First, determine how your Z33 is failing. This will save you time:
Shine a bright flashlight directly at the Z33’s screen at an angle. If you see a faint image, your backlight is dead, but the LCD itself is fine. That’s a cheap, quick fix for any repair technician. How to fix SYMPHONY Z33 black screen
This deletes all your data (photos, contacts, apps). Only do this if you have a backup or don't care about the data. First, determine how your Z33 is failing
If the screen remains black after restarting and charging, the operating system may have crashed. You need to boot into . That’s a cheap, quick fix for any repair technician
If the screen turns on but goes black again immediately, a third-party app is likely the culprit.
: Use a known working wall charger and cable. Allow the phone to charge for at least 30 minutes before trying to turn it on again. Check the Port