Summary

The last of Sony's 20" CRT models, the 20FS120 is a follow-up to the 20FS100 and 20FV300. Introduced in 2004, it was produced until 2006 when Sony's consumer TVs were phased out (although several larger Sony CRTs were introduced in 2005 and 2006). It's mostly the same as the KV-20FS100, with the addition of a 16:9 mode.

Literature

• User Manual
• Service Manual
• BA-6 Chassis Repair Training Manual

Notes

Like the other BA-6 chassis Trinitrons, this TV uses a one-chip design and cannot be modified to accept RGB. However, its component video quality is excellent when the TV is properly set up.

Unlike the larger models, 20" and 13" Wega TVs typically have excellent geometry and linearity, even on side-scrolling 2D games.

A very late production variant (produced in 2006) omitted the circuitry for screen tilt and velocity modulation.

Disabling Velocity Modulation

Most of Sony's flat Trinitrons contain a velocity modulation circuit. VM enhances dark outlines on screen, which helps hide composite dot crawl and can make TV and movies look better. However, it ruins pixel art and significantly degrades the appearance of 2D games.

In this model, turning off VM in the user menu does not completely disable it. To address this problem, go to the service menu and set "VMOF" to zero.

Composite 240p Performance

by Eli Krause

For composite decoding this set uses a Renesas M65582AUF, a 3-line digital comb filter/unified jungle chip. The blending of dithering patterns is inconsistent, and the dot artifacting is severe on all consoles tested. Recommend using an external notch filter to decode composite instead (such as the notch filter in a RetroTink) and sending that to the set's component input to remove nearly all dot artifacts and blend all dithering patterns.