Hi, does an LED LCD laptop screen have an inverter or are inverters only fitted to non-LED screens?
Thanks, Ron.
Thanks for your replies.
Yes, I am havng problems with mine.
I think the backlight isn’t working but the display is still working as I can just about read it using a torch.
I’ve taken off the bezel and found a long thin pcb under the screen which I assumed was a power inverter. From your link it looks like an LED inverter. Does anyone know how I can test the screen and/or inverter to work out which one is broken?
Thanks, Ron.
Chris,
Thanks.
It’s an Acer Travelmate TM8371-353G25n with 13.3 HD LED LCD.
Unfortunately, out of warranty – 18 months old.
Chris,
Thank you for your time, help & advice.
I will give that return under the EU Directive a go.
Regards, Ron.
As LED’s don’t need the high voltages of a Cathrod lamp and LEDs require a DC voltage, I wouldn’t expect any LED backlit screen to require an inverter.
I’m 99% sure that they won’t have one.
[Edit]
After Steve K’s link, it looks like there are some uses of some sort of inverter. But the definition of an inverter is to convert a DC voltage to AC. The Dell one he links to appears to be missing the coils used in all other cathod high voltage inverters. I’d hazard a guess that it is more likely a controller board for the brightness of the screen, and not an inverter per se, yet using the same name for historic reasons (such as a flash drive being called a usb disk – it’s not a disk). At least, nothing like a standard Cathod lit back screen inverter.
The small number of LED inverters in his google search compared to a generic Laptop Screen Inverter also highlights that they are very rarely used in LED back lit screens – even though LED back lights now account for almost all laptop screen lightening.
If it’s a true inverter your meaning, then no, an LED runs only on DC. If it’s anything that joe blogs would call an inverter, be it some sort of controller board or whatever, then yes you can say it has one.
Here is a link to more information regarding it. States that LED lightening does not require an inverter.
http://www.pacificdisplay.com/lcd_backlights.htm
Regards, Chris.
[Edit: After your added information]
What make and model is your laptop. Indeed, the LED controller board could cause that problem. Is it still under warranty? If not, replacing this board would be relatively cheap way to check if it is at fault. They can usually be found cheap enough on ebay.
Also, as long as you are 100% sure that it is indeed an LED back lit display, the output voltage is low enough to put a volt meter across – don’t attempt this if it is any sort of other back lit display. You can do this to check if it is indeed faulty. Check also that their is a supply voltage getting to it – should be between 5 and 12 volts depending on the design.
Apologies if my previous edit sounded an bit unfriendly – I wasn’t aware that you were looking for help, as opposed to technical information. But factually, for Ajax and everyone elses sake, this is not an inverter if it is LED back lit screen. It only controls the rate at which the back light is turned on and off in order to provide percieved brightness when used with LED back lightning – it doesn’t provide AC voltage (AC being a reversing direction of current) nor does it step up the voltage for the likes used in Cathod backlights.
[Edit again... lol]
Right Ron,
I’ve not been able to find the board on ebay or anywhere else. But, If you live in the UK, I have a little known idea that I’ve used myself with a mobile phone. Under EU law, your intitled to 2 years warranty. The main problem is that most companies don’t know too much about it, but, a firm and concise letter to their complaints or legal department will almost garantee a replacement or repair in your favour.
You can read more about it here:
http://www.thisismoney.co.uk/bargains-and-rip-offs/tips-and-guides/article.html?in_article_id=487339&in_page_id=53954&in_advicepage_id=131
If you aren’t in the EU, then I appologise that is isn’t much used to you and the only alternative it to get it repaired elsewhere if you can’t find a new board (be sure to check that it is a fault if you can).
If your going to go for this two year warranty thing, then get your laptop back together, looking like it’s never been opened up. Obviously, don’t tell them you’ve had it opened. Play dumb.
Hope that’s more of a help to you. And please do try this as it does work.
Cheers, Chris.
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