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Sony KV (AA-2D)

SuntharAbout 2 minCRT RGB mod

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.

Sony KV-27V20 img

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.

READ THIS BEFORE CONTINUING

Plan of attack

READ THIS TO PREPARE

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.

READ THE RGB MODDING THEORY

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.

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Step 1: Remove the following components

Remove R1123, R1128 and R133 img

Inject R, G, B at the below locations R1123 (Red) R1128 (Green) R133 (Blue)

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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.

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Step 3: Connect RGB and blanking wires

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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.

Buy your RGB mux board

TV ModelKV-27V20KV-27S22
Audio LR (R7, R8)1kΩ1kΩ
RGB termination (R1, R2, R3)75Ω75Ω
RGB inline resistors (R4, R5, R6)330Ω330Ω
Diode (R9)1N41481N4148
Blanking Resistor (R11)1kΩ1kΩ
Blanking Ground Resistor (R10) optional6.8kΩ6.8kΩ
Add diodes to RGB linesNoNo

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 img

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