteOn Technology Corp. LiteOn is a registered trademark of LiteOn Technology Corp. All Rights Reserved 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.
AL1702 1) Circuit Description 1. Power Board Operation Therory -------------------------------------------------------------------------------------------- 3 2. Inverter -------------------------------------------------------------------------------------------------------------------------- 4 3. Interface ------------------------------------------------------------------------------------------------------------------------- 5 3.
AL1702 6. Abnormal plug and play operation --------------------------------------------------------------------------------------- 18 7. Checking the interface circuit of sync signal ---------------------------------------------------------------------------- 19 7.1 Checking the control circuit of horizontal sync pulse ------------------------------------------------------------- 19 7.
AL1702 1) Circuit Description 1. Power Board Operation 1.1 Line filter consists of C801, T801, C802, C803, C804. It eliminates high frequency interference to meet EMI’s requirement. 1.2 Rec & Filter Bridge diode D801 converts AC source into pulsed DC. This pulsed DC is smoothed and filtered by C805. R802 is an NTC ( negative thermal coefficient ) resistor, used to reduce inrush current to be within safe range. 1.
AL1702 2. Inverter Operation This unit operates on an output voltage of 22V from power source. 2.1 VCC: When On/Off pin of P802 is high level input, Q106 turns on and provides +5VDC for I101 power supply. 2.2 Control IC: I101 (OZ960S) 2.2.1 Enable : When pin 3 of I101 is over 1.5V, I101 works. If it is under 1.5V, I101 turns off. 2.2.2 OSC: When I101 enabled, R108/C115 (pin 17/pin18 of I101) determine the operating frequency. 2.2.3 SST: C104 (pin 4 of I101) provides soft start function. 2.2.
AL1702 3. Interface Operation 3.1 Top (Circuit diagrams MAIN PWB 2 of 8) This page is function block. (1) power. (2) VGA & DDC interface. (3) scaler MST8111B. (4) panel interface. (5) audio (option). 3.2 Power (Circuit diagrams MAIN PWB 3 of 8) 3.2.1 P301 connector A 5V power supply for LCD module, MCU, logic. And a 12V power supply for audio function. It is generated from the P301 connector. 3.2.2 I301 : 3-terminal regulator A 2.
AL1702 3.5.3 X302 crystal The X302 crystal is 11.0592MHz, support the operated clock to the MCU. 3.5.4 Reset circuit The C396, R379, D316 is support reset signal to the MCU, then MCU have output hardware reset signal (HWRESET) to the scaler. 3.5.5 I308EEPROM The I308 is 24LC16 EEPROM, the data transfer between I308 and MCU is effected through the IIC bus SCL (pin14) and SDA (pin13) of MCU. The OSD related setting data, I305 control data and other service data, to be stored in I308. 3.5.
AL1702 3.6 Audio (Circuit diagrams MAIN PWB 8 of 8) [OPTION] 3.6.1 P309 connector The audio signal input received from the audio input terminal P309 from the jack input of the jack board, P309 is applied to amplifier I311 of pin4 (L-CH) and pin9 (R-CH) through the low-pass filter consisting of R417, R418, C419 and C420. 3.6.2 P310 connector The audio signal is output to the audio output terminal P310, and to the internal speaker system. 3.6.
AL1702 Table 2 video mode Mode 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Resolution 720x400 (70Hz) 640x480 (59.94Hz) 640x480 (66.67Hz) 640x480 (72Hz) 640x480 (75Hz) 800x600 (56.25Hz) 800x600 (60Hz) 800x600 (72Hz) 800x600 (75Hz) 832x624 (74.55Hz) 1024x768 (60Hz) 1024x768 (70Hz) 1024x768 (75Hz) 1152x864 (75Hz) 1280x960 (60Hz) 1280x1024 (60Hz) 1280x1024 (75Hz) H-Freq (KHz) 31.469 31.469 35 37.861 37.5 35.156 37.879 48.077 46.875 49.722 48.363 56.476 60.023 67.5 60 63.981 79.976 Band Width (MHz) 28.322 25.
AL1702 4.3 Power ON sequence When the POWER switch is pressed, the POWER OFF signal is turned “H”. when this “H” potential is detected, the CPU begins to establish the respective power supplies according to the sequence show below. Power Switch 157 ms LED_G (LED) 1.8 sec PANELVCC_EN (Panel VCC) 1.84 sec PCLK/DATA (LVDS bus) 2 sec BKLT_EN (Backlight Power) 2 sec AUDIO_EN (Audio VCC) 4.
AL1702 4.5 List of I/O Pin Assignments of the I307 Pin No. Initial Function Setting 3 P5.0 KEY_POWER H ON/OFF monitor power 2 P5.1 KEY_MENU H OSD enter/exit enable 1 P5.2 KEY_PLUS H OSD right enable 42 P5.3 KEY_MINUS H OSD left enable 41 P5.4 KEY_DOWN H OSD down enable 38 P1.0 LED_G H LED green enable 37 P1.1 LED_A H LED amber enable 20 P1.2 SCL H Clock of 3-wire bus for scaler 21 P1.3 SDA H Data of 3-wire bus for scaler 22 P1.4 CSZ H Chip select of 3-wire bus for scaler 25 P1.
AL1702 1. No display of screen (Screen is black, color of LED is amber) Does OSM display when you push PROCEED buttom. When a sugnal isn't being inputed, it is indicated with "VIDEO INPUT". it is indicated with "OUT OIF RANGE" at the time of the frequency that it can't be distinguished. No Proceed "No OSM display" section. Yes Check if the sync signal from computer is output and if the video cable is connected normally. NG Input the sync signal of computer, or change the cable.
AL1702 2. Nothing displays on screen (Screen is black, color of LED is green) Is backlight lit? NG Refer "Checking the backlight unit" section" OK Does computer output RGB video signals? Check the video cable for failure. Check the host for output signal with all black only. NG OK 1)Change pattern of video signal output on the host. 2)Rsconnect the video cable. 3)Change the video cable. Check OSM menu is display on screen when you push the "PROCEED" key.
AL1702 Continue Check the 3.3V power are supplied on I302, pin2, 4. NG Check if the voltage on I302 pin3 that is power DC at 5V. Failure Point NG OK OK 1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board. Failure Point I302 is failure Check the 2.5V power are supplied on I302, pin2, 4. NG Check if the voltage on I302 pin3 that is power DC at 5V. Failure Point NG OK OK 1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board.
AL1702 Continue Check the 5V power are supplied on P305 pin 1, 2, 3 (to the LCD panel) NG Check if theVoltage on I312 pin2 that is DC power at 5V. Failure Point NG OK 1) FB314 is open. 2) Printed wire broke between P305 pin1, 2, 3, FB304, and P301 pin1, 2. Check if the TTL level on I312 pin,1 that TTL level is low. OK NG OK Check the PANELVCC_EN signal of the rectangle input Q303 pin2 at TTL high level. Failure Point I312 is failure.
AL1702 3. Checking the back light unit Is +12V supplied to inverter PWB ? (by the power board) Failure Point NG OK 1) Inverter cable disconnection. 2) Power board failure. Check the BKLT_EN signal of the rectangle input P301 pin 6 at TTL high level. Failure Point NG OK 1) printed wire broke between P301 pin6, R306 and I307pin 31. 2) I307 is failure. Check the BKLT_ADJ signal of the input P301 pin5 from I305 pin73 is a PWM signal.
AL1702 4. Abnormal screen Check the R, G, B video signal from computer input on P302 of video connector. NG OK Failure Point 1) No R, G, B video signals output from host computer, check computer. 2) Video signal cable disconnection. Check the R, G, B input video signals on I305 pin63, 60, 58 respectively that their level is 0.5 to 0.7Vp-p. NG OK Check all LVDS signals being output to P305 from I305? NG OK Prpcess "Checking the resolution change IC movement" section.
AL1702 5. Abnormal OSM display adjust problem Check the input TTL level whether was changed when pressed function keys on the P308 pin3, 4, 5, 6. (normal is high level, when push buttom, generated low level plus) NG Failure Point OK 1) Function key wire disconnection. 2) Function key wire is failure. 3) Function key board is failure. Check the input TTL level whether was changed when pressed function keys on the I307 pin1, 2, 41, 42.
AL1702 6. Abnormal plug and play operation Confirm the host computersupplies DDC2 mode. NG OK Failure Point The host machine is not communicatiog in DDC2 mode. Check the voltage on P302 pin13 that is power DC 5 V. NG OK Failure Point TheVideo cable is failure. Check the voltage on I304 pin8 that is power DC 5 V. NG Failure Point 1) Printed wire broke between I304 pin8, D309, D310 and P302 pin13. 2) D309 or D310 is failure. 3) D315 is failure.
AL1702 7. Checking the interface circuit of sync signal 7.1 Checking the control circuit of horizontal sync pluse Check the horizontal sync signal on P302 pin3 TTL level. Failure Point NG Video cable is failure. OK Check the horizontal sync signal on I305 pin37 TTL level. NG OK Failure Point 1) Printed wire broke between P302 pin3 and I305 pin37. 2) FB313, R329 open. 3) R331, C346 short. Failure Point Process "Checking the resolution change IC movement" section. 7.
AL1702 8. Checking the resolution change IC movement Check +3.3V supply on I305 pin11, 21, 84, 94, 104, 114, 126, 55, 65, 35, 45, 51, 53. NG Proceed " Checking the DC/DC converter circuit" section. OK Check +2.5V supply on I305 pin18, 87, 97, 117. NG Proceed " Checking the DC/DC converter circuit" section. OK Check X301 14.318MHz clock input to I305 pin33 and 34 at TTL level. Failure Point NG OK 1) Printed wire broke between X301 and I305 pin33, 34. 2) C371, C375 short or open. 3) X301 failure.
AL1702 9. Checking the DC/DC converter circuit Check the 5V is output from P301 pin1, 2 NG OK Failure Point 1) Power wire disconnection. 2) Power board is failure. Check the 5V is input to I302 pin3. NG Failure Point OK 1) Printed wire broke between P301 pin1. 2 and I302 pin3. 2) FB301, FB302 open. Check the 3.3V is output from I302 pin2, 4. Failure Point NG I302 is failure. OK Check the 5V is input to I301 pin3. NG Failure Point OK 1) Printed wire broke between P301 pin1. 2 and I301 pin3.
AL1702 10. Checking the Audio circuit [OPTION] Check the Audio signal input to P309 NG OK Failure Point 1) Audio wire disconnection. 2) Audio Jack board failure. Check the 12V is input to I310 pin5, 6, 7, 8. Failure Point NG OK 1) Printed wire broke between P301 pin7. 8 and I310 pin1, 2, 3. 2) FB320 open. 3) Printed wire broke between I307 pin32 and I310 pin4. 4) Q311 failure. 5) I310 failure. Check the 12V is input to I311 pin15, 16.
AL1702 11. Checking inverter board circuit Check C101 pin is around . On/off pin of P802 is over 2V. Brightness pin is between 0V and 3.5V. OK NG It is not inverter problem. Check pin 5 of I101 is 5V. OK NG Check Q106, Q102 and repair them. Check CN102, CN103 is connected right. NG OK Check CCFL and repair them. Check pin 3 of I101 is over 2V. OK NG Check R128 and repair it. Check pin 18 of I101 is triangle pulse. OK NG Check C115, R108, I101 and repair them.
AL1702 12. Power Board Check output voltage +5V, +12V and 22V is right or not. No Yes It is not power board problem. Check power switch is turn on or not. Yes No Turn switch on. Check power cord (P801), signal cable (P302), P802, P803, CN102, CN103 is connected right or not. No Yes Connect it right Check C805 is about DC140V-330V or not. Yes No Check F801, D801, P801 and repair them. Check C807 is over 10V or not. Yes No Check R805, R803, I801 and repair them.
AL1702 3. Recommended Parts List Note: 1. If you have spare parts need, please check BOM to get the last release part number and related information. No.
2 3 4 5 6 7 8 9 10 11 12 13 14 15 REVISIONS 1 AUTH 1-1 A ZONE LTR Carol ECN DESCRIPTION A DATE APPROVED RELEASE FOR PRELIMINARY A 4 9 5 8 6-2 6-1 13 B B 26 C C 10 1-3 6-3 22 15 1-2 12 3 D 2 D 11 25 16 14 17 7 19 18 20 E E ITEM 1 SUB-ITEM 1-1 1-2 1-3 2 3 4 5 6 F 6-1 6-2 6-3 23 21-5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24 21-9 G 21-4 21-6 21-2 H 21-8 21-1 21-2 21-3 21-4 21-5 21-6 21-7 21-8 21-9 21-10 21-11 21-12 21-13 21-7 21-3 21-1 I 2
5 4 3 2 1 ACER AL1502 / AL1702 D D SCHEMATIC REV 02 PTB-1468 27 April 2004 ROAD MAP DESCRIPTION C SHEET NO. TITLE SHEET TOP 1 2 POWER 3 VGA & DDC INTERFACE 4 SCALER MST8111/6B 5 PANEL INTERFACE 6 AUDIO 7 C REVISION HISTORY REV. DESCRIPTION BASED ON SCHEMATICS FOR ACER 02 BY LAST UPDATE KT.LIN 27 April '04 B B A A Sheet: LITE-ON TECHNOLOGY CO. 1 DRAWN: Date: DESIGN: Date: Title: CHECK: Date: CHECK: Date: DWG.NO: APPRO: Date: APPRO: Date: PCB.
5 4 3 2 1 D D B1 B2 RIN GNDR GIN GNDG SOG BIN GNDB HSYNC VSYNC VCC5V VCC5V DDC5V DDC_WP RIN GNDR GIN GNDG SOG BIN GNDB HSYNC VSYNC RIN GNDR GIN GNDG SOG BIN GNDB HSYNC VSYNC VCC2V5 VCC3V3 DDC5V DDC_WP VCC2V5 VCC3V3 DDC_DAT DDC_CLK DDC_DAT DDC_CLK VGA_DET VGA_DET 3.
5 4 3 2 1 VCC5V TO-252 R301 VCC5V R302 I301 3 C P301 VCC5V PBY201209T-121Y-S PBY201209T-121Y-S VCC5V 3,6,7 4K7 3 FB301 FB302 1 2 3 4 5 6 7 8 9 10 B Q301 MMBT3904 VDD15V R305 0.1uF 2K2 1 C304 47uF/25V 1 Q302 MMBT3906 C306 R303 VOUT 2 ADJ TAB 4 VCC2V5 C303 C305 47uF/25V 0.1uF(NC) 4 0.1uF(NC) D R304 2 3 VDD15V C302 VIN AIC1117-25CE VDD15V JWT-A2001WV2-10 E 2 1 D VCC2V5 100 VCC5V BKLT_ADJ 10K C307 C308 10nF 0.1uF 4 10K 7 C311 C310 C301 0.1uF 0.
5 4 3 2 1 R317 VGA_DET 6 3 100 P302 VCC5V 2 VGA_CON PC5V SCL_VGA SDA_VGA 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 D FB309 D301 MMBD7000 R322 C336 75_1% 10pF(NC) SBK160808T-300Y-S C331 0.
5 4 3 2 1 NOTE: IF IS 15" (XGA) PANEL, I305 IS SELECT MST8011B. NOTE: IF IS 17" (SXGA) PANEL, I305 IS SELECT MST8111B. VAD VPLLVDVI VDPLL VPO VDD VCC3V3 VPO 18 87 97 117 11 21 84 94 104 114 126 53 45 51 35 55 65 FB314 2 I305 MST8011B/8111B VCC3V3 PBY160808T-600Y-S C351 C353 C354 C355 C356 C357 C358 C359 10uF/16V 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF VCC2V5 VDD C360 C361 C362 C363 C364 10uF/16V 0.1uF 0.1uF 0.1uF 0.
5 4 PA[0..7] 4 PA[0..7] 4 4 PA[0..7] PA[0..7] PA2 PA3 PA4 PA5 PA6 PA7 D 3 4 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA12 PA13 RA1P RA1N RA2P RA2N RA3P RA3N LVACKP LVACKM LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M LVA3P LVA3M 4 PA8 PA9 PA10 PA11 PA12 PA13 GA1P GA1N GA2P GA2N GA3P GA3N PB0 PB1 PB2 PB3 PB4 PB5 RB1P RB1N RB2P RB2N RB3P RB3N PB6 PB7 PB8 PB9 PB10 PB11 GB1P GB1N GB2P GB2N GB3P GB3N P303 RA3N RA3P PB[6..11] PB[6..11] PB[12..23] 4 PB[12..23] 4 PA[14..
5 4 3 2 1 VCC5V C394 D C393 R365 R366 R367 R368 R369 R370 R371 0.1uF 4K7 4K7 4K7 4K7 4K7 4K7 4K7 10uF/16V VCC5V D 12 C398 R383 R381 11 C397 22pF 0.1uF 4K7 4K7 I308 1 2 3 4 A0 A1 A2 GND VCC WP SCL SDA 7 D316 R379 1N4148 10K 4 8 7 6 5 R382 R384 19 INT 100 100 C 14 13 27 26 16 9 30 31 32 33 DDC_WP VGA_DET PANEL12V_EN PANELVCC_EN IVCOM BKLT_EN AUDIO_EN MUTE 3 DDC_WP 3 VGA_DET 2 PANEL12V_EN 2 PANELVCC_EN 5 IVCOM 2 BKLT_EN 7 AUDIO_EN 7 MUTE 24C16 P5.0 P5.1 P5.
5 4 3 2 1 I310 CEM9435A 5 VDD15V 3 FB320 2 AUDIO_15V VDD15V 6 AUDIO_15V 2 7 PBY201209T-300Y-S D C409 R411 C410 0.1uF 10K 100uF/25V L301 1 8 D 45uH DRWW 10 X 10 FB321 R412 DGND 4 2,3,4,5,6 C411 PBY201209T-300Y-S 4K7 ANA-GND 0.1uF VCC5V R413 3 10K R415 6 2 AUDIO_EN VCC5V 2,3,6 ANA-GND Q311 R414 MMBT3904 100K 4K7 1 R416 MUTE 6 10K ANA-GND C412 C413 C414 470uF/25V 0.1uF 0.1uF C C ANA-GND ANA-GND R418 1K IN_R C416 2 1 9 1.
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