Acer AL1731 AL1731 Service Guide - Page 12

2.4 Input Signals 2.4.1 Video input • Type • Input Impedance • Polarity • Amplitude • Display Color Analog R, G, B., Digital TMDS 75 ohm +/- 2% 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 5 6 7 8 9 10 11 12 SCREEN RESOLUTION 640X480 640X480 640X480 720X400 800X600 800X600 800X600 1024X768 1024X768 1024X768 1280X1024 1280X1024 HORIZONTAL SYNC RATE (kHz) 31.5 37.8637.531.5 37.8 + 48.07 + 46.87+ 48.4 56.47 60.0 + 64.0 + 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 STANDARD (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 Defacto VESA VESA Text Defacto VESA VESA VESA VESA VESA VESA SXGA SXGA 11