Question Questions before Trimming

BASE6

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Aug 4, 2019
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Hey guys,

My 5" Good Display Screen just arrived with most of my other parts and after removing the memory card slot I'm ready to trim the Wii motherboard. I just have a couple of questions before committing to trimming this weekend:

Is the Pre-Amp IC near the AV output required to keep if I plan to use the U-Amp? I don't think it's necessary since when I looked up the BOM for the U-AMP since it already has a 2.5W LM49450SQ Amplifier in the U-AMP. I'm planning on having the headphone output to be connected to AV input on a TV as well as for headphones so I want to make sure if it is a good idea to remove the Pre-Amp or to keep it since I can't find it in the documentation.

Second, I was reading in The_Smeags' WorkLog
https://bitbuilt.net/forums/index.php?threads/g-wii-build.2859/page-2
that Jefflongo was talking about Power Pin to Ground Resistances after sanding the trimmed Wii Mobo. What is a "good" 3.3V to Ground Resistance that I should be trying to get if it is above 10 Ohms?


Finally, Is it possible for someone to check my trace marks on my Wii Mobo before I commit to trimming?

I do have a dummy board to practice on so I can erase if it is off.

Thank you in advance for taking time in reading my post. Hopefully if everything goes right I'll make my first worklog post.

Apparently I think the links didn't work so here's the photos:
https://i.imgur.com/BvUJVHJ.jpg
https://i.imgur.com/bELZlhL.jpg
 

jefflongo

Broke BitBuilt
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No you don't need the preamp if you are using the U-Amp. You should remove it. I don't recall what the correct resistance is on the 3.3v line but if it's above like 1kohm then you are fine.

Trim lines look fine, I would rip off that big inductor first though. Good luck! :)
 

BASE6

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Thanks Jeff. I think a note should be added to the Wii Section on the U-Amp Documentation so people can avoid this confusion.
 
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