Burning TV Risk: Adding 1m RGB 5050 LEDs, 5v-12v Converter, USB Power - Hobbyist Inquiry

Question

Hello. Since I am not quite experienced and I am a hobbyist in the field of electronics, I have a question. I would like to add 1m RGB 5050 LEDs (45LED RGB / 1m) for the TV, although I do not have a 12v power supply. I would like to use the built-in USB port on the TV and the 5v-12v converter. I...

Anonymous · Answer

The given controller data is its maximum load of 12V / 6A. A meter of LED strip will rather consume less electricity.
A 12V / 2A power supply can be purchased at an auction below PLN 10. Is it worth the risk of damaging the USB port on the TV set or even the TV set for that amount?

oskar777 · Answer

Give the TV model, maybe it is written in the documentation what the performance of this USB port is. Probably a colleague may be right.

maxipalia · Answer

If the USB port has a formal symbol (this funny badge) it must comply with all the requirements of the organization, which means it must be protected against overload. Possible damage may be the basis for warranty claims.
This is a paraphrase of the opinion of an expert from around 2000

Maybe someone who still does on the site has more recent knowledge

Regards

Anonymous · Answer

It is different to connect, for example, a USB stick or an external disk that meets certain norms and standards to such a USB port, and a made in DIY power supply is different. With this kind of constructions made sloppy, it worked easily to short-circuit and damage the port or the entire TV set.

DawideuU931 · Answer

There will be no short circuits, but who knows .. The only thing I know about the TV is that it is the LG 26LK330, and the USB input has this wheel with this badge, which has 3 lines. MCR62 and a string of numbers write above the port. Apparently, you can burn the motherboard in the same way in a computer.

maxipalia · Answer

I totally agree, it's different ... But according to the USB (USB-IF, Inc.) standard www.usb.org Each (socket and plug) device bearing the logo must meet the requirements, i.e. also withstand the cutting / breaking of the cable. As for computers, asus boards that I had as well as the current intel are completely protected and disable the port in the event of overload, as LG did, I do not know and do not urge. I have a suggestion for the author of the post ... If you want LEDs to turn on together with the TV: plug the power supply of the relay coil into the USB port and steal the power supply from the TV power cable and through the relay straight to the correct power supply. Just don't forget about the protection diode at the relay coil. Regards you're welcome

DawideuU931 · Answer

I just want it to be quite easy to do, and I don't have a power supply, and I don't want to spend a lot on making 1m of lighting; d So you do not recommend connecting this Do It Yourself led strip to a TV that has already run out of warranty?

Freddy · Answer

No, because no one really knows the maximum capacity of the USB socket on the TV.

Anonymous · Answer

I don't know if a dozen zlotys for a 12V / 2A power supply at auction is a lot in relation to the price of the TV, which can be damaged. An example of current consumption for 1 meter of RGB 5050 LED strip for 60 diodes on 1 meter of strip is 1.2A. For 45 diodes of this type, a current of about 0.9A can be assumed. I don't know what is the current efficiency of the USB ports on this TV, but often if you want to connect, e.g. an external disk to the USB port, you need to power it from two USB ports (there are disks factory-adapted to this type of power supply), because the current efficiency of a single USB port is too low . Of course, this applies to USB-powered drives. For this you want to increase the voltage from 5V to 12V using a converter, and the efficiency of such a converter is not 100% but less. If the USB port performance is 500 mA, then for the voltage at the 12V / 1A converter output you need approximately five times more energy than at the converter input, which efficiency is below 100%. This is unrealistic to achieve in practice. The power of the USB port for 5V and 500 mA is 2.5W, and you need, for example, 12W (12V / 1A), i.e. 4.8 times the amount of energy at the converter output, which efficiency is lower than 100%. This is not perpetual motion. The easiest way to connect these diodes to the plug-in power supply. I don't know what controller you have for this tape, but most of them have a remote control to control the colors and lighting effects of the tape and turn it on, so I wouldn't have anything to do with connecting to the TV's USB ports. You could think of a simple twilight switch when you turn off the light in the room or dim it (if you watch TV with the light off or dim) then the TV backlight automatically turns on.

endymion · Answer

The standard USB socket has a current efficiency of 500mA and is completely resistant to short circuits and overloads.
Counting quickly 5V x 0.5A gives us 2.5W which is not enough to power a typical LED strip.
The best solution will be suggested by a friend @maxipalia .

Burning TV Risk: Adding 1m RGB 5050 LEDs, 5v-12v Converter, USB Power - Hobbyist Inquiry

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