Sony KV (BA-1) 13TR28
Sony BA-1 chassis CRT RGB mod
Bring your Sony CRT to life with vibrant RGB colors! Below mod was performed on KV-13TR28.
This tutorial should also cover the RGB mod for the below models with the BA-1 chassis. However, there might be slight differences.
13" models
- KV-13TR28 (black casing)
- KV-13TR29 (white casing)
- KV-13V50
CRT safety
Caution
You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.
Plan of attack
Theory
Sometimes it is nice to know the theory behind the mod. I have put this on a separate page. This shows how the various resistor values are calculated.
Service manuals
Specs
Sony KV-13TR28
- Manufactured: April 1994, Mexico
- NTSC, 60 Hz
- Chassis: BA-1
- Tube: A34JBU70X
- Jungle Chip: CXA1465AS
Schematics
Red is shown for reference. Blanking (Ys), Red, Green, Blue lines are exposed on 5, 6, 7, 8 of the CN101 connector.
Performing the mod
You can't ask for a more straightforward RGB mod.
Fortunately this chassis doesn't require any muxing. You can pass R, G, B through a 0.1uF, 75ohm terminated wire directly to the CN101 header. Blanking (Ys) can be fed through a 1kΩ + 0.7V didoe to pin 5 of the CN101 header.
STEP 1: Remove Closed Captioning Decorder board
The Closed Captioning Decoder board (the "S" board) has to be removed prior to the modification on the United States version of this set (and other Sony BA-1 chassis sets).
In the service menu, the ID-2 setting was changed from "64" to "0" to disable Closed Captioning after performing the mod.
STEP 2: Connect RGB, Blanking and Ground
See picture to see where blanking, R, G, B should be connected. Blanking (Ys), Red, Green, Blue lines are exposed on 5, 6, 7, 8 of the CN101 connector.
STEP 3: Connect Audio and Sync
Since this set only supports mono audio, the Audio Left (white) and Right wires (grey) were twisted together and soldered onto the "V1 L-IN" pad on the mainboard.
- V1 V-IN for SYNC
- V1 L-IN for Left and Right Audio
- E for GROUND
Below photo taken from Sony KV-13TR29, shows a JST connector placed on the appropriate spot for a header on the chassis. 
STEP 4: Build your mux board (optional)
Below mod uses the RGB mux board. However, it is optional for BA-1 chassis. Using the mux board makes the mod neater and easier. Please note for this mod, 0.1uF caps were used in place of R4, R5, R6 resistors.
Buy your RGB mux board with the necessary parts to complete this mod
| TV Model | KV-20TS29 | KV-13TR28 |
|---|---|---|
| Audio LR (R7, R8) | 1kΩ | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω | 75Ω |
| RGB inline caps (R4, R5, R6) | 0.1uF | 0.1uF |
| Diode (R9) | 1N4148 | 1N4148 |
| Blanking Resistor (R11) | 1kΩ | 1kΩ |
Caps were used instead of resistors.
Buy your RGB mux board with the necessary parts to complete this mod
STEP 5: Attach the female SCART connector to TV
There is a sticker at the back that made it very difficult to cut the SCART port. Cutting this port is probably most complex part of this mod.
Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.
How to create and mount a SCART female plug?
Pictures of the mod
Games
Patterns
