# Toshiba 13A21+ CRT RGB mod
This mod should also work for the below models
- Toshiba 13A21
- Toshiba 13A22
This mod doesn't work for the below models. Below models use a single-chip. In the absence of OSD chip, RGB mod is not possible.
- Toshiba 13A23
- Toshiba 13A24
- Toshiba 13A25
# 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 13A21
- Manufactured: Made in Thailand, May 2001
- NTSC, 60 Hz
- Chassis: M3J88
- Tube: Orion A34AGT13X98
# 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.
Points where the R, G, B and Blank (brown) wires should be connected are marked "X". Pink boxes show the resistors that needs to be removed.
# Performing the mod
# STEP 1: Remove the following components
Remove the three 680 ohm, RGB resistors to ground
# STEP 2: Connect RGBs, Blanking and Audio
# 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.
|TV Model||1350P||RGB Mux Board Notes|
|RGB inline resistors||680Ω||R1, R2, R3|
|RGB termination||75Ω||R4, R5, R6|
|Audio LR||1kΩ||R7, R8 (1 kΩ resistor present on the board)|
|Blanking inline||4.7kΩ||R9 (CRT internal 4.7kΩ resistor for 2.5V)|
|Blanking ground||open||R10 (CRT internal grounding resistor is used)|
|Csync 75Ω||open||R12 (75Ω terminated in the CRT)|
# STEP 4: Attach the female SCART connector to TV
Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.
SCART connector mounted
# 13A21 Games
SNES - The Legend of Zelda A Link to the Past
SNES - Super Mario World
SEGA Genesis - Sonic
NES - 1942
# 13A21 Patterns
240p - Grid
# 13A22 Games
# 13A21 Random Pics
Back cover open