Acer AL1906 AL1906 Service Guide
Acer AL1906 Manual
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- Acer AL1906 | AL1906 Service Guide - Page 1
Acer AL1906 Service Guide - Acer AL1906 | AL1906 Service Guide - Page 2
Service Guide Version and Revision No. Version 1 1.0 Release Date Apr.-21-2006 Revision Initial release 1 - Acer AL1906 | AL1906 Service Guide - Page 3
Technology Corp. ACER AL1906 Service Manual. Printed in Fujian. Disclaimer The information in this guide is subject to change without notice. Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any - Acer AL1906 | AL1906 Service Guide - Page 4
Service Guide. For ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You MUST use the list provided by your regional Acer office to order FRU parts for repair and service cables and AC power cord, if - Acer AL1906 | AL1906 Service Guide - Page 5
overload power strips and extension cords. Overloading can result in fire or electric shock. Never push any object into the slot on the monitor cabinet. It could short circuit parts causing a fire or electric shock. Never spill liquids on the monitor. Do not attempt to service the monitor yourself - Acer AL1906 | AL1906 Service Guide - Page 6
Features 6 Induction Electrical Requirements LCD Monitor General Specification LCD Panel Specification Support Timing Block Diagram Main Board Diagram Software Flow chart Main Board Layout Front Bezel Rear Bezel Chapter 2 Operating Instructions External Controls Front Panel Controls Adjusting - Acer AL1906 | AL1906 Service Guide - Page 7
Chapter 1 Introduction Scope This specification defines the requirements for the 19" MICROPROCESSOR based Multi-mode supported high resolution color LCD monitor. This monitor can be directly connected to general 15 pin D-sub VGA connector. It also supports VESA DPMS power management and plug & play - Acer AL1906 | AL1906 Service Guide - Page 8
distance Warm up time All specifications Fully functional Measuring equipment Control Power input Ambient temperature Analog input mode Measurement systems 225 lux 40 cm in front of LCD panel 30 minutes 5 seconds Chroma 7120 signal generator or equivalent, directly Connected to the monitor - Acer AL1906 | AL1906 Service Guide - Page 9
LCD Monitor General Specification Panel type Display size Display mode Pixel pitch Display dot Pixel clock Contrast ratio Brightness Response time (Tr+Tf) Display color Viewing angle Pc interface Signal connector Interface frequency Plug & play Power Input voltage Total output power 19 " active - Acer AL1906 | AL1906 Service Guide - Page 10
LCD Panel Specification LCD Panel Model (AU M190EN04) Display Type active matrix color TFT LCD Resolution 1280x1024 pixels Display Dot 1280x (RGB) x 1024 Display Area 376.32mm(H) x 301.06mm(V) Pixel Pitch 0.294mm(H) x 0.294mm(V) Display Color 16.2M (true) Lamp Frequency 50kHz( - Acer AL1906 | AL1906 Service Guide - Page 11
Modes There will be 20 total support modes to accommodate the above mode and other video modes within the frequency range of the monitor. 85Hz refresh rate Support Monitor should display 85Hz refresh rate mode as emergency mode. Monitor should display " Out of Range" warning menu at this mode - Acer AL1906 | AL1906 Service Guide - Page 12
Block Diagram The LCD MONITOR will contain a main board, a power board, keypad board and audio board which house the flat panel control logic, brightness control logic and DDC. The Inverter board will drive the backlight of panel. CCFL Drive. Flat Panel and CCFL backlight Power Board (Inverter - Acer AL1906 | AL1906 Service Guide - Page 13
Main Board Diagram SST25VF01020-4C-SAE OSD Control Interface (Keypad) LCD Interface Scalar TSUM16AK (Include: MCU, ADC, OSD etc) Crystal 14.318MHZ D-SUB Connector EEPROM AT24C16N EEPROM 24C02 12 - Acer AL1906 | AL1906 Service Guide - Page 14
Software Flow Chart 1 Y 2 3 N 4 N 5 Y 6 N 7 8 Y 9 N 10 11 Y N 12 N 13 Y Y N 14 15 16 Y 17 N 18 19 Y 13 - Acer AL1906 | AL1906 Service Guide - Page 15
global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode. 9) Save the power key status into EEPROM. Turn on the LED and set it to green color. Scalar initializes. 10) In standby mode? 11) Update the lifetime of back light. 12) Check the analog port, are there any signals coming - Acer AL1906 | AL1906 Service Guide - Page 16
Main Board Layout Label CN405 CN101 U401 X401 Part number 88G 35315F H 33G801724B H 56G 562100 93G 22 53 Description D-SUB 15PIN PIN HEADER 24P 2.0mm TSUM16AK CRYSTAL 14.318MHzHC-49U 15 - Acer AL1906 | AL1906 Service Guide - Page 17
, the picture can be adjusted to your personal preferences. • The power cord should be connected. • Connect the video cable from the monitor to the video card. • Press the power button to turn on the monitor position, The power indicator will light up. EXTERNAL CONTROLS FRONT PANEL CONTROL Item - Acer AL1906 | AL1906 Service Guide - Page 18
off your computer before performing the procedure below. 1. Plug the power cable of your monitor into a nearby outlet. Plug the other end of the power cord into the PC port. 2. Connector one end of 15-pin D-SUB cable to the back of the monitor and connector the other end to the computer's D-DUB port - Acer AL1906 | AL1906 Service Guide - Page 19
Chapter 2 Operating Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences. • The power cord should be connected. • Connect the video - Acer AL1906 | AL1906 Service Guide - Page 20
Button: Press this button to turn the monitor ON or OFF. And display the monitor's state. • Power Indicator: Green - Power on mode. Orange - Off mode. • to set the HPos, VPos, Clock and Focus. NOTES • Do not install the monitor in a location near heat sources such as radiators or air ducts, or in a - Acer AL1906 | AL1906 Service Guide - Page 21
Adjusting the Picture a. How to Adjust a Setting 1. Press the MENU-button to activate the OSD window. 2. Press to select the desired function. 3. Press the MENU-button to select the function that you want to adjust. 4. Press < or >to change the - Acer AL1906 | AL1906 Service Guide - Page 22
b. The Description For Control Function Main Menu Sub Menu Sub Menu Item Icon Icon Contrast Description Contrast from Digital-register. Brightness Backlight Adjustment Focus Adjust Picture Phase to reduce Horizontal-Line noise Clock Adjust picture Clock to reduce Vertical-Line noise. - Acer AL1906 | AL1906 Service Guide - Page 23
Item Icon Description Auto Config (Analog-Only Model) Information N/A Auto Adjust the H/V Position, Focus and Clock of picture. Show the resolution, H/V frequency and input port of current N/A input timing. Reset Clear each old status of Auto-configuration and set the color N/A temperature - Acer AL1906 | AL1906 Service Guide - Page 24
Wait This message, and the monitor do the auto config function. Input Not Supported Cable Not Connected When the Hsync Frequency, Vsync Frequency or Resolution is out of The monitor support range will show this message is No active signal input, will show this message, then enter power saving. 23 - Acer AL1906 | AL1906 Service Guide - Page 25
, following a time-out period, will automatically switch to an OFF mode. This reduces the monitor's internal power supply consumption. After the video input signal is restored, full power is restored and the display is automatically redrawn. The appearance is similar to a "Screen Saver" feature - Acer AL1906 | AL1906 Service Guide - Page 26
Machine Disassembly Chapter 3 This chapter contains step-by-step procedures on how to assemble the monitor for maintenance. Disassembly Procedure Disassemble the base 1. Remove hinge cover. (Fig 1) 2. Remove four screws to remove stand base. (Fig 2) Fig 1 Fig 2 25 - Acer AL1906 | AL1906 Service Guide - Page 27
Disassemble the front cover and rear bezel 1. Remove nine screws to remove back cover and front bezel. (Fig 3) 2. Remove connector wire with keyboard and main board. (Fig 4) Fig 3 Fig 4 26 - Acer AL1906 | AL1906 Service Guide - Page 28
Disassemble the shield Remove two screws to remove the shield. (Fig 5) (Remove the shield as arrow direction). Fig 5 27 - Acer AL1906 | AL1906 Service Guide - Page 29
Disassemble the main board 1. Remove three screws to remove main board. (Fig 6) 2. Remove connector wire with main board and panel. (Fig 7) Fig 6 Fig 7 28 - Acer AL1906 | AL1906 Service Guide - Page 30
3. Remove connector wire with main board and power board. (Fig 8) 4. Remove connector wire with main board and KEPC board. (Fig 9) Fig 8 Fig 9 29 - Acer AL1906 | AL1906 Service Guide - Page 31
Disassemble the power board 1. Remove four screws to remove power board. (Fig 10) 2. Remove connector wire with power board and panel. (Fig 11) Fig 10 Fig 11 30 - Acer AL1906 | AL1906 Service Guide - Page 32
Disassemble the panel Remove four screws to remove metal frame. (Fig 12) Fig 12 31 - Acer AL1906 | AL1906 Service Guide - Page 33
This chapter provides troubleshooting information for the AL1906: 1. No power No power Chapter 4 Press power key and look if the picture is normal NG Please reinsert and make sure the AC of 100-240 is normal NG OK Measure U701 PIN2=3.3V, U702 PIN2=3.3V Reinsert or check the power section NG - Acer AL1906 | AL1906 Service Guide - Page 34
2. No picture (LED is orange) No picture Measure U701 PIN2=3.3V U702 PIN2=3.3V OK NG X401 oscillate waveforms are normal OK NG Replace U701, U702 Replace X401 Check if the sync signal from computer is output and video cable is connected normally NG OK Replace U401 Input the sync signal of - Acer AL1906 | AL1906 Service Guide - Page 35
relative circuit,Q706, Q704 In normal operation, when LED =green, R725 NG Should =5 V, If PPWR no-response when the power switch Turn on and turn off, replace the U401-TSUM16AK 4. Keypad Board OSD is unstable or not working NG Is Keypad board connecting normally? OK - Acer AL1906 | AL1906 Service Guide - Page 36
5. PWPC No Power No power Check AC line volt 110V or 220V NG OK Check AC line Check the voltage of C904(+) OK NG Check start voltage for the pin3 - Acer AL1906 | AL1906 Service Guide - Page 37
No Backlight Check C201 (+) =12V NG OK Change F902 Check Q203/D201 Check ON/OFF signal NG OK Check U201 pin9=12V ? Check Interface board NG OK Check the pin1 of U201 have saw tooth wave Change Q201 or Q202 NG Change U201 OK Check D201 (-) has the output of square wave at short time. NG - Acer AL1906 | AL1906 Service Guide - Page 38
11 15 PIN NO. 1. 2. 3. 4. 5. 6. 7. 8. 15 - Pin Color Display Signal Cable (D-sub) DESCRIPTION Red Green Blue Monitor Ground DDC-Return R-Ground G-Ground B-Ground PI N NO. 9. 10. 11. 12. 13. 14. 15. DESCRIPTION +5V Logic Ground Monitor Ground DDC-Serial Data H-Sync V-Sync DDC-Serial Clock 37 - Acer AL1906 | AL1906 Service Guide - Page 39
the printed Service Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided by your regional Acer office to order FRU parts for repair and service of - Acer AL1906 | AL1906 Service Guide - Page 40
Exploded Diagram (Model: AL1906) 39 - Acer AL1906 | AL1906 Service Guide - Page 41
Part List Above picture show the description of the following component. Item Picture Description 1 BACK COVER Part No. 34G1574 RX B 2 STAND 34G1576 RX B 3 BEZEL 34G1573AQW B 4 BASE 34G1575 RX B 5 SCREW M1L1730 8128 6 SCREW Q1G 340 10128 40 - Acer AL1906 | AL1906 Service Guide - Page 42
Schematic Diagram Analog Input Chapter 7 11 12 13 14 15 HSI VSI 16 17 CN405 1DB15 RED+ 6 RED- 2 GREEN+ 7 GREEN- 3 BLUE+ 8 BLUE- 4 PC5V 9 PC5V 5 VGA_CON 10 FB410 FB411 FB412 0 1/16W 0 1/16W 0 1/16W R438 75 1/16W 2 3 1 2 3 1 2 3 1 D406 MLL5232B 5.6V D403 BAV99 D404 - Acer AL1906 | AL1906 Service Guide - Page 43
16W 100 1/16W 100 1/16W 4.7K 1/16W 4.7K 1/16W VCTRL 2 P[0..7] PA[8..13] PA[14..19] PB[0..5] PB[6..11] PB[12..23] GPO[0..4] WP KEY1 KEY2 POWER Volume AUDIO_MUTE AUDIO_STBY PA[0..7] 5 PA[8..13] 5 PA[14..19] 5 PB[0..5] 5 PB[6..11] 5 PB[12..23] 5 ESP 5 OSP 5 GPO[0..4] 5 R405 22K 1/16W R406 10K - Acer AL1906 | AL1906 Service Guide - Page 44
LVDS 4 PA[0..7] 4 PA[8..13] 4 PA[14..19] 4 GPO[0..4] PA[0..7] PA[8..13] 4 PA[0..7] PA2 RA1P PA3 RA1N PA4 RA2P PA5 RA2N PA6 RA3P PA7 RA3N PA8 PA9 PA10 PA11 PA12 PA13 GA1P GA1N GA2P GA2N GA3P GA3N PA[0..7] PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA12 PA13 LVACKP LVACKM LVA2P LVA2M LVA1P LVA1M LVA0P - Acer AL1906 | AL1906 Service Guide - Page 45
PC5V VCC3.3 4 Recommond to used "Blue" parts circuit for VCC1.8V if you want to suppoert DDC PC5V f3unction when system power off 3,4 +5V R732 +5V 10 1/16W Vf=0.7V~1V can't meet LDO spec. The BAT42, Vf is OK but the If=200mA(forward current) can not meet current spec. For RSDS and Panel VCC= - Acer AL1906 | AL1906 Service Guide - Page 46
Power board (adapter + inverter) R921 47 1/2W C921 0.001uF/500V +4 DB901 KBP206G 2 3 3 D921 FME-210B T901 2 +5V C927 0.1uF +12V +5V GND 1 2 3 CN901 CONN C935 NC Title 1.POWER OUTPUT 12V & 5 V Size Document Number Rev B PWPC1942AUA11P(715G1492-1) A Date: Sunday, May 22, 2005 - Acer AL1906 | AL1906 Service Guide - Page 47
1N4148 D208 1N4148 R228 1K 1/4W Title 2. FOR 19" 4 LAMPS INVERTER Size Document Number PWPC1942AUA11P(715G1492-1) Date: Sunday, May 22, 2005 Sheet 2 of Rev A 2 is power GND is signal GND 46