Cathode ray tubes, or CRTs, are the projection devices that shine images on the back of your rear projection set's screen. These tubes become misaligned over time, due to normal vibration. Occasionally it is necessary to balance these CRTs, restoring clarity to the image and removing color fringing. This process is designed for the owner of the set to perform, using the television's remote control.
Press the "Menu" or "Setup" button on the television's remote control.
Look for the "Convergence" option in the setup menu. Cycle to this option, using the directional keys in the middle of the television's remote.
Highlight the "Convergence" option. Click "OK" or "Enter" to select. Look for the crosshatch grid to appear on-screen.
Inspect the grid for color fringing. This appears as separate red, white and blue lines where there should only be white. A perfectly aligned rear projection convergence grid only displays white lines, devoid of any other colors.
Move the flashing cursor to intersections on the grid where color fringing is observed. Start your adjustments at the center of the screen, moving outwards. Press the "OK" or "Enter" button to lock the cursor in place. The color of the cursor indicates the CRT color you are about to align.
Move the directional buttons up, down, left and right to align the CRT color with the white reference line. Press the appropriate button on the remote to switch to the blue or red CRT, repeating the alignment process as needed.
Press the "Menu, "Setup" or "Exit" button to save your changes and exit the menu.
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