Sony KV (AA-2D)
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 mod was performed on a Sony KV-27V20 and Sony KV-27S22.
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
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.
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)
Step 2: Add a diode to blanking
Blanking diode added. Helps reduce interference. This mod was performed without shielded cables internally and absolutely no interference was noticed.
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.
|Audio LR (R7, R8)||1kΩ||1kΩ|
|RGB termination (R1, R2, R3)||75Ω||75Ω|
|RGB inline resistors (R4, R5, R6)||330Ω||330Ω|
|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