Asus Zenbook UX31E problem with internal display

Dimi_01

Honorable
May 8, 2012
8
0
10,520
1
Hello all,
I recently got this laptop Zenbook UX31E second hand.
I disassembled it to try a few things. One of them is attempting to attach a full HD LCD panel belonging to a UX31A zenbook.
(with the new panel the led lights were switching on, but no display.)

While attempting to reatach the LCD cable to the internal socket on the MB for the LCD display.
While the 2 sockets not completely positioned but still touching each other,
I heard a short cracking noise and I smelled burned.
After this moment the LCD would not power on!
No visual damage.
HDMI to External display works and the laptop is functional with external display.
However the internal display does not work.

The other display that I was trying still works properly on the other laptop UX31A.
but on this laptop UX31E none of the displays lights up.
Still if LCD attached and laptop powered on there are very very subtle flashes of life in the display, almost unnoticable, but it still stays OFF.
Im OK with buying a new LCD screen. I was about to do that anyway because the original one had visual defects. A LCD display for this laptop is somewhere 50-60$ with shipping.
However I suspect, even with a new display, it will not work.

I am not professional laptop technician.
I am suspecting is the display socket on the MB. Maybe it has a small chip to do something that got fried, no idea.
So as I see it I can either use this laptop forever with external displays, which is a pity. Its a 1kg pretty powerful thing.
Option 2: I can sell it to someone that needs a small server.
Option 3: Buy a new MB. its around 170 usd. In adition to the 60$ screen.

My question is:
Is it really the MB?
Is it repairable?
How much would a repair cost?

Any software tool to diagnose this types of problem in a zenbook?
 

Dimi_01

Honorable
May 8, 2012
8
0
10,520
1
Hi all,
I examined again the laptop MB for visual problems.
This time I unmounted it from the case and checked the back side.
One the back side I found one burned SMD capacitor.
I think it is replaceable.
However I have no idea where to find a replacement.
No idea if the adjacent capacitor needs replacement.

Could someone tell me how to measure the adjacent capacitor?
More importantly, where to buy a new SMD capacitor?

Picture of the back of the MB with the burned SMD capacitor:
http://s22.postimg.org/mcp7i01sh/20151219_210208.jpg
Picture of the front of the MB with the display port for the internal LCD that shorted.
http://s14.postimg.org/9lk0544bl/20151219_205734_resized.jpg
The display port:
http://s14.postimg.org/9lk0544bl/20151219_205734_resized.jpg
(2 pins are missing but I think this is by design)
 

Dimi_01

Honorable
May 8, 2012
8
0
10,520
1
I got this capacitor to be replaced by a professional very carefully.

There is a small burn on 2 of the pins of the screen connector on the MB.
But I think it is not preventing them to send signal. The middle part of the pins looks not burned.
MB LCD Connector:
http://s14.postimg.org/9lk0544bl/201...34_resized.jpg
Front Side of the MB (this time proper link):
http://s7.postimg.org/ja4pj1b2j/2015...39_resized.jpg

After replacing the capacitor there is a almost completely dark image on the display. The data channel towards the LCD looks like its working now.

However.
The LED lights that are supposed to brighten and light up the screen are not powering on.
There is a short I guess somewhere.

This guy that helped me said that he needs a diagram for the MB to look further. He is not particularly specializing in laptops.

I am guessing for a professional that deals with this particular stuff this should be relatively easy problem. There is no visual damage on the board.

Any help? Where could I get diagram or information what to look for?
 

Dimi_01

Honorable
May 8, 2012
8
0
10,520
1
Fixed.
With the replacement motherboard my friend measured the burnt element and it appeared it is not a capacitor but inductor.
He replaced it again with one with the proper values and now the LED light works.
 

Tonwell000

Commendable
Aug 27, 2016
3
0
1,510
0
Hey Dimi_01,

I have exactly the same problem. Do you remember the value of inductor that you replaced. I dont have other MB to get the proper value.

Or can i put any inductor?

Could you help me??

Thanx!
 

Dimi_01

Honorable
May 8, 2012
8
0
10,520
1

Hi,
unfortunately no, I sold both the Laptop and the MB.
You could ask somebody what values of inductors there are and which one is probable.
 

Tonwell000

Commendable
Aug 27, 2016
3
0
1,510
0
Hey man, i appreciate your help. I found another guy with same problem e he eliminate the issue with a wire.

I made soldering in a place of inductor and get the same result. Its working again the backlight!!!

Thanks from Brazil!
 

Tonwell000

Commendable
Aug 27, 2016
3
0
1,510
0
Hey guys. Me again

Someone of you had some problem with battery?

I have been using ux31e without battery, because i bought in this condition. Now, i bought a used battery and it toggling between ac and battery, even shutdown i see on the power ac led blinking.

I cant charge, but i charge in other ux31e and put back and i can use normally. Problem starts when a try to charge.

Someone got this problem? Could be inductor?
 
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