树莓派我前两个月卖的树莓派，但是连接上屏幕却不显示东西怎么，在线急等啊

既然研究硬件，那就学着调试硬件吧。通电前整机电阻，看是否在正常范围，通电后测各个电压，看哪个不正常

如果是使用hdmi 接口 请在根目录下config文件添加以下内容
disable_overscan=1
hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=35
hdmi_ignore_edid=0xa5000080
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable the lirc-rpi module
dtoverlay=lirc-rpi
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
enable_uart=1
dtoverlay=w1-gpio