I'd contact the shop and let them fix it.
Dear Cnet user's and technical staff,
I have a problem and can't seem to fix it.
Tv works perfectly normal with C+ or analog signal for watching normal TV.
But when I now try to use a HDMI signal all works only after ~3 min the TV turns off and the red light is glowing. When I turn the TV on I have the HDMI signal again and it will shutdown after exactly the same time, 3 min again.
Watching first normal TV trough C+ module for a amount of time and then switching to HDMI signal seems to fix the problem... But from standby to HDMI I will always have the shutdown problem after 3 min.
Also from the moment I bought the television it will not update (USB) or connect to internet because of a missing mac address. Tried everything to update the firmware but this is a no go.
Well to sum it up I only have this problem when powering the device directly to a HDMI signal where then the television will turn itself off after 3 min.
Any help or pointers are greatly appreciated.