the drivers you installed are not compatible with the system you installed previously
。
Solution
：
（
1
）
Use the configured system we provided
；
（
2
）
Install the latest Raspbian system and contact us for the latest drivers.
（
2
）
Didn’t calibrate screen after modifying screen orientation
：
Touch screen function is working well before modifying screen orientation.
Solution
：
After modifying screen orientation please refer Chapter3.1 to calibrate
screen.
（
3
）
Quality issue
：
After installing configured system the touch screen function is still not working.
Solution
：
Please send us an email with your order ID and tell us which Amazon
marketplace you bought this screen. We will send you a new one for free.
4.5.
Performance Issue
（
1
）
This 3.5 inch screen has taken up too many GPIO ports.
Analysis
：
Please use Raspberry Pi extension board to use those GPIO ports(with NC
symbol) taken up by screen (Please refer to the chart in Chapter 1.1 Section (4)
Raspberry Pi GPIOs used by 3.5 inch touch screen)
（
2
）
Arcade game systems like RetroPie
，
recalbox won’t work well on this screen
Analysis
：
3.5 inch screen use SPI buses to communicate and the speed is kind of slow
so the frame rate is not very fast and the image quality is of ordinary level. RetroPie
and recalbox requires HDMI buses communication and fast frame rate. So if you use
this screen with these arcade game system there would be frame drop and not
smooth in playing games.
（
3
）
Multimedia playback center like Kodi won’t work on this screen
Analysis
：
The same reason as above, Kodi system also uses HDMI buses to
communicate while this screen uses SPI buses.
（
4
）
Cannot play HD videos on this 3.5 inch screen
Analysis
：
This screen is a starter screen for Raspberry Pi and has only 480*320
resolution ratio so playing HD videos on this screen won’t be a pleasant experience.
