Hi dear sir, we are also vendor of dayun z1 machines, to be frankly , dayun has after sales serveice. its process as below:
if u find a problem with machines , u have 2 choices:
① u send machine back to factory to do a test and check the problem , after maintainance, we send machine back to u , shipping cost will be covered by customers
② if u can find the problem, such as control board, or fans or hashboard. control board and fans can be bought and sent to u from factory directly, also shipping cost covered by customers, if it is problem with hashboard, can only send back to factory and change new one for u.
Nǐhǎo Grace
actually I just need to purchase a new control board, could you provide it a a reasonable cost?
Shipping by DHL collect (I pay the freight charges using our DHL import code)
Xiéxié
/E