iPhone 5s is dead after logic board change and recovery

Dear Sir or Madam,
my iPhone 5s had a logic board issue and therefore I’ve ordered a new logic board and replaced that. After changing the logic board, Itunes automatically entered recovery mode and the recovery has been completed successfully. However, right after that my phone is not turning on. It’s completely dead. Itunes told me something to restart or something like that, but right after that the iPhone just died. Now it doesn’t even enter the DFU mode. What would be the reason for this problem?
Thank you and best regards!

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Are you able to tell if the device is taking any charge or if it is heating up at all? Where did you acquire the replacement logic board? Through a reputable reseller or from some slightly-less authentic online retailer such as wish?

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