PSone Screen Video Adjusting (Changing RGB levels, etc.)

[Mario]

I was doing the brightness mod on a new PSone screen and I remember Ben's comment about how he found out about it. So I started poking around, jumping all the capacitors and seeing what they would do to the picture. Here are my findings. These things are what happen when you jump a certain component: (Only the capacitors, jumping resistors could be bad)

These are the capacitors:
The line of white text on the top row applies to all the components in that row, so the component right above the CV23 text is not actually CV23, it is CV30. The one on the far left is CV23. Please keep this in mind.


Here are my notes: (What happens when these components are jumped)
The list starts at the top-left component and goes clockwise. It is not numerical.
One more note; these components are the small, rectangular tan-colored ones. I /think/ they're capacitors.

CV23 - Blank Screen, still have audio

CV24 - Slight increase in color saturation, barely noticable

CV31 - Makes the picture VERY dark, you can hardly see it

CV30 - Screen gets a lot brighter, brightness control?

CV21 - Creates a weird color tint; pink becomes orange, green becomes purple

CV28 - Picture becomes black and white. Maybe luma control?


CV29 - Same as CV28

CV27 - Same as CV28

CV26 - Same as CV28

CV25 - Colors become very saturated. Probably chroma control.


CV35 - Screen just gets dark

CV36 - Same as CV35

CV34 - Same as CV23

CV33 - Inverse black and white, slight increase in brightness. Possibly contrast?

CV42 - Screen is very dark, mostly B&W. Anything moving is checkboard. Very strange.


CV41 - Screen gets sky blue tint, red level control?


CV40 - Screen gets magenta tint, green level control? (Doesn't look magenta in the picture, but trust me, it is)


CV39 - Screen gets yellow tint, blue level control?


CV20 - Same as CV39

CV19 - Same as CV40

CV18 - Same as CV41

CV17 - Blank screen

CV16 - DO NOT JUMP!! The screen gets white lines coming from the top of the screen, and a bad smell is created. No audio or video. Could possibly fry your screen.

CV15 - Same as CV16


That's it; those are my notes. Now, the question is, how do we make them adjustable? I think if we used 2M variable resistors we could do it, but can anyone confirm this? These observations are useless if they can't be adjusted, only jumped.

It'll be great if we can get this working. I'd like my picture to have a little more saturation. It'd be cool if you could adjust the RGB levels, too.

[Ben Cebhrem]

Now, the question is, how do we make them adjustable? I think if we used 2M variable resistors we could do it, but can anyone confirm this? These observations are useless if they can't be adjusted, only jumped.

It'll be great if we can get this working. I'd like my picture to have a little more saturation. It'd be cool if you could adjust the RGB levels, too.

I'm not entirely sure that would work. Perhaps a trimmable capacitor would be better as a replacement, seeing as how you are bypassing capacitors that are already in place?

[Mario]

Maybe... It would have to be a really small value, though. These are .1uf caps.

[Ben Cebhrem]

Oooh, ouch. I don't think a trimmable cap gets that small. If it does (I'm new to the idea of trimmable caps, sorry), I don't imagine it'd be too easy to find.

Maybe then, yeah, a pot would be the best idea.