So I just finished up RGB modding my Sony Trinitron 27FS100 the other day and everything is mostly good. There's a slight horizontal shift to the left as some people have noticed. Not too bad when using CSYNC on composite or luma input, or when using CVBS on luma input (though at least double the shift when using CVBS on the composite input). This isn't too big of a deal since I should be able to go into the service menu to adjust.
The main issue I've noticed is solid black areas of the screen have some kind of jittery scrolling horizontal interference lines. Now granted they're very slight and I can't really notice them from a normal sitting distance, but it's one of those things when you're up close testing, you see it then you can't unsee it
. It's not there on built in inputs such as composite or s-video.
At first I assumed it might be the fact that I've shoved a bunch of new mostly loose wires into the TV and they must be getting close to something causing them to pick up interference, but when I flip the switch back to the OSD, navigate around in it, and do the demo with lots of black then it's not visible there despite the OSD wires being routed around inside to go to the switch. I can see the OSD ghost online in RGB when I bring it up, but i'm not sure if that would be causing this.
Has anybody else noticed this, especially on a 27FS100 since I've seen at least one other person in this thread do the mod on that model. should be fairly apparent when looking for it on a solid black screen when about a foot away from the TV
(before anyone asks I terminated RGB to ground via 75 ohm resistors, then put 0.1 uF caps inline on R, G, and B)
EDIT: Actually, I have a theory about the interference lines now. Since they're not there on the OSD signal despite it now traveling through all the extra wire now inside the CRT for this mod as well, I'm suspicious that the blanking pin on the jungle IC is the focus point. It seemed like a good portion of people here were just feeding the pin 5V from the console via the SCART connector, and I never saw them mention any inteference related issues. I'm not using SCART so I just grabbed 5V off the same PCB in the TV as the Jungle IC, right after a pin header that had it. I sent this straight to the switch (with no additional components) which then sends it straight to the blanking pin on the Jungle IC when RGB is selected. I'm wondering if maybe the 5V it has is noisy, thus causing the interference in black on the blanking signal.
I'll probably open it back up in a few days and feed it 5V (well, more like 4.5V) from 3 AA batteries to see if that gets rid of the intereference. If it does, then I'll need to figure out a way to filter the 5V from the TV that I'm using.