Pismo with backlight issue
Hi all,
I am having a problem with my 400 MHz Pismo. Everything boots just fine, but the screen is dark ~ you can barely see the desktop. So I replaced the entire screen assembly (thinking it was the back light), still dark. I replaced the inverter board, still dark. I even replaced the processor, still dark. Any suggestions?
Message was edited by: mercuryc78
Here's the troubleshooting info from the service manual.
No display, but computer appears to operate correctly
1. Connect power adapter.
2. Adjust screen brightness using keyboard controls.
3. Verify display cable, inverter board, and I/O logic board connections.
4. Connect external, known-good monitor.
5. Verify inverter cable is properly connected.
6. Replace inverter cable.
7. Replace inverter board.
8. In the U.S., contact Apple Technical Support.
9. Replace display cable (international only).
10. Replace display (international only).
11. Replace I/O logic board.
Backlight doesn’t operate; screen is very dim
1. Adjust screen brightness setting.
2. Verify backlight cable connection is secure.
3. Check display cable and inverter board connections to the I/O logic board.
4. Verify inverter cable is properly connected and that cable is good.
5. Verify cables are not pinched or severed.
6. Replace inverter board.
7. In the U.S., contact Apple Technical Support.
8. Replace display (international only).
9. Replace I/O logic board.
Cheers, Tom
Similar Messages
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I have a Pismo that I had been using as a second computer and recently as an internet gaming device for my daughter. For the past two years it has had a shut down issue. No matter how I tried to shut it down it would only restart. Most of the time I kept it in sleep mode and this was not an issue. Lately my daughter has been using it and when she was done would unplug it. When repowered it would cheerily respond. Every once in a while throughout this period it would not reboot but would instantly respond to the reset button.
Now it is dead. It does not respond to the reset button (which now feels like it is not clicking in) The battery has long since passed on, so I usually run it off the power adapter. I have swapped a power adapter from another working Pismo with no luck. I have unplugged the PRAM battery and even unplugged the keyboard. Nothing seems to rouse it.
Is there anything else I can do to further a diagnosis ? Does the sequence of symptoms point to any particular part(s) ? Is it worthwhile having it diagnosed at a shop?
Thanks for any insights...Carol
G4 TiBook Mac OS X (10.3.9) G3 FireWire PowerBookCarol,
The symptoms of restarting when you want to shut down and also automatically starting up when you plug in the power adapter is usually caused by corrupted PRAM. The article below does not mention the newer black G3s so it may not apply.
http://docs.info.apple.com/article.html?artnum=19155
If a PRAM and power manager reset do not solve the issue, some hardware component has failed. I can only recall one example of this and the logic board was replaced.
There are many software conflicts that can prevent the powerbook from shutting down but these would not cause the powerbook to start up when you connected the power adapter.
I only have a few more suggestions which you may want to try...
- Strip the 'book down to its essentials: Disconnect the keyboard, remove main battery and optical drive, and disconnect any peripherals.
- Apply firm upward pressure on the power adapter plug at the rear of the 'book while pressing the power button. If the solder joint has failed at the power port, you can sometimes make a temporary contact in this manner.
- If no success, remove the microprocessor card and the memory module on the bottom side, then reinstall the microprocessor card. If bad memory is the problem, removing the RAM should at least give you one of these sounds:
http://docs.info.apple.com/article.html?artnum=58442
- If you do get a response after removing the RAM, try each module in the upper slot.
Do NOT remove the heat tube from the top of the microprocessor; remove the microprocessor card and heat tube as one unit.
http://docs.info.apple.com/article.html?artnum=50028
- If still no success, remove the HD and HD ribbon cable and see if it will start up to the flashing '?'.
Message was edited by: jpl -
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 RulesYes, 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. -
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.
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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?
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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 -
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 -
Nokia 925 Screen - AMOLED but with backlight that ...
Hi guys.
This "issue" is mostly noticable when glance is enabled and on-screen all the time. The thing is that the whole screen has a light backlight light always on, just like the 920 has. I thought that the putpose of the AMOLED screen is basicly that each pixes is its own light source? I can understand that backlight is usefull under bright conditions but in the dark... why is that? How can this be fixed?
Thank you.Hi,
This is quite normal behavior as AMOLED screens can have a faint glow which is visible in very dark conditions. This has nothing to do with backlighting (like in LCD displays) and it is actually caused by current leakage through the diodes. Depending on many factors including density and sensitivity of the light emitting diodes, different panels will exhibit more or less glow and you can expect to see variations even in units which have exactly the same panel model.
In some cases due to variations in the manufacturing process it may also possible to see that the glow is not uniform with some areas slightly darker than others. That is again part of the normal functioning for a screen and will not impact its performance and accuracy.
I'm working at Nokia, but all my posts represent my own views and these should not be mixed up with Official NOKIA statements. -
I have an olde iMac that once I have an older iMAC that once burned CD's with no issues. Now I get an error message saying "The attempt to burn a disc failed. The device is not accessible, probably because it was removed". I have never had it touched so the device was not removed. Please advise as to what could be the problem. How to fix. Thanks
Try resetting the SMC and PRAM first, if that doesn't help try a cleaning disc.....and then buy an inexpensive external burner. Slimline super drive failures are all too common.
To reset the SMC
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys. -
Question for those with memory issues on k8n neo plat
I have been having issues with my memory on the k8n neo platinum board since i built the system last month and i just recently discovered a fact I had overlooked.
I Have discovered that if i test the system while it is cool (having sat turned off overnight for example), then memtest will pass the ram just fine and the system will be stable for a short period of time, generally longer if no intensive applications are used, ie. doom3 vs. websurfing).
This system, once it heats up ( seems mostly to be the nvidia 3 nb that needs to be "hot"- that is, a probe placed in contact with the module reaches about 58+ degrees c) then the system becomes unstable and memtest, if used, fails.
Prime95, if used on it when its cool, will usually take about an hour or so to fail, but if its used on the system when its been running a bit ( temps from nb at 58c+ and memory module hot to the touch) then it fails after about 20-30 seconds.
I have placed an active hs on the nb in an attempt to correct this, but temps still remain high with failures occuring.
I have spent the better part of three days testing the sytem this way and the above facts have held true in all these tests.
I have tested at stock ratings ( not using "auto" in bios, but using "approved ratings" of 10 x 200 for fsb and timings of 2-3-3-7 for my ram at 1:1 (which is recommended as well) since i am testing for base stability at this point;Voltages have been left at auto settings, however.
I was wondering if anyone else with memory issues could try this out and post if this seems to be the case for you as well.
Perhaps the memory issues on these boards are directly related to a problem with the nvidia 3 chipset running too hot?
Does anyone have a memory issue with these boards who is using water cooling on the NB ?
Lack of issues from people using 'problem" memory, but having no failures with water cooled nb's would support my assumption.Yes i did mean chipset.
I am using a stock hs/fan from amd, which seems to run a tad hot but, considering that I wont overclock until I can get board stable, its not an issue. (runs 35-40 idle and up to 72 intensive). I need the warranty more then the extra mhz at present.
I removed the stock heatsink from the nvidia chipset and bought a generic chipset cooler (green, very little in the way of fins and seems to be aluminum) with a small fan.
I used a generic silver paste from Compusa to adhere both the cpu hs and the chipset.
I didnt lap either hs, just installed each as per instructions on artic silvers website (figured it had to go on the same way even generic).
I also bought a kingwin thermal center which i ran probes from to the cpu, case, and nb chipset.
I am not using it to adjust fans so those arent connected - its just a reference temp I can see at a glance, esp considering the funky bios reading this boards been known to give.
I assume from these responces that even a nvidia 3 250 chipset shouldnt get as hot as mine?
I asked about that from the retailer i bought this from but he seemed to think it was "ok" at 50ish celcius, but then again he didnt look too confident when he said it, lol.
Idle right now reads on Corecenter at 28 celcius for cpu and 33 celcius for the chipset, although, I have readings of 37 c and 43 c from the kingwin thermal center, which i believe to be more accurate.
My voltage reads at 11.67 for the 12v line at idle right now.
The psu i got is stick from the xblade case i bought in store. (http://www.xoxide.com/xblade2.html)
I have a dvd burner, cd drive, and two maxtor ide hd's attached to the system;The only card is the agp.
Is there a way to check and see if the cpu ispower starved? software monitor or even an external probe perhaps?
I havent put a probe on it, but the ram came in its own heatspreader, which gets very hot to the touch as well.
What temps should I be looking for on these items? -
Is there an issue with the hitachi hard drives in the MacBook Pro's ? Got a 15 inch and a 13 inch at the same time and both drives have failed in under two years. I have heard from a few other people with same issue. Other drive I have had have lasted at least 5 or more years.
there is a dylib you can put in the springboard if jailbroken but if not you have to find an apple store
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Sales orders with credit issues taking availability stock
Hi,
I am doing confirmation using Global ATP in APO. The confirmation is well done, but the confirmed quantity for sales orders with clients that have credit issues is taken the available sotck for other sales orders with ok clients that I want to confirm the quantity they ordered.
For example:
Stock: 10 PC
Client A order 15 PC and 10 are confirmed, but the ordered is retained becuse of credit issues with client A.
Then client B order 3 PC, but nothing is confirmed because the ordered for client A is reserving the stock (note: this would be ok if client A had not credit issues).
So, I want that the 3 PC for client B are confirmed and the 10 PC not reserved for the cient A while client A has credit issues.
How could I configured, so that the orders with credit issues do not reserve stock for the incoming orders?
Thanks a lot.Hi DB49,
thanks for the quick answer.
I checked the configuration in the R3 and seems to be fine. To prove it, I disconnect APO and did the availability check in the R3 system and it is working fine; the orders quantities that are blocked because of credit issues, do not reserve stock for incoming orders.........son new incoming orders are well confirmed.
But after connecting APO the problem continues. I checked the next points.
In R3 transaction CO09: takes to the APO screen and you see the ATP available quantity OK (do not consider the quantities of the credit issues orders). But at the moment that you make the order (VA01) it does not confirm any stock and if you select the line and go to the ATP screen (the same you get from the CO09) the quantities of credit issues orders are taken into account..the ATP availability quantity changes from the first going directly from the CO09.
What could it be?
Note: it was working fine with APO, I started to have the issue after implementing note 1262475 in APO. This note was becuase the BAPI_APOATP_CHECK was not brigning any value for the ATPQTY_***.
Thanks a lot!!! -
I have a report which have year(2008), Category(0-1,2-3, ALL), product(0,1,2,3,4..), % sales. I group by all the category elements and called it as All, I am not getting the right percentage sales for the Category ALL other wise for 0-1,2-3 i am getting it right. Please advise where i am doing it wrong. please find the blog for a screen shot of my issue.
http://ravibiblog.blogspot.com/2012/04/report-with-grouping-issue.html
Thanks,
RCPl post details of OS, database and EBS versions. Pl see if these MOS Docs can help
FARXPBSH Failing With "Program was terminated by signal 11" or "Program was terminated by signal 10" (Doc ID 742729.1)
Publishing RXAPPYAC: The FARXPBSH Ends With 'Signal 11' Error (Doc ID 432797.1)
RXi RX Reports Failing With Program Was Terminated By Signal 10 or 11 Errors After FA Rollup Patch 6 (Doc ID 737963.1)
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HTH
Srini -
I am using Windows 7 Home Premium 64-bit OS.I've never had this problem before... today I opened iTunes and it prompted me to download the newest version. I use iTunes all the time and have updated it multiple times with no issues. During the installation process it gave me an error message that said:
Runtime error!
Program C:\Program Files\iTunes.exe
R0634
An application has made an attempt to load the C runtime library incorrectly.
Please contact the application's support team for more information.
I quit the installation, uninstalled iTunes and rebooted my computer. I now receive a similar message with a slight difference:
Runtime error!
Program C:\Program Files (x86)...
R0634
An application has made an attempt to load the C runtime library incorrectly.
Please contact the application's support team for more information.
I did not leave anything out from the error message. It doesn't point to a specific file, it just ends with "(x86)..." Every time I boot up my computer, this error message pops up on my desktop.
How do I repair this issue? I have found multiple suggested solutions but am unsure which one is the best, and I don't want to try a bunch of different things for fear I may make the problem worse. I would like to try and fix this myself if possible but I need to know if that is really possible or if I need to take my computer to someone for repairs. Any suggestions will be greatly appreciated!!Hi lustyln,
I'm having a little trouble understanding all of what you are trying to explain. From what I can tell, it sounds like your PC has a lot of software problems and you want to know what is supposed to be there and what isn't.
For reference, here are your product specifications:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c01893242&lc=en&product=4043282
To get your PC software back to how it was when it was first purchased, run a system recovery:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c01867418&lc=en&product=4043282
I hope this helps.
...an HP employee just trying to help where I can, but not speaking on behalf of HP. -
after upgrading to mountain lion i keep getting an error message saying my startup disc is full. it shouldnt be full because there is barely anything on there and i was running windows with bootcamp prior to this with no issues. my computer now freezes and programs close randomly. The usual command for opening windows with bootcamp doesnt work. once in restarted my computer after it froze and it rebooted in windows automatically. i really just want to know if there is a way to take the upgrade off my laptop because it is very annoying.
Hi Memalyn
Essentially, the bare issue is that you have a 500GB hard drive with only 10GB free. That is not sufficient to run the system properly. The two options you have are to move/remove files to another location, or to install a larger hard drive (eg 2TB). Drive space has nothing to do with SMC firmware, and usually large media files are to blame.
My first recommendation is this: download and run the free OmniDiskSweeper. This will identify the exact size of all your folders - you can drill down into the subfolders and figure out where your largest culprits are. For example, you might find that your Pictures folder contains both an iPhoto Library and copies that you've brought in from a camera but are outside the iPhoto Library structure. Or perhaps you have a lot of purchased video content in iTunes.
If you find files that you KNOW you do not need, you can delete them. Don't delete them just because you have a backup, since if the backup fails, you will lose all your copies.
Don't worry about "cleaners" for now - they don't save much space and can actually cause problems. Deal with the large file situation first and see how you get on.
Let us know what you find out, and if you manage to get your space back.
Matt
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