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Gateway M 6750 Laptop: Dim screen

Last response: in Laptops & Notebooks
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March 22, 2012 10:35:55 AM

I've been trying to repair a Gateway M 6750 laptop. The screen is dim, but if you hold a flashlight behind it then you can still see what's being displayed.


These are the things I've tried so far:

External VGA output. It works without problem.

Fn + F4, F1. Neither make a difference.

No BIOS settings for screen brightness.

No mechanical lid close switch, and if it is magnetic then I haven't been able to locate it.

Screen replacement. No change.

Inverter replacement. No change. Also tried using the new inverter with the old screen, to no avail.



I bought tested working screen and inverter, so they shouldn't be doa.
I'm at a loss at this point, the only other thing I can think of that could be the problem is the video cable. Any ideas?


a c 571 D Laptop
March 22, 2012 11:24:57 AM

Hello Lawl Attack;

Sounds like a back light problem. But you did get a new screen.

Did the new screen come with it's own back light tube?
Or did you use the one with your old screen?
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March 22, 2012 11:39:39 AM

Both screens have their own back light tube. However, I have not disassembled either screen to examine the back lights themselves.
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a c 571 D Laptop
March 22, 2012 11:51:17 AM

It seems you've done everything but a back light change.
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a c 571 D Laptop
March 22, 2012 11:53:11 AM

Changed screen. Changed inverter. If it's not the backlight (or the motherboard/graphics chip) I can't imagine what else it could be.
And using the external monitor shows it's not the motherboard/graphics chip.

It could be the connections to the motherboard or a wiring/cable harness, I suppose.
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March 22, 2012 12:05:40 PM

Yea, the video cable on this laptop also powers the inverter, but I find it odd that I do still get a fine video picture on the screen. I just don't get the back lighting. Which makes me question if the video cable could even be bad. I don't know if I explained that well so here's a picture:
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a c 249 D Laptop
March 22, 2012 6:58:48 PM

Hi :) 

I own a lappy repair company....

You DID put in the CORRECT screen ??

By correct I mean the exact same model of screen WITH A MATCHING PART NUMBER on the rear of the screen ???

All the best Brett :) 
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a c 249 D Laptop
March 22, 2012 7:45:05 PM

Lawl Attack said:
Here's the screen I purchased as a replacement:

http://www.amazon.com/Gateway-M6750-Laptop-Screen-1280x...

The M 6750 comes with a 15.4" screen, and no mention of a specific model.

Also keep in mind I do get a picture with both screens, just not one that's backlit.

http://support.gateway.com/s/Mobile/2008/Avalon/1015078...


Hi :) 

Lol...now answer my question.....are the MODEL NUMBERS THE SAME on BOTH the old and new screens....

We have had this problem a few times and as a company we decided to put in IDENTICAL number screens and never had the problem again....

All the best Brett :) 
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March 22, 2012 7:56:27 PM

Looking at the back of the screens I would say no, none of the numbers match. There's about four stickers filled with barcodes and numbers per screen though, so I'm not sure which one refers to the model number itself.

I would really hate to have to spend another hundred dollars to get a screen with the same numbers just for it not to work again. ;/
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a c 571 D Laptop
March 22, 2012 7:58:44 PM

It seems you did not get what you ordered? Or was the order fairly generic?
Did you get notified that you were getting a parts substitution?

How did that screen replacement order go down - and what company did you go with?
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a c 249 D Laptop
March 22, 2012 7:59:19 PM

Lawl Attack said:
Looking at the back of the screens I would say no, none of the numbers match. There's about four stickers filled with barcodes and numbers per screen though, so I'm not sure which one refers to the model number itself.

I would really hate to have to spend another hundred dollars to get a screen with the same numbers just for it not to work again. ;/



Hi :) 

If you can put a picture up with those stickers on I can tell you which numbers need to match....

Can you not return the new screen for the correct numbered one ??

It was BRAND NEW of course ??

All the best Brett :) 
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a c 571 D Laptop
March 22, 2012 8:02:35 PM

Ok, maybe another way to go - get a inverter that matches the requirements of the new screen? (but that idea raised the hair on the back of my neck though)

It's kinda looking like the inverter might not match the back light tube requirement.
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March 22, 2012 8:06:05 PM

WR2 said:
It seems you did not get what you ordered? Or was the order fairly generic?
Did you get notified that you were getting a parts substitution?

How did that screen replacement order go down - and what company did you go with?


I ordered it new, off of amazon.com. The part is just a generic screen replacement for a Gateway M 6750. The company I ordered it from was ViewOne Tech.
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March 22, 2012 8:11:42 PM

Brett928S2 said:
Hi :) 

If you can put a picture up with those stickers on I can tell you which numbers need to match....

Can you not return the new screen for the correct numbered one ??

It was BRAND NEW of course ??

All the best Brett :) 


Here are all the stickers from the original screen:



It was sold to me as new on amazon.
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a c 249 D Laptop
March 22, 2012 9:52:43 PM

Hi :) 

The screen number is the bottom right one...

N15412 -L02 REV.C1

15.4 screen obviously from the number....and you NEED to see that number (ALL OF IT) on the replacement screen...

SOMETIMES ...generic screens work...a LOT of times they dont....

All the best Brett :) 
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March 22, 2012 10:08:28 PM

Brett928S2 said:
Hi :) 

The screen number is the bottom right one...

N15412 -L02 REV.C1

15.4 screen obviously from the number....and you NEED to see that number (ALL OF IT) on the replacement screen...

SOMETIMES ...generic screens work...a LOT of times they dont....

All the best Brett :) 


Alright, thanks for the advice. I'll see about returning the screen and getting one that matches the model number.
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March 22, 2012 11:03:20 PM

Best answer selected by Lawl Attack.
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March 13, 2013 4:58:05 PM

DId you ever resolve this? I too have a M6750 and am having same problem. Have replaced with new screen and inverter but it doesn't fix it.

Lawl Attack said:
I've been trying to repair a Gateway M 6750 laptop. The screen is dim, but if you hold a flashlight behind it then you can still see what's being displayed.


These are the things I've tried so far:

External VGA output. It works without problem.

Fn + F4, F1. Neither make a difference.

No BIOS settings for screen brightness.

No mechanical lid close switch, and if it is magnetic then I haven't been able to locate it.

Screen replacement. No change.

Inverter replacement. No change. Also tried using the new inverter with the old screen, to no avail.



I bought tested working screen and inverter, so they shouldn't be doa.
I'm at a loss at this point, the only other thing I can think of that could be the problem is the video cable. Any ideas?




Lawl Attack said:
Brett928S2 said:
Hi :) 

The screen number is the bottom right one...

N15412 -L02 REV.C1

15.4 screen obviously from the number....and you NEED to see that number (ALL OF IT) on the replacement screen...

SOMETIMES ...generic screens work...a LOT of times they dont....

All the best Brett :) 


Alright, thanks for the advice. I'll see about returning the screen and getting one that matches the model number.


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