Hi Evelin Rodriguez 6138,
 
Thanks for reaching out! Let's solve this issue together. First, I have some questions:
  • Which specific display device is this post in regard to? (model name, generation number)
  • When you see the G, does it have a white or a gray background?
  • Have you tried conducting a Factory Data Reset?
  • Could you post a photo of the screen with the G on it?
I look forward to your response, thanks.