Laptop screen stays black after reassembling the laptop

[ITNation]

I dissembled my Toshiba Satellite A135-S4527 to clean it on the inside, but once reassembled the screen stays black. It is visible that the computer powers on, but there is nothing on the screen. I pressed Fn key in a combo with F4 and F10 to no avail. Besides that I tried taking out the HDD and then putting it back after one minute and that did not fix it. I did one other thing - hooked up the external monitor and nothing even comes up on that other monitor too. In addition, I double checked all the connections and everything seems to be plugged in correctly. Video cable is plugged in also. Are there more than 1 video cables that connect to the motherboard? I also have a ground wire that runs short along the video cable, but I am not sure where that cable is supposed to attach to. I just leave it loose tucked in by the laptops hinges. I have pictures of all this, but I am not sure if I can attach them here. That would definitely help. My computer was working very sluggishly, but now I cannot use it at all.

 

[ITNation]

Is there a website to find my motherboard scheme online maybe? I don't know where else to look for help.

 

[ffg7]

try this, disconnect the power adapter from laptop, remove main battery from laptop, hold the power button down for a 20 count, reinstall main battery back into laptop, reconnect power adapter to laptop & turn on laptop.

 

[ITNation]

I tried that in the past and that did not fix it unfortunately.

 

[jarotech]

Is there a website to find my motherboard scheme online maybe? I don't know where else to look for help.

Hi, what will you do with a schematic for the motherboard?

 

[ITNation]

One of the connectors on the motherboard is broken, but still plugged in. Just want to see if that connector has anything to do with the video even though I doubt it.

 

[jarotech]

Which connector, give me the number beside the connector if you can.

 

[ITNation]

JP34. It runs right next to the wider video cable.

 

[jarotech]

If I have the right schematic, JP34 is for the left speaker with two wires.

 

[ITNation]

You are probably right. But, I still dont know what is wrong with the screen. Now, I can at least eliminate that connector.

 

[jarotech]

But why you said the laptop is powering on, do you hear the fan or the HDD, does the power light come on.

 

[ITNation]

The power comes on, but I dont see much of anything else. Not sure about HDD or fans

 

[jarotech]

I can only suggest you to open the laptop and verify all the connections.

 

[ITNation]

That's what I am doing now. Can you confirm that video is only 1 cable?

 

[jarotech]

Yes, in all laptop you only have one connector for the screen.

 

[ITNation]

Could it be that my HDD got damaged? If the answer is yes, how do I test it knowing the screen just stays black and there is no way to tell?

 

[jarotech]

To eliminate the HDD, try to boot in the BIOS, if you can't get into the BIOS, then, it's not related to the HDD.

 

[ITNation]

I can't even get to BIOS too. Now, what started happening is that when I turn on my computer the power light keeps switching between pink and blue colors for a few seconds and then finally stays blue. Don't know what that color change indicates. Also, the HDD light only lights up briefly when I turn on the laptop, but then stays turned off.

 

[ITNation]

Hard to believe, but 2 DDR2 RAM sticks that I recently purchased were defective. I tried everything else, but not using the old RAM up until now. I thought that the possibility of the new memory being defective was too low, so I did not even try to use the old one. Thanks to all who tried to help.