@tufantas you can provide 5V power via the 5V_EXT connector. See https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/33DEuEJZXP16vLbF.huge.
If you PM me your address then I may be able to send you a replacement chip, if I have any spares and it survives the customs and import procedures of your country.