User manual ACER SM071121V3 SERVICE MANUAL

[. . . ] ACER ACER_LCD_P243W_SM071121V3 Service Model ID:MB243WABNS Service Manual Table of Contents Important Safety Notice------------------------------------------------------------------------------------- 01 01. Product Specification--------------------------------------------------------------------------------- 02 02. OSD Menu-----------------------------------------------------------------------------------------------08 03. Exploded Diagram ------------------------------------------------------------------------------------- 10 04. [. . . ] 1. 4. 3 Polarizer Hardness The outer face of the front polarizer panel shall be covered with a coating with a # 3 hardness value . 1. 4. 4 Backlight Requirements 1. 4. 4. 1 General Requirements The backlight assembly shall be designed to support field replacement at the customer site or authorized service center. The lamps shall have a continuous operating life of at least 40, 000 hours at 25. The operating life is defined as having ended when the illumination of light has reached 50% of the initial value. The lamps shall extend a sufficient amount from the edge of the light guide that sputtering over the life of the lamps shall not cause degradation of the luminance uniformity (such as non-illuminated bands along the edges of the display). 1. 4. 4. 2 Lamps Startup Time The backlight lamps shall start about 2 sec of the time the monitor power switch is pressed or the monitor is restarted from a power - down mode . The starting time shall stay about 2 sec. Test conditions are as follows : Ambient Light ---------------------Temperature-------------------------Inactive Time ----------------------1. 4. 5 Defects 1. 4. 5. 1 Visual Inspection The LCD panel shall be inspected with all pixels set to white, black , red , green , and blue. The color variation, brightness variation , and overall appearance must not be perceived as poor quality by Lite-On . Areas and / or parameters considered questionable shall be subjected to detailed measurements . < 1. 0 lux 10 > 24 hours Power Consumption Line Fuse Initial Cold Start Inrush Current Hot Start Cycle Under Voltage Line Transient 1. 3. 8 Display Communications Channel The monitor assembly shall provide a display communications channel that conforms to VESA DDC2Bi hardware requirements. This configuration shall contain the 128-byte EDID file as specified by VESA EDID standard. The monitor should not write to the EDID file for the first two minutes of operation following power-up UNLESS some action taken by the user or the host CPU forces the write (for instance, requesting the serial number via the OSD). Furthermore, it is recommended that CMOS switches be incorporated to isolate the DDC IC from outside connections while the EDID Fault Management is being updated. This is to prevent corruption of the data by attempts to read the data while it is being changed. 1. 3. 9 Firmware Update Function (same ISP function) The update firmware need through from the D-Sub connector, use DDC I2C bus to do update firmware. 1. 4 PANEL ELECTRICAL 1. 4. 1 General Requirements The panel used as the display device shall be an WUXGA resolution, 24W TFT-LCD. Product Specification (continued) ACER P243W 7 Go to cover page 1. 4. 5. 2 Display Degradation Over the life of the product , variation of the parameters specified in Panel specification shall be maintained within reasonable limits. The panel must not exhibit any significant defects while in operation ( excluding the CCFL operation ). This does not in any way change the warranty given by the panel manufacturer . 1. 4. 5. 3 Light Leakage Except for the active display area , there shall be no light emission visible from any angle from any other part of the display . For this test , the ambient illumination must follow panel's specification. 1. 4. 5. 4 Allowable Defects No cosmetic defects are allowed except those specified below. The conditions of visual inspections are as follows For 24W Series. 1. 4. 5. 6 Smudges, Streaks and Smears When viewing the panel oriented so as to maximize reflected light , there shall be no visible smudging , streaking, smearing or other nonuniformity from contaminants , fingerprints, or defects in any of the visible surfaces. 1. 4. 5. 7 Other Defects Undefined defects that are considered to be rejectable by Lite­On will be reviewed by Lite-On as they become apparent. These panels will be referred to the Lite - On Corporate / Manufacturer Purchasing Agreement for disposition. [. . . ] Video signal cable disconnected. OK Failure Point Green, Blue, Red signals are flow in the same path. R390 is open. Check the R. G. B signals on I314 pin40, pin42, and pin45 which should have voltage level at 0. 7Vpp max. NG OK Failure Point Check all LVDS signal pins of I314 whether if output correct signals. NG 1. Printed wire is broken between I314 and P306. OK Proceed to "5. 8 Checking the resolution change IC movement" section. 24 ACER P243W 5. Troubleshooting (continued) Go to cover page 5. 5 Abnormal OSM display - OSD Adjusment Problem Failure Point Check the input TTL level whether if it was altered upon pressing the function keys. [. . . ]