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Inverter Board


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#1 lolaalol

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Posted 28 October 2013 - 02:12 PM

Hi everyone, its my first post here and i trying to get some help about a problem on the laptop of my mom.
 
She has an acer aspire 6920g ( 4-5 years old ) 2 weeks ago the screen was almost fully black(I could hardly see anything ) but if i connect another monitor to the laptop with a HDMI cable everything is fine. After some research on google, i found that the problem were comming from the inverter board, so i bought a new one and i installed it last week. The problem was solved but since this morning the problem is back. Does the problem is still the inverter board ? or maybe a cable linked to the inverter board ?
 
Sorry about my poor english.


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#2 Roodo

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Posted 28 October 2013 - 03:07 PM

I d check to see if something came loose. Then its on to replacing the backlight.

#3 rotor123

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Posted 29 October 2013 - 01:58 PM

Hi, Your English is fine.

As I see it there are Five possibilities. Once You finish checking to be sure both ends of the cable between the Motherboard and the Inverter or that the LCD backlight cable is connected properly to the cable. The Back light cable, Usually Pink and White wires that should plug one way only into the inverter.

 

1. Defective Inverter Board, Try for free replacement.

2. Wrong replacement Inverter Board.

3. Bad Backlight. It could have gone Bad or it could have killed the Inverter.

4. Bad Cable between the Motherboard and the Inverter/LCD panel.

5. Bad Motherboard circuitry.

 

Number 4 and Number 5 are rare, but they can happen.

 

Good Luck

Roger


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#4 lolaalol

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Posted 29 October 2013 - 02:07 PM

Hi, Your English is fine.

As I see it there are Five possibilities. Once You finish checking to be sure both ends of the cable between the Motherboard and the Inverter or that the LCD backlight cable is connected properly to the cable. The Back light cable, Usually Pink and White wires that should plug one way only into the inverter.

 

1. Defective Inverter Board, Try for free replacement.

2. Wrong replacement Inverter Board.

3. Bad Backlight. It could have gone Bad or it could have killed the Inverter.

4. Bad Cable between the Motherboard and the Inverter/LCD panel.

5. Bad Motherboard circuitry.

 

Number 4 and Number 5 are rare, but they can happen.

 

Good Luck

Roger

 

Edit : Reopened the laptop this afternoon and I touched the cable you can see in the picture, when I rebooted the pc, the screen image was back.

 

Thanks you for your reply.

 

How can i check #3 ?

 

About number 4, i found that the Cable between Motherboard and the Inverter were strange (duck tape on it...), I will post a picture of it, i have to reopen the laptop anyways, i have not reconnected correctly the keyboard last time.

 

Here a picture (sorry about the bad quality) :

 gi15rAo.jpg


Edited by lolaalol, 29 October 2013 - 03:08 PM.


#5 slgrieb

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Posted 30 October 2013 - 12:02 AM

lolaaol, when your image came back after jiggling a wire or the connector, I think you solved your own problem. The connector might not have been pushed in all the way, or it's possible there is a short in the wiring. I'd check for any spots that look kinked or have bare wire showing through the insulation. But, I'm favoring a connector seating problem. Laptops have lots and lots of little tape strips in them. It's perfectly normal, and the purpose is to secure the wiring in place so it doesn't get pinched, shorted, or interfere with any parts joining correctly.

 

Most laptop displays use fluorescent tubes, and so they usually display the same warning signs of failure as, say, office lighting. They flicker, and often the light output is distinctly magenta before failure, so screen colors are off.

 

There are ways to isolatate a hardware failure more definitively between the inverter and the backlight, but I don't think they are practical for a one time repair.

 

So, I would definitely double check electrical connections to the inverter, and if you continue to get a screen image you're done.


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#6 rotor123

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Posted 30 October 2013 - 09:59 AM

It sounds like You have a Bad or loose cable. When You unplug that type You need to be careful not to pull on the little wires. In Your image you can see tabs on both sides of the plug, Those are what You use to unplug the cable..

 

That Tape is from the factory and is normal.

 

Good Luck

Roger


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#7 lolaalol

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Posted 30 October 2013 - 01:50 PM

It sounds like You have a Bad or loose cable. When You unplug that type You need to be careful not to pull on the little wires. In Your image you can see tabs on both sides of the plug, Those are what You use to unplug the cable..

 

That Tape is from the factory and is normal.

 

Good Luck

Roger

 

I never tried to unplug that cable, I jiggling it a little only. Does there is an online store where i can get those cables ? I can only find Invert board cable for macBook.



#8 rotor123

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Posted 30 October 2013 - 02:59 PM

Hi, When I search Google with this phrase

 

aspire 6920g video cable ebay

There are plenty of results.

 

I'm not comfortable on eBay myself however. I am keeping my fingers crossed the keyboard I ordered arrives OK.

If I could have found it elsewhere I would have bought elsewhere.

 

Good Luck

Roger


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#9 lolaalol

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Posted 30 October 2013 - 03:12 PM

Yeah i were using the keyword "inverter board cable".
 
 
It look to be hard to install ? 5 connectors...


#10 slgrieb

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Posted 30 October 2013 - 06:05 PM

The real question is since you "jiggled" the cable a bit, and the display was OK after a reboot, has it been stable? No intermittent problems with the screen going black? If the display has worked consistently, I wouldn't be buying any replacement cables. It's easy to accidentally pull on a cable and a connector as well. The image you posted looked to me as though a connector wasn't properly connected. That's still my best guess. I think a lot of people new to computer service have a major tendency to overcomplicate service issues instead of accepting simple solutions which are very often correct.


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#11 rotor123

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Posted 31 October 2013 - 10:05 AM

 

Yeah i were using the keyword "inverter board cable".
 
 
It look to be hard to install ? 5 connectors...

 

To answer Your question, the difficulty rating is moderate. Service manual would definitely be extremely handy as the connectors are delicate. The Video portion where it connects to the LCD panel is usally secured with tape for example.

 

5 connectors would usually be carrying Video, Inverter, Camera, Microphone between the screen assembly and the Motherboard.

Also in there will be the Wires between the Wireless card and the Antennas running through the hinge area too.

 

Good Luck

Roger


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#12 SA Spurs1

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Posted 31 October 2013 - 11:39 AM

If you can find the cable I would definitely replace that.






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