Toshiba 13A21+
Toshiba 13A21+, 19A21 CRT RGB mod
This mod should also work for the below models
- Toshiba 13A21
- Toshiba 13A22
- Toshiba 19A21
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
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.
Plan of attack
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.
Specs
Toshiba 13A21
- Manufactured: Made in Thailand, May 2001
- NTSC, 60 Hz
- Chassis: M3J88
- Tube: Orion A34AGT13X98
- Chroma Chip: M61206FP
- OSD Chip: OEC7063A
Memorex MT1132A
- NTSC, 120V 60 Hz, 54W
- Chassis: TMX494A/B
- Tube: Orion A34AGT13X98 or A34JXV70X53N45
- Chroma Chip: M61206FP
- OSD Chip: OEC7045B
Memorex MT1192A
- NTSC, 120V 60 Hz, 73W
- Chroma Chip: M61206FP
- OSD Chip: OEC7045B
Service manuals
- 13A21 Service Manual
- 13A22 Service Manual
- M61206FP Mitsubishi Datasheet - Chroma Chip
- Memorex MT1132A/MT1192A Service Manual
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.
13A21
13A22
PCB
Points where the R, G, B and Blanking (brown) wires should be connected are marked "X". Pink boxes show the resistors that needs to be removed.
13A21
13A22
Performing the mod
STEP 1: Remove the following components
Remove the three 680 ohm, RGB resistors to ground
- R102
- R103
- R104
STEP 2: Connect RGBs, Blanking and Audio
13A21 
13A21 
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 | 13A21 | RGB Mux Board Notes |
|---|---|---|
| RGB termination | 75Ω | R1, R2, R3 |
| RGB inline resistors | 680Ω | R4, R5, R6 |
| Audio LR | 1kΩ | R7, R8 (1 kΩ resistor present on the board) |
| Blanking inline | 1N4148 | R9 (CRT internal 4.7kΩ resistor for 2.5V) |
| Blanking ground | open | R10 (CRT internal grounding resistor is used) |
| Diode | 4.7kΩ | R11 |
Back 
SCART connector 
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 
How to create and mount a SCART female plug?
Pictures
13A21 OSD overlay
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 
13A21 Random Pics
Back cover open 
13A22 Games
