Quelltext der Seite WSAL17916 – 7.9inch HDMI LCD/en

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The 7.9-inch IPS touchscreen with 400×1280 resolution and 5-point capacitive input connects via HDMI to a PC or Raspberry Pi; touch is wired over USB.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL17916 WSAL17916 – 7.9inch Capacitive Touch Screen LCD, 400×1280, HDMI, IPS, Toughened Glass Cover]

== Technical overview ==
* IPS panel with fixed hardware resolution of 400×1280 pixels.
* Capacitive 5-point touch with toughened glass (hardness up to 6H).
* Connections: HDMI for video, USB for touch input; plus a 3.5mm jack for audio output.
* Supported systems: Raspberry Pi OS, Ubuntu, Kali, RetroPie; as a monitor: Windows 11/10/8.1/8/7.
* For Raspberry Pi, add hdmi_group=2, hdmi_mode=87 and a custom hdmi_timings entry to config.txt.
* Screen rotation depends on the OS version (Bookworm/Bullseye/Buster/Stretch/Jessie) via GUI settings, cmdline parameters, or display_rotate.
* Touch rotation can be configured through udev rules (Bookworm CLI), Xorg configuration (Bullseye/Buster), or the physical rotate button on the rear.
* Backlight brightness is adjusted in five steps by long-pressing the ON/OFF button on the back.
* Brightness levels are approximately 300–530 cd/m²; current draw ranges from 470–640 mA.
* Enclosure thickness: touch panel + LCD 7.8 mm; with PCB without components 9.8 mm; with HDMI port 16.5 mm.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
hdmi_group=2
hdmi_mode=87
hdmi_timings=400 0 70 10 60 1280 0 20 10 12 0 0 0 60 0 43000000 3
video=HDMI-A-1:400x1280M@60,rotate=90
display_rotate=1
xinput map-to-output <touch-ID> <HDMI-ID>
sudo nano /etc/udev/rules.d/99-waveshare-touch.rules
ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"
</syntaxhighlight>

== Notes and version constraints ==
* In multi-monitor setups, touch input defaults to the main display only; mapping it to a secondary display requires extra steps.
* USB ports on older PCs may be underpowered; use an external 5 V/2 A adapter at the power port if needed.
* Exact ID values for xinput/xrandr are device-specific and must be determined on site.
* Rotation parameters depend on the OS version; select the correct method based on the installed system.
* PWM backlight adjustment requires soldering work (remove resistor, connect pad to P1); not beginner-friendly.

== Source and revision record ==
* [https://www.waveshare.com/wiki/7.9inch_HDMI_LCD 7.9inch HDMI LCD - Waveshare Wiki]
* Source revision: 105297
* Captured: 2026-09-01T02:44:27+00:00
* SHA-256: <code>0739d07652c9d43a2a640803a922847e0e97257a8b2670ffb693d25179fc3266</code>