Replaced laptop screen cable now screen not detected

[bodazephyr]

Hi, I am new to the forums so hopefully this is the right place for this

I had a job come in that is a Dell Inspiron 1764 laptop. the screen would flicker every once in a while so i pulled it apart and noticed the cable to the screen was bad at the hinge. So i took it out and ordered another cable.

I installed the new cable and right away the screen wasnt coming on or even booting. So I then plugged the video out port to an external monitor. The computer will only boot I guess when it detects a screen. So when i boot it with an external screen it comes on fine.

So i thought maybe the NEW cable was bad on arrival so I put the old cable back in.... same thing... wont boot.

I have updated my bios thinking there was a problem with bios detecting the screen but hasn't fixed it. As far as I can tell the screen is fine but I REALLY dont want to buy another screen if that is not the problem. Please please please if you have any idea what would cause a screen to not be detected by the laptop. Or how to test the screen. Its an LED screen btw and I dont really have a parts laptop with an LED to test it.

 

[NETWizz]

Maybe you damaged the screen OR both cables are simply bad.

I would try a new cable first direct from Dell not some Fly By Night Craig's List company.

 

[14049752]

Are you sure that the screen is actually out and not just the backlight? On those LEDs, if you're not careful to remove power (and sometimes let it sit for a few minutes) you can blow the fuse on the motherboard to the backlight.

 

[bodazephyr]

Well the original one still worked it just made the screen flicker so I know its not the cable. And yes I said its a possibility that the screen stopped working, what im asking is if there is a way to tell that it doesn't work or other reasons its not being detected.

 

[compnet]

what im asking is if there is a way to tell that it doesn't work

Test screen......

If you don't have a known good part to test with there isn't a whole lot of magic you can do to determine if its motherboard or cable or screen.

 

[NYJimbo]

Test screen......

If you don't have a known good part to test with there isn't a whole lot of magic you can do to determine if its motherboard or cable or screen.

+1 Always keep a few broken screens for testing. I have LCD testing hardware, but thats $300 for the base machine and another $200 for all the addon cables and stuff. So the next working but cracked LCD you have, think about if you can use it for this kind of situation, it takes the guess work out and you dont end up ordering parts that you dont need.

 

[bodazephyr]

Ok so new information. I found a few things. I ran a diagnostic test and it came back with an error

LCD Connection Test
Error Code 0321
MSG Error Code: 2000-0321
Unable to access EDID EEPROM

So I looked that up and found a key combination, which is D + Power Button. Now that turns on my screen for a second then back off. So I know that the screen and cables work. It has to have something to do with bios or EDID.