Try Xconfigurator. If you know the values and want to do it yourself, then these are the lines from my XF86Config-4 file
Section "Monitor"
Identifier "SAMTRON 55V"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30 - 55
VertRefresh 50 - 120
Option "dpms"
EndSection
(Horizync and VertRefresh are the ones you should modify. )
--Sarin
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