Why does a white screen appear after the transfer of the Bitrix site?

Question

1C-Bitrix

Hello! I transferred the site to VDS, for some reason some of the pages do not work - just an empty white screen appears.
Pages like www.site.ru/contacts work fine, but pages like www.site.ru/services/78 , www.site.ru/news/130 , www.site.ru/products/7 don't work - just white screen.
Here is the .htaccess file:

Options -Indexes
ErrorDocument 404 /404.php

<IfModule mod_php5.c>
php_flag session.use_trans_sid off
#php_value display_errors 1
#php_value mbstring.internal_encoding UTF-8
</IfModule>

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$
RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
</IfModule>

<IfModule mod_dir.c>
DirectoryIndex index.php index.html
</IfModule>

<IfModule mod_expires.c>
ExpiresActive on
ExpiresByType image/jpeg "access plus 3 day"
ExpiresByType image/gif "access plus 3 day"
ExpiresByType image/png "access plus 3 day"
ExpiresByType text/css "access plus 3 day"
ExpiresByType application/javascript "access plus 3 day"
</IfModule>

Answer 1

Are the database settings correct?

Answer 2

Go to bitrix/.settings.php and set the parameter 'debug' => true,
then run the pages "with a white screen", copy and send here the information that Bitrix will give out.