本人也是索尼用户，昨天手贱升级的8.0，我也是服了，当时和你们一样问题，win10投不了，然后我就去找客服，没卵用。。。
捣鼓半天，客服给我发了个链接，让我手动更新固件。
这个是官方（中国索尼官网）发布的更新日志，居然移除DLNA/WIFI DIRECT ?? 当时看到我就发飙了，人家升级都是有新功能，索尼这玩意怎么越更新功能越少？ 问了客服半天，说不出个所以然，就一直回答，我们没有删除DLNA功能。


后来我怎么办的，我去翻国外sony升级日志了
Features No Longer Supported

1. Certain categories no longer appear when using the DISCOVER button (2016/2017 model):
Although these apps are still installed on the TV, their categories no longer appear when the DISCOVER button on the remote control is pressed. To access the apps, please use (Apps) in the Home menu instead.
Streaming channels
Netflix
YouTube
PlayMemories Online
Video (Home network)
USB remains the same, Video (USB).
For home network, select Video app from (Apps) in the Home menu

2. PlayMemories Online
The PlayMemories Online service, originally included in the Album app, is no longer available.
(Applicable countries/regions: Australia, New Zealand, India, Singapore, Hong Kong, Taiwan)

3. Live Football mode (2016/2017 model)
Live Football mode is removed from the Action Menu. Sports in Picture mode/Sound mode is suitable for watching football or other sports.

4. Wi-Fi Direct full-time standby function
Wi-Fi Direct no longer supports the full-time standby function. It connects only when the TV is in the Wi-Fi Direct standby screen.

5. IPv6 setup
IPv6 On/Off setting is removed. The TV now automatically supports IPv6.
6. Removal of the Assamese and Oriya languages from the language setting (2016/2017 model)
Among the languages of India, the Assamese and Oriya languages are removed. The previous setting of these two language choices will automatically be changed to English.


砸门主要看第四条， 大意是，不再支持全时了，啥意思，就是你电视上得打开屏幕镜像app，才能使用Minacast进行屏幕镜像。
但是dlna没有提及。后来经过测试，索尼电视不能在wifi链接下，dlna放视频。如图
后来我改用了网线链接，成了。。




解决方案2：
电视上装个乐播投屏（我不是打广告，不晓得有什么更好的软件），可实现wifi以及网线环境下的dlna，以及airplay。 windows下如果屏幕镜像需要另装软件（差评）。 最大缺点：乐播不能快进快退，不能远程控制，而索尼自带的dlna可以。


自己取舍吧，选用哪个 。。 其实用有线无线没太大区别，我这个电视鸡肋百兆网卡，又不晓得怎么root，没办法兼容usb千兆网卡，暂时没辙，去外国论坛翻翻没找到什么转千兆网的办法。。


注：
2. Newly added supported formats
The following formats are added as supported formats for USB or home networks.
Photo: .arw (files for simple playback only)
Music: .ogg, .aac
Video: .mkv (VP9 Profile 0, Profile 2), .webm (VP9 Profile 0, Profile 2)
External subtitles: .sami, .txt
Playback capability depends on home network server specifications.


这次8.0更新，dlna可以播放mkv视频啦~
不过在我测试中，索尼自带的dlna 放比较大的文件mkv会没声音（但是可以控制进退）， 乐播有声音但是不能快进快退。


一切安好~~