Here i have copie the story HOW TO from Dutch to english
follow this:
Hi everyone,
has had online support know that some people get a picture when they connect their PS4 Pro with their 4K TV. This is due to the compatibility limitations of some TV models associated with 4K and HDR content.
Follow these steps to get your picture on TV:
Start your PS4 Pro in safe mode
Select option 8 [Set HDCP mode] and choose option 2: [HDCP 1.4 only]
The system will reboot automatically when you select OK.
Now you should see a picture on your TV, but it is possible that some content is not 4K or HDR when HDCP 1.4 is activated. Contact your TV manufacturer for more information about the compatibility restrictions. This can occur with some Sony, LG and Philips models.
If you still do not have a picture or are you sure your TV supports HDCP 2.2, follow these steps that will take approximately 5 minunten:
Close your PS4 Pro by holding the power button down until you hear a 2nd beep. Start your PS4 Pro now in safe mode.
2. Choose ni Option 2: [Edit resolution]. You will be prompted to reboot the system and select a resolution.
3. Once the system restarts, select "2160p - YUV420 'resolution. Now you should see your image on TV.
4. Reconnect off the PS4 Pro and restart one last time in safe mode.
5. Select option 8 [Set HDCP mode] and then one option [Automatic].
If you're still having problems with these steps, please contact the manufacturer of your TV for more assistance.
If you can get image to activate your TV without HDCP, but you will try not 4K or HDR image, this:
Make sure you are using the correct HDMI port. Most 4K screens have a specific HDMI port for 4K resolution. This infomation can be found in the manual of your screen.
Make sure that all HDMI cables between your PS4 Pro and TV have HDMI high speed cables (v1.4 +). The HDMI cable is suitable provided with PS4 Pro.
Check the settings on your TV or UHD Colour 'on' (not applicable to all screens)
Make sure that the content you are playing 4K and supports HDR. Some games you need to activate or 4K HDR via the settings in the in-game menu.