Compaq Monitor TFT5015s User Manual page 20

Clock: Increase/decrease the value to minimize any vertical
I
bars or stripes visible on the screen background.
Clock Phase: Increase/decrease the value to minimize video
I
distortion or video jitter.
Note: When adjusting the Clock and Clock Phase values, if the
monitor images become distorted, continue adjusting the values
until the distortion disappears. To restore the factory settings,
select Yes from the Factory Reset menu in the on-screen display.
18 Compaq TFT5015 User's Guide