Sony Vaio VPC-SB2S9E display backlight issues after reassembly

[rfsapiens]

Hello people,

I have a Sony Vaio VPC-SB2S9E laptop and yesterday I decided to take it apart because it was overheating (92ºC on prime95...) and it didn't have dust not even on the fan or heatsink so I followed the service manual which is similiar to an older revision so it is intended for my laptop.
Unfortunely the process didn't go very well because I didn't have a guide to follow the procedure to the end and I didn't feel confortable with the fragility of some plugs and the fact the board didn't want to come off after removing the screws so I gave up and reconnected gently all the plugs on the motherboard, so they are correctly reseated and reassembled everything and put back the screen screwed into the chassis. The problem is that the laptop works but I don't have backlight on the display everything is dark and I don't know what to do I feel kind of in "panic" :/
There was some accidents during the procedure... first while using a plastic flat screwdriver even with a lot of care it scratched the bottom a bit but it doesn't have any circuitry on that place and the other place it was close to one of the ribbon plugs but also it didn't cut anything as far as I can tell...
After that in the bottom close to the daughter board, the plugs covered with an adhesive, when I tried to remove that plug which is a black plastic plug it bent the metal pin contacts (which are so soft like butter or something) fortunely I was able to straight them all and put the plug back in place and then I reassembled everything and it had the same symptoms I described here so I went to that plug again and tried to take it out gently to reseat it but when I did it one of the pins just desoldered and was out with the platic plug so I could reseat the plug and pull that pin making contact with the motherboard... Unfortunely the symptoms continue... The laptop boots and does everything except the backlight on the display. Also I forgot to mention that with all of that fuss of pulling in and out the ribbon that connects the palmrest to the motherboard (sony 073-0201-9364) got wrecked in one of the points since 2 contacts of that ribon just broke a bit...
So what could it be the backlight on my laptop? I feel like I just screwed up a good laptop and I don't know exactly what to do next to make it work again...
And I don't get it since I didn't pince any cable at all I was very careful. I heard that the board has some fuse for the backlight but I don't know what to do or think...
Do you think it's all fixable? Is that common this pc's giving backlight or display problems after reassemble procedure?

Can you help me?

Thanks in advance for your attention and kind help.

Here are the pics of the "broken" plug:

http://postimg.org/image/cajije6e9/
http://postimg.org/image/lyf34u24d/
http://postimg.org/image/z8rdctqoh/

And the actual look of the ribbon cable that I described here:

http://postimg.org/image/xqjgbfm77/

With the best regards,

Rfsapiens.

 

[rfsapiens]

Well I read about the fuse and it seems it's very common this issue of burnt fuse causing no backlight... Is this what's happening here?

 

[Burpo]

If the lcd/inverter cable is plugged in wrong polarity (can be done) = no video. ie. plug it in backwards=no video..

 

[rfsapiens]

Hello,

Thank you for your reply.
I have video I don't see anything because I don't have backlight on my display I have to point a flashlight to see things.

 

[rfsapiens]

Hello people,

Ok I got some high dosage of calmness and also I found these 2 videos on youtube which helped me to see how to remove the motherboard.

https://www.youtube.com/watch?v=HbxFq-m6t40

https://www.youtube.com/watch?v=uX_dcC43plo

The plug itself it doesn't seem that it needs soldering but you may help me by seeing this picture.

http://postimg.org/image/91rf42o95/

Now I don't know if I must replace the fuse already or not... to get back the backlight
What do you think I can do? Do you think it may really be the fuse?

With the best regards,

Rfsapiens.

 

[Burpo]

Hello,

Thank you for your reply.
I have video I don't see anything because I don't have backlight on my display I have to point a flashlight to see things.

This is what I'm saying.. If the backlight isn't working, it could be the backlight power plug (sometimes a pink wire & white wire with white plastic plug on the end). It usually plugs in under the keyboard bezel, (near the LCD & hinges) & if unplugged or plugged in backwards = no light.. BTW, Prime on a laptop can cause that kind of heat.

 

[rfsapiens]

Hello,

First of all thank you for your kind atention and help It's giving-me the reassurance I need right now to stay calm.
Well I think the plug only enters /fits in one way as the cable comes from the screen bezel... I have video (if I point a flashlight to the screen I can see what I'm doing)
Well at least changing thermal paste worked... the temperatures in Prime95 droped 12ºC which is great for this laptop
It seems that the only thing that I may do is the fuse thing -> http://forum.notebookreview.com/sony/613996-no-backlight-led-screen-33.html

what do you think? do you think it's safe to do this and try to save my laptop?

With the best regards,

Rfsapiens.

 

[Burpo]

From your link..
"Re: No Backlight on LED screen
Ok, problem solved. The cable connecting the motherboard to the LCD --and powering the back light- was loose. I re-seat it and taped it, and everything is working fine now. Thanks for the info about the fuses: good to know anyway !!"

I don't think it's a fuse.. It probably needs a screen ($50)..

Ok, after some research, it's a newer laptop than I thought & only has the one 40 pin cable.

Is it plugged in & taped down?

 

[rfsapiens]

Hello,

Yes everything looks normal with the conections on the screen itself

 

[rfsapiens]

Hello,

Thank you for your reassurance, since the screen looks normal I'll try to see if it's the fuse

With the best regards,

Rfsapiens.

 

[chubbyfatazn]

In my experience with Thinkpads, if there's no backlight whatsoever then the fuse is usually blown. On older Thinkpads with CCFL backlights I just have to replace the inverter. For the newer models with the LED backlights, the fuse is on the mobo, which makes its replacement much more costly (unless you replace the fuse yourself, which is very difficult).

I doubt your backlight is dead based on what you said in the OP.

 

[rfsapiens]

Hello people,

I managed to fix the issue but unfortunely during repair procedure the motherboard got damaged (a pin near the power plug (one of those vertical plugs) is broken and I don't know how to resolder it since it's too small) so I think I need a new motherboard for it... unfortunely the motherboards with that part number (A1820705A) are too expensive or hard to find so I found on ebay a motherboard which it seems being the same exactly equal physically, same CPU's, same graphics, same ram, same plugs, same conectors everything in the same place, both are MBX-237 motherboards but it's for the Sony Vaio VPC-SC1A also the service manual for VPC-S series is the same. Will I have any issue installing this motherboard on my laptop? What can I do?
Thanks in advance for your kind help.

With the best regards,

Rfsapiens.

 

[Burpo]

You may be able to take it to a repair shop & have it repaired..

 

[rfsapiens]

The repair shop want $90 USD so I think it's better to find a replacement motherboard :/

With the best regards,

Rfsapiens.

 

[Burpo]

Sounds reasonable & the work is guaranteed.. If you find a motherboard, you still have to install it & more could go wrong.

 

[rfsapiens]

Hello people,

I'm back. I was able to find on ebay a motherboard compatible with my laptop so now I have a VPC-SB1V9E and it's working perfectly The screen came back and it's like nothing ever happened I didn't have to reinstall any driver at all. Now I'm focused on other issues like the webcam that it wasn't working and it still doesn't and I don't know what to do exactly even with the service manual because on my laptop the plug that comes from the webcam is connected directly to the board. I opened the screen bezel and I saw that everything is well plugged. What can I do to see if the webcam is detected?
Also another issue I have is I have some lighter area on my LED with the size of a character the white is whiter but the colors in that zone are correct. The issue is almost unoticable. What could it be and is there anything I can do to fix it?

With the best regards,

Rfsapiens.

 

[rfsapiens]

Hello people,

Thank you for your kind replies
As you suggested I made a clean new install to accomodate the drivers for this new board VPC-SB1V9E and everything installed perfectly except the webcam that it's not detected. I contacted the store who sold me this board and they say that the board is 100% working so I decided to buy another webcam with another cable but the problem persists so in both motherboards, the new and the old the webcam didn't work, I installed the new board and the old webcam didn't work... Installed the new webcam and the same thing happens . It doesn't get detected...I know this laptops are full of bugs and very sensitive but I think I put the cable correctly as it only enters in one way. What do you think it should be? what should I do?

Also about the laptop LED screen, I was able to get to the rear part of it and I tried the suction cup trick on the back of it and it helped but I didn't push with too hard because I was affraid since this suction cup is very strong and if I pulled more it would start to create "air bubbles" on the plastic that would change the light on the screen so I stopped, but the fact is that when I put the suction cup on the light area on the back of the screen and I left it there, the white marks all disappeared... when I removed the suction cup gently they return as nothing happend. What do you think I should do to fix my screen?

Thank you in advance for everything and for your kind help

With the best regards,

Rfsapiens.

 

[rfsapiens]

Any ideas?

 

[rfsapiens]

Hello people,

sorted out the webcam is working again... I booted with Hirens Boot CD with a Mini XP and the USB 2.0 Camera appeared on it's device manager so I went back to windows 7 and made sysprep generalize and voilá it appeared on the device manager also as installed.
The only issue left is the screen which I'm affraid to change but I don't know if the suction cup trick will definitely work to eliminate the whiter areas.
What do you think?

With the best regards,

Rfsapiens.