Looks my TV has not possibility to connect to 3,5mm jack:
Hello, I am sorry, your TV does not have a headphone jack. You should say that it is a debugging interface. The debugging interface is a dedicated interface for debugging the TV in the factory before leaving the factory. User use will not have any effect. It is not recommended to plug any cable into this jack. You can download a Hisense TV micro assistant, open it and select the tool~Transfer to the secret, you can use your phone to plug in the headphones to listen to the sound of the TV.

Looks my TV has not possibility to connect to 3,5mm jack:
Hello, I am sorry, your TV does not have a headphone jack. You should say that it is a debugging interface. The debugging interface is a dedicated interface for debugging the TV in the factory before leaving the factory. User use will not have any effect. It is not recommended to plug any cable into this jack. You can download a Hisense TV micro assistant, open it and select the tool~Transfer to the secret, you can use your phone to plug in the headphones to listen to the sound of the TV.

radek 发表于 2018-10-23 11:04
我有一台电视更大的海信LED58K300U与相同的Android系统，并有同样的问题。当连接耳机插孔到电视声音时，电 ...

Recommended after-sale call to Hisense: 400-611-1111

radek 发表于 2018-10-22 18:26
your answer not helpful!

You can take a full picture of the back of the TV and show it to me.

我有一台电视更大的海信LED58K300U与相同的Android系统，并有同样的问题。当连接耳机插孔到电视声音时，电视声音应该停止播放只有声音应该在耳机，但注意发生！如果在2台电视机海信LED58K300U和海信LED49K300U上有同样的问题，那么它似乎是Android系统的问题。请帮忙！

I have one more TV bigger Hisense LED58K300U with same Android system, and have same problem. When connecting headphones jack to TV sound out, TV sound should stop **ying only sound should be at headphones, but noting happen! If have same problem on 2 TV sets Hisense LED58K300U, and Hisense LED49K300U, therefore it seems to be Android system problem. Please help!

-Dove 发表于 2018-10-22 17:47
Direct insertion of headphone output noise is very large, may be that the wire is not well connected ...

your answer not helpful!