Toshiba 20A22
Toshiba 20A22 CRT RGB mod
The Toshiba 20A22 is a 20" CRT display that can be easily modified for RGB input. Although it carries the Toshiba name, it was actually manufactured by Orion.
I find this CRT more visually appealing than Toshiba 20A42.
View full CRT details and more mod examples →
Contributors
Thank you to everyone who contributed to this guide:
- Retro Tech's Sector — author, RGB mod and YouTube video
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
Manuals and Datasheets
Specs
- Year: 2002
- Jungle Chip: Renesas M61250FP
- OSD Chip: Orion OEC7072A
- Screen Size: 20"
RGB mux diagram
Prepare the mux diagram. If you are building your own circuit, this diagram should help.
This 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 mux calculator to play with your own values.
| On Toshiba CRT Chassis | 20A22 |
|---|---|
| CRT RGB inline resistor | 4.7kΩ |
| CRT RGB ground resistors removed | 680Ω |
| 0.1μF caps replaced | No |
| Add diodes on chassis RGB lines? | No |
| Add blanking diode on chassis | No |
| RGB mux board | 20A22 |
|---|---|
| Mux board RGB termination (R1, R2, R3) | 75Ω |
| Mux board RGB inline resistors (R4, R5, R6) | 680Ω |
| Mux board Audio LR (R7, R8) | 1kΩ |
| Mux board blanking diode (R9) | 1N4148 |
| Mux board blanking ground resistor (R10) | open |
| Mux board blanking resistor (R11) | 4.7kΩ |
Compatible mux boards:
Performing the mod
1.4B mux board works well on this set and highly recommended.
Pictures
Reference Photos
