Just installed Froggo's GBC tac mod and after starting up a game I noticed that at least the down button keeps getting pressed. Other buttons are hard to test because it keeps being held down and wanted to know what the best way is to test these controls. Are there any test ROMs that just do the buttons? Already looked around with a multimeter and cannot find anything.
#Best way to see shorts?
verbal elk
hazy mortar
https://github.com/orangeglo/better-button-test should help on the 'identify what's being pressed' front
hazy mortar
do any of those show continuity to ground when you probe?
verbal elk
I'll try in a moment.
thorn estuary
Euh...
I haven't used this button tester before. Does this show A, B, up, and left are all being incorrectly shown as pressed?
hazy mortar
actually had to test it on my unit to verify but yeah i think that's what it's saying lol
thorn estuary
That's an abnormally high number of buttons being "pressed", even for a faulty flex that slipped through. Use a multimeter to check for continuity between each of the test points on the flex PCBs and ground on the GBC
You shouldn't have continuity when the buttons aren't pressed
verbal elk
Yes, there does seem to be some slight continuity between some pads.
A and B don't work, up and left are constantly pressed.
Wait, forgot gnd alt.
thorn estuary
I just noticed that
The flex wouldn't cause them to be pressed at all with GND_ALT not bridged
verbal elk
Decided to redo all the joints and now just up and left seem to short.
thorn estuary
Was everything working prior to installing the tac mod?
verbal elk
Yup, so it's probably the tac mod acting up. I'll try to see if a little bit of IPA might have gotten under the board.
thorn estuary
If that doesn't do anything, and since you'll probably need to take it off anyway, I'd suggest rechecking continuity on the flex once you take it off just to confirm it's that
Obviously, be super careful removing the flex if it comes to that so as not to pull off test pads
verbal elk
I'll have to raincheck for a bit. My solder sucker is having some issues and doesn't really... Well... Suck anymore.
verbal elk
@thorn estuary Removed the flex and it seems like up and left after shorting away from the Game Boy as well.
Not sure if this might be user error or not.
thorn estuary
Post pics of the board with the flex removed
Or wait, did you mean that they're shorting on the flex after it's removed?
verbal elk
They are constantly shorted to ground.
thorn estuary
On the flex?
thorn estuary
Hit me up on Etsy
verbal elk
@thorn estuary Just realised that my Game Boy is now constantly shorting the D-pad even without the flex. So I probably killed my board.
thorn estuary
Post new pictures of both sides. Killing the board shouldn't really be possible in this way
verbal elk
thorn estuary
Try cleaning P01 and P02 and inspecting those pads. If any of the solder mask around the test points came off, there's a possibility you've accidentally bridged them to the ground plane
hazy mortar
also you have a stray solder bogey
verbal elk
Try cleaning P01 and P02 and inspecting those pads. If any of the solder mask ar...
And if that was the case, what would I have to do to fix it?
thorn estuary
Wick off the excess
verbal elk
The excess what? Excess solder?
verbal elk
also you have a stray solder bogey
Thanks.
thorn estuary
Yes, excess solder
verbal elk
Is there anything I can do to remedy this?