Acer eMachines G620 black screen

Genesis Acer emachines e525, e627, e725,...
November 9, 2018 at 01:53:26
Specs: Windows 7, AMD Athlon X2 64/4GB RAM
Hi there!
I'm trying to fix my uncle's laptop. It did this few times before, but few reboots and battery taken out fixed it usually. Not this time though :(
The problem: The laptop boots up to Win 7 64b (you can hear the windows Tadaa sound), but the screen is black during the whole time including POST and BIOS. There are no error beeps heard during boot. When it boots up to Win, you can use the Fn keys and it reacts on the "Back light" key (you can see the LCD goes pitch black and back to backlit) or the brightness keys. Connecting my other screen to the VGA port, you can hear the Win connect/disconnect device sound, but the screen (LG TV) does not recognise an input at the RGB connector. (Tried playing with the Fn+Screen keys too) Connecting my other laptop to the LG TV works just fine so no issues with the TV or cable.
I have even took apart the LCD screen to disconnect and re-connect the screen cabling. Could not recognise any burn smell or anything like this. Put it back together and its still the same.
Even read about taking out the battery then pressing the Power button + F12 key for 60sec - did that too, no joy.
Note: These Win 7 are connected to the internet, but the AutoUpdate is turned off. Including all other SW auto updates except Avast. And except Windows + Office + Avast, there is no other software installed. This laptop is literally used as a gateway to the internet for 70 years old uncle.

IMHO the LCD screen is fine. I think its some hardware (GPU) problem....

Now the questions:
Any ideas how to further troubleshoot this ?


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#1
November 9, 2018 at 05:01:38
Tell us if this gets any result for you.

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#2
November 9, 2018 at 09:00:45
Johnw Thank you for you suggestion, but do you really think, that a Windows OS crash can blackened your PC screen so you are unable to see the POST nor BIOS? If I'm not mistaken, POST and BIOS are loaded before the OS, thus Í'm not going to try your advice.
But thanks for the links, they might get handy one day. ;)

Update for all
After few more hours of tinkering around, I have found a way how to get the screen running again. But this is just a workaround and I need to find a permanent fix for this.
This is what I need to do to the laptop to make the screen working:
1. Power up and watch the pitch black screen
2. Wait till you hear the Windows "I have booted up" sound
3. Close the lid till its 80-85% closed and until it shuts down the light
4. Open the lid immediately
5. Tadaaa the windows screen can be seen again.

You can see that in THIS video: https://youtu.be/z3qHM4xw8pY

Its clearly seen that the screen is completely OFF for the first 37seconds of the video. No POST no text, no error beeps, nothing. It is just silently bootin' up to black.
Then it gets backlit at 0:37 and after few more seconds (0:52) you can hear the windows sound, but still nothing can be seen on the screen.
Then I have to almost close the lid so it gets switched off again (1:05) , and then quickly open it up.
Then the screen starts to work.

I have to note here:
The above described steps do NOT work anywhere else. I mean, If i start closing and opening the lid before 1:05 in the video, it does NOT bring the screen back! ?!

If I let the laptop boot up black. Wait few minutes and then try to close - open the lid, it does not work either.

When the windows is booted the workaround way and the screen works. Then I can close - open the lid how many times I want and it works OK (I have set up the windows power actions not to do any actions when the lid is closed).

It has to be something electro-mechanical in the display. I know that there are some switches in it to tell the LCD screen to power off, but my mechanical skills are close to zero... :(

Anyone with an advice what to do to make it work again?

message edited by Valsoraj


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#3
November 9, 2018 at 12:14:27
The cable between the laptop and the screen can intermittently fail due to wear at the hinge. However, it sounds like you disproved that possibility. As the fault seems to be affected by movement it is most likely a bad connection somewhere. Wiggling things gently or tapping around with and insulated object might help prove the point.

message edited by Derek


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Related Solutions

#4
November 9, 2018 at 14:58:28
Try using an external monitor, borrow one if necessary.

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#5
November 10, 2018 at 02:17:43
Ho Derek! Your answer is to the point!
At first disassembly I didn't turn the laptop back ON to check this. Before reading your post I did took it apart again and powered it on and there you go. Once you flip the cable back and forth you can hear the Win disconnect/connect sound clearly. Can be seen in this video: https://youtu.be/T2Mo6utZVlU


I have now ordered replacement cable and will see how it goes.
Thanks everyone for the replies so far.


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#6
November 10, 2018 at 02:20:52
Thanks for the tip Johnw, but I already did that. It is mentioned in my initial post ;)

"Connecting my other screen to the VGA port, you can hear the Win connect/disconnect device sound, but the screen (LG TV) does not recognise an input at the RGB connector. (Tried playing with the Fn+Screen keys too) Connecting my other laptop to the LG TV works just fine so no issues with the TV or cable. "


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#7
November 10, 2018 at 02:22:21
Nice job on the video, very good lateral thinking.

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