[Samsung Galaxy Note 9 Questions & Answers] RonChinoy:
I have posted else where on various companies that ran into problems after the Android 10 update. You can find the links if you google. It started first with Pixel phones, because Google phones got the update first. Many articles about the problems faced. As per the last article I read google had as of yet not released a fix. 8 months after the problem started.

In their case it was to do with a partition table for sensor data getting corrupted. So sensors started acting up and eventually failed.

Then it hit Asus phones. Rog2 owners faced problems.

Then it hit Samsung phones. The fun bit here is that it only hit their Exynos phones. Not the Snapdragons.

It hit their Flagship for 2020 S20 the worst with screens turning green.

This leads me to believe that all Exynos CPUs phones where impacted. But as only the S20 phones were still in warranty they focused all their attention on fixing the problem via s/w only for this phone.

See this link.

https://www.androidauthority.com/sa...eiiMQEIXQW51SJYUbXKOox5BC0QDa7aF2N3iHMlTnpYPU

So between the version that caused the problem and the fix they rolled out a lot of our phones saw problems like overheating / slow charging/display / audio issues.

This overheating caused the BGA solder and chips, to over-expand and then when it contracted back down again. The stability of the connection was compromised.

This also explains why the problem appeared then vanished. If you follow the link above you will get an idea of the timeline. Android 10 update comes out. Phones impacted. Samsung releases a fix. The problem is fixed. This is obviously an inhouse effort because google themselves have not yet addressed the issue. Let me dig up the google link I will post it in a bit.

We will know what the issue was when google fixes it. I don't expect Samsung to share that info.

So after the update, the overheating and slow charging problem vanished. But the damage was done.

BGA memory chips have hundreds of interconnects. I suspect the chips which were further away from the cooling pads got the worst of it. Maybe the CPU with its heat sink and water cooling was able to handle the heat. But audio IC with no heat sink could not. Who knows.

Samsung should just replace these devices and then take the failed devices to their plant and do a forensic analysis on the failures. I am sure your phone like mine is mint. i.e. no chance of them saying it was dropped or bumped.

Also water sensors are not tripped. So they must resolve such issues with a replacement. Let them take the board and analyze it. If they do not I plan to do it myself anyway. And will share the finding. The problem is to get the chip off we have to heat it. That will cause the lead to melt anyway. What they need to do is slice the chip off in layers and then analyze the solder.

In most countries, this is a 1-hour job max. Open phone, take off-chip. Clean up. Reball with a stencil. And fix the chip back. But for some reason in India. We do not have this level of repairs being done at least not by people who can be trusted.

My note 4 Samsung, they refused to service because it was purchased outside India.

I gave it to a local repair shop that claimed to have a reballing setup. And he totally botched the job. The phone was returned with parts missing and screws missing.

That is why I went out and purchased my note 9. Even though I hate the Exynos CPU.

This time I plan to do it myself. I build digital circuits for a living. With the right stencil and SMD paste, I see no reason why it cant be done.

I know how hard disks work. Not sure about Nand. i.e. on a hard disk when you format it bad sectors are marked as bad and not used. It could also be a voltage problem. Can't say till it opened up. Or diagnosed.

I am looking for the Schematics if anybody can help. I did find the service manual. But it has no schematics.

Ps: Here is the article I was referring to. I tried to log a complaint with google when it started to heat up. But they have closed the comments on the issue. Finally I expect Samsung to fix this cause I paid them a lot of money. I did not pay google. And BTW one plus phones had no such issue cause they are on the snap dragon.

https://www.androidpolice.com/2020/...d-10-update-issue-which-breaks-pixel-sensors/

Ps: In my case they demanding 26500 is a scam. I have it from their CEO of the service office. In writing.

Here is what the prices should be. These prices seem more in line with prices in China / Malaysia / Pakistan.

https://www.gsmscore.com/samsung/ga...PA2Afv8gXnAORYVCmONeHnX5XG9DCxeqoIJwOiE5EGOB0

And if you want to know the internals of your phone. Here is a link for the service manual.

https://www.mediafire.com/file/bvgv4qjbwagw91s/Note_9_Service_Manual.zip/file

The Samsung Service manual and schematic uses cryptic codes and part numbers for each part.

The was to convert these codes to a part number is to go to this site and search for it.

http://www.samsungparts.com/

Ps: On researching my audio issue. I found this datasheet for the audio IC.

Its max operating temp is 85c. I saw a warning on my screen saying phone is too hot. This log should be saved somewhere.

https://statics.cirrus.com/pubs/proDatasheet/CS47L90_F3.pdf