I have sinotec tv it's stuck in USB mode how do I exit it without a remote

Most of those brand TV's should have function buttons on the side of the unit behind the screen.

Look on the right and left sides behind the screen and you should see them.

I just googled Sinotec and found an O/M which shows it, so you can Google your TV's model # to confirm.

This one shows it on page 5.

https://www.manualslib.com/manual/918457/Sinotec-St-29me70h1.html?page=7#manual

St-39kc70 sinotec

At the back there a menu buttons or source press then go down using volume up or down use menu to select

I know how to remove hat buy a universal remote and contact me on 00263772913731

Buy a universal remote.......can be used on any tv after setup

You should have it remote control to reset it.
To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Without its remote control, you can't select its inputs.
If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one.
If you wish to get more; check the site linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Pull up older posts.
http://electrohelponline.blogspot.com/
http://remotesearch.blogspot.com/

There are two types of reset to TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

You do not need a remote control. I used my smart phone with IR. Down load tv remote apps and wala its sorted.dont buy universal remote it did not work for me could not find the Sinotec that i have so wasted R400.00