[Nexus 5X General] curiousbeing:
New Mod-Multi layer Heat sink.

I tried a small aluminium heat sink, and it worked fine without any issues but when I tried to play high-end games, and when CPU temperature has gone above 60-65 degrees it hanged and shut down, but never experienced any boot loop. After keeping the phone idle for few minutes it started working again.

However, I decided to go a bit further and opened my phone again,but when I turned it on it boot looped again, constantly turned on and off for a while.So I decided to find out why this happens and ultimately wanted to find a solution to fix my phone.

This is how I fixed my Nexus 5X.

1. First of all, there is a need to heat the CPU/RAM chip set for few seconds by using a heat gun or any other favourable equipment.This is necessary , because after the procedure is complete phone should be turned on and boot perfectly for a while. (It needs a start) (Optional)

2. When It cools down, clean the top part of the chip set ( I used PCB alcohol)

3.Apply thermal paste above the chip sets, specially above CPU/RAM chip. (Apply only recommended quantity)

4. I cut the metallic shield that covered exactly above the chip set . So that there would be better airflow and heat sink contact.

5. There were few old PC-CPU fans at my home, so I chose one and removed the metallic sheath beneath the CPU fan, It was very easy to cut,due to it's thinness. [( It provides better heat flow) (Optional). Certain fans have metal like sheath under the heat sink where we usually apply thermal compound)]

hxxs:imgur.com/a/kNNyW

6. I also found an old damaged graphics card at my home, I carefully removed the thermal pad from it's chip set, I felt that it's quality is pretty high as compared to the one LG placed inside the phone .Still I didn't discard the thin LG thermal pad.

After reshaping the thermal pad:

hxx:imgur.com/a/lwOks

7. First I placed the thin LG thermal pad above the chip set, there after I fixed the high quality thermal pad and closed the metallic shield. As you can see thermal pad and metallic shield all at the same level.

hxx:imgur.com/a/jjUiW

8. I made a small Aluminium heat sink like this (0.8mm Copper Shim or thinner is recommended)

hxx:imgur.com/a/xMDVi

9. I applied little thermal paste inside the plastic compartment and fixed the Aluminium plate inside it (Yellow thermal pad from LG was previously here)

10. Again I applied little thermal paste above the Aluminium plate and fixed the metallic sheath that I made from CPU fan.

11. Applied little thermal paste right above the metallic sheath and carefully placed motherboard above it.

hxx. imgur.com/a/8KHC8

12. Reattached screws and cover(Do not apply too much pressure, this step is very important, it might damage the motherboard, If it doesn't fit inside , find whats gone wrong! All materials needs to be thin.), when I turned my phone on first time it turned off suddenly, so I enter into fast boot mode and placed my phone like that for 5 minutes ( I wanted my phone to wake up)

13. Then I again turned on , It booted without any hassles, I tried to play plenty of games, I could feel the heat but never like before. Also it never froze or shut down even after crossing 60 degrees ( Heat suddenly lowers to 40 C even it crosses 50 or 60 )

14. Now my phone is fine running all apps, running all 6 cores more over It works like a new phone which never experienced any boot loops in its life.

:o

I think the core shut itself down due to heat, If heat can pass through some high quality heat sink and thermal pads, Nexus 5 will live again! And none of the cores will shut down again. If its ever shut down it would quickly recover and there will never be a boot loop problem. :good: that's what I learned from this issue.

Performance update after mod (After continuous use);

hxxp.imgur.com/a/8QDD9

hxxp.imgur.com/a/yDVEi

hxxp.imgur.com/a/vaxEk

hxxp.imgur.com/a/Q4XeX

Tested Android 8, 7, and 6 all works, but I personally prefer 7.1.2.