I bought the contact A850 plugged in the headphones to listen to the blurry song and change the head

We apologize for any inconvenience caused. The A850 headphone jack adopts the American standard standard, you need to use the headset with the American standard interface to use it normally, please check whether the earphone you use is the American standard interface.

If the earphones with the American standard interface still cannot sound normally, and the replacement earphones are invalid, it is recommended that you back up the data by yourself and try to restore the factory settings to rule out whether it is caused by system abnormalities. If the factory reset is still invalid, you need to go to the Lenovo maintenance site for testing and maintenance in time, which is generally caused by the failure of the headphone jack, please understand.

Lenovo authorized repair site inquiry.

Whether your headphones are original or separately fitted.

If it is the original, plug and unplug it a few more times to see, if it doesn't work, try to plug it in slowly, listen to whether the sound quality changes, if not, report for repair.

If it is another match, without a microphone, try to plug in slowly, listen to whether the sound quality changes, if not, it is caused by the different circuits of the headphone interface, and the general quality problem is not very likely, but it is not excluded.

If it is with a microphone, try to insert it slowly, listen to whether the sound quality changes, if not, press the answer on the microphone to see if the sound quality changes, if it changes, it is caused by different wiring of the internal circuit, non-quality problems.

Go to customer service or the official website to inquire...

Change the headphones to see if you still can't hear clearly, if you can hear clearly, it's a problem with the headphones, or if you can't hear clearly, it's a problem with the connection. You'd better try to change a few more headphones, because most of the problems like yours are headphones.

Possible Causes:

The sensitivity of the headphones is too high, and a very small audio voltage can drive it;

The headset hardware is damaged, resulting in noise, it is recommended to replace the headset;

If the driver fails, it is recommended to update the mobile phone driver;

The most common reason for the hardware damage of the mobile phone is poor jack contact.

Hi! It is possible that you are using a non-standard headset, or that your headphones are not plugged in securely.

It's normal that the phone will have a little noise, but it's just amplified by the headphones.

If there is a problem in the earphone, the earphone is broken, and if there is a problem with the phone, it is that the headphone jack of the mobile phone is broken, mostly caused by water ingress.

Hello, may I ask if you have such a problem when using the earphones that come with your mobile phone, you can try to change the earphones. There are European and American standards for headphones

If you have any other questions, you can enter the OPPO enterprise platform to ask customer service questions!

Hello, I'm sorry, give a copy.

Your use is inconvenient.

If your device is using headphones abnormally.

Dear user bai, hello!

This is Lenovo du

Knowledge of frequently asked questions.

zhi library,There is a relatively complete answer dao in it

The case and know that it has been inside.

Programs and Analysis:

We apologize for the inconvenience.

If the situation persists, it is not excluded that the phone system is abnormal, it is recommended that you try to use a factory reset, you can find the corresponding option through System Settings - Backup and Reset. Since restoring factory settings will erase the original data information, it is recommended that you make a backup first, you can use the cloud service for cloud synchronization or you can back up the data on the computer through the Le Assistant, you can visit the cloud service official**.

Hele assistant official**.

If such problems still exist after recovery, it is recommended that you contact Lenovo authorized repair sites in time to have them tested and maintained by engineers, and you can visit them.

Find the nearest site. The business hours of the maintenance site are usually from 9:00 to 18:00 from Monday to Sunday, except for holidays, and the stations will be slightly adjusted according to their own operations.

If the other party can't hear the sound or the sound is low when your device is on a call, Samsung phones generally recommend the following steps to troubleshoot and deal with it:

1.Check that the device microphone is not occluded. If there are two microphones, please check both.

2.Check whether the "Mute" function is turned on in the call interface.

3.Restart the device and try to change it to a different location.

4.If it doesn't work, back up the important data in the machine and try to restore the factory settings.

If the problem persists, please bring the purchase invoice, repair card and machine to the Samsung service center for professional after-sales engineers to help test.