Question Asus laptop display not working

[nesini]

Hey hey.

So its a pretty long story, and now I am trying to get my Asus laptop fixed, in fact 2 Asus laptops. So at first, my Asus X550VX wasnt showing anything on the display. I have attached the laptop to the desktop monitor and was working fine, but there was no image on the laptops display. So I wanted to test if the laptop screen is bad, and I took another Asus laptop, also X550 series.

I have attached the display cable to the new laptop while still connected to the original laptop, but I forgot the cable for the camera in the original laptop, so I smelled something burning and saw sparks at the camera when I realized my mistake.

So now, neither of the screens are displaying anything, but if I shine with flash on it I can see the image (probably dead backlight), and when I plug them to the desktop monitor, both work good.

Then I purchased a new screen on ebay, received it today. Plugged it into the X550VX, and same story. The laptop turns on, screen is black but if I shine flash on it, I can see the image. Then I wanted to see if its bad cable, so I took the other laptops cable and used it on the same one, but same thing again. Obviously, I tried it on the other laptop with both cables too, but always the same result.

Now I am very confused with what it could be. Both laptops power on and work well when I plug them into the desktop monitor. But for any reason both of their display are not working, only when I shine a flash in it, and even the new one that I ordered from ebay. How much possibilities there is that the screen from ebay was bad too?

I would like to ask for advice, what I could do next, as I am running out of ideas and some patience too 🙁

 

[COLGeek]

Did you have the HDMI cable connected to both laptops at the same time?

 

[nesini]

Did you have the HDMI cable connected to both laptops at the same time?

Sorry, when do you mean? Neither of the laptops were even plugged in with HDMI. They were only plugged in with their display 30pin connectors, and when I mentioned I plugged them in to a desktop screen, they were with VGA.

 

[COLGeek]

I assumed you used HDMI to connect to monitors, not VGA. Same question, only with VGA.

 

[nesini]

I assumed you used HDMI to connect to monitors, not VGA. Same question, only with VGA.

No no, I connected one laptop with VGA cable to my main monitor and it worked, then I connected the other one and it worked too.

 

[COLGeek]

No no, I connected one laptop with VGA cable to my main monitor and it worked, then I connected the other one and it worked too.

Understood now. It wasn't clear in the original post.

It is definitely possible that you purchased a defective replacement display. Aside from double checking all of your connections, there isn't a lot else to try without swapping the display.

 

[nesini]

Understood now. It wasn't clear in the original post.

It is definitely possible that you purchased a defective replacement display. Aside from double checking all of your connections, there isn't a lot else to try without swapping the display.

So, what I was able to do today... I found another Asus laptop, and I have tested all3 displays on it. First, I plugged in the first laptop display (the one that I originally intended to fix), and it doesnt work. Then I plugged in the second laptop display, and it works (but if I lug this display into any of the other 2 laptops it doesnt work). And then I have plugged in the new display that I bought, and it doesnt work either. Now I am even more confused.

 

[COLGeek]

Sounds like you have a variety of issues, each will have to be resolved one at time. You may have damaged the actual GPU portion of the laptops, not just the defective displays.

 

[nesini]

Sounds like you have a variety of issues, each will have to be resolved one at time. You may have damaged the actual GPU portion of the laptops, not just the defective displays.

How would be the best way to go about that? I mean they still work on the destop monitor when connected. And on one laptop a display works and when I put it back on original it doesnt.

 

[COLGeek]

You can try replacing all the cables that attach the actual computer to the display. It is difficult to follow what you have done with each (now three?) laptops.

Please list as Laptop 1, Laptop 2, Laptop 3, etc. Going forward. The actual issues/resolution may vary between them.

 

[nesini]

You can try replacing all the cables that attach the actual computer to the display. It is difficult to follow what you have done with each (now three?) laptops.

Please list as Laptop 1, Laptop 2, Laptop 3, etc. Going forward. The actual issues/resolution may vary between them.

I totally get that

So ASUS X550VX will be laptop 1. It is the one that I was first trying to fix. I powered it on and the screen didnt work.

Then ASUS X550 will be laptop 2. It is the second laptop I have, where I attached the display cable from the laptop 1 but forgot the camera cable in the laptop 1. I powered it on and saw sparks on laptop 1 camera and immidietly turned it off.

Then I have another ASUS, which works perfectly fine, so a laptop 3. If I plug in display from laptop 1 to laptop 3 it doesnt work. If I plug in display from laptop 2 to laptop 3 it works. If I plug in the new display that I bought to laptop 3 it doesnt work. All though display from laptop 2 works when plugged in to this laptop 3, it doesnt work when I plug it into laptop 2.

So what I have now are 3 laptops and 4 screens (but I wont be playing around with laptop 3 screen), so lets say 3 screens. Neither of the 3 screens work on laptop 1 or 2. 2 screens work ok laptop 3.

I hope that makes more sense now.

 

[COLGeek]

To summarize:

Laptop 1 does not work with any internal display

Laptop 2 does not work with any internal display

Laptop 3 works with its own display AND it works when Laptop 2's display is attached to it.

Your new replacement display does not work with any system.

Is this correct?

 

[nesini]

To summarize:

Laptop 1 does not work with any internal display

Laptop 2 does not work with any internal display

Laptop 3 works with its own display AND it works when Laptop 2's display is attached to it.

Your new replacement display does not work with any system.

Is this correct?

Yes, that is all correct.

I have also tried to switch display cables to see if I will get anything interesting there, I took the cable from laptop 2 and used it on laptop 1, but it doesnt even turn on, so cant try the cables.

 

[COLGeek]

When you have swapped displays, did you also cycle through the display output options (fn key)?

 

[nesini]

When you have swapped displays, did you also cycle through the display output options (fn key)?

You mean the fn + F7 right? I have just found out a few things now that I went to try that.

So I plugged in the new screen that I bought into laptop 3, waited a few seconds after powering it on and pressed fn and F7 a few times, and the screen started flickering (backlight). If I pressed enter or something it was just black, but after pressing fn and F7 again it started flickering again.

Then I have tried laptop 2 screen in laptop 3, the combination that worked before, and it still works well. So I put the screen into laptop 2, and I can see the BIOS image, but very very dark. When pressing fn and F7 nothing happens. The image works but backlight doesnt, but when I plug it into laptop 3 it works normally.

 

[COLGeek]

Sounds like the replacement screen is defective.

Laptop 2 the part that drives the backlight seems to be the problem. This is all likely integrated into the motherboard itself and would require changing that. I haven't looked up specifics on this device.

 

[nesini]

Sounds like the replacement screen is defective.

Laptop 2 the part that drives the backlight seems to be the problem. This is all likely integrated into the motherboard itself and would require changing that. I haven't looked up specifics on this device.

Yeh most likely, its just annoying I hope Ill be able to sort it out with the seller.

I didnt knew there is any part on the motherboard to do with backlighting, so it could be that yes. For laptop 1 or 2, you think its possible that the display cable is bad?