Acer AL1702 Support Question
Acer AL1702 Support Question
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Question posted by prakashinfo3939 on December 11th, 2011
What Is The Price Of Logic Board V:1.0
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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 3
... 7 4. Checking the back light unit 15 4. Abnormal screen 16
Page 1 Inverter 4 3. Nothing displays on screen (Screen is black, color of LED is amber 11 2. Power Board Operation Therory 3 2. 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 green...
AL1702 Service Guide - Page 4
... control circuit of vertical sync pulse 19 8 Checking the resolution change IC movement 20 9. Checking the Audio circuit [option 22 11. Power board 24
3) Spare Parts
Recommended Spare Parts List 25
Page 2 AL1702
6. Checking the DC/DC converter circuit 21 10. Checking inverter board circuit 23 12. Abnormal plug and play operation 18 7.
AL1702 Service Guide - Page 5
...to bias from C805 and R805,R803.
PowerBoard Operation 1.1 Line filter consists of I801. AL1702
1) Circuit Description
1. The voltage of pin 2 of T802 becomes large also. Suppose .... 1.7 PWM : 1.7.1 Start : When power is short to generate +12V and +22V respectively. Power Board Block Diagram
Line Filter
Rec. & Filter
Power Transformer
Outpur Rec. & Filter
PWM
Driver FB
Page 3 ...
AL1702 Service Guide - Page 7
...diagrams MAIN PWB 5 of 8) 3.2.1 P301 connector A 5V power supply for LCD module, MCU, logic.
And a 12V power supply for the system, input keypad function, output LED, control audio function... and also for the power saving sequence. 3.2.6 Q301,Q302 : Adjust back light luminance for the LCD monitor. Interface Operation 3.1 Top (Circuit diagrams MAIN PWB 2 of 8)
This page is function block. (1) ...
AL1702 Service Guide - Page 8
...from H to L of LCD module power, and disable I307 pin32 (AUDIO_EN) from I307 MCU. Page 6 AL1702
3.5.3 X302 crystal The X302 crystal is 11.0592MHz, support the operated clock to the MCU.
3.5.4 Reset ...signal pin 37 from H to L of MCU. Control is effected through DDC2Bi bus control LCD monitor. Table 1 Related ports of which are updated as required. The pin29 is bus clock (DDC_CLK),...
AL1702 Service Guide - Page 9
... on when active the power supply again. If the horizontal sync signal is audio output port. 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...
AL1702 Service Guide - Page 12
...I /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 15
...Point
1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board. NG OK
Next Page
Check if the voltage on I302 pin3 that is power DC...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 I302, pin2, 4. Continue
AL1702
Check the 3.3V power are supplied on I302, pin2, 4.
AL1702 Service Guide - Page 17
... broke between P301 pin5, Q301, Q302 and I305 pin73. 2) I305 is failure.
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.
NG OK
Failure Point
1) printed wire broke between P301 pin6, R306 and I307pin 31. 2) I307...
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 23
.... 2) FB301, FB302 open.
Failure Point I301 is failure. Checking the DC/DC converter circuit
AL1702
Check the 5V is input to I301 pin3.
9. NG OK
Check the 3.3V is output from... open .
NG OK
Check the 2.5V is failure. NG OK
Failure Point 1) Power wire disconnection. 2) Power board is output from I301 pin2, 4. NG OK
Failure Point 1) Printed wire broke between I301 pin2. 4, I302 pin2...
AL1702 Service Guide - Page 24
... OK
Check the Audio output signal to P309
NG OK
Failure Point
1) Audio wire disconnection. 2) Audio Jack board failure. Failure Point 1) Printed wire broke between I307 pin32 and I310 pin4. 4) Q311 failure. 5) I310 failure. AL1702
Page 22 Failure Point 1) Printed wire broke between P301 pin7. 8 and I310 pin1, 2, 3. 2) FB320 open. 3) Printed wire...
AL1702 Service Guide - Page 25
... P802 is over 2V.
NG OK
Check full-bridge (I102, I103, D102, D103, C123) work right. Check Q106, Q102 and repair them .
AL1702
Page 23 11. Checking inverter board circuit
Check C101 pin is not inverter problem. On/off pin of I101 is over 2V.
Check C115, R108, I101 and repair them...
AL1702 Service Guide - Page 26
... D809, D810, D811, C818, C817, C822, T802 have same pulse or not. Turn switch on or not. Page 24
AL1702
Connect it right
Check F801, D801, P801 and repair them . Check Q803, R813, R814, D806, R812 and repair them ...Check pin 1 of I801 have same pulse or not.
Repair them. Power Board
Check output voltage +5V, +12V and 22V is connected right or not. No Yes
Check C807 is not ...
AL1702W Service Guide - Page 6
Table Of Contents
Chapter 1 Monitor Features
Introduction Electrical Requirements LCD Monitor General Specification LCD Panel Specification Support Timing Monitor Block Diagram Main Board Diagram Software Flow chart Main Board Layout Adjusting the viewing angle Rear Bezel
Chapter 2 Operating Instructions
External Controls Front Panel Controls Adjusting the picture OSD Message LOGO
Chapter 3 ...
AL1702W Service Guide - Page 14
... MONITOR will provide the 12V DC-power to inverter/power board.
CCFL Drive. Flat Panel and CCFL backlight
Inverter Board
AC-IN 100V-240
Main Board
Keyboard
HOST Computer
Video signal, DDC
14 The Inverter board will drive the backlight of panel and the DC-DC conversion, The Adapter will contain a main board, a power board, and keypad board...
AL1702W Service Guide - Page 41
Item
Picture
1
Description Base
2
shield
3
Key board
4
Panel
41 Part List
Above picture show the description of the following component.
AL1702W Service Guide - Page 48
...
1K 1/8W
! R910 10 1/4W
Q901 2SK2645-54MR
2
ZD905 RLZ18B
1
R938 10K 1/8W
FB901 BEAD
1
R912
2
220 1/4W
C909 470pF/25V
R914 0.47 2W
!!! Power board
1
SG901 NC
BD901
!
C903
0.47uF/275V
SG902 NC
+ C907 100uF/450V
R904 300K 1/4W
C938 1500pF/1KV
R932 300K 1/4W
R905 NC
R906 NC
C906...
AL1702W User's Guide - Page 20
CONNECTOR PIN ASSIGNMENT
1
5
6
10
11
15
PIN NO.
1. 2. 3. 4. 5. 6. 7. 8.
15 - Pin Color Display Signal Cable
DESCRIPTION
Red Green Blue Monitor Ground DDC-return R-Ground G-Ground B-Ground
PIN NO.
9. 10. 11. 12. 13. 14. 15. DESCRIPTION
+5V Logic Ground Monitor Ground DDC-Serial Data H-Sync V-Sync DDC-Serial Clock
19
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