Help Motherboard question

[Boris Fatic]

Hello everyone!

My Idol 3 5,5 inch broke down after only 3 months of usage. I had my warranty and I got it fixed. The problem was with the motherboard. They changed my motherboard and now it is working. However I have problems with Wi-Fi signal and the phone is slower. So just to be sure that somehow the service team that fixed my phone didn't cheat me I downloaded few programs to see information about my phone. Quadrant Standard told me that my board is msm8916, but under hardware section it says Qualcom Technologies, Inc. MSM8939. CPU-Z also tells me that my board is msm8916. Chipset for Idol 5.5 inch is msm8939, while msm8916 is for Idol 3 4.7 inch if I understand correctly.
So my question is. Is it possible to put the board from Idol 3 4.7 inch into Idol 3 5.5 inch? Is it possible that they screwed me over with this?
Here are the screenshots from the above mentioned programs.
http://postimg.org/image/582frysfh/
http://postimg.org/image/gvwhmihkd/

 

[Hadron]

According to information on the web the 4.7" should indeed have a MSM8916, i.e. Snapdragon 410, while the 5.5" should have a MSM9839 (Snapdragon 615).

To be honest, I'd be very surprised if they could simply fit the wrong motherboard. Even assuming it would physically fit, there's more than just the S0C that's different: the screen resolution is different for a start, and phone components are not generally plug and play, so I'd be surprised if the substitution would work.

But there's a simple test: the 5.5" and 4.7" have different internal storage and RAM, and if they used the wrong motherboard these would change too. From the CPU-Z screen it's clear that this cannot be the 4.7" model's motherboard, as the RAM and Internal Storage are consistent with the 5.5" model and too large for the 4.7". I'd probably trust these apps to get that right more than I'd trust them to identify the SoC correctly (if you look at the "screen size" CPU-Z reports it's clear these things are not wholly reliable!). Also Quadrant is reporting 8 cores, while the Snapdragon 410 has 4 - if you've not shown what CPU-Z says for the SoC, but the number of cores should definitely distinguish which SoC you really have.

(I don't know why these apps are using SoC part numbers as "board" names - that doesn't impress me).