can't get continuity on the 5V or ground pads

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rodocop
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can't get continuity on the 5V or ground pads

Post by rodocop » Mon Jul 24, 2017 4:21 pm

Hi all,

I can't for the life of me get any continuity between the 5v and gnd. I have tried everything, solder, flux, reheating etc... They do not seem to be bridged, since I do not have continuity between 5V and GND. My next step will be to simply solder a wire for each, but if someone has some advice let me know!

I have continuity on all other pads except those two.

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Re: can't get continuity on the 5V or ground pads

Post by djbriane » Mon Jul 24, 2017 4:28 pm

I had similar issues with both of my builds. Had to reflow it a bunch of times until I got it solid on both, on one of my builds I gave up and wound up running a wire directly from the back of the Pi for ground (same result in the end I figured)

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Re: can't get continuity on the 5V or ground pads

Post by rodocop » Mon Jul 24, 2017 4:34 pm

djbriane wrote:
Mon Jul 24, 2017 4:28 pm
I had similar issues with both of my builds. Had to reflow it a bunch of times until I got it solid on both, on one of my builds I gave up and wound up running a wire directly from the back of the Pi for ground (same result in the end I figured)
hmm, yeah, i'll try a bit more but it's looking like a wire be my easiest option. At least i'm not the only one! I will use some pretty thin wire, you have no issues with space after adding a few wires?

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Re: can't get continuity on the 5V or ground pads

Post by Helder » Mon Jul 24, 2017 4:41 pm

What pads and GPIO's are you testing continuity? Post some pictures of the soldering job and the pads. You need a thin iron tip and not your generic Radio Shack or equivalent crap iron which has a larger tip that is hard to solder these to the pads below on the pcb.
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Re: can't get continuity on the 5V or ground pads

Post by dryja123 » Mon Jul 24, 2017 4:48 pm

Exactly what helder said. You need to have a solder tip that will actually stick into the hole so you can make a connection from the pi to the board.

I used the Weller ETO tip (compatible with my soldering station)
71goMX4vofL._SX355_.jpg
71goMX4vofL._SX355_.jpg (9.32 KiB) Viewed 7307 times

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Re: can't get continuity on the 5V or ground pads

Post by rodocop » Mon Jul 24, 2017 4:55 pm

Helder wrote:
Mon Jul 24, 2017 4:41 pm
What pads and GPIO's are you testing continuity? Post some pictures of the soldering job and the pads. You need a thin iron tip and not your generic Radio Shack or equivalent crap iron which has a larger tip that is hard to solder these to the pads below on the pcb.
Yeah, I definitely do not have the greatest soldering iron, which may be part of the issue, but I had no problems with any of the other pads. As for the GPIO pins, I am testing the 5V and the GND GPIO pins on the pi that correspond to your board. Also, here is a pic:
padsShow
Image

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Re: can't get continuity on the 5V or ground pads

Post by Helder » Mon Jul 24, 2017 5:03 pm

just run a wire from the GPIO to the VCC to the right NOT the one below the 8 pin ribbon connector and GND can be any GND on the pcb.
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Re: can't get continuity on the 5V or ground pads

Post by rodocop » Mon Jul 24, 2017 5:40 pm

Helder wrote:
Mon Jul 24, 2017 5:03 pm
just run a wire from the GPIO to the VCC to the right NOT the one below the 8 pin ribbon connector and GND can be any GND on the pcb.
Yeah. So after changing solder tips I was able to get continuity. But...after I put the sd card in and hooked up the screen continuity was gone! So I just soldered some wires. Now it works.

Headphones work, screen works. Buttons work!

On to the case mods I guess. Thanks for the input guys.

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Re: can't get continuity on the 5V or ground pads

Post by djbriane » Tue Jul 25, 2017 11:06 am

rodocop wrote:
Mon Jul 24, 2017 4:34 pm
djbriane wrote:
Mon Jul 24, 2017 4:28 pm
I had similar issues with both of my builds. Had to reflow it a bunch of times until I got it solid on both, on one of my builds I gave up and wound up running a wire directly from the back of the Pi for ground (same result in the end I figured)
hmm, yeah, i'll try a bit more but it's looking like a wire be my easiest option. At least i'm not the only one! I will use some pretty thin wire, you have no issues with space after adding a few wires?
I didn't have any issues with space after running a jumper from the GND pad on the Pi to the GND below the ribbon cable. It was also very flaky for me where I'd get a good connection according to my multimeter but it wouldn't stay connected once I moved things around. The jumper cable is less than ideal but once it's closed up no one will know. :)

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