CRT:RGB Video Modifications

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Revision as of 19:24, 21 January 2022 by Derf (talk | contribs) (Created page with " == Methods == There are five main methods to add RGB to a set. === Method 1: OSD Switching === This method is probably the most common RGB mod. It is only possible on sets...")
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Methods

There are five main methods to add RGB to a set.

Method 1: OSD Switching

This method is probably the most common RGB mod. It is only possible on sets where the Jungle IC has analog RGB inputs for the on-screen display (OSD). Basically, you inject your RGB signals into these pins and wire a physical switch to the blanking pin so that the entire screen is displayed instead of the OSD menu. The switch allows you to "turn off" the mod, so that the OSD menu can still be used.

Method 2: OSD Mux

This method requires a custom circuit that multiplexes (muxes) your RGB signal and the OSD signal together so that both can be used at the same time without having to install a physical switch. It is only possible on sets where the Jungle IC has analog RGB inputs for the on-screen display (OSD).

Method 3: Picture-in-Picture (PIP)

This method is similar to the OSD switching method. You inject your RGB signals into the PIP pins so it displays your image instead of the PIP and then wire a physical switch to the blanking pins so that the PIP image fills the entire screen. The switch allows you to "turn off" the mod, so that the PIP feature can still be used if you wanted.

  • Some displays may have a setting to make the PIP full screen and therefore not require a physical switch.

Method 4: Unused RGB Input Switching

This method involves using unused RGB input pins on your Jungle IC and a switch wired to a select pin to use them. It is only possible on sets where the Jungle IC has unused analog RGB inputs and a select pin. While some sets this is directly possible, some (if not all) Sony and JVC sets disable the unused signals digitally by setting the RGB SEL register in the Jungle IC which disable the ability to select the unused lines. This can be defeated by intercepting the commands with a microprocessor [1][2][3], but it is a complex modification and may be different for each set.

Method 5: Neckboard Injection

Specific Models

JVC

Panasonic

RCA

  • RCA F32685 - Needs resistors (e.g. 1k trimmer pots) on colour lines.

Samsung

Sony

Toshiba