Sony KV (AA-2D) 32S66
Sony AA-2D chassis CRT RGB mod
If you're looking to get the most out of your Sony Trinitron, you may want to consider modding it for RGB output. This guide will show you how to do just that.
Below RGB mod was performed on a KV-32S66
This tutorial is also applicable for the below models:
- Sony KV-32S42
- Sony KV-32S66
- Sony KV-32V42
- Sony KV-35S42
- Sony KV-35S66
- Sony KV-35V42
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
Schematics
Mux diagram
If you are building your own circuit, this diagram should help. The diagram is for KV-27V20, it will also work for other AA-2D chassis based Sony CRTs.
Step 1: Remove the following components
Remove R1123, R1128 and R133 
Inject R, G, B at the below locations R1123 (Red) R1128 (Green) R133 (Blue)
Disconnect VM wires to reduce artificial sharpening.
Step 2: Add a diode to blanking
Blanking diode was not added in this mod. But, it can be added by replacing JW801. This is known to help reduce interference. However, first try the mod without this diode.
With diodes, direction matters. Please make sure to install it such that the stripe is pointing towards the chroma/jungle chip. The idea here is to make sure external blanking current doesn't reach the OSD chip.
Step 3: Connect RGB and blanking wires
Step 4: Connect audio and sync wires
Step 5: Build your mux circuit
Below mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the precalculated resistor values.
| TV Model | KV-27V20 | KV-32S66 |
|---|---|---|
| Audio LR (R7, R8) | 1kΩ | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω | 75Ω |
| RGB inline resistors (R4, R5, R6) | 330Ω | 330Ω |
| Diode (R9) | 1N4148 | 1N4148 |
| Blanking Resistor (R11) | 1kΩ | 1kΩ |
| Blanking Ground Resistor (R10) optional | 6.8kΩ | 6.8kΩ |
| Add diodes to RGB lines | No | No |
It is important to note that the blanking ground resistor (R10) is necessary to prevent strange black backgrounds from appearing on the KV-27S22 OSD text.
Picture of RGB mux rev B board 
STEP 6: Attach the female SCART connector to TV
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
Games
Mux mod in action 
SNES - Super Mario World 
TV
Front 
Back 
Back open 
Chroma 
Chassis assembly 
AV board 
Inside view 
Neck board 