Summary

Basic 20" Trinitron, with mono audio and two A/V inputs. The example in the images below has been RGB modded.

Manuals

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

Notes

This TV was also sold in a stereo version (KV-20S42). A higher end model with the same chassis, the KV-20V80, had side mounted speakers and S-Video input.

The jungle chips used in BA-4 and BA-4D chassis Trinitrons are very versatile. As such, these TVs can be modified for RGB, Component video, and S-Video inputs. When modified, picture quality on these TVs is exceptionally sharp.

RGB Mod

The RGB modding process for this model is the same as the 27" models with a few slight differences:

• the resistor locations are visually similar, its just the numbers are different.
• the spot for blanking is slightly different too (and I provided an alternative switchless blanking solution if you want).
• This chassis does not have a horizontal position switch (so you'll have to deal with composite being off-center after you calibrate via service menu for RGB input centering)

Below are some pictures of how I modded this one for reference:

• OSD resistors removed:

• Standard wiring with switched blanking injection:

• Alternative wiring with switchless blanking injection (5v injected via 1K resistor from input switching TTL line. Use front "Video 2" composite jack for injecting sync if you follow this wiring)

• Marking the holes for BNC jacks (use standard grid paper, 2x2 box for each jack and 1x1 gap between each jack)

• BNC Jack wiring

• Finished result