topic Re: Flashing USB lbackights in Other TVs

Flashing USB lbackights

hollywood1939 — Wed, 09 Jan 2019 17:03:46 GMT

I have just purchased LED backlights for my 40" Sony Bravia TV.

When plugged into either USB port the lights flash continually. This does not happen when plugged into other TV`s or a USB wall charger.

Is this something I can change?

Re: Flashing USB lbackights

LightFoot — Wed, 09 Jan 2019 17:55:38 GMT

@hollywood1939 wrote:
I have just purchased LED backlights for my 40" Sony Bravia TV.
When plugged into either USB port the lights flash continually. This does not happen when plugged into other TV`s or a USB wall charger.
Is this something I can change?

Hi @hollywood1939

What is the model number of you TV? If it has a USB port marked as HDD then this is probably the best as it will have the highest rated power connection.

Also what is the power rating required for you LED backlights?

Re: Flashing USB lbackights

hollywood1939 — Fri, 11 Jan 2019 09:49:22 GMT

Model no. KDL-40WE663. 12 months old still under 5 year warranty.

It has 2 USB ports but both result in the same flashing lights.

This does not happen in my other TV or when I plug the lights into a USB charger.

I wonder whether this is a fault or whether I can change something.

Re: Flashing USB lbackights

The_Black_Rose — Fri, 11 Jan 2019 18:07:42 GMT

Hi hollywood1939,

How many times does the LED flash? Does it flash in red?

Cheers,

The_Black_Rose

Re: Flashing USB lbackights

IamNic — Fri, 11 Jan 2019 18:11:59 GMT

Hello @The_Black_Rose,

the post is about an aftermarket LED-backlight-strip, which @hollywood1939 plugged into the USB-port of the TV, not the status LED of the TV itself.

Hello @hollywood1939,

do you own a USB-power-meter? Maybe the TVs power output is at the lower end of the required capacity.

- Nic

Re: Flashing USB lbackights

hollywood1939 — Fri, 11 Jan 2019 18:18:06 GMT

Thanks for the interest.

The LEDs flash regularly about every 4 seconds. I only have white LEDs.

Re: Flashing USB lbackights

hollywood1939 — Fri, 11 Jan 2019 18:21:55 GMT

Thanks for the interest.

Sorry, I do not own a USB power meter.

The LEDs work OK in every other TV and USB charger I have but not in the Sony.

Re: Flashing USB lbackights

IamNic — Fri, 11 Jan 2019 19:11:33 GMT

Hello @hollywood1939,

@hollywood1939 schrieb:

The LEDs work OK in every other TV and USB charger I have but not in the Sony.

I don't doubt that, yet to me that sounds like the TV can barely supply the lowest level of power needed for the LEDs to function, so they alternate from being on to being off.

Maybe a "Y-cable" which draws power from both USB-ports and merges into one cable can fix this.

- Nic

Re: Flashing USB lbackights

LightFoot — Fri, 11 Jan 2019 20:42:19 GMT

@LightFoot wrote:
@hollywood1939 wrote:
I have just purchased LED backlights for my 40" Sony Bravia TV.
When plugged into either USB port the lights flash continually. This does not happen when plugged into other TV`s or a USB wall charger.
Is this something I can change?

Hi @hollywood1939

What is the model number of you TV? If it has a USB port marked as HDD then this is probably the best as it will have the highest rated power connection.

Also what is the power rating required for you LED backlights?

Hi @hollywood1939

The maximum power rating supplied from your TV’s USB ports is 2.5 Watts. I repeat what is the power rating of your LED backlights? Perhaps the exact model of your LED backlights may help.

Re: Flashing USB lbackights

hollywood1939 — Fri, 11 Jan 2019 22:07:34 GMT

Thanks for your interest.

The LED backlight is 100cm long with 60 white LEDs.

As far as I can tell from the unclear instructions the lights

require 5v@1amp which means from your reply that the TV

cannot supply the necessary power.

Is this peculiar to Sony as the lights work well on other TVs. (Samsung and Logik).

Re: Flashing USB lbackights

LightFoot — Sat, 12 Jan 2019 08:51:46 GMT

@hollywood1939 wrote:
Thanks for your interest.
The LED backlight is 100cm long with 60 white LEDs.
As far as I can tell from the unclear instructions the lights
require 5v@1amp which means from your reply that the TV
cannot supply the necessary power.
Is this peculiar to Sony as the lights work well on other TVs. (Samsung and Logik).

Hi @hollywood1939. The rating is printed next to the USB port. My KD-55XE9305 has three ports, two are marked as 5V 500mA (2.5W) and a third 5V 900mA HDD (4.5W).

Re: Flashing USB lbackights

hollywood1939 — Sat, 12 Jan 2019 11:34:27 GMT

Thanks again.

I have now managed to visibly access the two USB ports.

They each show 5v x 500mA whereas the LEDs specify 5v x 1 amp. No doubt this

is causing the flashing problem. I am looking at a Y adaptor to connect both USB sockets to the lights.

Hopefully this will cure the problem.

Re: Flashing USB lbackights

hollywood1939 — Sat, 12 Jan 2019 11:37:30 GMT

Thanks for the suggestion.

I am in the process of obtaining a Y adaptor cable so will let you know how I get on .

Re: Flashing USB lbackights

hollywood1939 — Wed, 16 Jan 2019 16:45:42 GMT

I have now obtained a USB splitter and this has solved the problem.

Thanks to all who responded to my query.

Re: Flashing USB lbackights

IamNic — Wed, 16 Jan 2019 17:10:49 GMT

Hello @hollywood1939,

glad to hear I could help.

- Nic

Re: Flashing USB lbackights

brattstarr — Thu, 03 Dec 2020 08:21:49 GMT

Did you use a usb y splitter 2.0 or 3.0

Re: Flashing USB lbackights

hollywood1939 — Thu, 03 Dec 2020 11:37:21 GMT

Yes. Had to power from two USB ports to achieve constant light so Y
splitter used.