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Charging Problem

Hi Guys,
I'm a Lenovo A7000 user. I'm facing an issue from several days. My phone's battery is draining on its own. At first I thought that it's the problem of Battery itself so I managed to replace it but there was no change. So I replaced the Charing port instead which eventually must solve this problem but still there's no change at all. The phone would sometimes not increase the percentage while charging and sometimes would drain the battery percentage within 5 mins of usage.

What could be the cause?
 
You mean Charging IC?

Yeh, or any associated others components that might have failed or burned, like resistors, diodes, capacitors, etc. It could even be a surface mount fuse has blown.

How competent are you with SMD board and component diagnosis and repairs?
 
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