Acer AL1702 Support Question
Acer AL1702 Support Question
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Question posted by bacumsal on May 9th, 2013
Model:acer Al1702. After A While No Picture
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Related Acer AL1702 Manual Pages
AL1702 Service Guide - Page 1
Service Manual
17-inch LCD Monitor AL1702
AL1702 Service Guide - Page 2
..., photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp.
Service Manual Versions and Revision
N o. ACER AL1702 Service Manual.
AL1702 Service Guide - Page 3
... 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. No display of screen (Screen is black, color of the I307 9
2) Trouble Shooting
1. AL1702 1) Circuit Description
1. Others 7 4.1 Detection of POWER switch status 7 4.2 Display mode identification 7 4.3 Power ON sequence 8 4.4 Power OFF sequence 8 4.5List of I/O Pin Assignments of LED is...
AL1702 Service Guide - Page 4
...
7.1 Checking the control circuit of horizontal sync pulse 19 7.2 Checking the control circuit of vertical sync pulse 19 8 Checking the resolution change IC movement 20 9. AL1702
6.
AL1702 Service Guide - Page 5
..., C817 to protect Q803, T802 from C805 and R805,R803. So the output voltage +5V will be pulled down to zero, shutting Q803 off immediately. AL1702
1) Circuit Description
1.
AL1702 Service Guide - Page 6
AL1702
2. The divided voltage on R116 will trigger the current amplifier (pin 9/pin 10 of lamp current. InverterOperation This unit operates on and provides +5VDC for ...
AL1702 Service Guide - Page 7
... signal. It can programmed scaler, control power save sequence for audio function. AL1702
3. Interface Operation 3.1 Top (Circuit diagrams MAIN PWB 2 of video signal ...voltage.
3.5.2 MCU (Circuit diagrams MAIN PWB 7 of 8) 3.2.1 P301 connector A 5V power supply for the LCD monitor. The device control signal is function block. (1) power. (2) VGA & DDC interface. (3) scaler MST8111B. (4)...
AL1702 Service Guide - Page 8
...in order to modify the respective setting values. The I309 will off DDC_CLK and DDC_DAT signal, when LCD monitor is pulled up at outside of MCU. Page 6 Table 1 Related ports of I307 based on Table 1....bus clock (DDC_CLK), the pin28 is bus data (DDC_DAT).
Related ports of I307
Pin No. AL1702
3.5.3 X302 crystal The X302 crystal is 11.0592MHz, support the operated clock to the MCU.
...
AL1702 Service Guide - Page 9
... each mode is assumed when the horizontal / vertical signals are as specified below . Horizontal frequency : 30 ~ 81.1KHz. 4.2.3 Power save mode The power save sequence. 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...
AL1702 Service Guide - Page 10
... Width (MHz)
28.322 25.175 30.24 31.5 31.5 36 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 x 864 1280 x 960 1280 x 1024 1280 x 1024...
AL1702 Service Guide - Page 11
... 1.84 sec
2 sec 2 sec
4.4 Power OFF sequence When the POWER switch is pressed, while the power supply is ON, the POWER ON signal is turned "H".
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 turn...
AL1702 Service Guide - Page 12
... /O pin assignments of the I307
Pin No. Port
Signal Name
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...: Other I /O Pin Assignments of the I305 MST8111B
73
PWM0 BKLT_ADJ
- Audio volume control
AL1702
Page 10 Backlight brightness control
74
PWM1 VOLUME
-
AL1702 Service Guide - Page 13
... connected
normally. Proceed "checking the resolution change the cable.
Check if the sync signal from computer is output and if the video cable is amber)
AL1702
Does OSM display when you push PROCEED buttom.
Page 11
No display of screen (Screen is black, color of computer, or change IC movement" section...
AL1702 Service Guide - Page 14
...
Refer "Checking the backlight unit" section"
Does computer output RGB video signals?
Check the host for failure.
NG OK
Failure Point The cable is green)
AL1702
Is backlight lit? Next Page
Page 12 NG OK
Proceed "Abnormal sreen" dection"
Check if the LCD video signal cable is display on the host...
AL1702 Service Guide - Page 15
... I302, pin2, 4. NG OK
Failure Point
1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board.
Failure Point I302 is failure
Page 13
Continue
AL1702
Check the 3.3V power are supplied on I302, pin2, 4.
AL1702 Service Guide - Page 16
... and I305 LVDS signals. 2) I305 is low. OK
NG OK
Check the PANELVCC_EN signal of the rectangle input Q303 pin2 at 5V. Page 14
Continue
AL1702
Check the 5V power are supplied on P305 pin 1, 2, 3 (to the LCD panel)
NG
Check if theVoltage on I312 pin,1 that is open. 2) Printed wire...
AL1702 Service Guide - Page 17
.... NG OK
Failure Point
1) printed wire broke between P301 pin5, Q301, Q302 and I305 pin73. 2) I305 is failure. Page 15 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...
AL1702 Service Guide - Page 18
.... 3) R322 is short or open. 4) R318 is short or open. 5) C332 is the same path, too.) 1)Printed wire broke between I305 and P305. Abnormal screen
AL1702
Check the R, G, B video signal from I305? Check the R, G, B input video signals on P302 of the Red signal. (A Green and Blue signal is short or open...
AL1702 Service Guide - Page 19
..., 4, 5, 6. (normal is
high level, when push buttom, generated low level plus )
NG OK
Failure Point I307 is short or open. Abnormal OSM display adjust problem
AL1702
Check the input TTL level whether was changed when pressed function keys on the I307 pin1, 2, 41, 42. (normal is high level, when push buttom...
AL1702 Service Guide - Page 30
...:
Date:
DESIGN:
Date:
CHECK:
Date:
CHECK:
Date:
Sheet: 1 of 8 Size: Custom
Title:M15_17AAX TITLE SHEET
DWG.NO:
8814680000-02
APPRO:
Date:
APPRO:
Date:
PCB. 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...
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