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Toshiba CF13E23

Toshiba CF13E23

SuntharAbout 3 minCRT RGB mod

Toshiba CF13E23 13" CRT RGB mod

This is a white Toshiba 13" set from the mid 90s. It is a cute looking model to modify. In this tutorial, we are going to explore RGB modding it.


Mod should also work for the below models.

  • Toshiba CF13F22
  • Toshiba CF19F22

This mod is also very similar to Toshiba CF19G32

CRT safety


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



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.



Toshiba CF13E23

  • Manufactured: Made in Thailand, May 2001
  • NTSC, 60 Hz - 0.8 AMPS, 43 WATTS
  • Chassis: CF13E23 (TAC 9501)
  • Tube: Toshiba A34KQV42X
  • OSD Chip: TMP87CM34BN-3298
  • Jungle Chip: TA1223N

Service manuals


Get hold of the schematics for your TV. Understand where the RGB and Fast Blanking signals go from OSD to the Jungle (Chroma) chip.

img Schematics

img Mux Diagram

Performing the mod

We are going to focus in the below three areas first - A, B and C.


STEP 1: Cut traces and install diodes (Area A)

Cut traces as seen below. This allows us to install diodes in vias that already exist on this chassis.


See Area A. We are going to install RGB inline diodes (1N4148) on the component side of the board where we cut the traces. Pay attention to the direction of the diodes. This will prevent the current from going into the OSD, creating a reflection in signal, that causes interference.


STEP 2: Remove the following resistors (Area B)

Remove the three 1.2 kΩ, RGB resistors to ground

  • RR90
  • RR91
  • RR92


STEP 4: Install an inline diode for blanking (Area C)

This is an important step to remove interference. On 13" sets, this interference is barely noticeable. On 19" sets, you can in most cases see this interference.


Pay attention to the direction of the diode stripe. Stock 8.2 kΩ resistor was replaced with 6.8 kΩ resistor.

STEP 5: Connect RGB, blanking and ground

There are convenient vias where the R (red), G (green), B (blue), Blanking (brown) and Ground (black) wires should be connected.


STEP 6: Hook up sync and Audio


Purple and orange wires in the latest 1.2B/1.2C boards are auxillary. You can leave them disconnected.

STEP 7: 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.

I had to use a RGB tuner gadget I made to find the right balance for RGB termination. It was found using a 150Ω to 180Ω resistor gave the best vibrancy of colors.

Buy your RGB mux board

On CRT ChassisCF13E23Notes
RGB inline resistors4.7kΩRA22, RA23, RA24
Ground resistors1.2kΩRR90, RR91, RR92 (removed from chassis)
Inline diodes?Yesx4 diodes for RGB and blanking
Replace blanking resistor?YesReplace 8.2k with 6.8k resistor
RGB mux boardCF13E23
RGB termination (R1, R2, R3)180Ω
RGB inline resistors (R4, R5, R6)1.2kΩ
Audio LR (R7, R8)1kΩ
Diode (R9)1N4148
Blanking Resistor (R11)6.8kΩ

Note: R4, R5 and R6 can also be 1kΩ. 180Ω is used to spice up the RGB signal. 75Ω should just work fine.




Buy your RGB mux board



STEP 6: 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?


OSD Overlay



NES - Adventure Island img

SNES - Mega Man X img

SNES - Yoshi's Island img

SNES - Yoshi's Island (Close up) img

SNES - Super Mario World (Close up) img

Sega Genesis - Sonic img

Playstation - Boot img


240p - Monoscope img

240p - RGB img

240p - SMPTE img

240p - Convergence img


Chassis img

Chassis Back img

Flyback img

Tube img

Label img

Label img

Neckboard img

Service Menu

Press Mute on the remote. Press Mute again on the remote and keep pressing. Press Menu on the CRT to enter Service Mode

Press Menu again on the CRT for options. CH buttons to change option. VOL buttons to increase/decrease values

Design mode

Press Recall on the remote and press Menu on the CRT to enter Design Mode

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