The picure appears on the screen in brief flashes
The device is an LG 47LB630V television. The picture appears on the screen as brief flashes at about 2-3 second intervals, between which the screen is dark. Sound comes normally without any cutting or fading. The remote control can be used to turn the tv on and off, but cannot make the tv change channel. What can I do to get the tv to work normally? I have tried disconnecting the power supply and re-connecting it, this made no difference.