Toshiba 14AF42
Toshiba 14AF42 CRT RGB mod
This tutorial covers the RGB mod for the below models
- Toshiba 14AF42
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.
Specs
Service manuals
Schematics
Get hold of the schematics for your TV. Understand where the RGB and Fast Blanking signals go from OSD to the Jungle (Chroma) chip.
If you are building your own circuit, this diagram should help 
Performing the mod
STEP 1: Remove the following components
RGB resistors to the ground
- R141
- R142
- R143
STEP 2: Connect RGBs, Blanking and Audio
STEP 3: 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.
Depending on the RGB/OSD stock resistors your CRT has, use the below inline resistors.
| TV Model | 14AF42 |
|---|---|
| RGB/OSD stock resistors | 4.7kΩ |
| In line diode method | Yes (3) |
| Audio LR (R7, R8) | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω |
| RGB inline resistors (R4, R5, R6) | 1kΩ |
| Diode (R9) | 1N4148 |
| Blanking Resistor (R11) | shorted |
Sample Toshiba 20AF44 RGB Mux Adapter 
STEP 4: Attach the female SCART connector to TV
Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.