When buying a phone, you can inspect the screen for dead pixels or bright spots to see if there are any issues.
Follow these steps to check the screen of Asus Zenfone 4 Max ZC520KL:
Step 1: Download the Antutu app, open it, and select 'Screen test.'

Select 'Screen test'.
Step 2: Choose 'LCD Test'.

Choose 'LCD Test'.
Step 3: Tap the screen multiple times to switch between various colors and check for any unusual points.

Tap the screen multiple times.
Step 4: Completion.

Completion.
This marks the completion of your setup process. Wishing you all the best in your endeavors.