Hello, I’ve been having an HDMI-CEC problem for months now. My TV is a Samsung UE40D5700RS and I use the Z11 Pro Max as my set-top box. A few weeks ago, the HDMI-CEC function was still enabled on both the TV and the Z11 Pro Max, but as I’ve been experiencing the problem more frequently where my TV kept switching on and off constantly – presumably because it was receiving an incorrect signal from the Z11 Pro Max – I’ve just disabled it permanently. I followed these steps to clear the HDMI cache on the TV: 1. Disconnected the HDMI cable from both devices. 2. Unplugged both devices from the mains. 3. Waited for 2 hours. Unfortunately, the problem still persists and I’ve really had enough of it. Yesterday, the TV didn’t switch itself on and off whilst I was watching it. And today it’s causing problems again. Is there a bug in the HDMI-CEC function on the Z11 Pro Max that keeps sending the wrong signal to the TV?
HDMI-CEC problem
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- Z11 Pro MAX
- Help
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DDSB13 -
June 17, 2026 at 10:34 PM
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- Official Post
Hi,
do you use original hdmi cable from the box?
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Hi,
do you use original hdmi cable from the box?
No, a ‘Silvercrest’ brand HDMI cable. The problem persisted even after changing the HDMI cable and the HDMI port. Something happened just now that had never happened before. This time, the TV simply switched off completely. After switching the TV back on, the problem with it constantly switching on and off started again.
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- Official Post
Not sure and its just guess, it could be also your TV and bad handshake, like i told just a guess. You can try to do factory reset, setup fresh again and see if the issue goes away.
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Silvercrest is a LIDL homebrand (low cost supermarket). Not a brand I would recommend for a ICT mission critical component.
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Friend, I think you should buy a good HDMI cable because there are some things where you shouldn't skimp. A supermarket HDMI cable??
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Not sure and its just guess, it could be also your TV and bad handshake, like i told just a guess. You can try to do factory reset, setup fresh again and see if the issue goes away.
I reset the TV to its factory settings the day before yesterday, but unfortunately that didn’t sort out the problem. I left the TV switched off for several hours to clear the HDMI cache. I then used a different HDMI cable to connect the TV and the TV box. I switched both devices on at around 5.40 pm today and tested them for about two hours, and didn’t experience the problem in question. A short while ago, I switched both on again to watch the World Cup match between the USA and Australia, and less than two minutes later the TV switched off and on again. So it’s not down to the HDMI cable. Google Gemini says that other Formuler owners are also experiencing this problem, and that Formuler have already released firmware updates to address it, but these don’t seem to have fully resolved the HDMI-CEC error yet.
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Silvercrest is a LIDL homebrand (low cost supermarket). Not a brand I would recommend for a ICT mission critical component.
Yes, obviously it’s not a premium brand, but I don’t think it’s right to pay €20–30 for a 1.5-metre HDMI cable from an electronics shop either. Incidentally, the interference isn’t caused by the Silvercrest HDMI cable.
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Friend, I think you should buy a good HDMI cable because there are some things where you shouldn't skimp. A supermarket HDMI cable??
My test today showed that it isn’t down to the supermarket’s HDMI cables. You can also find electronic devices in supermarkets – though they’re not always of good quality – purely for information purposes. The Silvercrest HDMI cable is now more than 11–12 years old and has been used for several hours every day; as already mentioned, it is not the culprit.
