Chosen Solution

I’ve tried different chargers/cables/PC/power bank, I’ve also got a new replacement battery. It won’t power on, black screen is all I got. Pressing Power for 10s or Vol Down+Power or Vol Up+Down+Power didn’t bring anything to the screen. While connected to a power source, the red LED light flashes every second. No other response at all. Someone please help!

there might be a problem with the display or the mother board. can you say what happened?