Hello, there may be the following reasons why the OnePlus 9R cannot activate the fast charge during use:
1. Charger or data cable problems: If the charger or data cable is damaged or incompatible, it may cause failure to activate the fast charge function. It is recommended to replace the original charger and data cable to ensure its quality and compatibility.
2. Charging port problem: If the charging port is dirty or damaged, it may not activate the fast charge normally. You can use a cotton swab to gently clean the charging port and check for foreign objects or damage.
3. Software problems: Sometimes, the software of the device may cause the fast charge to not activate properly. Try restarting the device or performing a software update to resolve a possible software failure.
4. Battery problems: If the battery of the device is aging or damaged, the fast charge may not be activated normally. You are advised to contact OnePlus customer service or technical personnel to repair or replace the battery.
If the above methods can not solve the problem, it is recommended to contact Oneplus customer service or to professional maintenance point for repair.
One is that the power of the charger is not enough, the second is that the quality of the charging line is not good, and the third is that there is a problem with the mobile phone system or hardware.
If the charger power is not enough, you can replace a higher power charger; If the quality of the charging line is not good, you can replace the quality of the charging line; If the phone system or hardware problem, you can try to reset the phone or contact after-sales repair.
This is your phone temperature is too high, in order to protect the phone will reduce the power, so there is no fast charge