Antminer T9+ miner repair video tutorials

Miner model: T9 + - 1 video!
1. How to understand which board is faulty in the miner and in which compartment on the board there is a defect.
2. Checking the power of the chips and some reasons that may be in its absence.
3. The location of the chips and domains.
4. The passage of testpoint signals and the method of checking them.
5. All signals are there and at the same time in the "0 asic" log - board repair with explanations.
6. How to identify a defective chip.