hashboard repair: Diagnosing 0 asics found and LDO discussion

In this video, I discuss diagnosing a 0 Asic error on this dashboard. I take you through the steps I made and where I found an error on the board. In addition, we take a side discussion on LDO's (voltage regulators) on the T17 (and most antminer boards).
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[@alpriore4909]

Watching this video convinced me I can't repair my hash boards.

[@AntminerRepair]

I willing to bet you can. Come on in discord and start asking questions. You would be surprised what you can do.

[@Taufix182]

Hello, I have hashboard L3+ which which one of LDO (most left) under chip number 66, when i check using multimeter, GND and OUT is short ( 1 ohm) Maybe you know what the problem? Thanks you 🙏🙏

[@anjuladesilva5561]

I have a T17 miner and some times all the 3 hash board works fine and most of the time when rebooting 2 of the hash boards shows 6 ASICs found and the other board shows only 24 ASICs found. But if I unplug the miner for couple of hours the boards some times pick all the 30 ASICs and works fine for couple of hours and gives and error chain #0 or Chain #1 malfunction and stops working. Please suggest what I should do

[@AntminerRepair]

Loose solder connection heat related

[@greendaydz]

32:23 i have a short in the capacitor C596, i removed the chip but the short still here, i checked the LDO they are fine, i cant find the short, any suggestions

[@AntminerRepair]

In my experience on the T17, the shorts are usually in the chip or soldering. I have yet to find a burned up capacitor, with the exception of some of the electrolytic capacitors on the back. I know in some other models (L3 for example), LDOS and caps are frequent causes of pain...

[@greendaydz]

@@AntminerRepair i removed a asic chip but the short still here,so its not soldering issue

[@worldentropy]

Only trouble here is that the dredded SY8120B1 boost regulator is not stocked by anyone, and the Ti equivalents (better ...etc.) are not pin compatible. Go figure.

[@kevinjames1587]

What guy from Russia were you referring to?

[@AntminerRepair]

kzbin.info/door/RynQfCfcOJGGLS1PBnJsYgvideos

[@CryptoMinerCHR]

There are several ldos out there, luckily they are listed in the repair manual, but they give 2 different ones, are they interchangeable? And does mA rating matter?

[@AntminerRepair]

@@CryptoMinerCHR I don’t think so. One is adjusting voltage and the have the circuit to support it. The other is fixed output