Question Resistance help

[JBmodz]

Just trimmed my wii and started doing resistance readings, im having weird readings between every voltage and ground to 3.3v, they all read around 2k sometimes, other times 1k, but every once in a while they read 5k and then the meter starts climbing to 8k after 10 seconds, I assume this means a short, so should I just sand more? and are my other ones good? I marked the ones with the weird climbing resistance with an arrow.

 

[JechtZ]

What settings are you using on your multimeter?

My auto set didn't work great for 3.3v. I had to use 2k for everything other then 3.3v and 20k for it.

 

[JBmodz]

What settings are you using on your multimeter?

My auto set didn't work great for 3.3v. I had to use 2k for everything other then 3.3v and 20k for it.

Just the resistance setting

 

[JechtZ]

Yeah I had issues with using that with mine. Do you have the options I listed on your device?

 

[JBmodz]

Dont think so, what would it look like?

 

[cy]

If you had a short between your voltages or ground, you'd get 0 ohms of resistance between said voltages or ground. 1.8v is kind of an exception since it normally has a very low resistance between it and ground on the Wii. If you're worried about the layers being shorted anywhere, I would visually inspect the edges of the board to ensure that nothing is clearly shorted since you can see the layers if you just look at the edges.

It's also worth noting that resistance values are subject to change as you connect things like the Wii PMS and or anything else to the motherboard. Using Nold's Wii trim resistances guide, it looks like everything except for your 3.3v resistances are as expected, and you said those appear to be rising after you probe for a bit so it sounds like those are probably in spec. I'm too sure why they're changing after a bit, maybe something to do with the capacitors on the board discharging? But higher resistances on that rail (such as the measurements you've gotten after probing for a bit) are a good sign.

I think you're probably fine with this one.

 

[JBmodz]

If you had a short between your voltages or ground, you'd get 0 ohms of resistance between said voltages or ground. 1.8v is kind of an exception since it normally has a very low resistance between it and ground on the Wii. If you're worried about the layers being shorted anywhere, I would visually inspect the edges of the board to ensure that nothing is clearly shorted since you can see the layers if you just look at the edges.

It's also worth noting that resistance values are subject to change as you connect things like the Wii PMS and or anything else to the motherboard. Using Nold's Wii trim resistances guide, it looks like everything except for your 3.3v resistances are as expected, and you said those appear to be rising after you probe for a bit so it sounds like those are probably in spec. I'm too sure why they're changing after a bit, maybe something to do with the capacitors on the board discharging? But higher resistances on that rail (such as the measurements you've gotten after probing for a bit) are a good sign.

I think you're probably fine with this one.

Ill sand more later today and see if the same thing is happening, I tested the 3.3v again to all of the other points and got 1k a couple times, mainly 1.8v-3.3v.

 

[JBmodz]

If you had a short between your voltages or ground, you'd get 0 ohms of resistance between said voltages or ground. 1.8v is kind of an exception since it normally has a very low resistance between it and ground on the Wii. If you're worried about the layers being shorted anywhere, I would visually inspect the edges of the board to ensure that nothing is clearly shorted since you can see the layers if you just look at the edges.

It's also worth noting that resistance values are subject to change as you connect things like the Wii PMS and or anything else to the motherboard. Using Nold's Wii trim resistances guide, it looks like everything except for your 3.3v resistances are as expected, and you said those appear to be rising after you probe for a bit so it sounds like those are probably in spec. I'm too sure why they're changing after a bit, maybe something to do with the capacitors on the board discharging? But higher resistances on that rail (such as the measurements you've gotten after probing for a bit) are a good sign.

I think you're probably fine with this one.

Sanded a bit more and tested again for all of the 3.3v connections, same result, sometime 1k, sometimes 2k, and other times the rising 5k-8k.

 

[cy]

What grit of sand paper did you sand up to? I like to start with 220, then go up to 500, and then hit it with 1000 for a bit. I think you can get away with up to 500 though.

Also, it probably also wouldn't hurt to post pictures of your board. Either way though, based off your resistances, I would imagine the console probably works.

 

[JBmodz]

What grit of sand paper did you sand up to? I like to start with 220, then go up to 500, and then hit it with 1000 for a bit. I think you can get away with up to 500 though.

Also, it probably also wouldn't hurt to post pictures of your board. Either way though, based off your resistances, I would imagine the console probably works.

150, 320, 600, 1000 there are pictures on my worklog, they were taken after the Initial sanding, I can post more if you want