Have you tried cycling through all the ATV3's resolutions?  Press the MENU and UP button (on the remote) for 6 seconds, and the ATV3 will cycle through all resolutions at 20 second intervals.  Press PLAY to keep the one that you want.

Otherwise, it could be an HDCP (high-bandwidth digital content protection) problem - non-HD ready TVs will not usually accept an HD input with HDCP.  The HD audio extractor that I use (for ATV4 into BV26) has the added benefit of stripping out the HDCP, so the TV does not have any problems with the ATV outputs.

(EDIT: This is the extractor that I use: 

I would try another HDMI source and see if it does the same thing.

I had a similar issue with connecting AppleTV to a BV6-23 with the same adaptor - in the end concluded that it didn't have the HDMI board - also what mark of 7-32 is it as others maybe able to help further define the problem.

Is your TV HD Ready? 

http://bogo.custhelp.com/app/answers/answer_view/a_id/2646/~/which-bang-%26-olufsen-televisions-qualify-as-hd-ready%3F

Serial number min. 19135130 or upgraded with a special kit in the past….?

Ralf

Guy wrote:

Have you tried cycling through all the ATV3's resolutions?  Press the MENU and UP button (on the remote) for 6 seconds, and the ATV3 will cycle through all resolutions at 20 second intervals.  Press PLAY to keep the one that you want.

Tried, but it pulsated on everyone of them.

Guy wrote:

Otherwise, it could be an HDCP (high-bandwidth digital content protection) problem - non-HD ready TVs will not usually accept an HD input with HDCP.  The HD audio extractor that I use (for ATV4 into BV26) has the added benefit of stripping out the HDCP, so the TV does not have any problems with the ATV outputs.

My cable is this: https://www.belkin.com/us/p/P-AV10089/ The description says that it would fit to use with for example MacBooks, and it would not have audio in it - does matter? In any case this extractor sounds handy..

Andrew wrote:

I would try another HDMI source and see if it does the same thing.

It was connected with this to Mac Mini, and it did not pulsate. However I could not watch for example Amazon Prime with it, because there was some sort of restriction regarding to the resolution of the setup. Everything else worked but Prime.

kallasr wrote:

Is your TV HD Ready? 

http://bogo.custhelp.com/app/answers/answer_view/a_id/2646/~/which-bang-%26-olufsen-televisions-qualify-as-hd-ready%3F

Serial number min. 19135130 or upgraded with a special kit in the past….?

Ralf

It is less than that I am afraid. I was told earlier that it would be HD-ready. You think this might be the reason for the pulsating? It seems however that ATV has been successfully connected to older models than this or have I misunderstood something?

kallasr wrote:

Serial number min. 19135130 or upgraded with a special kit in the past….?

How to check if it has been upgraded with that kit?

[quote user="Guy"]

Otherwise, it could be an HDCP (high-bandwidth digital content protection) problem - non-HD ready TVs will not usually accept an HD input with HDCP.  The HD audio extractor that I use (for ATV4 into BV26) has the added benefit of stripping out the HDCP, so the TV does not have any problems with the ATV outputs.

(EDIT: This is the extractor that I use: 

I think I have the same configuration,: Apple TV 4  bv7-32! HDMI goes direkt to The DVl plug

I tryed the converter:

https://www.amazon.co.uk/gp/product/B00NAJ4UM2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've got no picture and no sound!

Then I try this converter:

https://www.amazon.de/gp/product/B07FX6C7TP/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

And have a good HD picture and good sound.

TOH wrote:

The extractor has a mini-USB-USB-wire, but no power source was in the package as the guide stated. I tried to connect one, but it had no impact - what is it for?

This USB port is for extern Power and just be connect to a 5Volt powersupply!

Best regards