Toshiba 24AF43+

SuntharAbout 2 min

Toshiba 24AF43+ CRT RGB mod

This tutorial covers the RGB mod for the below models.

Toshiba 24AF43
Toshiba 24AF44
Toshiba 24AF45
Toshiba 24AF46

Please also see other Toshiba AF series mods, as the instructions are more or less the same.

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

Service manuals

Specs

24AF43

Chassis: M3M627
Manufactured: Thailand, April 2003
Power Consumption: 125W, 120V, 60Hz (NTSC)
Tube: Orion A60LVY196X11

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

PCB

Points where the R, G, B and Blank wires should be connected are marked "X". Pink boxes show the resistors, diodes that needs to be removed.

Actual PCB might be slightly different for your particular CRT. However, the mod that needs to be applied is in similar location. Below was taken from Toshiba 20AF44.

Performing the mod

STEP 1: Remove the following components

Remove the RGB resistors to ground

R141
R142
R143

Unplug the VM cable on the neck board.

STEP 2: Connect RGBs, Blanking and Audio

Connect the RED, GREEN, BLUE, BLANKING wires

Connect the SIGNAL, AUDIO RIGHT, AUDIO LEFT, GROUND wires

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.

Buy your RGB mux board

Depending on the RGB/OSD stock resistors your CRT has, use the below inline resistors.

TV Model	24AF4x	24AF4x	24AF4x
RGB/OSD stock resistors on chassis	3.3kΩ	3.9kΩ	6.8kΩ
RGB termination (R1, R2, R3)	75Ω	75Ω	75Ω
RGB inline resistors (R4, R5, R6)	470Ω	560Ω	1kΩ
Audio LR (R7, R8)	1kΩ	1kΩ	1kΩ
Diode (R9)	1N4148	1N4148	1N4148
Blanking Resistor (R11)	shorted	shorted	shorted

Only try alternate method, if there are ringing artifacts. Alternate method is a degree more complex.

Changes on CRT (Alternate method)	24AF44
CRT RGB/OSD stock inline resistors	3.3kΩ
3x RGB termination resistors removed	820Ω
3x RGB inline resistors on mux board (R4, R5, R6)	1kΩ
Remove 3x jumper and stock 0.1uF caps?	yes
3x add 0.1uF caps inline?	yes
3x 1N4148 diodes inline?	yes