Humax looses sound and picture goes pink.

M

MGMAN239

New Member
Humax 5000t on turning the box on it takes a while to boot up it comes on as normal then occasionally we loose the sound and the picture goes pink and then returns to normal then turns on and off, i have spoken to Humax help line they suggested a Factory reset and a Signal check which i have done and it is around 93 to 95 .
I would be greatful if anyone can throw some light on my problem.
 
Black Hole said:
It would have been informative to post a photo of this. Do you mean the screen is a uniform pink, or is it the normal video with a pink cast?
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At the moment fingers crossed by changing the HDMI cable it’s behaving it’s self but if it plays up again I will post a photo
 
That's odd. Maybe reseating the cable has helped mend a bad connection, but the way HDMI works it should be all or nothing. Audio and video is carried in a single stream of digital data over the same conductors, so video artefacts (rather than intermittent or total loss) must be originated at source or "created" at destination.
 
Black Hole said:
the way HDMI works it should be all or nothing
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That's not true, although there are no conductors dedicated to the transmission of audio only, there are pairs of conductors dedicated to the transmission of R or G or B only, so the loss (or attenuation) of individual conductors can cause a colour imbalance
 
Isn't this a really old problem? I used to get this all the time, especially when the box was recording. HDCP?
 
Ezra Pound said:
That's not true, although there are no conductors dedicated to the transmission of audio only, there are pairs of conductors dedicated to the transmission of R or G or B only, so the loss (or attenuation) of individual conductors can cause a colour imbalance
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I would appreciate a reference to that information. Although there are three TMDS data pairs plus a clock pair, I am not aware that these pairs are specifically dedicated to individual colour channels. Rather, I believe these are "lanes" of aggregated data.

Whether the interface is able to adapt to the loss of one or two pairs (with a commensurate loss of bandwidth) is another matter.
 
tmds-flow.4ddc26b8.png

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some quotes from the link above :-
TMDS is a lot like RGBHV, and much like the analog world we live in today, in that it uses four channels: Red, Green, Blue and Clock
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There are three twisted pairs for Red, Green and Blue, plus a fourth twisted pair for sync
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What you see here should make you feel pretty good because it is very familiar. In the middle, you see the following TMDS channels: 0 (Blue), 1(Green) and 2 (Red).
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Thanks.

I'm not contradicting you, but that article is not an official source, and does not seem to explain how the audio data is added.
 
Black Hole said:
I'm not contradicting you, but that article is not an official source, and does not seem to explain how the audio data is added.
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No you are not contradicting me you are contradicting the guy who wrote the article, I'm guessing that the article only becomes official when you have appoved it?
 
Ezra Pound said:
I'm guessing that the article only becomes official when you have appoved it?
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It would be nice to see some actual specifications instead of just a rambling explanation. By "official", I mean a standards body - nowt wrong with that! What would you take to be official?
 
Black Hole said:
I'm not contradicting you, but that article is not an official source, and does not seem to explain how the audio data is added.
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It gets fitted into the line/field blanking in the time honoured tradition. Similar to how ancillary data gets added to SDI signals (serial digital interface) for pro. kit, or how analogue PAL used Sound-in-Syncs (SiS) on distribution/contribution circuits.
Not surprisingly, start here: https://en.wikipedia.org/wiki/HDMI
 
Black Hole said:
What would you take to be official?
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Page 88 of 276 of the HDMI Spec. Has this

2021-02-21_16.36.52.jpg
The following companies have places their names on page 1 of this document: -

High-Definition Multimedia Interface
Specification Version 1.3a
Hitachi, Ltd.
Matsushita Electric Industrial Co., Ltd.
Philips Consumer Electronics, International B.V.
Silicon Image, Inc.
Sony Corporation
Thomson Inc.
Toshiba Corporation
 
Ezra Pound said:
Page 88 of 276 of the HDMI Spec. Has this
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Yep, thanks, that's much more like it.

Ezra Pound said:
The following companies have places their names on page 1 of this document:
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So?

You haven't said why you think I should consider the article you first referenced as "official", other than it sort-of supporting your view rather than mine.

prpr said:
I never understood why so-called open standards are so closed/expensive to mere mortals.
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So that the standards committee can recoup some of their costs, and/or impose a cost of entry on anyone wanting to join the party who did not contribute to the intial effort. An open standard is one which is available to all - not necessarily free to all.
 
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