TL-SL3428 and TL-SL2428WEB
Power Supply Module: 100～240VAC, 50/60Hz Input; 12VDC/2A Output.

thank you very much! :)

Whoever else reads this, this information is not correct. At least it's not for the TL-SL2428WEB. I just plug it in with 12V DC 1.5A stabilized voltage and it died on me. I know for a fact that the switch was operational before because I tried it with a 5V DC transformer and it worked all right.

I've come across this problem. Is a question of procedure, if is the network card working not good after restart. 1, it is recommended that you change your network card drivers, is to change a version (whether high or low). If there is no replaceable will execute the next step. 2, there is a reason is that in the system often leads to other software plug-ins, suggest using 360 plug-in (clean plug-in), open system of suspicious especially Q useless software or valley, search and other plugin and so on. Clean play plug-in system, and then try again!!!!! The main parameters
Product type: network switches
Application level: on the second floor
Transfer rate: 10/100/1000 MBPS
Exchange way: storage - forward
Backplane bandwidth: 20 GBPS
The MAC address table: 8 k
Port parameters
Port structure: the modularity
Port number: 30
Port description: 24 10/100 MBPS RJ45 port, 4 10/100/1000 MBPS port, RJ two gigabit SFP optical fiber
Control port: 1 the Console port
Transfer mode: full duplex/half duplex adaptive

I have these switches with dead power supplies.

You can check the following link to see the power supply of TL-SL3428.
http://www.tp-link.com/en/products/details/?categoryid=&model=TL-SL3428#spec

It is not complicated to check these parameters on TP-LINK website.
Anyway, if your power supply is dead, I guess maybe you can contact the local retailer to seek for help.