Das Problem scheit nicht bei den Enpfangsgeräten sondern offensichtlich bei der TV Box zu liegen.
Ich habe das bereits in einem andern Thread diskutiert.
Ich habe einen brandneuen Pioneer Receiver und da funktioniert es auch nicht. Der Importeur hat das
Signal der STB geloggt und an die Pioneer in Japan gesendet. Hier ihr Feedback:
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"According to the HDMI log, it seems AV Receiver receives a signal from STB, then AV Receiver outputs the signal
to TV, but the signal from STB changes, and then AV Receiver stops the output.
After that, these behavior are done repeatedly.
Unfortunately, we can't identify why the STB changes output signal, but we assume HDMI 2.2/1.4 authentication is related to this.
In addition, according to your information, this symptom does not occur when HD Fury Integral is connected between the devices.
Regarding this, we expect AV receiver works with HDMI 1.4. at that time.
(If) so, we'd like to recommend you to try to connect the STB to HDMI IN 3, 5 (front), 6 or 7 terminal.
This is excerpt from Service Manual, but you'll find HDMI IN 3, 5, 6 and 7 terminal is connected to IC1602 via IC 9602.
Only HDMI IN 1, 2 and 4 support HDMI 2.2, depend on this.
So, if you connect the STB to HDMI IN 3, 5, 6 or 7 of AV Receiver, the symptom may be improved because it works under HDMI 1.4. Since the TV is 2K resolution type, we think there is no problem about this situation. Of course, the symptom may not be improved.
We are very sorry, but we can not proceed to investigate further unless we know why the STB changes output signal, and can not identify it by the HDMI log."
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Offenbar gibt s viele Probleme mit der STB und UHD... es wäre an der Zeit, wenn Swisscom hier endlich eine Lösung liefern würde, oder sich zumindest dazu äussert und die Behebung offensiv angeht.