LCD20A71 LCD TV card problems

There LCD20A71 trump LCD TV, currently there are problems:a day after the start of the first 10 minutes after the image suddenly disappeared, but a normal voice.Clearance to open after less than a minute and no sound plans.Inspection Normal power supply (223V), TV The normal signals.

My house TCL's LCD also seen this phenomenon is the aging of the picture tube in the warranty on the line they change, Over the warranty period on the outside must change for the better, I started a home-for-50, less than half a month on a black screen again.Backlight may be the board backlight power supply failure or abnormal