Toshiba CF13E23 13" CRT RGB mod
This is a white Toshiba 13" set from the mid 90s. 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
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.
- 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
Get hold of the schematics for your TV. Understand where the RGB and Fast Blanking signals go from OSD to the Jungle (Chroma) chip.
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
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.
|On CRT Chassis
|RGB inline resistors
|RA22, RA23, RA24
|RR90, RR91, RR92 (removed from chassis)
|x4 diodes for RGB and blanking
|Replace blanking resistor?
|Replace 8.2k with 6.8k resistor
|RGB mux board
|RGB termination (R1, R2, R3)
|RGB inline resistors (R4, R5, R6)
|Audio LR (R7, R8)
|Blanking Resistor (R11)
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.
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
Recall on the remote and press
Menu on the CRT to enter Design Mode