In every CRT monitor or TV I have taken apart, there was this odd inductor that has a permanent magnet glued to it. Is that to offset the magnetic field generated by a DC bias current so a cheaper core can be used?
These are used for corner deflection correction magnets controlled by the CRT controller with front panel display. Use Dead Pixel Tester (free)
dpt.exe to test all,Monitors for alignment and for LCD's useful for pixel sync testing (alternate black whiTe pixel pattern is the best pattern ) and Gamma Correction test patterns with gradient colours. Use Monitor correction to make a picture perfect calibration. Pin corner correction?
Also There are also ,Common Mode CM, chokes to suppress EMI from the video RGB 50 Ohm signals on VGA cables which carry pixel clock analog DAC rates. DAC clock rate = number of pixels on screen * refresh rate e.g. 1920*1080*60Hz > 120MHz. They are either snap clamped or molded plastic 2 split C ferrite cores.