Ethernet LED is not on

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Ethernet LED is not on [Copy link]

I'd like to ask the omnipotent forum masters whether there is a problem with the hardware circuit design. When the network cable is connected, the network port LED will not light up, not to mention the subsequent sending and receiving of data. I hope the masters can give me some guidance.

chunyang

It is recommended to read the manual to check whether the hardware circuit is correct. Pay attention to two places: one is the chip peripheral circuit, and the other is the wiring of the network transformer. There are many types of network transformers, so pay attention to the wiring.

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chunyang posted on 2020-6-23 15:27 It is recommended to read the manual to see if the hardware circuit is correct. Pay attention to two places: one is the chip peripheral circuit, and the other is the wiring of the network transformer. Types of network transformers...

This is the board I bought, and someone else said it was OK, and even listed pictures. Now I've looked at it, and it doesn't work, so it's very troublesome.

chunyang

Bushoulun published on 2020-6-23 15:59 This is the board I bought. Others said it was OK and listed pictures. Now I have taken a look and it is not working. It is very troublesome

Then confirm whether your cables are intact, the line sequence is correct, and whether there are any problems with the power supply and front-end interface. After eliminating external influencing factors, you should suspect that there is a problem with the board itself.

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chunyang posted on 2020-6-23 19:40 Then confirm whether your cables are intact, whether the line sequence is correct, whether the power supply and front-end interface are OK, and after excluding external factors, you should suspect that it is the board itself...

The cables can be confirmed, so the board should be fine.

qwqwqw2088

Since it is a set of things purchased,

It is estimated that the power supply is not correct. It is necessary to check the cables, line sequence, power supply interface, etc.

The hardware circuit needs to be checked in the corresponding chip manual, including the peripheral circuit

Then we need to know what is going on with the software control part.

chunyang

Posted by 不足论 on 2020-6-24 10:47 The cables and other items can be confirmed, so the board should be fine.

You can borrow a board that has been confirmed to be intact for cross-comparison testing, or simplify the external conditions as much as possible, and then provide these conditions to other friends who have the board and test them under these conditions to see if the problem is the same.

damiaa

Is the power on? Is the power voltage correct? Is the wire good? Check more.

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damiaa posted on 2020-6-30 16:32 Is it powered on? Is the power supply voltage correct? Is the wire good? Check it more.

Lines and everything are good.