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Q: how to ´mute´ the video on a tv-set? (most simple solution) Answered

hi, i have very little power up here in the cabin and have to watch pretty much any watt. i also watch a bit tv (small set). but most of the time i´d like to use it as a ´radio´ (sound only). is there a quick and dirty way to add the option/function to turn off the video (like i can mute the audio)? a way to configure the remote?, to re-programm a button?, to phyically insert a small switch in the tv-housing?, etc etc?

feedback and any idea, no matter how wild, welcome.

bowing.

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Downunder35m

5 weeks ago

Might be a totally different appraoch but....
If you are just after audio, then why not get a receiver?
You know, these TV set top boxes of the cheap kind...
They usually come with some sort of audio output and don't really care whether or not a TV is actually connected once set up.
Would use less power than a TV and if you get the right box then it also offers a headphone output where you can connect some little PC speakers.

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la xerra

5 weeks ago

jack, the manual for that machine is somewhere in another universe.

i dont understand (much) circuitry, but not understanding stuff never kept me from taking covers off.

i finally ordered a multimeter the other day, but it will get here from china in a couple of months (like in the good old days of the silk-road). will do the wattage test, yes.... but cannot imagine killing-off the video-stream wouldnt bring down the wattage at least by half.

btw, being a meterless critter: whats the difference in used watts between a tv plugged in and on stand-by and turned on?

tv-card etc sounds good, too, except that the s hitty old lapper i got here fries more watts than the tv

and, running tv and lapper at the same time: those are obscene luxuries unknown up here on the mountain. cheers.




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Jack A Lopezla xerra

Reply 5 weeks ago

It is not, "the manual." Typically there are two.

One is called, "user manual," or "manual de usuario." This manual is intended for the end user, and it contains only superficial information, like the location of the on-off button.

The other is called, "service manual," or "manual de servicio." This manual is intended for the person who wants to repair this device. This manual is almost never provided to the end user, because he or she does not want this level of detail; i.e. a manual that shows all the wires, all the different little modules, and their pinouts, and explains what they do.

These days, the easiest, most likely place to find either of those manuals, if they can be found, is online somewhere, as a PDF document.

Anyway... in the likely event you cannot find any manuals, just take the cover off, and take a look at what is in there.

I am kind of hoping what you will find is, a whole bunch of different boards or modules, all connected to each other by wired connectors, like

https://en.wikipedia.org/wiki/JST_connector

https://en.wikipedia.org/wiki/Flexible_flat_cable

So a likely plan of attack is, to try to turn off the display, or the LED backlight for the display, or both, just by unplugging one of these connectors.

I mean if you find a connector which, when unplugged: the display goes black, power consumption drops, audio can still be heard, and also the reverse: when plugged back in the display turns back on...

If you can, in this manner, isolate the function you want to turn off, to just one connector, then from there you can maybe narrow it down to just one wire, and then put a switch in series with that one wire.

Also sometimes the ICs (integrated circuits) performing these functions, can be commanded to shut down, usually with a logic level signal (i.e. 0 volts or +5 volts) on one particular pin.

But to discover a shutdown pin, requires that pin exists, and also requires looking at the data sheets for the individual ICs, and that requires the ICs actually be identifiable; i.e. the tiny numbers printed on them are clear enough to read, and for the data sheet to be available, usually via a place like,

http://www.alldatasheet.com/

So just adding a switch or two, to disconnect-reconnect some wires, might be a lot easier.

Regarding your question about the difference in power consumption between sleep mode and active mode, uh, you know, I am not clairvoyant enough to know what those numbers would be for your TV, but I might try measuring that with my meter, and a 19-inch LED backlit TV, or computer monitor, if I can find one in my collection of junk here.

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la xerra

5 weeks ago

sixsmith, its a *engel*, model led 19, 30 w. and yes, if there is no way to do it without opening the beast up i will sharpen the knife.

(i once had a laptop it got rained on and consequently a few keys on the keyboard got fried. instead of buying a new one i ´reprogrammed´ the broken keys - lets say the *A* key was shot, so i transfered it on a key i never/hardly used - was wondering if, maybe, somethinkg similar was possible with the tv-remote - but then, there is not ´mute´-video to begin with - which, to begin with too, is outrageous - every tv set should come with one - maybe the new once do - no idea - i am a dino). thanks anyhow.

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sixsmith

5 weeks ago

You will need to be more specific as to make and model of the TV and it might be a good idea to include some photos to get the best assistance.
I once took apart a viewsonic monitor in an attempt to figure out if I could convert it to 12V for off grid use, I wasn't able to find out if or where the mains voltage was converted to DC.

putting that aside; if I recall, there is a ribbon wire with a plug going from the circuit board to the screen. one of those wires should be a ground/common/negative/whatever you want to call it. and theoretically, putting a switch on that should turn off the screen, however I am not very knowledgeable on electronics and someone else may be able to comment as to if and why there would be a problem with putting a switch on a negative wire.

You'll have to probe every wire on that ribbon to find out which is the common wire, having a multimeter will be necessary and particularly skinny probes might allow you to check through the plug without having to stab through the wire insulation.
you might also be able to check via the traces on the circuit board where they run into the cable connection.

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Jack A Lopez

5 weeks ago

Find the service manual for this particular TV. If you can find that, it might give you some clues as to how to turn off certain subsystems, while leaving others on.

If you cannot find a copy of the service manual, well, then you just have to take the cover off, and map everything out yourself, which is challenging, and time consuming, if you understand circuits.

If you do not understand what you're looking at, then cross out the word, "challenging," and replace it with, "impossible," because that will more accurately describe your chances of success.

Also you should use a power meter, to confirm that turning these things off actually saves a significant amount of power.

I am guessing you already have power meter, or current meter. I mean in the case that all your loads are DC loads, a current meter (aka ammeter), is kind of the same thing as power meter.

Another possibility might be to replace your TV with a TV card, or TV tuner peripheral, made for use with a personal computer. These days they probably have ones that work over USB.

But that might only save power in circumstances when the TV and computer are going to be on at the same time.