Trim help

[Bush]

I trimmed a REV 4 the other day, and it's not giving me any video. I trimmed a REV 8 in the same way and it worked fine. From what I can tell, I don't think it's fried. I tried the 3.3v -> 2.2kohm -> PIF pin 8 method with a 1.8kohm resistor but no dice. If anyone could look over my board and see if there's any glaring problems I'd much appreciate it.

https://www.dropbox.com/s/307gigyvv35w2 ... .02.36.jpg

https://www.dropbox.com/s/bmmrng1f7dt46 ... .03.05.jpg

 

[ToastBucket]

rev 4's are really different from the rest iirc. i remember that they can be trimmed a lot more than other revisions but in a different way.

also might have something to do with those traces cut on the top right in the first picture. looks like they go to the cart slot but i don't remember what they do or if they're important.

 

[Bush]

Do you have any reference I could look at? I've been using bud's guide and that's about the only real guide I've seen.

 

[ToastBucket]

Do you have any reference I could look at? I've been using bud's guide and that's about the only real guide I've seen.

prolly. somewhere.

i guess what i should really say is no.

 

[Bush]

HOORAY

IT'S ALIVE!

Turns out the 1.8k resistor was just too low for it to work. I found two 1k's laying around and bam, video is back. I did a little more research and according to Ashen this is to replace a 2k SMT resistor on the PIF that is easy to cut off on REV 4's while trimming.