I am working with AIO-3399J and DM-M10R800
I compiled with rk3399-firefly-aio-linux-lvds.dts
and I checked lcd_pwr_en is high , VDD-CORE is 1.2V , lcd_rst is high, 1.8V
and I checked LCD Board VGH =>5.59V , VGL=>-5.6V
AVDD=>11.2V ,VCC_LCD=>3.2V, LED+ => 4.97V, LED- =>0.0V
But LCD backlight is not working. tured off.
what position should I check?
I want to turn on LCD
1.edit rk3399-firefly-aio-linux-lvds.dts
backlight: backlight {
status = "okay";
compatible = "pwm-backlight";
pwms = <&pwm0 0 25000 1>;
brightness-levels = </*
0 1 2 3 4 5 6 7
248 249 250 251 252 253 254 255>;
default-brightness-level = <200>; => default-brightness-level = <100>;
2.check LED+ of LCD Board
LED+ voltalge should be higher than 11v
when default-brightness-level is 200, 78% duty, LED+ voltage is 4.9v => backlight turned off
but if default-brightness-level is 100, 40% duty,LED+ voltage is 11.4v => backlight turned on
Success!!!!!!!!
Have you fixed it yet? I was playing Chill Guy Clicker and my computer had the same problem as yours. Please help me.
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LCD backlight error, solved! A common issue with a simple fix, often involving replacing the inverter or checking connections. Celebrate the win with a game of Wordle Unlimited to sharpen your deduction skills. Now, enjoy that perfectly illuminated display.
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Make sure the data lines (MIPI, LVDS, etc.) that connect the AIO-3399J to the DM-M10R800 are not broken and are properly linked wordle hint. Look at the connecting pins to see if there are any loose connections or shorts.
Great technical breakdown — you’ve clearly done thorough voltage checks on the AIO-3399J setup. It reminds me of how Remark Construction approaches troubleshooting: methodical and precise. Maybe double-check the backlight enable signal or PWM control line; that’s often the missing piece when all the voltages look right but the LCD stays dark.
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