Toshiba CF13E23

SuntharAbout 3 min

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

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

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

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

CF13F22 Service Manualopen in new window

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.

Schematics

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 Chassis	CF13E23	Notes
RGB inline resistors	4.7kΩ	RA22, RA23, RA24
Ground resistors	1.2kΩ	RR90, RR91, RR92 (removed from chassis)
Inline diodes?	Yes	x4 diodes for RGB and blanking
Replace blanking resistor?	Yes	Replace 8.2k with 6.8k resistor