The cold VCC wire is in the wrong spot, it should be connected to pin 2 of IC401, this is the cold power supply for the optocoupler for the Composite video circuit.
For the Chroma connection from the chassis to the 4-pin connector on the hot side of the mod board: R326 should be lifted from the side connected to the Chroma pin (46) of IC301, then connect YCJ_IN to the jungle chip pin and TV_C to the R326 resistor lifted upward out of the original circuit, it is recommended to use heat shrink tubing to cover the resistor after soldering the wire to it to avoid the risk of shorting out near adjacent components.
Sony Trinitron S-Video/Composite Mod (RF-Only TV) SOLVED
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- Location: Seattle, WA, USA
Re: Sony Trinitron S-Video/Composite Mod (RF-Only TV) SOLVED
Thanks a lot for your comments! And also for creating this isolation board!