Sony BA-4D 20" Chassis RGB Mod via OSD Mux

Written by Andy King

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