Hello,
I have an Antminer S9. Few days ago the second hash board died (no red LED). After reading some posts here and watching some videos at youtube I got the feeling that a repair could be possible. I have a friend with good knowledge on electronics and the required tools. My only question is: does someone have the specifications of all components (capacitors, resistors ...) that are on soldered on such a board? This way I could check and replace the component that failed.
In one of the youtube videos the guys says that the specifications could be downloaded from bitmain, but I didn't find anything...
Any help would be appreciated.

Thanks!

What's the exact problem with the boards? Can it be repaired or must it be replaced?

Hello guys.
I just got an antminer S9 from ebay and set it up. It seems to work fine but it has only a hash rate of about 9 TH/s. When checking the miner's status I recognized, it shows only 2 'chains' instead of 3 as shown in manuals... is there one hashboard not working at all? (Screenshot below)
I also recognized, the little red LEDs on the hashboards just aside the power connectors are only on for two of the hashboards. However, changing the power connectors didn't change anything.
Do you know the problem? I couldn't find any information about the little red LEDs or a missing 'chain' in the miner's status....
Thanks for reading.
Cheers.