I have the same problem with several T9+ the chip is a 1R5 1750 and i cannot seem to find a replacement.
does any one happen to know where to get one or several of these?
Thanks
I don't find any website from google who offering for hashboard replacement.
The only thing comes to my mind is to send it back to the manufacturer for warranty or you can try to check this section
https://bitcointalk.org/index.php?board=75.0 and look for hashboard sellers or buy 2nd hand/broken t9 that you can use for parts replacement.