From the website we know that Lumia 640XL support wireless charging. In order to achieve that you just need to add a appropriate wireless charge receiver.
There are 4 contacts on the back of Lumia 640XL used for wireless charging which are GND, chager, WC_EN, WC_DET as shown in the picture below:
![Microsoft-Lumia-640-XL-Comes-with-Wireless-Charging-Support-483713-2.jpg Microsoft-Lumia-640-XL-Comes-with-Wireless-Charging-Support-483713-2.jpg](https://windowscentral-data.community.forum/attachments/76/76353-9e6d15735d83760dbf3f8415bd76ec0c.jpg)
Coincidentally, there are also 4 metallic contacts on Lumia 920 used for wireless charging as shown in the pictures below:
![2.PNG 2.PNG](https://windowscentral-data.community.forum/attachments/76/76354-c9d40e01e26bb20f26c24ff986c24893.jpg)
![3.PNG 3.PNG](https://windowscentral-data.community.forum/attachments/76/76357-2b0c56c23a420a8a58655b8cf65442c3.jpg)
So I made a attempt to connect them after studying the service schematics of Lumia 640XL and Lumia920. As a result, the wireless charging works successfully. :evil:
![QQ??20150802164552.jpg QQ??20150802164552.jpg](https://windowscentral-data.community.forum/attachments/76/76370-92008799d3432e88432aad076299bc0f.jpg)
![QQ??20150802164510.jpg QQ??20150802164510.jpg](https://windowscentral-data.community.forum/attachments/76/76365-eaaeb9c9de58a36c8eda5968263a43b6.jpg)
![QQ??20150802170418.jpg QQ??20150802170418.jpg](https://windowscentral-data.community.forum/attachments/76/76382-73f130ea34d24027878d55d99a511258.jpg)
The correct connection scheme is below:
![Drawing1 Model (1).jpg Drawing1 Model (1).jpg](https://windowscentral-data.community.forum/attachments/76/76360-a66b1f6fc925a791ed700a20edd22537.jpg)
ATTENTION!!!
Although the wireless charging is working and the back cover can be closed, the wireless charging process is intermittent because of the receiver and back cover are a little thick. So still hope microsoft can drop the official back cover with wireless charging soon!
There are 4 contacts on the back of Lumia 640XL used for wireless charging which are GND, chager, WC_EN, WC_DET as shown in the picture below:
![Microsoft-Lumia-640-XL-Comes-with-Wireless-Charging-Support-483713-2.jpg Microsoft-Lumia-640-XL-Comes-with-Wireless-Charging-Support-483713-2.jpg](https://windowscentral-data.community.forum/attachments/76/76353-9e6d15735d83760dbf3f8415bd76ec0c.jpg)
Coincidentally, there are also 4 metallic contacts on Lumia 920 used for wireless charging as shown in the pictures below:
![2.PNG 2.PNG](https://windowscentral-data.community.forum/attachments/76/76354-c9d40e01e26bb20f26c24ff986c24893.jpg)
![3.PNG 3.PNG](https://windowscentral-data.community.forum/attachments/76/76357-2b0c56c23a420a8a58655b8cf65442c3.jpg)
So I made a attempt to connect them after studying the service schematics of Lumia 640XL and Lumia920. As a result, the wireless charging works successfully. :evil:
![QQ??20150802164552.jpg QQ??20150802164552.jpg](https://windowscentral-data.community.forum/attachments/76/76370-92008799d3432e88432aad076299bc0f.jpg)
![QQ??20150802164510.jpg QQ??20150802164510.jpg](https://windowscentral-data.community.forum/attachments/76/76365-eaaeb9c9de58a36c8eda5968263a43b6.jpg)
![QQ??20150802170418.jpg QQ??20150802170418.jpg](https://windowscentral-data.community.forum/attachments/76/76382-73f130ea34d24027878d55d99a511258.jpg)
The correct connection scheme is below:
![Drawing1 Model (1).jpg Drawing1 Model (1).jpg](https://windowscentral-data.community.forum/attachments/76/76360-a66b1f6fc925a791ed700a20edd22537.jpg)
ATTENTION!!!
Although the wireless charging is working and the back cover can be closed, the wireless charging process is intermittent because of the receiver and back cover are a little thick. So still hope microsoft can drop the official back cover with wireless charging soon!
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