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. [. . . ] 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. for the minimum expected life of the lamps. 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. This panel shall be approved for use in this monitor. 1. 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. This is independent of whether the unit is operating or off . 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. 1. 4. 5. 8 LCD Inspection Put LCD panel on inspection table and illuminate the panel with a daylight fluorescent lamp located above the panel surface such that the luminance at the LCD panel is between 1000 lux and 1500 lux . Defect limits are given in Table 4 . Viewing distance is to be approximately 35-50cm Ambient illumination is to be 300 to 700 lux. [. . . ] Check I312 pin5 signal whether if correct. 5. 6. 2 Abnormal DDC2 (DVI) Failure Point Confirm the output of serial data on I313 pin6 synchronize SCLK at TTL level NG I313 is defected OK Failure Point 1. The host machine isn't communicating in DDC2 mode. The video cable may have defected or may not be established connection for DDC. The I313 pin6 and P305 pin6 may have no signal or incorrect. [. . . ]