Bud's N64 Trimming Guide

Re: How to trim a Rev3-4 nearly as small as a Rev5-9

My only guess would be the cut U8 traces. I think the whole removing the U8 and bridging on the PIF just tricks the system into thinking the U8 is still there.
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

Hrm, I'll try reconnecting those few U8 traces then. I don't absolutely need the room cutting that close to the expansion port, but it'd be nice to have the extra breathing room.
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

I've personally found trimming in front of the slot to be finicky. It's always been easier to trim down the cart slot area and do a half RCP or something like that. I've cut down to the very last row of cart slot contacts and trace soldered the rest of the connections. A lot easier that wiring to the chips in my opinion.
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

What bud said. I would defo say its the cut connections to the U8. I had the same prob on a PAL board a while back. Reattached the cut connections and the board worked fine.
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

Here you go, Ashen. This is the compilation of hundreds of hours of work, but there a mistakes. Lemme know if you have questions.
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

So, I got the board I posted previously working through some trial and error on another board. ( I haven't thoroughly looked through Beta's diagram yet, he may already have noted this.)

Ends up, all it was is a 2k pull up resistor on pin 8 of the PIF that connects to 3.3v. ;)

dbb16796-1.jpg

So yea, PIF pin 8 --> 2k resistor --> 3.3v

Now... Time to RCP

EDIT: oh yea, also I removed the U8, board still works, controller still works. ;)
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

Ashen said:
So, I got the board I posted previously working through some trial and error on another board. ( I haven't thoroughly looked through Beta's diagram yet, he may already have noted this.)

Ends up, all it was is a 2k pull up resistor on pin 8 of the PIF that connects to 3.3v. ;)

dbb16796-1.jpg

So yea, PIF pin 8 --> 2k resistor --> 3.3v
Added this info to the first post.

The two times I did this trim I never had to do any of that. I assume I just got lucky. :p Except for the time I knocked off a smd cap and all of the video was in black and white :neutral2:
 
Re: How to trim a Rev3-4 nearly as small as a Rev5-9

Maybe lucky ;)

Rev 3's may be different I dunno, I have around 10 rev 4's here and 1 rev 8 and 1 rev 9, so I can't tell as I don't have a rev 3 to compare to.

On a rev 4 it really depends on how close to the PIF you cut. If you stay 4-5mm away from the actual side of the chip you wont remove the resistor from the bottom of the board and will be fine.
 
Can someone help me with this? :) I have already cut the motherboard, but I'm a total n00b, so I'm a little confused about what to wire. Any help is appreciated! Thanks in advance :)
 
Spiicyice said:
Can someone help me with this? :) I have already cut the motherboard, but I'm a total n00b, so I'm a little confused about what to wire. Any help is appreciated! Thanks in advance :)
How do you need help exactly? Everything you need to wire is labeled in the diagrams
 
I get where to wire the audio and video. I'm just a little confused about the power. I'm a little confused about what to do about the 3.3v traces... Like do I just solder a wire to it that is coming from my step down regulator? For the controller connections you ground it, and then the red and white labels represent.....? I think I might know that it's for, but I'm not sure. Sorry for wasting your time... I do realize I should do some more research, but I just got ahead of myself. Thanks for replying :D
 
Spiicyice said:
I get where to wire the audio and video. I'm just a little confused about the power. I'm a little confused about what to do about the 3.3v traces... Like do I just solder a wire to it that is coming from my step down regulator? For the controller connections you ground it, and then the red and white labels represent.....? I think I might know that it's for, but I'm not sure. Sorry for wasting your time... I do realize I should do some more research, but I just got ahead of myself. Thanks for replying :D
Yes, solder the output of the regulator to the 3.3v trace. On the first picture, red and white are audio. The red for controller is 3.3v, and the white is data.
 
Okay! :) Thanks a ton, I just needed some clarification. Can I PM if I have any more questions about wiring things to the motherboard? Thanks again :D
 
Spiicyice said:
Okay! :) Thanks a ton, I just needed some clarification. Can I PM if I have any more questions about wiring things to the motherboard? Thanks again :D
Yeah. No problem. I'm happy to help someone out.
 
For this trimming did rewiring component is needed or just remove a big part of the board and then solder the input and output directly on the chip or somewhere near ?
 
i did this with a higher revision board and it is working with the resistor between the pif and the 3,3v but the audio is not neat ( there is a whistling sound in the back) and the video is wobbly (like on an old tv ) . Do this have something to do with the resistor? Should i try different value ? Thank you
 
Hi all,

I have a rev 1 Pal board, will I be able to trim as shown in this thread? If so can I put my 3.3v and 7.2v feed to the same places?


And where can I take my composite video and sound feed from? As I noticed the board revisions being different, mean I don't have the same points. . . .

Thanks

Nick
 
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