This page provides fixes for screen and backlight issues with Oppo A12. Oppo A12 LCD screen might have been damaged if your phone screen has problems like poor lighting or screen not working. It can be repaired by replacing the damaged LCD screen with a working one. However, alternative repair options may be needed if the Oppo A12 screen is flickering, dim or has no backlight.
Oppo A12 with backlight loss usually manifests as a missing LCD screen, resulting in a white screen. Even so, the phone can still make ringing and notification sounds. This suggests that the problem lies with the LCD's backlight and not the phone's audio components.