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The Sony Xperia Z is an Android based phone that was released in 2013. It is one of the largest phones of the Xperia family with a 5-inch full HD display. Model numbers include C6603/C6602.

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What is this part on mainboard?

Xperia c6603

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it is a small shield that covers some small resistors/capacitors.

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you can see in the picture that on this one it is missing

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Thanks, this is very helpful for me. Is this piece necessary for the efficient work?

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Head phone jack flex cable connector.

Probably this part:

https://www.amazon.com/Cable-Headphone-C...

See step#15 of this guide: Sony Xperia Z Motherboard Replacement

and #18 of this guide:

Sony Xperia Z Headphone Jack Replacement

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Sony Xperia Z Motherboard Replacement

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30 - 35 minutes

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Sony Xperia Z Headphone Jack Replacement

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30 - 35 minutes

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