When the iPhone8Plus is cold, the camera flash does not light up, or it flashes gently. But flashlights work.

That means there's nothing wrong with the flash. Users can check whether the flash is forced to turn off or whether the automatic mode is turned on and forced to turn off in the camera interface. No matter what photos are taken, they are not bright.

If it is in automatic mode, it cannot be lit in a well-lit place.

Users are advised to turn on the forced flash to try. If it can light up, there is no problem. If it still doesn't light up, there is something wrong with the mobile phone system. It is recommended to restore the firmware through itunes.

If all the above methods don't work, you can turn off the phone and restart it to see if the problem has been solved.

If the flash didn't flash when the test photo was taken before, it may be a hardware failure. If it is within the warranty period, please send the after-sales inspection warranty as soon as possible.

Extended data:

When the flash is fully charged, the synchronous contact of the flash on the camera is connected to the flash circuit.

During the flash, the light emitted from the flash illuminates the subject, reflects from the subject and enters the camera (for exposure) and the flash metering element.

The photometric element quickly converts the light energy into an electrical signal and inputs it into the integration circuit, and then the integration circuit outputs an electrical signal proportional to the light value of the flash lamp; When that light value of the flash lamp meet the requirement of proper exposure

When looking for time, the output electric signal of the integration circuit will make the control circuit trigger the flash stop circuit, thus making the flash go out.

Because the continuous flash time of the flash lamp is very short, the flash metering element used must be a photosensitive element with fast response ability to adjust the light.

According to the different circuit structures, the control modes of automatic dimming flash can be divided into parallel connection and series connection.

Flashlights can be roughly divided into three categories, and their functions and performances are different according to different types.

Built-in flash, the use of built-in flash will cause a lot of consumption of camera power, and the built-in flash does not support various advanced functions of flash.

External flash, usually located at the top of the camera body, and some high-end external flash also provide various advanced functions.

Handle flash, handle flash is often used in photo studios, photo studios, wedding photography studios and other professional places.

Baidu encyclopedia -Flash

Baidu encyclopedia -iPhone 8 Plus