Arduino nano Chines clone

Hi

I am using Arduino nano Chines clone and it is working but only issue is whine external power is connected ( Vin) can't program ( upload ). Once the External power is removed I need to remove the USB cable and re connect then I can upload without fail.

Please advice and modification to be done or reason to this issue

Thanks in advance

PA3040

(deleted)

Dear spycatcher2k

I am 100% agreed with you. Could you please advice what kind of engineering solution that we can apply to solve the issue

(deleted)

Dear spycatcher2k

Thanks for the support and reply

Please find the attached schismatic which had been given by supplier

Please advice

Thanks in advance

nano_ch340_schematics-rev1.pdf (852 KB)