No Backlight on LED screen

Hi ngvuanh

I have a Toshiba Sattelite L750 (part no. PSK2YA-04P028) with what I suspect is the same fuse problem.

I have attached a couple of pics of the motherboard.

If you would be kind enough to identify the culprit(s) for me it would be very much appreciated.

 

I don't see LED fuse in your laptop.
However, L36 might act as a fuse (sound weird right?) but it is worth to check it.

 

Since not all laptop makers have the same design for LED backlight protection, so some may have fuse and other may have used their own design.
I will try my best to show what you should do. In most case, you should have an multimeter to check ohm and dc voltage.
If there is a fuse on power supply line to LED, then trying to bridge it is really an easy job. Otherwise, you may have to use multimeter to check the voltage status for LED power supply trace.

 

Hi ngvuanh, thanks very much for your help. My VAIO is back. : )

 

I'm glad you got it back.

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Hi ngvuanh

Would you mind helping me with my Toshiba (post #305) when you get the chance please?

Ive spent several hours trying to identify the fuse in question without success.

Your help is very much appreciated.

 

Hi.

Do you know the one for a VPCEC2M1E?

Motherboard model is MBX-225

The only one I found was F15, but even after shorting, no LED light. (I know for sure it's LED since there's no Inverter on it).

Can't really take pics out now, but if really needed I'll post them tomorrow.

 

F15 is the right one. Make sure you bridge it correctly.

 

I did bridge it correctly. It reads 19.x volts on each side... but no LED light. It's also strange that it would be that fuse because with a smaller LED display it powers up nicely, but the image is divided into 4 (or I have 4 images of the same screen).

 

Also, with a smaller screen, it lights up but the image is multiplied by 4 (it's a 11"). But then again I dunno if the smaller one works ok with another laptop or not, or if it's in good condition overall.

Can anyone help?

 

There could be a dip switch to select lcd type. You might have different type of lcd.

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Hi i have the same problem and i think F4 (H) fuse fail, can you confirm that ?

My sony laptop, PCG-91211 M

you can see my mother board on my screen shot.

picture one front
picture two back



Edit: It's Work !!!! I could not wait so I tried and it is the H fuse needs to be changed.

Thanks alot for this post, thanks to ngvuanh and Goczku !!!!!

 

That might be it, do you have a service manual for the EC series? all I could find was for EB and EF I think.

Also I have the original CLAA173UA01A LED Screen that came with it that shows the picture perfectly but with no light.
Someone told me the LED Screen might have a broken fuse as well (since I repaired the one on the motherboard but it still showed picture with no light.

Do you know where the broken fuse might be located? Would pictures of the LED Screen panel help?

Thanks

 

I have the same problem (dark display) on a Sony PCG-91211M. A couple questions for you:
1. How did you confirm it is the H fuse which is defective?
2. Where did you buy a replacement fuse? Did you remove and replace it? or did you solder it?

 

I have answers for what @dovichino did.

It's obvious in what he says above unless you don't read English. He bridged the fuse and LED worked again.

The second picture shows answer to your question.

 

To ngvuanh :
I have the same problem (dark display, bad LED, but PC works fine when connected to an external VGA display). Laptop is a Sony VPCEJ3B1E, motherboard PCG-91211M.
I located the H fuse (1A) on the motherboard, tested it for continuity with a multi-meter, and found it works well: the fuse is not blown. So I am lost as to how to fix this problem. Should I solder the H fuse anyway? Please advise if you can.
Thanks,

 

My first question for you. Do you still see the picture on lcd even though without back light?
If so, you should test F4/1A with voltage on both ends.

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Yes, I have a faint picture on LCD –can be hardly seen in darkness- but no back light. I have re-tested the F4/1A (H) fuse on motherboard with my old analog multi-meter: it shows continuity and a very low resistance (almost 0 ohms). So I think the fuse is good.

 

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 have an SVS151190X where the backlight is not working. I replaced the LCD screen which was broken and everything worked fine for a while. Then I was having problems with adjusting backlight brightness, then it would only detect the external VGA port for a default monitor.

Needless to stay, I formatted my harddrive and then it would only detect my LCD Display as a low resolution 40hz refresh rate monitor.

Pretty sure in all my fiddling I blew the fuses on my mother board.

Here are the photos:

http://imageshack.com/a/img841/838/1tecx.jpg
http://imageshack.com/a/img836/8638/ip9s.jpg <- this is the clearest photo of the fuses
http://imageshack.com/a/img836/2415/3obr.jpg
http://imageshack.com/a/img836/5013/8ilp.jpg
http://imageshack.com/a/img841/5525/1g48.jpg
http://imageshack.com/a/img835/6100/eng8.jpg
http://imageshack.com/a/img843/8412/3ngw.jpg
http://imageshack.com/a/img836/1699/yarh.jpg
http://imageshack.com/a/img834/5443/ppbz.jpg
http://imageshack.com/a/img842/5120/lzxq.jpg
http://imageshack.com/a/img836/54/d09z.jpg
http://imageshack.com/a/img845/1417/x3s5v.jpg
http://imageshack.com/a/img841/4105/v6pr.jpg

I'm pretty sure this photo of an s13 motherboard:

https://lh4.googleusercontent.com/-3LOIln0IuEA/USCNGtc1fRI/AAAAAAAAAvg/8H-arVoWi30/s0/Fuses_2.jpg

from the first post here... http://forum.notebookreview.com/sony/708717-sony-vaio-s13-ips-display-mod.html

is a big hint.

Can I get a confirmation that I need to fuse the two parts labeled with an 'S'?

 

Since you said new LCD worked after you replace the old one, so I would doubt you have back light fuse issue.
Did you get replacement LCD the same as the old one?

 

Hi,
I bought on ebay an Sony Vaio PCG-71311M VPCEB2M0E with broken screen. I replaced broken screen and then... there is no backlight. I carefully searched this thread and it seemed that fuse F16 is not working but the problem is...I have no F16 fuse (empty space). Could you please have a look on my mother board and suggest which fuse may be blown? Thanks a lot!

http://imageshack.com/a/img834/8028/0gv3.jpg
http://imagizer.imageshack.us/a/img842/863/fxj1.jpg

 

Do y I have a small connector come along with lcd connector? If so you have a laptop with regular ccfl back light.

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Yes, This is CCFL lcd screen with 30 pin connector and inverter. I have tried to change the inverter but no joy. Could it be the wrong inverter I am trying to use?

 

There is no fuse for CCFL backlight lcd. Did the old LCD light up? If not, it could be inverter issue.
There is a fuse on inverter near input connector I believe, check it also.

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The backlight did work when I first installed it, but I kept removing it and reinstalling it several times in an attempt to get it working perfectly.

It was not the exact same model as my original screen, Off by a single letter, but it did work very well for a couple days. Not sure why it stopped working.

At some point though, the backlight stopped working. I thought that it was just broken all together until I shined a light on it and realized I could see the screen.

If it's not a fuse do you have any ideas?

I used a multimeter to check continuity and it looks like two of the fuses arent working. One is marked with an S and the other one is marked with ... something I can't read well.

I circled them in red, in the bottom right corner of the photo

https://imageshack.com/i/n6mi9mj

http://imageshack.com/a/img834/1516/mi9m.jpg

 

If new lcd worked when you first replaced it and now it stopped working but the fuses are still good, you need to contact your lcd seller.

 

Hey, same problem as countless others: Changed a broken screen hurriedly with the battery in and now have a functioning computer but with no backlight.

I took it to a computer repair place asking them to replace the fuse on the motherboard that corresponds to the backlight and when they looked at it, they said I would need a new motherboard and should just buy a new computer. I told them about the people online that are fixing it and he essentially said "do it yourself then."

I have a friend that repairs guitar amplifiers and is skilled with a soldering gun so I think I'll try to have him fix it. However, I have absolutely NO clue as to what I'm doing or even as to how I should guide him. Ngvuanh, can you find the fuse in my image(s)?

Can you tell me the exact steps I need to tell my friend who will solder it for me- or if they have already been posted, can someone direct me to the steps?

Thanks!

sorry if the image quality is sucky.. I tried Q_Q
Sony Vaio SVE141190X Motherboard - Imgur

 

I couldn't find a high resolution picture of your laptop board on the web so, please retake some pictures with LCD cable unplugged and the area of LCD connector is clear on both sides, so you may have to remove the board.
Sooner or later you will have to remove the board for service.

 

Okay. I was a little bit nervous to try to take the motherboard entirely out because I will have to transport it in my car tomorrow and don't want to damage it during the move.

I managed to take a picture, although it's a bit blurry, of the N thing everyone else has been getting pictures of.
http://i.imgur.com/khnvinX.jpg

So do I need to pull off the N with tweezers and then make a bridge solder or could you please explain what I need to do?

Thanks!

 

OK, the component with N is the fuse. In your case, it's probably blown now.
All you have to do is using a soldering iron and lead to solder both ends together (bridge).
You don't need to remove it.

 

The fix worked ngvuanh. Thanks so much for your assistance! You rock!

 

Can anyone indicate me where the blacklight fuse is? Please i need HELP!! SVE14A15FLS

Thank you!

imgur: the simple image sharer
imgur: the simple image sharer
imgur: the simple image sharer
imgur: the simple image sharer

 

can you help me?

 

Try this fuse in red circle.

 

Hi, I have this problem and maybe I found the fuse. can you confirm that F16 with the N is the right one? how can i repair it? thanks in avance

image1

image2

 

Yes, it is F16. However, I also noticed you have another problem. The board is suffering corrosion from liquid.

 

what does it means? it's not my notebook, it's a friend of mine's one.

 

Hello all, anybody can indicate me where the blacklight fuse is for an ENLE69KB Thanks

imgur: the simple image sharer
imgur: the simple image sharer

 

Can you tell me please what can i do with the blown f16 fuse? and what about the corrosion from liquid? i was thinking of upgrading this pc with more ram and ssd, do you think it is convenient with this problem? thanks

 

If the laptop still works, except lcd backlight, then bridge the fuse. Let talk other things later.

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Bridged the fuse, it's ok now!!! thanks ngvuanh!!
now i would like to update the pc: it's an i3 with 4gb ram, i'd add other 4gb ram e replace the hard disk with an ssd. can i do it, or it's better i don't because of the corrosion from liquid?

 

After reading this thread, the consensus is a shorted / replaced fuse will get the back light back. What are the risk for a fire with this jumper fix? Also, the location is going to be opposite the cable connector, or can some models be on the same side as the connector?

Dropped, cracked housing around the screen.
No back light, but functions other wise.

So what do you think about this jumper trick.

Take a small piece of electricians tape, and place a required length of aluminium* foil on the sticky side of the tape in the middle. Place the tape over the fuse with the foil properly placed over the fuses solder leads. Just apply pressure all around the piece of tape to make contact all around and to secure the tape better, rub it down to the board.

*You can roll up a piece of foil in a small length and flatten it down if you need to make sure it will make contact This way you can make a piece any thickness.

Ps, if anything, this is a quick check to see if the shorting of the fuse would be a workable fix, and allow it to be back lit.

 

As a temporary measure, just for checking, this ^ idea is great. However, once you've done all that, do take it to an electronics repair shop and get the jumpering done properly. If you can open up the laptop yourself and tell them exactly where to put the jumper, most guys I know will do it for free.

 

I do not recommend using aluminum foil and tape. If contacts are not properly fix, it will get electric spark and the damage will be worse.

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Hi
i have the same problem with toshiba d850 100
I try to test a 14” led display in a friends laptop and it looks like i blow the fuse
I would be very happy if u can point where is located the fuse

http://imageshack.com/a/img819/7392/5klp.jpg
http://imageshack.com/a/img853/9112/8qjo.jpg
http://imageshack.com/a/img855/9999/g1jh.jpg

 

Hello guys,
The same problem for me too. The laptop is a HP D008SV, which is relatively a new model.
I have marked on the picture 3 items. I do not know if I am correct but the item A does not have continuity, while the items B and C have. therefore, I assume that the item A could be the blown fuse. The big elipse is the area where the graphics card plug is located on the other side of the board.
Any help is much appreciated.
Thanks in advance,
https://dl.dropboxusercontent.com/u/19918300/HP%2015%20d008sv%20MB.jpg

 

I need help please
I have a sony vaio vpcsa and have no back light
Which fuse do i have to solder

Thanks

 

I can't see where it is unless you remove the board and take pictures for both sides.

 

A,B and C are all resistors, not fuse.