Acer AL1702 AL1702 Service Guide
Acer AL1702 Manual
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- Acer AL1702 | AL1702 Service Guide - Page 1
Service Manual 17-inch LCD Monitor AL1702 - Acer AL1702 | AL1702 Service Guide - Page 2
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. Printed in Taiwan. Trademarks LiteOn - Acer AL1702 | AL1702 Service Guide - Page 3
AL1702 1) Circuit Description 1. Power Board Operation Therory 3 2. Inverter 4 3. Interface 5 3.1 Top 5 3.2 Power 5 3.3 VGA& DDC interface 5 3.4 Scaler MST8111A 5 3.5 Panel interface 5 3.6 Audio 7 4. Others 7 4.1 Detection of POWER switch status 7 4.2 Display mode identification 7 4.3 - Acer AL1702 | AL1702 Service Guide - Page 4
Checking the control circuit of vertical sync pulse 19 8 Checking the resolution change IC movement 20 9. 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 - Acer AL1702 | AL1702 Service Guide - Page 5
AL1702 1) Circuit Description 1. PowerBoard Operation 1.1 Line filter consists of C801, T801, C802, C803, C804. . Then oscillation of I801 is stop, shutting Q803 off immediately. Power Board Block Diagram Line Filter Rec. & Filter Power Transformer Outpur Rec. & Filter PWM Driver FB Page 3 - Acer AL1702 | AL1702 Service Guide - Page 6
function. 2.4 2.4.1 Output drivers: The configuration prevents any shoot-through issue associated with bridge-type power conversion applications. Adjusting Circuit Block Diagram VCC ON / OFF Brightness control Regulator U.V.P. VDD Control IC : OZ960 Enable OSC SST Dimming control Output driver - Acer AL1702 | AL1702 Service Guide - Page 7
I304DDCEEPROM This IC is support DDC2B of the VESA standard, also plug and play for the PC host. 3.4 Scaler MST8111B (Circuit diagrams MAIN PWB 5 of 8) The I305 is scaled converter LSI for the LCD monitor. The analog R, G, B signal input entered from the video input circuit is converted into the - Acer AL1702 | AL1702 Service Guide - Page 8
and DDC2Bi function The DDC2Bi is VESA standard for the host PC system, it can through DDC2Bi bus control LCD monitor. The I309 will off DDC_CLK and DDC_DAT signal, when LCD monitor is no power. Can use ISP function for firmware modification. The pin29 is bus clock (DDC_CLK), the pin28 is bus data - Acer AL1702 | AL1702 Service Guide - Page 9
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, - Acer AL1702 | AL1702 Service Guide - Page 10
Table 2 video mode Mode Resolution 1 720x400 (70Hz) 2 640x480 (59.94Hz) 3 640x480 (66.67Hz) 4 640x480 (72Hz) 5 40 50 49.5 57.28 65 75 78.75 108 108 108 135 Polarity H V AL1702 Table 3 the Hsync, Vsync distinction Indication resolution 720 x 400 640 x 480 800 x 600 832 x 624 1024 x 768 1152 - Acer AL1702 | AL1702 Service Guide - Page 11
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 LED_G (LED) PANELVCC_EN (Panel VCC) PCLK/DATA (LVDS - Acer AL1702 | AL1702 Service Guide - Page 12
No. Port Signal Name Initial Function Setting 3 P5.0 KEY_POWER H ON/OFF monitor power 2 P5 H UART interface data OUT 19 P3.2 INT H Interrupt signal from the scaler 13 P3.4 ISDA H EEPROM data bus power enable 31 P6.5 BKLT_EN L Back light power enable 32 P6.6 AUDIO_EN L Audio power - Acer AL1702 | AL1702 Service Guide - Page 13
that it can't be distinguished. Proceed "No OSM display" section. Check if the sync signal from computer is output and if the video cable is connected normally. NG OK Input the sync signal of computer, or change the cable. Proceed "checking the resolution change IC movement" section. Page 11 - Acer AL1702 | AL1702 Service Guide - Page 14
the video cable. 3)Change the video cable. Check OSM menu is display on screen when you push the "PROCEED" key. NG OK Proceed "Abnormal sreen" dection" Check if the LCD video signal cable is connected between the MAIN PWB and LCD module. NG OK Failure Point The cable is disconnected. Next Page - Acer AL1702 | AL1702 Service Guide - Page 15
Continue AL1702 Check the 3.3V power are supplied on I302, pin2, 4. NG OK Check if the voltage on I302 pin3 that is power DC at 5V. NG OK Failure Point 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 - Acer AL1702 | AL1702 Service Guide - Page 16
Continue AL1702 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. Check the P305 all LVDS signals. NG OK Failure Point 1) Printed wire broke betweenP305 and I305 LVDS signals. 2) I305 is failure. Failure - Acer AL1702 | AL1702 Service Guide - Page 17
3. Checking the back light unit AL1702 Is +12V supplied to inverter PWB ? (by the power board) NG OK Failure Point 1) Inverter cable disconnection. 2) Power board failure. Check the BKLT_EN signal of the rectangle input P301 pin 6 at TTL high level. NG OK Failure Point 1) printed wire broke - Acer AL1702 | AL1702 Service Guide - Page 18
4. Abnormal screen AL1702 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 - Acer AL1702 | AL1702 Service Guide - Page 19
5. Abnormal OSM display adjust problem AL1702 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 - Acer AL1702 | AL1702 Service Guide - Page 20
the voltage on I304 pin8 that is power DC 5 V. NG OK Failure Point 1) Printed wire broke between I304 pin8, D309, D310 and P302 pin13. 2) D309 or D310 is failure. 3) D315 is failure. Check the voltage on P302 pin11, 12 that is serial data / clock signal. NG OK Failure Point TheVideo cable is - Acer AL1702 | AL1702 Service Guide - Page 21
7.1 Checking the control circuit of horizontal sync pluse AL1702 Check the horizontal sync signal on P302 pin3 TTL level. NG OK Failure Point Video cable is failure. Check the horizontal sync signal on I305 pin37 TTL level. NG OK Failure Point Process "Checking the resolution change IC movement - Acer AL1702 | AL1702 Service Guide - Page 22
the resolution change IC movement AL1702 Check +3.3V supply on I305 pin11, 21, 84, 94, 104, 114, 126, 55, 65, 35, 45, 51, 53. NG OK Proceed " Checking the DC/DC converter circuit" section. Check +2.5V supply on I305 pin18, 87, 97, 117. NG OK Proceed " Checking the DC/DC converter circuit - Acer AL1702 | AL1702 Service Guide - Page 23
circuit AL1702 Check the 5V is output from P301 pin1, 2 NG OK Check the 5V is input to I302 pin3. NG OK Check the 3.3V is output from I302 pin2, 4. NG OK Failure Point 1) Power wire disconnection. 2) Power board pin2. 4, I302 pin2, 4 and I305 MST8111A power supply pin. 2) FB314, FB315, FB316, - Acer AL1702 | AL1702 Service Guide - Page 24
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. NG OK Check the 12V is input to I311 pin15, 16. NG OK Check the VOLUME PWM signal 1) Speaker failure. 2) Prined wire - Acer AL1702 | AL1702 Service Guide - Page 25
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. NG OK It is not inverter problem. Check pin 5 of I101 is 5V. NG OK Check CN102, CN103 is connected right. NG OK Check pin 3 of I101 is over - Acer AL1702 | AL1702 Service Guide - Page 26
not. Yes No It is not power board problem. Check power switch is turn on or not. No Yes Check power cord (P801), signal cable (P302), P802, P803, same short circuit, or the output +5V/+12V/+22V is over load. No Yes Check feedback circuit around I802, I803 and the other components and repair them. - Acer AL1702 | AL1702 Service Guide - Page 27
3. Recommended Parts List AL1702 Note: 1. If you have spare parts need, please check BOM to get the last release part number and related information. No. Location Part Number Description 1 I301 6442036518 IC Linear AIC 1117-25CETR TO-252 2 I302 6442023326 IC Linear AIC 1084-33CM TO-263 3 - Acer AL1702 | AL1702 Service Guide - Page 28
21-3 21-10 21-12 E ITEM SUB-ITEM PART NO. DESCRIPTION Q'TY 1 7737510250-0A F/C ASS'Y SCREW M3x6(I/F BD) 2 8 5114300037 POWER BD 1 9 7111230061-0A SCREW M3x6 ) 4 14 7748708650-0A AC SUPPORT 1 15 7130430061 SCREW M3x6(AC SPEAKER 1 26 7141220061-0A SCREW M2x6(SPEAKER) - Acer AL1702 | AL1702 Service Guide - Page 29
- Acer AL1702 | AL1702 Service Guide - Page 30
5 D C B A 5 4 3 2 ACER AL1502 / AL1702 SCHEMATIC REV 02 PTB-1468 27 April 2004 ROAD MAP DESCRIPTION TITLE SHEET TOP POWER VGA & DDC INTERFACE SCALER MST8111/6B PANEL INTERFACE AUDIO REVISION HISTORY REV. 02 DESCRIPTION BASED ON SCHEMATICS FOR ACER SHEET NO. 1 2 3 4 5 6 7 BY KT.LIN LAST - Acer AL1702 | AL1702 Service Guide - Page 31
PANEL12V_EN BKLT_EN PANELVCC_EN IVCOM B VCC5V VDD15V VCC3V3 VCC2V5 VCC5V VDD15V VLCD12V VLCD BKLT_ADJ DGND VLCD12V VLCD BKLT_ADJ VCC5V VDD15V AUDIO_EN MUTE 2.POWER B6 AUDIO_EN MUTE VOLUME VOLUME VCC5V VDD15V 7.AUDIO DGND ALE RDZ WRZ HWRESET INT AD0 AD1 AD2 AD3 BKLT_ADJ VOLUME 4.SCALER - Acer AL1702 | AL1702 Service Guide - Page 32
C AIC1084-33CM 47uF/25V 0.1uF(NC) 47uF/25V 0.1uF(NC) 3 6 PANELVCC_EN R311 1K 2 Q303 MMBT3904 4K7 C325 0.1uF VDD15V Note : If input power is +12V install R378. R378 1 0(NC) B FB305 B PBY201209T-121Y-S(NC) TO-252 I303 VCC12V VCC12V FB307 PBY201209T-121Y-S(NC) I313 AO3401(NC - Acer AL1702 | AL1702 Service Guide - Page 33
5 4 3 2 1 R317 100 VGA_DET 6 FB309 SBK160808T-300Y-S R318 47 C332 47nF RIN 4 3 P302 14 VGA_CON 13 PC5V D 12 SCL_VGA 11 SDA_VGA 10 9 RED+ 8 RED- 7 GREEN+ 6 GREEN- 5 BLUE+ 4 BLUE- 3 HSYNC_IN 2 VSYNC_IN 1 JWT-A2001WV2-14 VCC5V 1 2 D301 MMBD7000 C331 0.1uF - Acer AL1702 | AL1702 Service Guide - Page 34
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 18 87 97 117 11 21 84 94 104 114 126 I305 MST8011B/8111B D 45 51 55 65 VCC3V3 FB314 VPO 2 VCC3V3 PBY160808T-600Y-S C351 C353 C354 C355 - Acer AL1702 | AL1702 Service Guide - Page 35
5 4 3 2 1 4 PA[0..7] D PA[0..7] 4 PA[0..7] PA2 RA1P PA3 RA1N PA[0..7] PA0 LVACKP PA1 LVACKM PA2 LVA2P 4 PB[0..5] PB[0..5] PB0 RB1P PB1 RB1N PB2 RB2P PB3 RB2N P303 52 51 P304 32 31 D PA4 RA2P PA3 LVA2M PB4 RB3P PA5 RA2N PA4 LVA1P PB5 RB3N RA3N FB0N 50 RB3N B0N 30 PA6 RA3P - Acer AL1702 | AL1702 Service Guide - Page 36
5 4 3 2 1 VCC5V C393 R365 R366 R367 R368 R369 R370 R371 C394 0.1uF 4K7 4K7 4K7 4K7 4K7 4K7 4K7 D 10uF/16V VCC5V 6 5 4 8 43 44 C395 22pF I307 C VCC5V C398 0.1uF I308 1 2 3 4 A0 A1 A2 GND 24C16 VCC WP SCL SDA 8 7 6 5 R383 4K7 R381 4K7 D316 1N4148 3 DDC_WP 3 - Acer AL1702 | AL1702 Service Guide - Page 37
5 4 3 2 1 I310 CEM9435A VDD15V 5 3 FB320 6 2 VDD15V AUDIO_15V AUDIO_15V 2 7 PBY201209T-300Y-S 1 L301 D C409 R411 C410 8 D 45uH DRWW 10 X 10 0.1uF 10K 100uF/25V FB321 4 2,3,4,5,6 DGND R412 PBY201209T-300Y-S ANA-GND 4K7 R413 C411 0.1uF VCC5V 10K VCC5V 2,3,6 6 - Acer AL1702 | AL1702 Service Guide - Page 38
Printed in Taiwan