crwdns2934241:0crwdne2934241:0 Screen of death

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What is sleep of death in sony xperia z1 compact

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I hav replaced screen on z1 compact.it has now started to flash sony logo on screen then screen goes black unsure if it is on or off then red led flashes 3 times then another 3 times and screen still remains black or off.hav tried to charge battery in it and still nothing. Any help would be gratefully  accepted

Thanx

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Sony Xperia Z

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open