No Backlight on LED screen

HI all, Im at my wits end, and with Sony also. My screen cracked thanks to the airlines. I've replaced the screen, and now have no backlight. I also tried replacing the hard to find cable, still no joy!, I've check screen model numbers, still no joy, I even put the cracked screen back in and now there is no backlight on that. I found a forum on Dell inspirions on with same issue and they talk about a fuse. I found what I think is the fuse, test with no connectivity, tried a iron solder ball and still no luck! Any ideas, Im out of my frigin mind and SONY want Over $600 odd to fix!

thanks
Ben

 

Most likely a fuse issue.
I just fixed mine (model: VPCEA24FM). EXACTLY same issue: I left a thumbdrive on the keyboard and someone closed the laptop for me == broken screen (the screen still lights up, displays white screen only). I replaced the screen myself, no backlight since then......
I checked tons of forums, there are a lot of people facing the same issue, but there is not a cure for my exact model, the most close one is some guy replaced a fuse (F7 for his case) on a sony notebook motherboard and fixed it. Others are mostly Dells laptop, they replaced either F1 or F8 depends on the model.
Enough about the background. The infomation I got from these forums drives me to examine the motherboard of my laptop. I checked carefully and tested most of the fuses on board. Finally found one fuse is blown. That fuse was labeled as F16 near the plug for lcd screen on the motherboard. It should be 0 ohm, but tested as 20 ohm. then I applied a solder blob on it. I know, I should not do that since I have already ordered several small fuses and they are on the way, but I can't wait... It turns out that is the correct fuse! Luckly, my laptop doesn't have any shorts for the screen circuit. It lit up right after I put everything back and pressed the power button.
I took pics of the location of that fuse for other people who is stucked like I did. But I just registered here, not sure whether I can upload any pics, I will try.

 

Here are the pics, if they show up properly.

 

Just curious, did you check in your computer?

 

Oh, I forgot to mention: Since those fuses are tiny, the testing pins of your Ohm meter has to be really clean, especially the tips of those pins, or you can sharpen the tips if you don't mind damaging your Ohm meter. Another thing you need to consider is the motherboard may collect some dust on the fuses which might cause false reading. I found several fuses on my motherboard tested with high or no connectivity first, but after I wiped the fuses with alcohol and sharpened my testing pins with sand paper, they were all tested as good fuses(0 Ohm). Hope this could help you find the correct fuse.

 

ty lillizerg!! your pictures helped me find the fuse on my sony laptop and the backlight is working now

 

Hi to all , i have the same situation here , my laptop is a VPCCW1S1E can anyone tell me where is the fuse in this model? i searched everywhere i only find one under the screen plug on the mobo that says F 1 7 ..? can anyone help ? thanks ....

 

^post photos of the board.

 

Hi,

You should'nt worry, sounds exactly like my problem :

http://forum.notebookreview.com/sony/622168-vpc-z13-lcd-panel-upgrade-big-problem.html

(It stills works like a charm btw !)

 

here are some pictures from the up side of the mobo near the screen plug
thank you all for the reply

 

You need to remove all other parts, then take out just the motherboard.
Take a clear and high resolution photo of both sides of motherboard.
Take the area around LVDS (LCD) connector on both sides

 

I have replaced SONY VAIO VPCCA290X screen, no back light. I took the battery out while I was doing it. Then I put the old one back. it has back light. It shouldn't be the fuse problem, right? What the problem will be?

 

NO, it's not fuse problem.
Make sure you have LED LCD. If so, it's LCD problem.

 

Alright. this works great. possible fix for all led LCD back-light. because it worked on a dell 1400 series.

 

Hi, i have the same exactly problem with the vpcea24fm, got no backlight after replace the screen, and i already tried two screens and still no backlight, i open the laptop and found the fuse that you showed in the photo but it seems normal... please explain how to do the solder blob.. Sony wants to charge me $600 dollars to do that and the laptop does not worth $400!... Thanks

 

Can anyone confirm if this is the fuse that is the trouble maker on my Vaio? Multimeter says its a dud and its located right on the backside of where the LVDS connector is but I need some reassurance

 

It was the correct fuse and soldered a bridge to fix it!

 

I'm surprised but it actually worked. I soldered the F16 fused with a jumper and it works. thanks for the help!

 

Another success story from me, i managed to get work my vaio vpceb4l1e burnt fuse, after 2 hours of work and i found f16 fuse marked with an N sign, soldered it and it worked like a charm. Thank you... Have a nice day

note: i replaced broken screen with battery on, it was the cause.

 

I'm shocked how many people are replacing lcd screens with power on and/or battery installed. What exactly would prompt somebody to do such a thing?

 

i was i an hurry, it was the main cause. Otherwise i will certainly remove battery first i was a good lesson to me,i will never forget again

 

Can anyone tell me how they manage to solder this?

I am a complete newb at this and would appreciate if someone pointed me to right direction (a video maybe?)

 

hi, been searching for the right fuse through the night & still can't find it...

VAIO VPCEB4L1E........can anyone please help me?





All sizes | DSC01729 | Flickr - Photo Sharing!

All sizes | DSC01728 | Flickr - Photo Sharing!

 

we need higher resolution macro photos of lcd cable connector area both sides and colour please.

 

is it a known issue or just a trick to make it work?

 

@applemaca
The fuse is pointed by red arrow.

@trieudoahong
It is not a trick, you have to replace or short the fuse to get backlight back.
It could be a fault in design or just improper handling when people replace broken LCD (not unplug battery/AC adapter).

 

Hi i got similar problem with my vaio p11z with 8" led screen I've read whole story and im sure i need to replace the fuse... problem is i cant locate anything with F or N , bios battery connector is marked red and i spotted two resistors marked green i got no way to test it will have to buy multimeter... maybe someone had this model with same problem ... i marked the connector on both images fuse should be somewhere close but board is so tiny im not sure if everything is visible...please please help me... if you need better pictures or if you got anything that could help respond regards rob
ImageShack® - Online Photo and Video Hosting

 

You might have other problems than just a blown fuse.
I notice the board was suffered liquid spilled with evidences of corrosion.
ImageShack Album - 2 images

 

hi thank you for respond yeah I've noticed that white stuff on the board .... i bought this laptop of ebay with broken screen thought it will be easy screen replacement bought new screen then new cable still no joy....then i found this forum apart from back light its perfect working order i checked with external monitor so im 100% sure fuse is the case... can You see anything that could be looking like fuse ? thanks in advance Rob

 

I posted your pictures with some red circles.
I have pointed out the fuse for you on the second photo.
It is at lower left corner of the board on the side without CPU and chipset.

 

man you are great thanks i will get back with results of the soldering i suspected that this might be it its marked " 14 " i will just short the fuse and will see thanks again

soldering done and its working perfect thanks again this forum is great... im doing bit of fixing myself reballing dead graphics ps3,xbox,laptops, now dead led backlights ^^ still learning... everyday. thanks again rob

 

I have a PCG71313M laptop with a similar problem , would you have a photo of which fuse to check on my motherboard,, thanks

 

Your laptop is EB series, so F16 will be fuse for LED.
Look at the photo on page 3 to see where it is in your laptop's board.

 

Please help, I have the VPCEH sony laptop and I can't seem to locate the fuse, has anyone looked into this model before? on the bottom the model is PCG-71811W, many thanks in advance

 

If you want to fix the issue, sooner or later you have to take the board out.
Let take the boad out and take a photo of both side around the LCD connector, so people can help.

 

Here are the pictures of both sides of the mainboard by the cable, the part that looks burnt is from me thinking that was the fuse and soldering a bridge but that wasn't it..

 

I believe F4 fuse on the side of the LCD connector (next to it).
It is in brown color with white H letter.

 

I actually tried to bridge that one first and the backlight still doesn't work..

 

So I bridged F4 and no luck, is it possible that I need to bridge boht the F4 and that green one on the other side labeled as D?? My multimeter shows both of them as 20 intead of 0...

 

Are you sure that you have LED LCD and only backlight is out?

 

Yes I'm 100%, I replaced a cracked LED screen just few days ago and the backlight was out on both new and old screen, this is driving me crazy as everything works but the backlight, I can see the images with a flashlight up against the screen and it's LED as there's no inverter and the model number PCG-71811W VPCEH26EA which only come in LED option

 

Well, I gave up, thank you for all your help...

 

wow, amazing thread just fixed my friend's vaio vpcej28fx. Same problem with blown f4 fuse, after lcd panel replacement, fuse had big "H" on it, bridged it with solder - boom worked like a charm. Thanx to everyone!

 

hi i just found this topic here about the backlight issue on led displays and i have a sony vaio VPCEA4S1E and same problem cracked display ordered a new one and now no backlight

and just to make sure i will do the right thing can someone check the pic below and let me know if the fuse to bridge is the F15 with "n" on it. That is the region right under the lcd connector.



thanks in advanced

lucas

 

It could be the one.
If you have a ohm meter, you will find out.
It's also worth a try.

 

That's fantastic! It worked

Just bridged the fuse in the pic above and poof! backlight came back!

Thanks for the support. And hope everybody with the same issue can repair too.

 

Hello!
I had the same problem and used the bridge to solve. I really appreciate everyone's help. My notebook is VAIO PCG-61411L
Now I wonder where I can buy the fuse N to do the job the right way because if it's there is because it has some utility.
Thank you!

 

I've got a Sony VAIO VGN-TZ31WN with the same problem. I've just replaced the LCD panel and have no backlight. The screen works perfectly well on a similar TZ computer so I know it's not a fault with the screen panel. There are two options I can think of - either the hinge switch is sticking down or the the fuse, as mentioned above, is blown. Problem is I can't find either!

Anyone help on this, especially the hinge switch as I can't believe I cannot find it, on most laptops they're obvious.

 

Hi im kind of new to this stuff and have the sony vaio VpcEE3WFX with the backlight issue i have searched google for months before i found this this thread and was wondering if you could please help locate the fuse and what is bridging it mean below are the pic thank you in advance

 

You should have a steady hand to take a picture.
Those blurry pictures like these are really hard hard to see.
However, the small green one in the last picture could be the one.