RCA F27442

# RCA F27442 RGB mod (work in progress)

This RGB mod is a work in progress. Do not follow this tutorial until it is finalized.

# CRT safety

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

# Specs

• Chassis: CTC203AD5
• Chroma: LA7612N

# Service manuals

• RCA F27422 Service Manual

# Schematics

Prepare the mux diagram. If you are building your own circuit, this diagram should help

# Performing the mod

Now that you roughly know what needs to be done, prepare for the mod. Place the board on a comfortable place. Make sure you are not putting pressure on the flyback or other components.

# STEP 1: Remove the following components

Remove the following RGB resistors that are connected to the ground.

• R13313 (1kΩ)
• R13312 (1kΩ)
• R13311 (1kΩ)

# STEP 2: Add inline diodes to reduce interference

Let's skip this step for now

# STEP 3: Connect RGB and Blanking

Attach RGB wires and blanking on exactly where these resistors were removed.

# STEP 4: Connect Audio, Sync and Ground

Composite Sync, Audio and Ground wires should be connected.

# STEP 5: Build your mux board/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.

Buy your RGB mux board

Buy your RGB mux board