树莓派3B+外接7寸（1024x600）HDMI显示器无屏显解决方法
本帖最后由 Jason 于 2020-1-12 20:58 编辑树莓派3B+外接了一个7寸（1024x600）的液晶屏幕，通过HDMI连接后，屏幕无任何信号输出。经度娘后发现因为默认参数问题导致无法HDMI输入，现将解决方法进行整理，有问题欢迎大家留言交流。
一、设备
树莓派3B+
二、运行系统
centos7 1908 altarch系统
系统下载链接：http://isoredirect.centos.org/altarch/7/isos/armhfp/
三、解决方法：
1. 首先将树莓派安装了系统的存储卡，通过读卡器连接在电脑上，会看到电脑上新增了三个分区G、H、I，只有G分区可以打开，另外两个无法打开。
G分区：centos系统/boot分区
H分区：centos系统缓存分区
I分区：centos系统根分区
2. 进入G分区，新建一个名为“config.txt”文件，然后文件内增加以下内容：
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2 /1表示CEA分辨率，2表示DMT分辨率
hdmi_mode=87 //DMT分辨率中“87”表示自定义分辨率,还需配合"hdmi_cvt"命令一块使用。
hdmi_cvt 1024 600 60 3 0 0 0
hdmi_drive=1 // 可输入参数<1,2>.2表示音频也通过HDMI一块输出。
config_hdmi_boost=4
3. 保存文件，重启系统即可解决。
提示：
1. centos系统默认以开启ssh，想办法获取到网卡（无线或有线）的IP地址，通过ssh即可登录到树莓派。（centos账号密码：root/centos）
2. 如果非centos系统，而是用的raspbian系统，可以直接修改/boot下的config.txt文件，将以上关键脚本增加在文档最后即可。
CEA分辨率
以下是CEA规定的电视规格分辨率。这些分辨率的hdmi_group=1
hdmi_mode=1 VGA
hdmi_mode=2 480p60Hz
hdmi_mode=3 480p60HzH
hdmi_mode=4 720p60Hz
hdmi_mode=5 1080i 60Hz
hdmi_mode=6 480i60Hz
hdmi_mode=7 480i60HzH
hdmi_mode=8 240p60Hz
hdmi_mode=9 240p60HzH
hdmi_mode=10 480i60Hz4x
hdmi_mode=11 480i60Hz4x H
hdmi_mode=12 240p60Hz4x
hdmi_mode=13 240p60Hz4x H
hdmi_mode=14 480p60Hz2x
hdmi_mode=15 480p60Hz2x H
hdmi_mode=16 1080p 60Hz
hdmi_mode=17 576p50Hz
hdmi_mode=18 576p50HzH
hdmi_mode=19 720p50Hz
hdmi_mode=20 1080i 50Hz
hdmi_mode=21 576i50Hz
hdmi_mode=22 576i50HzH
hdmi_mode=23 288p50Hz
hdmi_mode=24 288p50HzH
hdmi_mode=25 576i50Hz4x
hdmi_mode=26 576i50Hz4x H
hdmi_mode=27 288p50Hz4x
hdmi_mode=28 288p50Hz4x H
hdmi_mode=29 576p50Hz2x
hdmi_mode=30 576p50Hz2x H
hdmi_mode=31 1080p 50Hz
hdmi_mode=32 1080p 24Hz
hdmi_mode=33 1080p 25Hz
hdmi_mode=34 1080p 30Hz
hdmi_mode=35 480p60Hz4x
hdmi_mode=36 480p60Hz4xH
hdmi_mode=37 576p50Hz4x
hdmi_mode=38 576p50Hz4x H
hdmi_mode=39 1080i 50Hzreduced blanking
hdmi_mode=40 1080i 100Hz
hdmi_mode=41 720p100Hz
hdmi_mode=42 576p100Hz
hdmi_mode=43 576p100Hz H
hdmi_mode=44 576i100Hz
hdmi_mode=45 576i100Hz H
hdmi_mode=46 1080i 120Hz
hdmi_mode=47 720p120Hz
hdmi_mode=48 480p120Hz
hdmi_mode=49 480p120Hz H
hdmi_mode=50 480i120Hz
hdmi_mode=51 480i120Hz H
hdmi_mode=52 576p200Hz
hdmi_mode=53 576p200Hz H
hdmi_mode=54 576i200Hz
hdmi_mode=55 576i200Hz H
hdmi_mode=56 480p240Hz
hdmi_mode=57 480p240Hz H
hdmi_mode=58 480i240Hz
hdmi_mode=59 480i240Hz H
H means 16:9 variant (of a normally 4:3 mode).
2x means pixel doubled (i.e. higher clock rate, with each pixel repeated twice)
4x means pixel quadrupled (i.e. higher clock rate, with each pixel repeated four times)
DMT分辨率
以下是计算机显示器使用的分辨率。这些分辨率的hdmi_group=2
hdmi_mode=1 640x350 85Hz
hdmi_mode=2 640x400 85Hz
hdmi_mode=3 720x400 85Hz
hdmi_mode=4 640x480 60Hz
hdmi_mode=5 640x480 72Hz
hdmi_mode=6 640x480 75Hz
hdmi_mode=7 640x480 85Hz
hdmi_mode=8 800x600 56Hz
hdmi_mode=9 800x600 60Hz
hdmi_mode=10 800x600 72Hz
hdmi_mode=11 800x600 75Hz
hdmi_mode=12 800x600 85Hz
hdmi_mode=13 800x600 120Hz
hdmi_mode=14 848x480 60Hz
hdmi_mode=15 1024x76843HzDO NOT USE
hdmi_mode=16 1024x76860Hz
hdmi_mode=17 1024x76870Hz
hdmi_mode=18 1024x76875Hz
hdmi_mode=19 1024x76885Hz
hdmi_mode=20 1024x768120Hz
hdmi_mode=21 1152x86475Hz
hdmi_mode=22 1280x768 reduced blanking
hdmi_mode=23 1280x76860Hz
hdmi_mode=24 1280x76875Hz
hdmi_mode=25 1280x76885Hz
hdmi_mode=26 1280x768120Hz reduced blanking
hdmi_mode=27 1280x800 reduced blanking
hdmi_mode=28 1280x80060Hz
hdmi_mode=29 1280x80075Hz
hdmi_mode=30 1280x80085Hz
hdmi_mode=31 1280x800120Hz reduced blanking
hdmi_mode=32 1280x96060Hz
hdmi_mode=33 1280x96085Hz
hdmi_mode=34 1280x960120Hz reduced blanking
hdmi_mode=35 1280x1024 60Hz
hdmi_mode=36 1280x1024 75Hz
hdmi_mode=37 1280x1024 85Hz
hdmi_mode=38 1280x1024 120Hz reduced blanking
hdmi_mode=39 1360x76860Hz
hdmi_mode=40 1360x768120Hz reduced blanking
hdmi_mode=41 1400x1050 reduced blanking
hdmi_mode=42 1400x1050 60Hz
hdmi_mode=43 1400x1050 75Hz
hdmi_mode=44 1400x1050 85Hz
hdmi_mode=45 1400x1050 120Hz reduced blanking
hdmi_mode=46 1440x900 reduced blanking
hdmi_mode=47 1440x90060Hz
hdmi_mode=48 1440x90075Hz
hdmi_mode=49 1440x90085Hz
hdmi_mode=50 1440x900120Hz reduced blanking
hdmi_mode=51 1600x1200 60Hz
hdmi_mode=52 1600x1200 65Hz
hdmi_mode=53 1600x1200 70Hz
hdmi_mode=54 1600x1200 75Hz
hdmi_mode=55 1600x1200 85Hz
hdmi_mode=56 1600x1200 120Hz reduced blanking
hdmi_mode=57 1680x1050 reduced blanking
hdmi_mode=58 1680x1050 60Hz
hdmi_mode=59 1680x1050 75Hz
hdmi_mode=60 1680x1050 85Hz
hdmi_mode=61 1680x1050 120Hz reduced blanking
hdmi_mode=62 1792x1344 60Hz
hdmi_mode=63 1792x1344 75Hz
hdmi_mode=64 1792x1344 120Hz reduced blanking
hdmi_mode=65 1856x1392 60Hz
hdmi_mode=66 1856x1392 75Hz
hdmi_mode=67 1856x1392 120Hz reduced blanking
hdmi_mode=68 1920x1200 reduced blanking
hdmi_mode=69 1920x1200 60Hz
hdmi_mode=70 1920x1200 75Hz
hdmi_mode=71 1920x1200 85Hz
hdmi_mode=72 1920x1200 120Hz reduced blanking
hdmi_mode=73 1920x1440 60Hz
hdmi_mode=74 1920x1440 75Hz
hdmi_mode=75 1920x1440 120Hz reduced blanking
hdmi_mode=76 2560x1600 reduced blanking
hdmi_mode=77 2560x1600 60Hz
hdmi_mode=78 2560x1600 75Hz
hdmi_mode=79 2560x1600 85Hz
hdmi_mode=80 2560x1600 120Hz reduced blanking
hdmi_mode=81 1366x76860Hz
hdmi_mode=82 1080p 60Hz
hdmi_mode=83 1600x900 reduced blanking
hdmi_mode=84 2048x1152 reduced blanking
hdmi_mode=85 720p 60Hz
hdmi_mode=86 1366x768 reduced blanking
hdmi_mode=87 //表示自定义分辨率，需配合“hdmi_cvt”一块使用
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