Acer AL1931 AL1931 Service Guide - Page 13

• Polarity • Amplitude • Display Color Positive 0 - 0.7 +/- 0.05 Vp same as LCD panel 2.4.2 Sync input • Signal • Polarity separate horizontal and vertical sync, or composite sync which are TTL compatible positive and negative. 2.4.3 Interface frequency The following frequency range is generalized by supported timing. If the entered mode does not match the supported timing the display optimization will not be assured. • Horizontal Frequency 30KHz --80KHz(analog), 31.5- 64KHz(digital) • Vertical Frequency 56Hz ---------75Hz DISPLAY MODES MONITOR MODE NO. 1 2 3 4 SCREEN RESOLUTION 640X480 640X480 640X480 720X400 HORIZONTAL SYNC RATE (kHz) 31.5 37.8637.531.5 - 5 800X600 37.8 + 6 800X600 48.07 + 7 800X600 46.87+ 8 1024X768 48.4 - 9 1024X768 56.47 - 10 1024X768 60.0 + 11 1280X1024 64.0 + 12 1280X1024 80.0 + VERTICAL SYNC RATE (Hz) 60.0 72.8075.070.0 + 60.0 + 72.18 + 75.0+ 60.0 70.07 75.0 + 60.0 + 75.0 + VIDEO CLK (MHz) 25.0 31.5 31.5 28.0 40.0 50.0 49.5 65.0 75.0 78.75 108.5 135.0 STANDAR D Defacto VESA VESA Text Defacto VESA VESA VESA VESA VESA VESA SXGA SXGA 12