Hi faishlrani,
If you remove the touch IC and the phone turns on, it means you did not install it properly and it was causing a short. Or it is bad and also causing a short.
But if you remove it and the phone still doesn't turn on, then this would be because during repeated installation you overheated and killed the board or caused a short somewhere.
If you know how to, you must look for shorts or for evidence of overheating. Depending on what you find, you decide if it is worth it to try and fix or just throw it away.
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