DIY - How to troubleshoot a S17+ with 0 ASICs detected

Here's a quick description of the steps to take to troubleshoot a S17+ with 0 ASICs: Visual inspection. Anything look out of the ordinary? If not, assume bad chip, let's find it! 1- Find out where the ASIC chain is broken: Inject 1.8v into the RI of a chip to test the chain from chip #1 up to that chip. If testing the last chip in a domain (chips 5, 10, 15, 20, 25, etc) use the 1.8v from the next domain RI is the middle of the 5 test points. Use your jumper to inject 1.8v and fire up the tester to see the results. If you have 0 ASICs, try again, closer to the beginning of the chain (towards #1) If you have the expected number of ASICs, move further in the chain (towards #65) You should now know WHERE the ASIC chain is broken. 2- Find out why the ASIC chain is broken: Measure all voltages and signals going in and coming out of the chip. That includes: 1.8v on pins 16 and 17 0.8v on pins 15 and 18 Clk in and out (0.7 - 0.9v or close to it) CI/CO in and out (1.8v or close to it) No need to measure RI/RO Rst in and out (1.8v or close to it) BI/BO (0v or close to it) Based on your findings, use your judgement to determine which chip is bad. Typically a chip that does not pass a signal while having all the powers fed to it is bad. There is however a chance that the following chip is shorted and pulling that signal to ground. Also test resistors on the signal paths if necessary to determine if they are the cause of a signal not going to the next chip. 3- Replace chip as required. Separate video will be made on that at a later time. 4- Re-test and hope for some progress! (after the board has cooled down). 5- Call it fixed. Hash test for 24 hours or however long you feel comfortable before giving it back. Or if it is your board, tap yourself on the back, you did a good job. ------------------------------------------------------------------------------------ Check out the wiki (work in progress): http://asicrepaircanada.ddns.net/inde... Reach me: On the Antminer Repair Discord server:   / discord   by email: [email protected]