树莓派用HDMI连接电视显示”无信号”问题

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2019-10-16

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试了很多次,用HDMI线把树莓派连接电视机,但每次都显示“无信号”。所以搜索了一圈,下面是解决方案。

参考树莓派官网论坛:HDMI monitors says NO SIGNAL (solved)

The Pi outputs a relatively weak HDMI signal. Some devices may not immediately notice the Pi’s HDMI or may not do the negotiation.
Setting the hdmi_force_hotplug=1 makes sure the Pi believes the monitor/TV is really there.
You might also need to set config_hdmi_boost=4 or even higher (up to 9) if your display needs a stronger signal.
If the display is a computer monitor, use hdmi_group=1 and if it is an older TV, try hdmi_group=2.
Do not set hdmi_safe=1 as that overrides many of the previous options.
Using a shorter or better quality HDMI cable might help.
Make sure your Pi’s power supply delivers 1A and not 500mA.
If you see a problem with the red colour – either absent, or interference – then try a boost. However it might simply be that the display requires a stronger signal than the Pi can give.

主要方法是:

  • 拔出树莓派的SD卡,然后插到电脑上
  • 找到SD卡根目录的config.txt文件,打开编辑。
  • 找到#hdmi_force_hotplug=1这句话,把前面的#注释符号去掉,启用HDMI热插拔功能。
  • 找到#config_hdmi_boost=4这句话,把前面的#注释符号去掉,启用加强HDMI信号。

image

如果还是有问题,那么可以试着这么操作(不推荐):

  • 找到#hdmi_group=1这句话,把前面的#注释符号去掉,把数字改成2,强行指定显示器类型:1是连接老式电视,2代表连接新电视。

用HDMI插上电视后,就连声音都有啦!(不用插音频线,HDMI自带音频传输)

作者:Solomon_Xie