Green vertical lines once turned and Black screen wit red standby led

Hi everyone,

hope you’re doing well and safe! I have an issue with my LG 47lm670s tv Screen, once i turn it on it shows the LG logo with green vertical lines and it stays like that for some one minute and later it disappears living a thing green lines web in the whole screen and totally black with red standby by led flashing!! Pictures attached**

Would like to repair it but im curious if it’s the Power Supply board or Main one that could be the issue!

Please if this happened to you or you have any helpful idea about this issue feel free to comment! Much appreciated and stay safe.

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