I have a this problem with my miner hash board T9+
I lost some ASIC in chain, how can I find damage ASIC? my board did not have warranty ,so I am looking for a solution for repair them.  I had to measure the clock frequency of chip to find a faulty chip, but I could not run board out of box
the measurement is very difficult due to heat sink ,box and unavailable test point(under heat sink)
I know the connection between chip, I know a TX/RX signal go a chip and some signal(RST,CLK,CO,BO,RI) form this chip go next chip , and I thought the chip with tx/rx signal is first ASIC and next chip is second ASIC  ,.....
But it seems that I was wrong
 
please Guide me how can I find damage ASIC in t9+ hash board ?  

I hope to give your reply.

hi
when i connected t9+ , i see one of the chain of hash board work with 12 asic inseat of 18
I need to learn  how about can i repair hash board of t9+ ,I see the below video from s9+ and i know they are have Differences,
and I know all of the asic have a common ground in bottom side of board (an other side of that put asic)
but I measure resistance in test point on hash board and I have  big Difference between asic test point for example I see 3.6 ~4 M ohm in (co,bo,Ri ) whice value is right?
and ~10m ohm in clk and 1k in reset
and see voltage in diode mode of multimeter and I test like video way but for Ri I use same gnd and same heat sink I see same voltage when  change negative and postive porb in diode test

can you help me how can i repair it? and I have true way or not to test
https://www.youtube.com/watch?v=yAiaHwRkrC4

thanks for your guidance.