How to remove the white screen problem in Bitrix?

Question

PHP

There is SMS Bitrix, transferred to another server, white screen. Moreover, if you put invalid characters in the dbconn file, then nothing changes, perhaps it doesn’t even reach the database.
What can be done, at least in order to see the errors?

Answer 1

It's strange to answer my own question, but I figured out what the problem is. And it consists in:
Just display it (if you have the same situation) and you will understand that the system files simply do not connect.

Answer 2

Edit the file /bitrix/php_interface/init.php - write the following code at the top:
If the problem is incompatibility of some custom functionality - it will give errors where (looking for Fatal)
If not - then the problem is in the core and take into account the answer of the author @DiazMoS

Answer 3

I recommend uploading a clean Bitrix CMS to the hosting and trying to install it. During the installation process, you will be shown that the hosting does not meet the requirements of the CMS.

Answer 4

In dbconn.php we write:
ini_set("memory_limit", "512M");

Answer 5

It helped me to comment out everything in the .setting_extra.php file