Do you mean there is a blue letter "T" on the screen or is the entire screen blue ?
If the entire screen is blue have you checked that the cable from the signal source (whatever it is, antenna, a "box" of some description etc) is securely connected to the TV and that you have selected the correct input on the TV e.g. co-ax, HDMI etc.
Post an image of the screen, so we can see what you mean.
Hi,
Do you mean there is a blue letter "T" on the screen or is the entire screen blue ?
If the entire screen is blue have you checked that the cable from the signal source (whatever it is, antenna, a "box" of some description etc) is securely connected to the TV and that you have selected the correct input on the TV e.g. co-ax, HDMI etc.
Post an image of the screen, so we can see what you mean.
Here's how to do this iFixitでの質問に画像を追加する方法
jayeff さんによる