*The THX Optimizer test signals displayed are for reference use only. Be sure to check your equipment’s operations manual or refer to your service technician before making any internal adjustments on your monitor.
The 4:3 aspect ratio circle and boxes will determine your video monitor’s alignment for a 4:3 aspect ratio display.
For 4:3 television sets: You should be able to see two rectangles and a perfect circle centered horizontally and vertically on your screen. This test can indicate a misaligned deflection coil as well. If your monitor displays the test pattern off to one side, this would indicate an improper centering adjustment. If you can not see the outer rectangle, the monitor is not sized properly to the point where you actually are missing parts of the picture. You will also be able to determine the areas of your monitor where the display is not consistent — the lines of the rectangle should be perfectly straight while the circle should be perfectly round. Wavy lines or squeezing of the circle indicate problems with the display.
Using the 4:3 signal for 16:9 television sets: The 4:3 circle test should normally be used first to align your monitor’s horizontal and vertical sizing before setting the 16:9 aspect ratio sizing. In most consumer monitors, the 16:9 sizing controls are switched in-line with the 4:3 controls, making the adjustment interactive between the two modes; the 4:3 settings affect the display of the 16:9 setting, and vice versa. For this test, set your monitor to 4:3 mode. You should see two rectangles and a perfect circle centered horizontally and vertically on your screen. This test will tell you if your monitor displays the 4:3 mode properly centered. As in the previous test, you will be able to determine the areas of your monitor where the display is not consistent — the rectangle’s lines should be perfectly straight while the circle should be perfectly round. Wavy lines or squeezing of the circle indicate problems with the display.
Check with your service technician before attempting to make any adjustments on you home theater equipment. Although you can’t fix any existing display errors without the help of a service technician, it is important to provide enough information to the service technician so they may arrive prepared.