Chosen Solution
It’s fixed! According to the repair shop, the trackpad cable was again the culprit. The cable was replaced under warranty. It case anyone is interested, their website is ‘ifixyouri.com’.
Check for the battery sticker colour. If it is pink, red or white with a horizontal stripe, the battery is damaged. test your battery in another compatible phone. If it turns on , well battery is in good condition else, You know….
give it back and repair it again
