Acer AL1951 AL1951 Service Guide
Acer AL1951 Manual
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- Acer AL1951 | AL1951 Service Guide - Page 1
Acer AL1951 Service Guide - Acer AL1951 | AL1951 Service Guide - Page 2
Service Guide Version and Revision No. Version 1 1.0 Release Date Mar.-12 - 2005 Revision Original release 2 - Acer AL1951 | AL1951 Service Guide - Page 3
Technology Corp. ACER AL1951 Service Manual Printed in Taiwan. 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 AL1951 | AL1951 Service Guide - Page 4
to avoid possible hardware or software problems. Remind you to do specific actions relevant to the accomplishment of procedures. Preface Before using this information and the product it supports, please read the following general information. 1. This Service Guide provides you with all technical - Acer AL1951 | AL1951 Service Guide - Page 5
digital device, pursuant to Part 15 of the FCC Rules with the instructions, may cause user's authority to operate the equipment. 2. Shielded interface cables and AC power monitor to rain or moisture. Dangerously high voltages are present inside the monitor. Do not open the cabinet. Refer servicing - Acer AL1951 | AL1951 Service Guide - Page 6
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 AL1951 | AL1951 Service Guide - Page 7
Special Notes On LCD Monitors The following symptoms are normal with LCD monitor and do not indicate a problem. Notes Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the Power Switch and then turn it on again to make sure the flicker disappears. You - Acer AL1951 | AL1951 Service Guide - Page 8
1 Monitor Features Introduction Electrical Requirements LCD Monitor General Specification LCD Panel Specification Block Diagram Main Board Diagram Software Flow chart Main Board Layout Front Bezel Rear Bezel Adjusting the picture LOGO Chapter 2 Machine Disassembly Chapter 3 Troubleshooting Chapter - Acer AL1951 | AL1951 Service Guide - Page 9
Scope This specification defines the requirements for the 19" MICRO-PROCESSOR based Multi-mode supported high resolution color LCD monitor. This monitor can be directly connected to general 15 pin D-sub VGA connector and 24 pin DVI connector. It also supports VESA DPMS power management and - Acer AL1951 | AL1951 Service Guide - Page 10
distance : Warm up time All specifications : Fully functional : Measuring equipment : Control settings User brightness control : User contrast control : User red/white balance, Green/white balance and Blue/white balance control : Power input : Ambient temperature : Analog input - Acer AL1951 | AL1951 Service Guide - Page 11
LCD Monitor General Specification Panel type : 19 " active matrix color TFT LCD Display size SEC LTM190EX - L01 : 376.32mm (H) € 301.056mm(V) Display mode Pixel pitch Display dot : Normally white : 0.294mm(H) € 0.294mm(V) : 1280 x (RGB) €1024 Pixel clock : 135 MHz Contrast ratio - Acer AL1951 | AL1951 Service Guide - Page 12
LCD Panel Specification LCD Panel Model (SAMSUNG LTM190EX- L01) Display Type active matrix color TFT LCD Resolution 1280x1024 pixels Display Dot 1280x (RGB) x 1024 Display Area 376.32mm(H) x 301.056mm(V) Pixel Pitch 0.294mm(H) x 0.294mm(V) Display Color 16.7M (true) Lamp Frequency - Acer AL1951 | AL1951 Service Guide - Page 13
ITEM Symbol Condition MIN. Contrast Ratio (Center of screen) C/R 450 Response Time Rising Tr - Falling TF - Luminance of white (Center of screen) YL 250 Red RX RY 0.610 0.299 Color Chromaticity (CIE 1931) Green Blue White Red GX 0.270 GY 0.570 BX θ=0, 0.120 φ=0 BY Normal - Acer AL1951 | AL1951 Service Guide - Page 14
Supported Timing Mode VGA SVGA XGA SXGA DOS DOS XGA VGA SVGA VESA MODES Horizontal Vertical Nomina Sync Nomin Sync l Polarity al Polarity Resolution Total Freque ncy Freq. +/- 1 +/- Hz 0.5kHz 640x480@60Hz 800 x 525 31.469 N 59.940 N 640x480@72Hz 832 x 520 37.861 N 72.809 N - Acer AL1951 | AL1951 Service Guide - Page 15
The LCD MONITOR will contain a main board (include: keypad board and audio board), an inverter board, adapter which house the flat panel control logic, brightness control logic and DDC. The Inverter board will drive the backlight of panel. The adapter will provide the 12V DC-power to inverter/power - Acer AL1951 | AL1951 Service Guide - Page 16
Main Board Diagram EEPROM 24C16 MCU LCD Interface Scaler TSU56AK PQFP-128 (Include: ADC, OSD etc) Crystal 14.318MHZ OSD Control Interface (Keypad) DVI Connector EEPROM 24C02 D-SUB Connector EEPROM 24C02 16 - Acer AL1951 | AL1951 Service Guide - Page 17
from eeprom. Check the pin PANEL1 and PANEL2 to tell which panel to get with it. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the scalar. 15) Are there any signals coming from analog or digital port? 16) Display " No Input Signal " message. And go into standby mode after the message - Acer AL1951 | AL1951 Service Guide - Page 18
Main Board Layout 18 - Acer AL1951 | AL1951 Service Guide - Page 19
U402 U403 U701 U702 CN301 CN302 CN402 CN601 CN602 CN603 CN701 CN702 U601 X401 X402 Part NO 56L1133 34 56L1133 34 56L 562 82 56L1125137SZB 56L1133 24 56L 563 11 56L 24P 2.0mm WAFER 4P RIGHT ANGLE PHONE JACK PHONE JACK power jack WAFER 6P RIGHT ANGLE PI TDA7496L BY ST CRYSTAL 14.318MHzHC-49U 20MHZ 19 - Acer AL1951 | AL1951 Service Guide - Page 20
Front Bezel 20 - Acer AL1951 | AL1951 Service Guide - Page 21
21 - Acer AL1951 | AL1951 Service Guide - Page 22
Rear Bezel 22 - Acer AL1951 | AL1951 Service Guide - Page 23
Adjusting the Picture How to Adjust a Setting 23 - Acer AL1951 | AL1951 Service Guide - Page 24
The Description For Control Function 24 - Acer AL1951 | AL1951 Service Guide - Page 25
25 - Acer AL1951 | AL1951 Service Guide - Page 26
monitor to operate properly, there must be a video input signal. This monitor meets the Green monitor standards as set by the Video Electronics Standards Association (VESA monitor's internal power supply consumption. After the video input signal is restored, full power is restored and the display is - Acer AL1951 | AL1951 Service Guide - Page 27
Chapter 2 Machine Disassembly This chapter contains step-by-step procedures on how to assemble the monitor for maintenance. Disassembly Procedure 1. Remove two screws to release back cover. (Fig 1). 2. Remove the base stand (Fig 2) Fig 1 Fig2 3. Remove four screws to release front - Acer AL1951 | AL1951 Service Guide - Page 28
Fig 3 Fig 4 5. Remove eleven screws to release top cover and bottom cover. (Fig 5) 6. Remove the main board. (Fig 6) 28 - Acer AL1951 | AL1951 Service Guide - Page 29
Fig 5 Fig 6 7.Remove six clamps to release shield and the main board. (Fig 7) 8.Remove the main frame. (Fig 8) 9.Remove the inverter board. (Fig 9) 29 - Acer AL1951 | AL1951 Service Guide - Page 30
Fig 7 Fig 8 30 - Acer AL1951 | AL1951 Service Guide - Page 31
Fig 9 31 - Acer AL1951 | AL1951 Service Guide - Page 32
This chapter provides troubleshooting information for the AL1951: 1. No power No power Press power key and look if the picture is normal NG Measure 12V input voltage OK NG Check the adapter section Measure U702 PIN2=5V? NG OK Replace U702 NG X402 oscillate waveform is normal NG - Acer AL1951 | AL1951 Service Guide - Page 33
2. No picture (LED is orange) No picture NG Key is under control? OK X401 oscillate waveform is normal X402 oscillate waveform is normal NG Replace X402 OK Replace U402 OK NG Replace X401 NG Check if the sync signal from computer is output and video cable is connected normally Replace U401 - Acer AL1951 | AL1951 Service Guide - Page 34
3. Panel Power Circuit Measure Q703 base is high level? OK NG Check Q703 and Q704 are broken or CN503 solder? Check Correspondent component. NG OK Replace PANEL X402 oscillate waveform is normal NG Replace X402 OK Replace U402 NG Replace U401 34 - Acer AL1951 | AL1951 Service Guide - Page 35
4. Keypad Board OSD is unstable or not working NG Is Keypad board connecting normally OK NG Is Button Switch normally OK NG Is Keypad board normally Connect Keypad Board Replace Button Switch Replace Keypad Board 35 - Acer AL1951 | AL1951 Service Guide - Page 36
5. Inverter Board No Backlight Check CN801 Pin1 =12V OK NG Check adapter Check ON/OFF signal NG OK Check U801 PIN3 voltage is normal? OK NG Check U801 PIN18 triangular wave is normal Check Interface board Check - Acer AL1951 | AL1951 Service Guide - Page 37
6.No Audio Mute and volume setting is ok? NG OK Reset mute and volume Check power supply of U601 is 12V? NG OK Check input signal of U601is ok? Check connecting is ok? NG Reconnect NG OK Check correspondent component Replace U601 NG Replace speaker Connector Information 37 - Acer AL1951 | AL1951 Service Guide - Page 38
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 PIN NO. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 24 - Pin Color Display Signal Cable (DVI) DESCRIPTION TMDS Data2TMDS Data2+ TMDS Data 2/4 Shield TMDS Data4TMDS Data4+ DDC - Acer AL1951 | AL1951 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 AL1951 | AL1951 Service Guide - Page 40
Exploded Diagram (Model: AL1951) 40 - Acer AL1951 | AL1951 Service Guide - Page 41
Part List Item 1 Picture 2 Description Hinge cover Part No. 33G4841 QT L 33G4843 QT L Bezel 34G1541AQW B 3 Back cover 34G1542 QT B 4 SHIELDING 85L6117 1 41 - Acer AL1951 | AL1951 Service Guide - Page 42
5 MAIN FRAME 15L6191 1 6 Panel 750LLS90EX1 7 Power board INPC1942SEA1 8 Main board CBPC980KS2AY 9 Speakers 78G 322 3 L& 78G 322 3 R 42 - Acer AL1951 | AL1951 Service Guide - Page 43
- Acer AL1951 | AL1951 Service Guide - Page 44
VCPU VCC12V_AUDIO VCC3.3 VCC1.8 AdjBACKLITE VAA1 VAA2 VAA3 VAA4 VLCD 2.POWER R+ RG+ GB+ BCLK+ CLK- CSZ SCL SDA HWRESET INT PA[0..9] PB[0..9] B5 PA[0..9] PB[0..9] VLCD VLCD 5.PANEL INTERFACE Title Size B Date: TSU56AK FOR ACER Document Number TOP Wednesday, January 19, 2005 Sheet 2 - Acer AL1951 | AL1951 Service Guide - Page 45
2 5 /ON 3 GND CN701 LP701 POWER JACK 1+12V_IN 6 3 5 2 4 1 INDUTOR-P VCC12V U701 SI-8050SD 1 VIN FBK 4 2 Vout + + Hole Screw Hole Screw Hole Screw Hole 1 1 1 1 1 1 Title Size B Date: TSU56AK FOR ACER Document Number POWER Wednesday, January 19, 2005 Sheet 3 Rev D of 8 45 - Acer AL1951 | AL1951 Service Guide - Page 46
0.1uF C315 0.1uF 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 VCC5V C319 0.1uF C320 0.1uF C321 0.1uF C322 0.1uF C323 0.1uF C324 0.1uF C325 0.1uF C326 0.1uF Title Size B Date: TSU56AK FOR ACER Document Number INPUT Wednesday, January 19, 2005 Sheet 4 Rev D of 8 46 - Acer AL1951 | AL1951 Service Guide - Page 47
VDVI 600 OHM C421 + 10uF/16V C422C423 0.1uF0.1uF 3 VAA4 VAA4 FB407 VDPLL 600 OHM C429 + 10uF/16V C430 0.1uF Title Size B Date: TSU56AK FOR ACER Document Number SCALER Wednesday, January 19, 2005 Sheet 5 Rev D of 8 47 - Acer AL1951 | AL1951 Service Guide - Page 48
+ RXEC+ RXE3+ LVB0P LVB1P LVB2P LVBCKP LVB3P LVA0P LVA1P LVA2P LVACKP LVA3P CONN VLCD VLCD 3 C448 + 47uF/16V C446 0.1uF C447 0.1uF Title TSU56AK FOR ACER Size Document Number A PANEL INTERFACE Date: Wednesday, January 19, 2005 Sheet 6 Rev D of 8 48 - Acer AL1951 | AL1951 Service Guide - Page 49
1000pF ENTER R430 470` 1/16W RIGHT R431 470` 1/16W AUTO R432 470` 1/16W LEFT R435 470` 1/16W POWER R436 470` 1/16W D404 BAV99 C443 0.001uF 2 3 1 2 3 1 2 3 1 2 3 1 VCPU SW401 LCD ONOFF SW402 KEY LEFT 0.001uF SW403 SW404 KEY AUTO KEY RIGHT SW405 KEY MENU Title TSU56AK FOR ACER Size Document - Acer AL1951 | AL1951 Service Guide - Page 50
20K` 1/16W R607 220K` 1/16W C613 0.1uF Volume 5 OUT_L OUT_R CN603 1 5 4 3 2 7 8 EAR PHONEJACK R608 R609 75` 1/16W 75` 1/16W OUT_R OUT_L CN601 1 2 3 4 SPEAKER CONN 50 Title TSU56AK FOR ACER Size A4 Document Number Rev Date: Wednesday, January 19, 2005 Sheet 8 of 8 - Acer AL1951 | AL1951 Service Guide - Page 51
Adapter Board 51 - Acer AL1951 | AL1951 Service Guide - Page 52
R838 1M` 1/16W C844 0.1uF/25V R839 1M` 1/16W R804 10K` 1/10W Inverter Board CN801 VIN 1 VIN 2 3 ON/OFF DIM 4 GND 5 GND 6 33L8009-6N-H F801 4A/24V C845 220uF/16V C848 220uF/25V + + Q804 DTC144WKA R801 1K` 1/16W Q802 DTA144WKA R803 100` 1/8W Q803 PMBS3904 VDD C801 1uF/25V C802 1uF/25V