1 In the "Power Options" window, drag the "Screen Brightness" adjustment button below to adjust the screen brightness; 

2 Because the screen brightness of the external screen is light-controlled, please check whether there is any obstruction blocking the light control head of the external screen.

Our regular warranty period is one year. If there are special requirements, it can be two or three years. General after-sales service can be as follows:

1. Paid spare parts can be provided at any time;

2. If there is a batch failure problem, we will arrange personnel to handle it on site;

3. If the customer's order is relatively large, we will directly provide some spare parts, usually at a rate of 2% for free.

1. We accept payment in US dollars;

2. When placing an order, you need to pay 50% of the total order amount as a deposit, and the balance is paid when shipping;

1 Reset the current time;

2 If the time is still inaccurate after resetting the current time, replace the battery with the corresponding specification.

1. The power cord, socket, etc. are loosely connected

Check the power cord connection, whether the socket is loose, and connect the power cord and socket.

2.The power switch is not turned on

Check the power switch and turn it on

LCD has low heat and low power consumption, which is more suitable for long-term operation. However, from a maintenance perspective, LCD should still be given time to breathe, after all, LCD is a relatively fragile product, and problems are not easy to solve.

1. Check the audio connection to ensure that the audio cable or speaker is connected correctly.

2. Check the volume settings to make sure the volume is not muted and adjusted appropriately.

3. If you use external speakers or speakers, please ensure that their power and audio connections are normal.