HI i have just purchased 5 pairs of Philips PTA518 3D glasses
the instructions say plug in to usb source and charge the red led should show until charged
I plug mine in and the red flashes once and goes off i charged for 3hrs and tried with TV they will not come on but if i leave them plugged into usb source and look at TV they work the instructions are very short and do not seem to have a troubleshooting section can someone please help