black screen after replacing charger assembly

i replaced charger assembly on my note 9. after reassembling i connected to a charger, the phone vibrated and the red blinking light appeared, but I can’t turn on the phone.

I have tried the soft reset (holding down volume button and power button for 10 seconds without success. Perhaps it’s a hardware problem or I didn’t reassemble it correctly

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Have you tried putting the old charging assembly back into the phone and attempted turning on the phone again?

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Yes. Same outcome.

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