LED Displays on the E6400 Do Not use Inverters Correct?

Well got my third E6400 and third unit that had a CCFL from the outlet when ordered a system with LED. Got a hold tech support
they overnighted a new screen T661h which is a CMO. Bezel a RK149 and a Y793H assy back cover which has a inverter. So the LED Display absolutely do not use an inverter correct?

Dennis

 

Colored LED backlighting is most commonly used in small, inexpensive LCD panels. White LED backlighting is becoming more common. ELP backlighting is often used for larger displays or when even backlighting is important; it can also be either colored or white. An ELP must be driven by relatively high voltage AC power, which is provided by an inverter circuit. CCFL backlights are used on large displays like computer monitors, and are usually white in color. These also require the use of an inverter and diffuser.

or
http://www.pacificdisplay.com/lcd_backlights.htm

 

I appreciate your imput but it did not answer my question which is Does Dell use an inverter with some of its LED display on the E6400 Latitutes ? The back assy sent to me had an inverter on it.

 

I believe LED displays do not require inverters whatsoever. CCFL displays, on the other hand, do.

I found the Dell part #s for what you got. T661H is the WXGA LED CMO display (without inverter). The RK149 though is the bezel for the CCFL LCD with camera+mic, and Y793H is the LED WXGA back cover.

I'm now a little confused. You have the LED display and the LED back cover, but the CCFL bezel? And the back cover has an inverter in it? When I got a replacement back assembly for my LED, it didn't have anything besides a small chip in the bottom left corner which is the board for the ambient light sensor, etc. The inverter, if you do have one, runs on the bottom of the assembly, about where the Dell logo on the bezel would be.

If you're trying to get a LED display, first, complain that you got the wrong bezel (the correct one I believe is WT207).

 

Yes that's what I have and I've been going through this for a month now. The Y793H I looked up with the same results you got, but yes it has a inverter on the bottom and looking closely
stamped into the plastic of the back assy barely visible it says
CCFL....hmmmm. the T661H display has a small ribbon connection I'm assuming goes to the inverter. The display I have, they suppose to replace, is also a Privacy Screen option the T661H is not but I guess I don't care as long as I get a darn LED WXGA display.....man this is getting unreal. Oh your right I don't know whats up with them sending me a CCFL Bezel.

 

are you kidding me? you still havent gotten an LED after 3 tries? thats ridiculous.

 

Of course the LED will have an inverter. They dont run on 5 or 18V, and they are driven with constant current. The most efficient way to do this is with an inverter. Even decent LED torches use an inverter.

Its not a high voltage inverter like one for a CCFL, but its definitely an inverter.

 

Now that's interesting I'm a noob to the LED Laptop screens. The inverter looks to be about half of the size of what the CCFL ones are and don't generate nearly as much heat. I was under the impression the LED don't use a inverter, I probably got that info from these forums. I thought they used PVM not a constant current? By the Dell logo on my D620 it gets pretty warm even hot on this E6400 system its only slightly warm. This unit is also only slightly brighter then my CCFL D620 I thought they were suppose to be seering bright? The Display in my E6400 is listed as a LGD0000 in the Hardware ID LG Phillips i suppose the one they sent is T661H a CMO. So are you sure LED use inverters and if so why to folks here have LED screens without them?

 

No one is knowledgeable about this? Who has taken apart a display here?

 

I can say 100 percent that the E6400 Dell Latitude does not feature an inverter when an LED display is used. I have changed out a panel in an E6400 featuring a LED LCD. If you have further questions, I will be pleased to answer them.