Early Detection : Is your EV200D a lemon?

The Eachine EV200D have excellent picture and reception... when they work.
There have been reports of quality problems and since Banggood provide zero customer support or repair, it is best to know if you have a lemon before the 30 return window expires.
This guide is meant to help you gauge how lucky you got at this QC roulette.

1. shake the goggles - some units have lose elements in them
2. power a vtx with camera with enough juice for a few hours, set it at at pit W or 25mW
3. connect a 2A 5V usb power to your goggle, aftere 3 beeps and a few seconds you'll get image
4. select or scan to find your vtx - if lock doesn't work on the first time verify that you are feeding these 5V 2A. If you still have no final lock, power all off and reverse the power on sequence.
5. check that the image is good on both goggle panels - There has been report of dust in the optics and also bluriness
6. insert a microSD, turn on DVR and record
7. let it sit for a couple hours, recording
8. during this time you can 
1. move the vtx+camera+power around to check commutation between the 4 receivers and how DVR handles snow, power off then on the VTX, go out of range etc...
2. put the goggles on your head to check for heat, noise and vibrations - The Raeon display hardware get so hot that Eachine added a cooling blower that runs constantly. This tiny blower runs at high RPM so any defect magnifies vibration.
9. after the test period, look through the optic to verify that the image is still good (some units lose a color component in certain conditions) and verify that your DVR recorded the amount of time that it was on.

If you pass this test, you are a lucky one and should play the lottery more often - seriously, enjoy flying with these amazing 720p goggles.

If some parts of the test fail and that bothers you, you can ask for a refund for up to 30 days, past that , it was reported that BG is unwilling to do anything but you can try, Paypal is your nuclear option so it is highly recommended to use it to pay for these goggles.
Since BG cannot fix these goggles, what they do instead is send you a portion of your money back (60 to 90%) or sends you a new unit for $30 and you keep the other. Which is awesome if you're into modding.

If you want to mod them, for example to quiet down the buzzer or the CPU fan, you can ask on the telegram group.