Banggood Dear Anton,Thank you for your feedback and we are really sorry for all the inconvenienced caused during your shopping and looking forward to solve your problem.We have already received your feedback for the order. We would like to try our best to provide you the best solutions. For this reason, if your questions have not been solved yet, please do not hesitate to contact us via the link: https://www.banggood.com/es/Contact-Us_hi111 and provide more details about your question so that we can confirm the case as soon as possible and solve it efficiently.And we will reply and offer you the best solutions after receiving your email within 24-48 hours.Best regards,Banggood Team
04/05/2024
Peter
thanksfor that Anton I have the same fault on my boards The opticoupler lead you highlight is not connected back to -ve.
by making this connection the board works
Glad I found your review.
Thanks
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