Summary

One of Sony's last curved Trinitrons, released in 1999 and sold at least as late as 2001.

Manuals

• User Manual
• Service Manual
• BA-4 Chassis Repair Training Manual
• Specification Sheet

Mods & Repair Guides

• RGB Mod

Notes

Two other BA-4D models with this design were produced; the KV-27S46 and KV-27S66. These have a second A/V input and Picture-in-Picture.

The jungle chips used in BA-4 and BA-4D chassis Trinitrons are very versatile, and these TVs can be modified for RGB and/or Component video.

The TV in these photos was modified with a SCART input. Normally, it would just have set of A/V inputs, S-Video, and audio out.

Composite 240p Performance

by Eli Krause

For composite decoding this set uses the Sony CXD2073S, a 2-line digital comb filter used in many models from their 1997-1999 lines. As with all 2-line comb filters, the amount of dot artifacting added to 240p content is severe. If the set has an AA-2D chassis, then the set's own internal notch filter can be enabled in the service menu - NOTC 1, which will avoid the horizontal dot artifacts caused by the comb. If the set has a BA-4D chassis then there is no service menu option to enable the notch. But if the set has an s-video input (or if it has been modded for component input, or if one does not want to toggle a value in the service menu when switching to and from using composite), then using a good external notch filter to decode composite instead, and sending that to the set would properly blend all dithering patterns and avoid nearly all dot artifacts. Guide to using an external notch filter with a CRT is here.