Led conversion and inverter boards

[BigBeard]

Hi all,
I am trying to figure out how to replace the ccfl backlight with an led strip in an 8 inch LCD screen. I use these screens in ATM machines.

Firstly, there is not much space in the screen, so the led strip (white light) would have to be relatively thin.

The original screen is powered by an inverter board, which I assume would not be compatible with the led strip, voltage wise, as companies that sell conversion kits use different inverter boards.

Firstly, would I only need to know the power rating and the amperage required for the LEDs to figure out what inverter board I need? Can anyone recommend a site that sells such inverter boards?

The inverter board will draw current from the machines main board. Wiring will be required from the man board to the inverter board, then the inverter board to the led strip...are there any recommended readings on how to place wires in the appropriate connectors, and where can I find those?

I also though about wiring the led strip to a DC adapter, as it seems like it would be much cheaper, as it would not require an inverter board, and it would also bypass machines mainboard. How would I go about connecting this to the adapter.

 

[itsmoked]

Hi BigBeard,

There are WAY to many details required in a task like yours for us to help you on-line.

I can answer some of your questions though.

Yes, you definitely need a different driver than the CCFL used.
You also need far more info than the Volts/Amps of a LED bar to select the appropriate driver.

You likely need to consider thermal issues, main board supply issues, fixturing as in how to mount the LEDs, and protection, to name about 5% of the tasks that you'd need to cover for success.

You really need to hire a local EE who can put hands-on to help you navigate all the issues and make the switch successfully. Whereabouts are you located?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[mcgyvr]

Does the LED strip have current limiting build into it already... (post the datasheet for it)
If so its as simply as plugging it into a DC adapter with a voltage rating that matches the LED strip..

If not you need a constant current driver to provide the current limiting for the LEDs.
Meanwell is my manufacturer of choice for that.

 

[BigBeard]

Thanks for the replies. I am located in westchester county, ny, in the city of yonkers.

I certainly would be willing to employ an EE to guide me through the initial design, as long as the price is cost effective.

 

[daveross100]

Look at

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

how many NIT needed?

this data will help to calculate the needed power from the led strings

Any question : daveross100@gmail.com