C5 Ultra Start up Issue

[GK24]

Hello Everyone!

For the past 5 months I have problem with my Xperia C5 Ultra dual which shuts off suddenly and doesnot start for long. I suddenly noticed my Xperia C5 was off and would not turn on. 

I assumed something had caused the battery to drain completely, so I went home and plugged it in. 

Red light activates, goes out, vibrates, comes back on, and stays on. After 20-30 minutes, still no activity (not even the charging percentage). 

Then I had to wait for around 30 - 45 mins to again Power on my Mobile. 

I contacted the local Customer Support but didn't get a satisfactory response from their end. They are unable to diagnose the issue and has estimated an expense of 8000 - 10,000 INR for changing the MOTHERBOARD.

Please help me with solving this issue. I dont feel just simply changing the MOTHERBOARD and not diagnosing the issue is a solution to my problem.

[YoGem]

@GK24 I hope this will help you: I own a C5 and after the software upgrade from Lollipop to Marshmallow I immediately had that issue. The only thing that really fixed the problem was a factory reset before a sofware repair. - All this was advised by a Sony Customer Service Rep in Mexico. 

After following this simple procedure my C5 has a wonderful battery life... trying is not going to hurt.

Perform a backup of all your data, remove Sim Card and SD Card, turn on your phone, do a factory reset and then a software repair using Xperia Companion

Once done, restart your phone, put it in charge. Once at 100% turn off, put back SIM and SD card, turn on and let us know if it fix the issue for you.

[rohitb]

getting isshu phone booting just showing sony Xperia and booting after that i connect to sony campion red light turned green while software repair and then my pc got booted since nothing happen just red light show when connect to pc or laptop please help and my phone is c5 ultra dual but their not showing in upper given list

[GK24]

@YoGem Thank you for providing me with a solution to my problem. I have folllowed all related steps as you mentioned in the post but unfortunately my problem doesn't gets resolved. After factory reset I did the Software repair and my software got update to the latest version. 

But as soon as I finished with my repair process, after charging my mobile to 100% the mobile again got power off and a red light appeared and no charging percentage was getting displayed. 

After frequent trails of starting my phone finally it got started after almost 20 - 30 tries. M worried that this problem will again happen.

In case you could help me with fixing this problem I will be highly obliged, as this is one of the best phone I ever exeperienced in my life.

Thanks. Waiting for replies.