It may be caused by dust accumulation or the like, or the small capacitor material problem.

Check

1, the network

2, the pool

3, the time setting

The ground terminal of USB-TTL is not connected properly to the tester.

It is possible that there is an issue with the interface, or you can try reseating the CPU. Another possibility is a problem with the network socket. If there has been water damage, oxidation is more likely to occur.

LDO (Low Drop-Out) regulators supply power to the chips within a domain in the CO direction.

Recommend to use coolant because it has high hot spots. It is better to use distilled water. If tap water and mineral water are used, the pump may be stuck by impurities and cannot work.

Should be CE BIN2

Should be CE BIN2

The LDOs in domain 1 to domain 16 can be used universally. They are the low voltage LDOs.

The LDOs in domain 17 to domain 21 can be used universally. They are the high voltage LDOs.

But the low and high LDOs can not be exchanged.

Check the BTC tool software version, it should be the latest one.

Check the network. Replace the router and switch.

Do SD card flashing and then update to the latest firmware.

This shows it is normal. It needs to upgrade to the latest firmware version.

Model 1542 and 1529 are interchangeable and used as substitutes.

There are severial kinds of power IC for S9.