Nesa car dvd wont read usb - Nesa Vision NSD-790T Car DVD Player

SOURCE: Nesa DVD 1002 in car DVD player

do you have the remote?

SOURCE: NESA DVD-1002 Car DVD - Region Codes

Oh that sucks... I had the same issue with a Sony Xplod Indash DVD Player, You have to contact the Manufacturer, They will either replace the system, or explain to you how to fix it, In my case they replaced mine.

SOURCE: my Nesa portable car dvd

Hi,
If you have necessary tools and test instruments, know safety precaution in basic troubleshooting try the steps below to solve your problem.
Assuming that the disc is good.
1.Clean the lens. - Sometimes because of dust and any fine foreign objects the lens can't read any disc. If you have a DVD Lens cleaner, play it to the unit. If this is not available you may manually clean the optical lens. Open the cover and gently clean the eye of the lens by smooth,clean,soft cotton buds. Be careful while doing this, just a gentle stroke only.
2.Check the ribbon - Check the ribbon connected to the lens from the main board for scratch, damage. Once it has an open line then of course the lens can't read the disc. Also try to erase the contact by pencil eraser. If you've done the steps above and the symptoms still there then the next step requires you a little knowledge in soldering technique and reading the ohmmeter.
3.Check the motor - Check the motor that spin the disc with an ohmmeter. You can test it using the ohmmeter (x1) even it is connected on the lens assembly.Good motor - reading should be fairly high and it will spin. Bad motor- reading will drop to low resistance and will not spin.

Click this link for more info.

LINK1

LINK2

Hint : Most of my repaired unit the above parts are commonly caused of the problem.
If you confirmed that you have a defective motor then replace it with a new one. Before replacing the new motor you have to check the clearance of the disc holder with the old one. The clearance should be the same as the old because if not the lens will not read the disc if it is too far or too close.
If the above steps didn't cure the problem, high chance that your optical lens was faulty.

If you can't do the job yourself, I would advice you to look for a professional to troubleshoot the symptom.

Hope I helped you.
Have a nice day!
Thanks for using Fixya.