Toshiba 27AF43+

# Toshiba 27AF43+ CRT RGB mod

This tutorial covers the RGB mod for the below models.

• Toshiba 27AF43
• Toshiba 27AF44
• Toshiba 27AF45
• Toshiba 27AF46

NES Adventure Island

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

• Toshiba 14AF43
• Toshiba 20AF43
• Toshiba 24AF43

# 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

# Service manuals

• 27AF43 Service Manual
• 27AF44 Service Manual
• 27AF45 Service Manual
• 27AF46 Service Manual

# Specs

• Tube: Orion A68QCU770X66

# 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. Highly recommended to use the ringing noise reducing circuitry by adding diodes to the R, G, B lines.

# 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.

# Performing the mod

# STEP 1: Remove the following components

# 27AF43

Remove RGB resistors to ground

• R141
• R142
• R143

Remove inline caps and short them

• C136
• C137
• C138

Remove jumpers

• W107
• W108
• W112

# STEP 2: Connect RGB and blanking wires

Replace the jumpers, W107, W108, W112 with diodes and 0.1uF capacitor as per below image. This will help reduce RGB signal noise.

Pay attention to the orientation of the diode and where it is placed. RGB mod will fail if correct orientation and placement is not followed.

Connect the R, G, B and blanking wires as per below picture.

• Brown wire = blank
• Red wire = red
• Blue wire = blue
• Green wire = green
• Yellow wire = csync
• Organge wire = auxillary
• Grey wire = audio right
• White wire = audio left
• Purple = auxillary
• Black = common ground

# STEP 3: Connect Sync, Audio and Ground wire

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

# STEP 4: Prepare your RGB 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

M61283FP can handle a peak to peak voltage of 0.7 in the external RGB lines.

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

Sample Toshiba 20AF44 RGB Mux Adapter

# STEP 5: Attach the female SCART connector to TV

Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.

How to create and mount a SCART female plug?

# Pictures

# Patterns

240p SMPTE

240p Monoscope

240p Grid

# Set

Yoke Board

Tube

Back View/Neck board Board

# Capacitor list

• C407, C406, C409, C403 are capacitors that must be replaced
• C523, C408 are good capacitors (105C) and no need to replace

• C916, C905, C904 (put these caps at the bottom, if you want to install an XRGB mini adapter)

# Capacitor codes and references

# Service Menu