Lenovo ThinkVision T23i-30 23" Monitor - Manual (Page 32)

Chapter 3 Reference information 3-5
Manual image setup
If automatic image setup does not establish the image that you prefer, perform manual image
setup.
Note: Have your monitor powered on for about 15 minutes, until the monitor warms up.
1. Press at the bottom of the monitor to open the OSD menu.
2. Use or to select and press to access.
3. Use or to select Image Setup and press to access.
4. Use or to select Clock and Phase adjustment.

Clock (pixel frequency) adjusts the number of pixels scanned by one
Horizontal sweep. If the frequency is not correct, the screen shows vertical
Stripes and the picture does not have the correct width.

Phase adjusts the phase of the pixel clock signal. With a wrong phase
adjustment, the picture has horizontal disturbances in light picture.
5. When the image no longer looks distorted, save the Clock and Phase adjustments.
6. Press to leave the OSD menu.