N64 RGB mod help

[scarmullet]

I am working on an N64 RGB mod using the THS7314 chip as an amp. I am not using SCART, but I am using a custom cable I built for my SNES, so that I can use it with my CGA to VGA adapter, (the one found in the DIY scaler kit). There is a problem, the image is too bright for my tastes, so bright it washes out the image of any detail.

I think the culprit may be the 220uF caps I have on my custom cable. What do you think?

[scarmullet]

Sorry for the double post, but here is a better example from Super Mario 64 that shows how bad the image is washed out.

[ApolloBoy]

Do you have 75 ohm resistors on the output pins on the THS7314?

[scarmullet]

I do have 75 ohm resistors on the AMP.

[unshe]

Your machine was already RGB modded?

[unshe]

If yes, it is possible that you got a internal booster tweak to burst a little the rgb output.
check in this page: http://www.eurasia.nu/wiki/index.php/N64RgbBooster
look at the bottom of the page.
If there, remove it.

For the THS7314 amp the 220micro farad are perfect.

[scarmullet]

I did the RGB mod myself.

[unshe]

mmm...
Did you respect the polarity of the caps?

[unshe]

this is what i did, maybe it can help you....

[scarmullet]

Yes. I am using the same cable I made for my SNES to pull RGB off it, and thats fine. Positive towards console.

I had initially soldered the RGB lines right to the chip, I moved them to the bottom holes and then touched up the pins on the chip, that way they make a solid connection, and it helped a little bit, but after a while video blinked out of the system, Composite, S-Video, and RGB...gone.

[scarmullet]

this is what i did, maybe it can help you....

the wire joining 7 and 9, is that for a proper Cync instead of C-Sync?

[unshe]

This board is REV-04, so no proper CSync in pin3.
I'm using Y "Luma" as source of Sync instead of CVBS (composite-video). This help whit LCDs for better quality.

The Blue wire give 12V to pin 3. So i use a gamecube Pal cable.

[unshe]

Yes. I am using the same cable I made for my SNES to pull RGB off it, and thats fine. Positive towards console.

I had initially soldered the RGB lines right to the chip, I moved them to the bottom holes and then touched up the pins on the chip, that way they make a solid connection, and it helped a little bit, but after a while video blinked out of the system, Composite, S-Video, and RGB...gone.

Are you still hearing sound?

[scarmullet]

Yes I am.

[unshe]

check the pin of VDC-nus you restored.
Try removing all the ampli mod e check if Videocomposite is still working.

[scarmullet]

check the pin of VDC-nus you restored.
Try removing all the ampli mod e check if Videocomposite is still working.

I tried and broke off pins on the VDC...I assume it is dead.

[unshe]

Not good.
Can you make a very good picture of the VDC?

[scarmullet]

Not really, the board is scorched under the top two pins on the right side.

[unshe]

If you want you can send me the machine, i will try to fix. Of course for free....

[scarmullet]

Nah thats fine. All I need is a new VDC chip, right? Desolder, clean up the pads, solder new one on, wham bam, thank you ma'am

[unshe]

Good luck!