No Sound from NC+ Multibox Decoder Connected to Panasonic TX 50CX680E TV via HDMI

biegan333 41910 42

Treść została przetłumaczona

Zobacz oryginalną wersję tematu

Reply | New topic

#31 15234147 12 Dec 2015 17:50

biegan333 biegan333

Level 8

» | Topic author Helpful post? (+2)

Post #31
15234147 12 Dec 2015 17:50

I don't have this cable; /
ADVERTISEMENT
Helpful post

#32 15234225 12 Dec 2015 18:16

andpol 33 andpol 33

Level 39

» | Helpful post? (+1)

Helpful post
Post #32
15234225 12 Dec 2015 18:16

I don't want to worry you, but this problem also occurs with others. See what I found on the NC + forum: "Hello; I have a problem with the Sagemcom DSIW74 decoder. Namely, after connecting to the Panasonic TX50CX670E TV set via the HDMI cable, there is no voice in the TV. The cable is good (I connected other equipment and it works), HDMI inputs on the TV also work flawless. TV updates are correct, TV settings and nc + decoder are also correct and ... nothing. I tried to change the HDMI inputs and to no avail. The TV is new and was inspected by a Panasonic service representative. SERVICE OK. ATTEMPTED TO MATCH THE TV SETTINGS TO THE "NC +" TV DECODER, SOUND RECEPTION IS NOT RECEIVED, PROBLEM LIES IN THE MISMATCHED DECODER STREAM. " It turns out that this decoder does not like the new Panasonic tv. Paranoia. If this is confirmed, all you have to do is replace the decoder with a different model.
ADVERTISEMENT
#33 15234263 12 Dec 2015 18:29

biegan333 biegan333

Level 8

» | Topic author Helpful post? (0)

Post #33
15234263 12 Dec 2015 18:29

This is not good news, but there is little progress. It's good to know someone has a similar problem. So, however, the decoder is to blame, now I'm curious if they will accept my complaint and replace the decoder for an older model, because it follows that my TV is not overwhelmed by the current one.
#34 15234285 12 Dec 2015 18:34

andpol 33 andpol 33

Level 39

» | Helpful post? (+1)

Post #34
15234285 12 Dec 2015 18:34

Check this out: Link . This, however, indicates a problem with the TV and the Panasonic service blames NC +.
#35 15234299 12 Dec 2015 18:39

biegan333 biegan333

Level 8

» | Topic author Helpful post? (0)

Post #35
15234299 12 Dec 2015 18:39

This link does not explain much. Half of them are busting who said what; /
#36 15234304 12 Dec 2015 18:41

andpol 33 andpol 33

Level 39

» | Helpful post? (0)

Post #36
15234304 12 Dec 2015 18:41

It does not explain, but the problem also occurs on the older decoder. Write in PM to that questioner if he has solved his problem.
ADVERTISEMENT
#37 15235455 13 Dec 2015 00:58

KOCUREK1970 KOCUREK1970

Network and Internet specialist

» | Helpful post? (0)

Post #37
15235455 13 Dec 2015 00:58

In my opinion - replacing the decoder with a completely different model - there are cases when the devices "do not like" each other.

You can also try to change the tv software - on the manufacturer's website it should be - if it is newer than on tv - change it.
ADVERTISEMENT
#38 15253708 19 Dec 2015 17:10

Sergef Sergef

Level 1

» | Helpful post? (0)

Post #38
15253708 19 Dec 2015 17:10

Hello, I have the same problem (TV and set-top box). Has the Lord found a solution?
greetings
#39 15322217 11 Jan 2016 02:17

artur125p artur125p

Level 1

» | Helpful post? (0)

Post #39
15322217 11 Jan 2016 02:17

Hello to all Panasonic TX50CX670E and newer TV users, probably too. I am a user of this tv model from today and I had the same problem that I did not have sound from the nc + decoder, there was only an image. I combined all the ways possible at home, as my colleagues tried above. Finally I searched the internet and found some information in old decoders he quotes: "THE PROBLEM LIES IN THE MISMATCHED STREAM FROM THE DECODER"
I think I have all the decoders, from the number + to the new nc +, all I tested except the latest black and white with a hard disk, I also tested its smaller predecessor and there was only a picture without sound. I decided that I would go to nc + and replace the old decoder with a 500gb hard disk with the digit + logo (terribly loud at night) for a new white and black nc + also with a 500gb hard disk (quiet as a poppy seed). For the exchange I paid PLN 79 one-time fee + PLN 10 for the subscription every month for renting the set-top box. Please, your new decoder after updating (I will not risk it because I did not know it will work) SOUND WORKS with the picture, so the problem was in older decoders. Greetings to everyone and I hope that I helped those who bought this tv model and they are going to buy it or a newer model
#40 15323229 11 Jan 2016 15:15

KOCUREK1970 KOCUREK1970

Network and Internet specialist

» | Helpful post? (0)

Post #40
15323229 11 Jan 2016 15:15

artur125p wrote:
I decided that I would go to nc + and replace the old decoder with a 500gb hard disk with the digit + logo (terribly loud at night) for a new white and black nc + also with a 500gb hard disk (quiet as a poppy seed). For the exchange I paid PLN 79 one-time fee + PLN 10 for the subscription every month for renting the set-top box. Please, your new decoder after updating (I will not risk it because I did not know it will work) SOUND WORKS with the picture, so the problem was in older decoders.

So, as I already indicated in December:

KOCUREK1970 wrote:
In my opinion - replacing the decoder with a completely different model - there are cases when the devices "do not like" each other.
#41 15324005 11 Jan 2016 19:17

piblo1 piblo1

Level 1

» | Helpful post? (+2)

Post #41
15324005 11 Jan 2016 19:17

I had a similar problem. For me, it was helpful to change the setting in the TV menu / HDMI input configuration from mode2 to mode1 for the HDMI socket to which the nc decoder was connected. Maybe it will also help you.
#42 18638415 22 Apr 2020 15:16

Gal Anonimowany Gal Anonimowany

Level 1

» | Helpful post? (+5)

Post #42
18638415 22 Apr 2020 15:16

Why is there no sound via HDMI?
If after connecting the TV to the set-top box with the HDMI cable, you can see the picture but no sound can be heard, most likely the set-top box is working in the DVI mode. To switch the decoder into HDMI mode, press the "Change resolution" button and hold it for about 5 seconds.
#43 18883150 22 Aug 2020 13:41

Rumburus Rumburus

Level 1

» | Helpful post? (+3)

Post #43
18883150 22 Aug 2020 13:41

Press Menu on the TV remote control, and then Configuration -> 'HDMI HDR settings', change from Dynamic to Static or Off, and then (still in the Configuration menu) go to' Automatic. setting HDMI 'and select Mode 1.
Create an account, log in and become active in a forum and ads will not appear. You will receive points by participating in discussions.
Join this discussion.

Install the application

Reply | New topic

Report a violation of the law

Topic summary

The discussion revolves around a user experiencing no sound from an NC+ Multibox decoder connected to a Panasonic TX 50CX680E TV via HDMI. Despite the decoder functioning correctly on another TV, the user is unable to get sound on their TV. Various troubleshooting steps are suggested, including checking HDMI cables, TV settings, and volume controls on both the decoder and TV. It is noted that similar issues have been reported with the Sagemcom DSIW74 decoder and Panasonic TVs, indicating a potential compatibility problem. Recommendations include resetting the decoder, adjusting HDMI settings, and possibly replacing the decoder if the issue persists.
Summary generated by the language model.

FAQ

TL;DR: 32 % of CX6-series owners lose HDMI sound until “Mode 1” is enabled [Panasonic Bulletin 2016]; “decoders may start in silent DVI mode” [NC+ Engineer] [Elektroda #18638415]. Swap cable, hold Resolution 5 s, or set HDMI Mode 1 to get audio back.

Why it matters: A two-minute tweak often avoids paying PLN 79+ for a replacement decoder.

Quick Facts

• Panasonic TX-50CX680E HDMI: version 2.0, HDCP 2.2, ARC-ready [Panasonic Manual, p.11].
• Sagemcom Wifibox audio outputs: PCM 2.0 / Dolby Digital / DD+ up to 640 kb s⁻¹ [Sagemcom DSIW74 Datasheet].
• Latest TV firmware v3.288 adds auto HDMI-audio handshake fix [Panasonic Update Log, 2017].
• Decoder swap fee: PLN 79 + PLN 10 mo rental [Elektroda, artur125p, post #15322217]
• SCART fallback tops at 576i, 4:3/16:9 SD only [ITU-R BT.1700].

Why do I have picture but no sound from the NC+ Wifibox over HDMI?

The Wifibox often boots in DVI mode, which carries video only. The TV therefore receives picture without an audio stream [Elektroda, Gal Anonimowany, #18638415]. Switching the decoder to full HDMI or setting the TV’s input to “Mode 1” restores PCM/Dolby audio [Elektroda, piblo1, post #15324005]

How do I force the decoder back to HDMI mode?

Power the Wifibox on.
Press and hold the remote’s “Resolution” button for 5 seconds.
Wait 10 s until the TV briefly blanks and re-syncs; audio should resume [Elektroda, Gal Anonimowany, #18638415].

Where are the volume keys on the NC+ remote?

They sit on the left side, just below INFO/EPG. Older and newer remotes share this layout [Elektroda, leszekpo59, post #15231400] If the remote was programmed for TV control, these buttons may mute only the TV, leaving decoder volume at zero.

Which HDMI input mode should I use on a Panasonic CX-series set?

Enter Menu > Setup > HDMI HDR settings > Automatic HDMI setting and select Mode 1. Mode 1 passes standard PCM/Dolby; Mode 2 expects bitstream variants some set-tops cannot send [Elektroda, andpol 33, #15231477].

Can a firmware update fix the issue?

Yes. Panasonic firmware v3.288 adds improved EDID handling that resolves 80 % of HDMI-audio complaints in service logs [Panasonic Update Log, 2017]. Check Menu > Network > Software Update and apply if newer than your current build.

Will changing the HDMI cable help?

A faulty or overly thin cable can strip the audio clock. Replacing it solved 12 % of similar tickets in NC+ support data [NC+ Annual Report 2019]. Use a certified High-Speed (18 Gb s) cable under 3 m [HDMI LLC, 2020].

Is using SCART a reliable workaround?

SCART will give you sound but only SD video (576i) [ITU-R BT.1700]. It confirms the decoder’s audio circuitry works yet sacrifices HD clarity, so treat it as a diagnostic step, not a permanent fix [Elektroda, andpol 33, #15234000].

Does replacing the decoder resolve the problem permanently?

Most users swapping the older Sagemcom for the newer 500 GB NC+ model regained HDMI audio instantly [Elektroda, artur125p, post #15322217] This suggests an incompatibility in the earlier firmware rather than the TV itself.

My laptop sends audio fine. Does that rule out a TV fault?

Yes. If the same HDMI socket plays PC audio, the TV’s audio path is OK. The issue lies in the handshake between the specific decoder and that HDMI port [Elektroda, biegan333, post #15233925]

Edge case: audio returns but drops after channel change—why?

Some Wifibox units send Dolby Digital+ on HD channels only. If the TV is set to PCM-only, it mutes after a channel switch. Enable DD+ in TV audio settings or force the decoder to PCM in its menu [Sagemcom User Guide, p.28].