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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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 ==
Technical overview of the Waveshare 7-inch HDMI LCD with a capacitive touch panel. The display supports use as a PC monitor and Raspberry Pi connection via HDMI and USB.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL10829 WSAL10829 – 7inch Capacitive Touch Screen LCD (B), 800×480, HDMI, Low Power]
* [https://shop.jw-tech.eu/p/WSAL11302 WSAL11302 – 7inch Capacitive Touch Screen LCD (B) with Bicolor Case, 800×480, HDMI, Low Power]

== Technical overview ==
* Resolution: 800 × 480 pixels at a 60 Hz refresh rate.
* 5-point capacitive touch panel over USB; under Windows the touch function is generally auto-detected.
* Supported operating systems: Windows 7/8/8.1/10/11 as a monitor; Raspberry Pi OS, Ubuntu, Kali, and Retropie for Pi operation.
* For Raspberry Pi use, the resolution must be set manually in /boot/config.txt, otherwise the display may behave abnormally.
* EDID timing parameters: pixel clock 32 MHz, H addressable 800, H blanking 128, V addressable 480, V blanking 45, H front porch 40, H sync width 48, V front porch 13, V sync width 3.
* Power draw: approximately 490 mA with the backlight on and about 90 mA with it off (5 V supply).
* The backlight can be switched on or off using a switch on the rear of the unit.
* To control the backlight via PWM, two resistors are replaced (R80 to 68 kΩ, R59 to 5.1 kΩ, R56 removed); the PWM pad connects to the Raspberry Pi P1 pin.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
hdmi_group=2
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0
hdmi_drive=1
disable_splash=1
gpiodump | grep pwm
gpio -g mode 18 pwm
gpio pwmc 1000
gpio -g pwm 18 X # X = 0–1024; 0 = brightest, 1024 = darkest
</syntaxhighlight>

== Notes and version constraints ==
* The exact pin mapping for the PWM wiring depends on the diagram; verify the current hardware revision before soldering.
* The command “gpiodump” is not present in the source text; only the gpio commands were documented.
* When multiple monitors are connected simultaneously, configure this LCD as the primary display so the cursor can be controlled on it.
* Some PCs detect HDMI devices only after a reboot; insufficient USB power can cause flickering – use an external 5V/2A supply via the DC connector if needed.
* If thin red lines appear at the screen edge, add “hdmi_drive=1” to config.txt.
* If the system does not auto-detect EDID, the listed timing parameters must be configured manually.

== Source and revision record ==
* [https://www.waveshare.com/wiki/7inch_HDMI_LCD_(B) 7inch HDMI LCD (B) - Waveshare Wiki]
* Source revision: 94360
* Captured: 2026-08-30T02:41:15+00:00
* SHA-256: <code>45f5b9c7b0b01651e8ae914f5dba03e19e19109d4b3f93a8fd4fd2293fecce82</code>

WSAL10829 – 7inch HDMI LCD (B)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex