IdeaCentre B520 display backlight issue

I have a Lenovo Ideacentre B520 All in one. It powers on alright. But the LCD backlight does not come on. I can see a faint picture on the screen if i use a flashlight. The unit's Backlight converter board i noticed the capacitor on it is damaged. I can order a new board and replace it (easy enough). I was wondering if this is a common thing on these all in one units? Another person told me it could be the mainboard of the unit. I'd rather spend about$50.00 than 189.00. Also when i hook the unit to HDMI out and use a external monitor i see the lenovo splash screen, but when i install a hard drive after the BIOS screen it locks up and i have to restart, but if i do not install a hard drive, then i can boot ubuntu or memetst (just for testing purposes). Any ideas?

Yes, at maximum brightness level the backlight bleeding is very visible but I use it at 5 or 6 level where it has excellent contrast ratio considering how crappy current notebook displays are in general. The uneven backlight is caused by fancy LED backlight which is still not able to deliver similar quality regarding uniformity as good old CCFL backlight (that's why professional LCD monitors still rely on W-CCFL backlight). But I agree that the top-left corner is way too much bad and might indicate that the panel is seated badly in the frame. On the other hand my old IPS panel in R51 also have backlight bleed at maximum brightness level.
Major problem is that Lenovo is still not able to fix the stupid bug with brightness level always set to max in BIOS screen that the backlight bleeding is very visible and irritating everytime you boot your machine.
IMHO, the X220 IPS panel is still much better than any ugly contrastless TN panel Lenovo puts into ThinkPads (except 15" FHD). I bet that you would hate the X220i TN panel more than this one
There are also two different revisions of the IPS panel, the second one fixes problems with image retention. As for comparison with Z60m, X220 display lid is much more fragile so the panel is not protected well against pressures and flexes. In any case panel flex should affect the backlight bleeding temporarily only. If it persists it is subject to repair (replace, reseat etc.).
Unfortunately I don't have any good low-light camera that takes useable pictures in dark environment so I can't post relevant images of the backlight bleeding.

Similar Messages

X220 IPS display backlight issue (with photos)

Hello,
I've purchased the Lenovo X220 laptop with the Premium HD IPS display and I do have a problem with it (see below).
Laptop was purchased something like month ago and I've spotted this after I've started to work with it more heavily but after 14 days, so I was not able to return it to the seller (http://www.lenovoonline.cz).
When you put backlight to maximum you see that the display is not evenly lighted and forming bright spots on the bottom of it. It's most noticable on the black background.
I've sent notebook for repair (http://www.pcnet.cz) with this description (translated to english):
"With maximum brightness set and the black display/background (eg. BOOT screen) on the bottom edge of the display there are visible white spots/maps. Small but visible and not even with different sizes. It's most visible on black background and while limiting external light (darker room, working in the night). Spots highlights even more when you try to pull the display towards you into steeper angle."
The laptop has been in the repair for 2 weeks and the result was this description:
"This kind of display is very sensitive to any pressure, and it will result in the brightening the place. It is specific for this model line and it's not the reason to warranty repair. We recommend to lower the brightness level in the darker room. Check of the display frame has been done and no problem has been found."
Later they said they've replaced the panel too.
However the issue still persists (see attached photos).
Let me say few words about this:
display is showing the spots while in rest I'm not touching it, if it's sensitive for pressure than it is indicating that there's some pressure on it while mounted in the frame
I want to have backlight lighting the display evenly on the whole surface area, that's the correct function of a product anything else is NOT
if they claim this is how it should be and it's actually a "feature" of the PREMIUM display then if I had known I would choose regular TN display and even save some money, needless to say that in that case the word PREMIUM sounds like a bad joke
after lowering brightness level problem doesn't go away, still visible just gradually slightly less, depending on the brightness set
if you are working in the night without external light this is VERY irritating
So my question to you X220 community is, do you happen to have same issue?
as they say it's "normal" with X220
Thanks
EDIT1:
I've done a search now and it seems I'm not alone with this issue
PS:
I'm attaching two photos.
First is the X220 (booted into GNU/Linux with X running and mouse as reference).
Second is the very old Z60m (booted into Windows and running blank screensaver).
Compare for yourself which one you would prefer.
It was shooted in absolute dark (I'm used to work like that) with Canon EOS350D on tripod.
There are some slight artifacts which you normally not percieve but anyway I think it clearly shows my point.
X220
Link to image 1
Z60m
Link to image 2
Moderator note: images larger than 50k converted to links per forum rules: Lenovo Community Participation Rules

Yes, at maximum brightness level the backlight bleeding is very visible but I use it at 5 or 6 level where it has excellent contrast ratio considering how crappy current notebook displays are in general. The uneven backlight is caused by fancy LED backlight which is still not able to deliver similar quality regarding uniformity as good old CCFL backlight (that's why professional LCD monitors still rely on W-CCFL backlight). But I agree that the top-left corner is way too much bad and might indicate that the panel is seated badly in the frame. On the other hand my old IPS panel in R51 also have backlight bleed at maximum brightness level.
Major problem is that Lenovo is still not able to fix the stupid bug with brightness level always set to max in BIOS screen that the backlight bleeding is very visible and irritating everytime you boot your machine.
IMHO, the X220 IPS panel is still much better than any ugly contrastless TN panel Lenovo puts into ThinkPads (except 15" FHD). I bet that you would hate the X220i TN panel more than this one
There are also two different revisions of the IPS panel, the second one fixes problems with image retention. As for comparison with Z60m, X220 display lid is much more fragile so the panel is not protected well against pressures and flexes. In any case panel flex should affect the backlight bleeding temporarily only. If it persists it is subject to repair (replace, reseat etc.).
Unfortunately I don't have any good low-light camera that takes useable pictures in dark environment so I can't post relevant images of the backlight bleeding.

Display, Backlight & OS issue

Hi all,
So, I opened my Macbook Pro 13" Late 2011 this morning to find the screen behaving strangely. There was a blue tint spreading from the left side, like ghosting, but more streaky.
Anyway, first thing I tried was to shut down the Mac and start from a fresh boot rather than from Sleep.
I power up and the screen doesn't even switch on. No flicker, no power. Also, strangely, the keyboard backlight doesn't work either.
PRAM reset and SMC reset both tried - both didn't change anything.
So, I plugged the Mac into an external display and that functions okay - albeit the O/S refuses to boot because of a permissions error that cannot be fixed using Disk Utility.
I'm in Single User mode copying my data manually to an external hdd ready to reinstall Mavericks.
My question, ultimately, is three-fold.
1. Are the LED display backlight and keyboard backlight linked in any way by hardware that could have failed?
2. Is this hardware part of the logic board or can it be replaced separately?
3. Would the issue with disk permissions be linked to the display problem and could a reinstall of Mac OS fix the display issue???
Any more info you need, i will be glad to provide. Bear in mind I do not have a functioning OS to give logs etc.
Thanks,
James

You should do what's easy for you. Amazon or service center.
A product is replaced withint the first 7 days of purchase if proved defected.
You have warranty, so you should probably go to Sony service center and see what they say. Most probably you won't need to contact Amazon. While the Amazon deal is good as well. Get the money back and buy the SW from Sony center.
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Why won't my display backlight come on?

I have a unibody MacBook Pro purchased in late 2009.
Sometimes when I wake up my laptop I can see that the display has come on but the backlight that makes the display bright is not on. On other words, the screen is completely dark, but under the right lighting I can see that the LCD itself is on (windows are up, the cursor is moving around the screen) but there is no light making it all bright (i.e., the display backlight is off). When I put it to sleep and wait for the indicator light to start pulsing and then wake it up again it will off then come on, but of course I shouldn't have to do that.
Perhaps related or unrelated is my keyboard backlight also doesn't work. I can turn the brightness up and down using the F5 and F6 keys and the indicator will come up on the screen showing the brightness going up and down, but the keys themselves are not lit at all.
Was there a recall sent out about this issue? I do have AppleCare.
Thanks.

I have the same thing, not only my current Retina MacBookPro (Mountain Lion) but on my previous 2008 MacBook black (Lion). I find it very odd that I'd have the exact same issue on two different computers; there must have been a setting on the old one that got migrated to the new one somehow?

IdeaCentre B520 - sound recording too low, sound on Skype too low

Hi
When I speak on Skype or use Sound Recorder to record my voice (using internal microphone), the sound is very low.
I think I have turned up every possible Microphone and Audio setting on the system to its highest.
My IdeaCentre B520 is very new and I haven't installed anything else on it other than Skype.
OS is Windows 7 x64.
I used the Lenovo automatic check for drivers and it said all drivers up to date.
I haven't had a system with an internal microphone before, I literally just talk (loudly) at the monitor, I presume there isn't anything else I need to do?!
Thanks for any help you can give with this frustrating problem!
Patricia

Hello Patricia,
This is not good to know that you are encountering the issue with your new desktop.
Please make sure that the Audio driver version is 6.0.1.6294, if it is not then you may download it from the mentioned below web link.
http://consumersupport.lenovo.com/ie/en/DriversDownloads/drivers_show_4706.html
If the version of the driver is same then you can try the settings.
1. Right-click the icon of the speakers icon at the notification area, and then click “Sounds
2. Click the tab “Recording”, and then click “Microphone” à select “Properties”.
3. Select the tab “Listen”, and then check “Listen to this device”. Apply it, and the function will be enabled.
Best Regards,
Tanuj
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Tecra A2 backlight issue - image is very faint

Hi
I have a Tecra A2 with a backlight problem.
The LCD is displaying correctly, but without any backlight the image is very faint.
When the laptop is booted the display lights up perfectly for about 3 seconds before turning off. The laptop successsfully boots and can be used with an external monitor. If I now close the lid the laptop backlight lights up again for a few seconds before going off again. I have tried a new backlight inverter which had no effect. The lid closed sensor is the magnetic type (presumably a reed relay) and measures 100Kohms when open? and 0 ohms when closed.
Could this 100K be the problem?
Has anyone experienced any of these symptons or does anyone have any backlight inverter data, i'm wondering if I have a second faulty inverter.
Could this be a faulty FL backlight issue?
Any help would be greatly appreciated.

You are right Philip.
For me it looks like the faulty FL-inverter too
You said that the display on the external monitor looks fine. So we can eliminate a GPU fault.
I think your should contact the ASP in your country. The technician should check the faulty part (probably FL inverter) and should replace it with a new, compatible one.
>i'm wondering if I have a second faulty inverter
I see you have already replaced the one FL inverter and the issue still appears hmm to be honest I believe you have used a wrong one but who knows nothing is impossible.
So ask the ASP technician for the further handling
Best regards and good luck

Mac Pro (Early 2008) and HP LP3065 30" display compatibility issue

Hello!
Is there FIX / Workaround to Mac Pro (Early 2008) and HP LP3065 30" display compatibility issue ? ( +w/ ATI Radeon HD 2600 XT display adapter+ ). Its really annoying problem :-/.
Main problem is when i start my Mac, my 30" HP screen dosen't wake up, it always on suspend mode. Sometimes it wakes up on the 3rd try orso, sometimes it ruins my motivation, ideas and i give up (talk about inspiration killer). If i connect PC Laptop to that screen, sreen wakes up straight away. ATI says display adapters "drivers" are included on the OSX install. Great. Weird thing is i didn't recognize this problem at all 6-8 months ago, so i thought my system is fine. So i can't return my HP screen anymore.
My choices are to buy another 30" screen or buy different display adapter; there's two choices atm i think;
*-ATI Radeon HD 3870 512MB PCI-E for Mac Pro (~200€)*
*-EVGA GeForce GTX 285 Mac Edition 1GB (~500€)* (this one has seperate OSX drivers).
_Can anyone confirm if those display adapters work with HP 3065 30" screen ?._
http://forums.macrumors.com/showthread.php?t=687624
http://discussions.apple.com/message.jspa?messageID=9388978
http://discussions.apple.com/thread.jspa?threadID=1794155&tstart=60
Br,
Petri

Thanks for all information. I haven't been Mac user very long . I just want to get rid of my annoying problem. I'll do music composing mainly on my Mac Pro. So, it dosen't really matter what display card i'm using, i want to just make sure it works with HP 3065 .

Brand New MacBook Pro and Display Adaptor Issue

Hello fellow Mac users, I've been a long-time Mac user and owner.
I just got a new MacBook Pro after using a 2006 model for 2 years and am having a display adapter issue that I need help and advice with:
The new MacBook Pro has the mini DVI display connector, my non-Apple external display is does not support the mini DVI, no problem there, I bought the display adaptor...
Except that it doesn't fit the adaptor that fit the 2006 MacBook Pro.
Please See Image at Link:
http://picasaweb.google.com/lh/photo/sdjOcw1jrddqtAfjAU0Trw?feat=directlink
File comment: This is the adaptor that connected my 2006 MacBook Pro to the the display. It changes the connection from the Mac's DVI to fit the VGA connection of my display. There are the four extra pins around the flat pin to the left of the connector.
Somehow the male end of the mini DVI to the full-size DVI adaptor doesn't fit the female end of the full-size DVI to VGA adaptor! Please see the images. It seems a few extra pins prevent the connection!
Please See Image at Link:
http://picasaweb.google.com/lh/photo/4bG788QVKGCOIJUkzHcjKg?feat=directlink
Comment: This is where the problems begin. The flat portion lacks the four holes needed for the DVI to VGA adaptor to connect.
Is it possible to just remove the four offending pins in the Full Size DVI to VGA Male End?
Any help or suggestions highly appreciated, because as of now, my brand new MacBook Pro is less useful than the 2006 model, which can connect to my external display.
Thanks a lot for your help!

Hi Rob with a Mac and welcome to the boards.
My suggestion would be that you simply take the adaptor back and get a mini-display port to VGA adaptor instead.
I ran into a similar problem myself recently when I wanted to connect my own MBP13 to an overhead projector. I had assumed that I could use the mini display to DVI adaptor that I use for the DVI capable external monitor with my new MacBook, combined with a DVI to VGA adaptor that I had for my 2007 MBP, connected to a VGA cable to do the job, but this is not possible.
MiniDisplay to VGA adaptors for the newer MBPs are readily available at Apple dealers or through the online store and not too expensive.
Cheers
Rod

Lenovo IdeaCentre B520 - Plug in a Vhs and record my old vhs tapes!

Hi!
Besides of all i want to thank you for the time you gonna lose to read this post.
I bought a lenovo ideacentre B520 and i want to record my old vhs tapes.
I plug in the VHS into the AV in ports (yellow, red and white) and then i switch in the monitor to the av mode.
I can see the vhs tape in my computer but the problem is that i cant control the pc mode. I'd like to know how can i record the vhs tape in Av mode.
Thanks for the help, and sorry my english writing...
Cesar

You'd need to tell us what kind of film and cameras you have. I think you'll need to buy some equipment to do that.
An alternative is to send your film to a place like Integrated Imaging and they could transfer it to DVD or another suitable format for iMovie.

Ipod Touch 2g Backlight Issue

Hello all. I have a Ipod Touch 2g with a backlight issue. The screen is readable and all functions except the backlight work fine, but no backlight. No water damage or recent drops. I did a restore and the backlight started working again, but after my next sync and reboot the backlight stopped working again. To me this does not seem like a hardware problem. Are there any known issues with the newest version of the OS that might have caused this? Any ideas on a fix?

Interestingly, I just tried to update my applications through the App store on my ipod. The connection failed and suddenly the backlight came back on. Nothing new happened. I didn't move it, tap it, or anything else. This is very odd.

Ideeacentre B520 Display Shuts off after 1 minute

My b520 display shuts off after 1 minute. None of the windows setting seem to affect it. The user Manual for the system does not seem to address this. What am I missing?
Solved!
Go to Solution.

I found the problem. it was the lenovo dynamic brightnes system.

Need help finding the Motherboard parts number on Ideacentre B520

Hi guys,
I'm currently repairing an ideacentre B520 for a customer and need to have the MB parts # to have the parts ordered.
i've found a white sticker with somes number on it but I don't know which one is the MB parts number.
Here the number:
27*939530*126
1a*2
4*mfg: 1*2 (in bold)
PL*00:u0* (in bold)
46*9ae9*l01
and the last one on another sticker.
MB 11s1*013462z*0mP17*043 A*<
(I've put somes * instead of caracters on purspose.
Thanks

Hi,
The Motherboard part number starts with 11......
If you download the Hardware Maintenance Manual from the Lenovo Support site, all the part numbers are there, as well as removal instructions.
Good luck!
CB2011

Very strange backlight issue

I have a 600mhz (16 VRAM) iBook that I'm trying to fix for a friend. It has a strange backlight issue. Everytime the ibook is started, it chimes, and shows the screen (bright and perfect), but as soon as 9.2 starts to load, the backlight goes out. It is not intermittent, it happens at the exact same time every time I start it up (right when the progress bar starts to move). I reset the PRAM, which caused the computer to now look for a startup device, so all the extra time it takes search, the backlight is fine. Here's what I've tried.
In firewire mode, the backlight never comes on
With a hardware test disc, the backlight never comes on
Reset the PRAM (several times)
Reset the PMU (several times)
Any ideas out there?

As an update, I tried a Mac OS 10.4 startup disc which seemed to work, and the backlight came on with no problems. The machine did freeze on the welcome screen right after I selected english as the language of choice. So I tried a 10.3 disc which yeilds a kernal panic of "Unable to find driver for this platform: "PowerBook 4,3". After this, I tried a 9.2.2 disc which boots (takes 20 mins to boot) and when I try to load the installer I receive a "this program can not run on this machine", and it closes. This really seems like a strange problem. Any ideas?

PowerTOP: 2x Display backlight

Hi there,
On my Thinkpad X200T,PowerTOP shows me 2x power consumption for Display backlight.
See this screenshot: http://i.imgur.com/mP0H6hX.png
How should I interpret this?
Does my display use 4W in total or do I have indeed two different display backlights due to the tablet functionality of my thinkpad?
Or does PowerTOP interpret the display backlight twice because I have acpi_video0 and intel_backlight in /sys/class/backlight?
~ ls /sys/class/backlight
lrwxrwxrwx 1 root root 0 2014-04-02 19:18:40.580222111 +0200 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 2014-04-02 19:41:48.878394230 +0200 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
Is the double entry intended or should there be only one?
Thanks!
Last edited by orschiro (2014-04-02 18:18:37)

orschiro wrote:Furthermore, I think it only stores the current brightness level for restoring on boot, correct?
Yes thats what the man page says
# systemctl mask systemd-backlight@backlight:acpi_video0.service
will disable the service and result in a 100% backlight setting with no adjustment possible...
I think both are needed
EDIT: right I've just tried
# systemctl mask systemd-backlight@backlight:intel_backlight.service
and now my backlight setting is remembered and adjustable --- maybe this .service isn't needed. My powertop doesn't show actual wattage dissipation for some reason so maybe you could try this & report back on any changes in power consumption?
However, the systemctl man page does say to use the "mask" option "with care"...
Last edited by Head_on_a_Stick (2014-04-03 20:15:47)

Possible iBook G4 Backlight issue??

Hello All - Hope everyone had a great Holiday.
Here is my issue, I hope someone can give me some advice.
I am working with an iBook G4 1.07Ghz Model Number - UV4280JMR73 (if that helps?)
The computer really works like a champ most of the time. After running the computer for a short period of time (5-10mins) if you move the screen to re adjust the angle or just move the computer and the screen jiggles the screen goes black. If you look close in the right light you can still see the desktop and everything works fine, which I am assuming is a backlight issue. However, if you close the lid and let the comp go to sleep for 30secs - 1 min and than open it back up it boots right back up and the screen comes on just as bright as it should be and again if you jiggle the screen it goes dark again.
At first I was thinking that the CCFLs were bad but after researching a bit it seems that those guys either go out and never come back on, or work fine. I have thought about a loose connection but if that was the case you would assume that if you kept jiggling the screen than it would come back on, right??? Also it wouldnt make since because it all works like normal once you close the lid for a min or so.
Any thoughts???? I am pretty technically inclined and am not afraid to tear this bad boy apart. I work on BMWs for a living...
Let me know what your thoughts are and any possible fixs and also if you know of a good place to buy parts if I need them and also if there is a walk through on the web that you know of.
Thanks so much to all of you that read and I wish the best to you in the new year.
Thanks, Jack.

jjp,
Well like S.U. says, it sounds like the inverter cable. Typically this breaks near the hinge point. I've repaired two like that. I found the open by continuity testing from the inverter board to the plug on the logic board. Once I found the open cable I could make it come back by pushing it together at the break point. I then opened it up, re soldered it and used shrink tubing to re insulate the break point. I then reinstalled the coil flex or silver sleeve and put it back together.
The danger in having an open there is that it can short out and kill the inverter driver (for want of a better word). If you're lucky it will just take out the fuse in that area. I repaired one like that and had no idea what that fuse was (read open) but compared it to another one that wasn't burnt and bridged it with a .125 (I think) fuse filament.
BTW if you need good take apart info email me.
Richard
Message was edited by: spudnuty
Message was edited by: spudnuty

IdeaCentre B520 display backlight issue

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