2 Product Specifications2-6 GS17VS/GS17VT/GS19VS/GS19VT/GS15MS/GS17MS/GS19MSQ R SPOVideoSync SyncHorizontal VerticalC D EPOBAVideoSync SyncSeparate Sync2-6 Timing ChartThis section of the service manual describes the timing that the computer industry recognizes as standardfor computer-generated video signals.C DA OEB PVideoSync SyncVideoQ R SA : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync widthC : Back porch D : Active time Q : Back porch R : Active timeE : Front porch S : Front porchVIDEOAB OPQ R SHorizontal VerticalBGreenVerticalP Q R SOHorizontalH/V Composite SyncSync-on-Green79.97512.5041.0671.8379.4810.11975.02513.3290.0380.47512.8040.013135.000PositivePositiveSeparate1280/75 Hz1280 x 10241280/60 Hz1280 x 102463.98111.8521.0372.2969.2590.00060.02016.0050.0470.59415.6300.016108.000PositivePositiveSeparate31.46931.7773.8131.58926.0580.31870.08714.2680.0640.85813.1550.19128.322NegativePositiveSeparatefH (kHz)A μsecB μsecC μsecD μsecE μsecfV (Hz)O msecP msecQ msecR msecS msecClockFreq.(MHz)PolarityH.SyncV.SyncRemarkIBM640/75 Hz640 x 480800/60 Hz800 x 600800/75 Hz800 x 6001024/60 Hz1024 x 7681024/75 Hz1024 x 768VGA2/70 Hz720 x 400VGA3/60 Hz640 x 480Table 2-1 Timing Chart31.46931.7783.8131.58926.0580.31859.94016.6830.0640.79415.7610.06426.175NegativeNegativeSeparate37.50026.6672.0323.81020.3170.50875.00013.3330.0800.42712.8000.02731.500NegativeNegativeSeparate37.87926.4003.2002.20020.0000.00060.31716.5790.1060.60715.8400.026140.000PositivePositiveSeparate46.87521.3331.6163.23216.1620.32375.00013.3330.0640.44812.8000.02149.500PositivePositiveSeparate48.36320.6772.0922.46215.7540.36960.00416.6660.1240.60015.8800.06275.000NegativeNegativeSeparate60.02316.6601.2192.23513.0030.20375.02913.3280.0500.46612.7950.01778.750PositivePositiveSeparateMode VESA(GS17VS/GS19VS/GS17VT/GS19VT/GS17MS/GS19MS)VESA (GS17VS/GS19VS/GS17VT/GS19VT/GS15MS/GS17MS/GS19MS)Timing