iPhone XR Backlight issue – Half Dim and Half Bright

Share:

Malfunction Phenomenon

iPhone XR Half Dim and Half Bright.

 

Trouble Shooting

After we replaced another screen, the malfunction was still the same. Then we opened the schematics to check the backlight circuit. We could see the backlight circuit was similar to the iPhone P series models like 6 Plus or 7 Plus. There were two sets of backlight chipsets, U5650 and U5660, if one of the circuits was broken, half of the backlight LED will not work.

Then the screen could be half dim and half-bright.

 111

 iPhone XR backlight issue 2

 

 iPhone XR backlight issue 3

 

We assembled the screen and turned on the phone, and checked the voltage on C5652 and C5662, normal value should be over 10V, if the value was just around 4V, it means the relevant circuit was damaged.

 iPhone XR backlight issue 4

 

After we checked, we found the voltage on C5652 was abnormal, then we tried to replaced the backlight IC U5660 and tested again, the backlight function was back to normal.

Go to iPhone Motherboard Repair Course to Learn More.

Share:

REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

Advanced Phone Repair Course

Do you aspire to become a professional in the phone repair industry? If so, visit REWA Academy to learn in-depth phone repair from industry experts.

Leave a Reply

Your email address will not be published. Required fields are marked *

RELATED Articles

How to Fix the iPhone 12 Pro Max Touch Not Working

How to Fix the iPhone 12 Pro Max Touch Not Working

When your phone’s screen becomes unresponsive, the usual solution is to replace it. However, screens are quite expensive these days. In this article, we will introduce an alternative method of...

Samsung A53 Won’t Turn On Repair

The Samsung A53 model is widely recognized as one of the most desirable smartphones currently available. However, like all electronic devices, it is susceptible to occasional operational issues that may prove...

Use the Vivo T1 In the Rain and Won’t Turn On

The client uses the Vivo T1 in the rain and won’t turn on after that. Let’s see the detailed troubleshooting and fixing process. Model: Vivo T1 Announced: 2021, October 20 Defect...