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TV off But Still Has Optical Output


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Old 03-11-2014, 08:37
jhlb
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TV - Samsung PE434500AW UK version.
Connected to Maxell MXSB-252 Soundbar.
This soundbar sould turn off when the TV put into standby but does not.
I notice that if I disconnect the optical out - SPDIF - from the TV, the soundbar succesfully turns off - this is with the TV in standby.

It seems therefore that there is an audio output from the TV even in standby and yes - I can see red light at the socket.

Powering off the TV at the mains supply then reconnecting leaves the soundbar off and I note that at this point there is no light from the SPDIF socket on the TV.

The same symptoms are present if I set the TV to either internal speakers OR external speakers.

What's going on?

J
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Old 03-11-2014, 10:07
SkipTracer
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I have a similar thing with my active sub woofer connected to my AV amp via coaxial cable but although it does not turn off when the amp is turned off it does after about 10 minutes or so, so I assume the circuit is just powered by electricity from smoothing capacitors and once discharged the speaker turns off too.

Have you tried leaving it for awhile to see if it eventually powers down?
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Old 03-11-2014, 10:12
jhlb
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I left it for two hours this morning. Manual says it should turn off after 2.5 minutes.
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Old 03-11-2014, 10:24
Deacon1972
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Not unusual to find the optical out still active when the device is in standby. Normally it's not an issue, it does become an issue though when you connect say an optical switch or a device like your soundbar that requires a complete power down of an input to function as intended.
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Old 03-11-2014, 10:35
Deacon1972
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I have a similar thing with my active sub woofer connected to my AV amp via coaxial cable but although it does not turn off when the amp is turned off it does after about 10 minutes or so, so I assume the circuit is just powered by electricity from smoothing capacitors and once discharged the speaker turns off too.

Have you tried leaving it for awhile to see if it eventually powers down?
Auto on/off on sub's generally work on audio signals, if it doesn't receive a signal within a specific amount of time it shuts down, when a signal is received it powers up.

Just my personal preference but I never used this function, I have known subs in the past to remain in standby when they should be active, probably down to poor circuitry and price.
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Old 03-11-2014, 10:52
jhlb
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Are optical cables prone to external interference?
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Old 03-11-2014, 10:55
chrisjr
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Are optical cables prone to external interference?
J
No. (nice simple answer )
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Old 03-11-2014, 11:03
jhlb
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Thanks for the answers. Looks like I will be using the nasty little remote that came with the soundbar for on/off.
J
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Old 03-11-2014, 11:21
treefr0g
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I have a similar thing with my active sub woofer connected to my AV amp via coaxial cable but although it does not turn off when the amp is turned off it does after about 10 minutes or so, so I assume the circuit is just powered by electricity from smoothing capacitors and once discharged the speaker turns off too.

Have you tried leaving it for awhile to see if it eventually powers down?
Mine does this but in my case it is because the sub has an auto power off that only kicks in when it hasn't received any output from the amp for 10 minutes. It would do the same if the amp was still on but not outputting.
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