I hope someone can help. I designed two PCBs in design spark that I have had manufactured. The two boards are linked via a 3 wire JST-PH connector but the two boards are not working together. Having done a lot of investigation with my husband we have deduced that the power is reversed on the second board, so the LEDs would light up if they were wired up backwards.
Both boards work correctly on their own (they both have battery power input for testing), but not together so it has to be the JST-PH connectors causing the problem.
The boards use bi-colour LEDs (Red/White) that have a common Anode so the resistors go to the cathodes of the LEDs.
A 3 way toggle switch switches between the two colours and off.
We think that I have incorrectly designed the schematic and that the JST connector pin 3 should be connected to 5v rather than gnd (because the LEDs need current through the cathode).
But we're not sure. I'm concerned about wasting more money on an incorrect design. If anyone can help with this it would be appreciated.
I can only post part of the design as it's for one of my products for my business but it should be enough to show what is required.