Wordpress white screen but won't show errors?

Question

JavaScript

Hello. One developed site fell. As usual, "no one touched anything." This terrible white screen falls out, although I thought that this problem was solved with PHP7. I can't see any errors, neither in the error_log nor on the screen. In wp_config :

define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', true);
define('WP_DEBUG_LOG', true);

prescribed. Moved the site to OpenServer locale. If you make any mistake in index.php, it will be displayed on the screen. I renamed the folder with plugins, changed the theme in the database, increased wp_memory_limit.
Wordpress just doesn't show any errors.
UPD. debug works. for example, if you give an incorrect connection to the database, then an error will be displayed and written to the debug.log
UPD. The question is closed. I found a malicious code.. You can delete the answers if you do not want to spoil the statistics, and I will delete the question

Answer 1

document.getElementById('textbox_id').value
Read

Answer 2

Have you checked caching?

Answer 3

That is, errors are not shown on the hosting?
Well, you can try editing php.ini