Hello! If you've already replaced the speaker on your Oppo A7 and you're still not getting any sound, there are a few things you can try:
1. Check the volume: Make sure the volume on your phone is turned up and not muted. You can check this by pressing the volume up button on the side of your phone, or by going to Settings > Sound and adjusting the volume from there.
2. Check the media you're playing: Make sure the media you're trying to play (e.g. music, video) isn't muted or paused. If you're using headphones, make sure they're plugged in all the way.
3. Check for software issues: Sometimes, sound problems on a phone can be caused by software issues. Try restarting your phone or performing a factory reset (make sure to back up your data first) to see if that resolves the issue.
4. Check for hardware issues: If none of the above solutions work, there may be a hardware issue with your phone's audio components. You may need to take your phone to a repair shop or contact Oppo customer support for further assistance.