@gilsonsilvaseo could be a bad LCD but could also be a bad GPU etc. We really need to see what this all looks like. Take some good pictures of what your display shows you and post those with your Question.
If it turns out to be your LCD, download the Hardware Maintenance Manual [https://download.lenovo.com/consumer/mobiles_pub/s145_series_hmm_201902.pdf|from here] Page 62 shows you how to replace it.