Something loose on logic board controlling display

So, I was wondering if anybody else has had a similar experience here. My displays some veritcal lines, so I give the case a good tap or jiggle around something in the USB port and it goes back to normal for a bit. Any suggerstions? I also recently had my logic board replaced (actually twice in a row). This started after the second time. Here are some images to give you a better idea.
My system setup is i7 @ 2.2GHZ and
AMD Radeon HD 6750M 512 MB
Late 2011
Before wiggle or tap .....
After wiggle or tap

I think I might have fixed the problem...
I noticed that the probelm went away when I depressed a particular part of the case (near the tab and tilde '~').
So, took of the case and saw that there were depressable contacts coming out of the logic board that should be touching the case. I disconnected the battery and took a multimeter to see if the contacts were connected... they were! So, I cleaned the parts where it looked like there should be contact made the case and viola! No more lines.
I guess the problem was, contacts on the logic board that was supposed to be touching the case were not.... I think.

Similar Messages

  • 2x iMac G5: Both Logic Board and Display Problems, Warrenty?

    Hello,
    Thank you for looking at this topic.
    I am Jeroen from The Netherlands and proud owner of several Mac Mini's, iMac's and Macbook's. I have 2times the iMac G5, a beautiful machine, but both not working since 2 months.
    I have two times the iMac G5 with iSight, both have logic board and display problems.
    The first iMac doenst start at all, black screen, i hear the chime, but nothing happening. After a minute i see one horizantal white stripe but nothing happens.
    The second iMac has weird horizantal stripes also, but the computer starts. It gives a finder and questionmark icon. After a while the fans go crazy.
    Both these symptons are widely known on the internet. I would like to get this fixed, but prices are crazy. And because this is a common issue I would expect to get this fixed for no costs. I have contacted several Apple resellers but they shown me high prices and bad services. On these forums I've saw people in the USA who get this fixed free of charge.
    Does anyone has any advice for me? I'll call apple USA this morning.
    Thankyou for ur time.

    Welcome to Apple Discussions.
    I know of no repair extension authorization which provides for the repair of either computer you describe beyond its original 12 month period of coverage. If either machine is covered by a warranty extension program provided by AppleCare, then the parts, labor or both required to replace the defective components may be offered at no charge to you. Final determination of eligibility is made at the part level by authorized Apple service providers or dealers and by the specific serial number of the machine submitted for service.
    Absent a warranty extension, however, it is quite likely that you will have to pay for the repairs is you elect to have them performed.

  • New logic board, and new display, but now completely dead.

    Hi guys,
    I've got an iBook G3, running 10.3.9.
    In December 2006, the logic board failed, so I bought a MacBook, because I didn't have time to be offline waiting weeks for Apple to replace the iBook's logic board.
    After much badgering, Apple reluctantly replaced the iBook's logic board under the extended warranty program.
    While the iBook was with the Apple repair store, they replaced the display for new as well, even though I didn't ask them to, and even though I wasn't charged for it.
    I presume that was because the store discovered that the display was duff enough to be replaced under another extended warranty program.
    When I got the "repaired" unit home, with a brand new logic board, and a brand new display, I turned it on, and it seemed to be working fine, so I turned it off, and continued to use my MacBook.
    A few weeks ago, the second logic board on my MacBook failed (another long horror story entirely), so I began using the iBook for the first time since it had been "repaired" some six months earlier.
    Almost immediately, the iBook began exhibiting a major problem, specifically that I'd be typing away, and suddenly the display would go black.
    I could just about see the icons and documents on the screen, but the unit was unusable.
    So I pulled restarts, full shutdowns, disk utility, zapped the PRAM, etc, all to no avail.
    It seemed to be an intermittent problem.
    For example, sometimes, from a cold start, the unit would work for two or three hours until the display went black.
    Other times, I'd pull a cold start, and it would go straight to the black display.
    By chance, I discovered that if I gave the iBook a shake, the display would come back on.
    But then it would go black after a second or two.
    And then with another shake, it would come back on for a second or two.
    And then it would go black after a second or two.
    And then with another shake, it would come back on, sometimes for a couple of hours at a time.
    So I figured that it must be a cable which, during the installation of the logic board, and/or the new display, wasn't seated correctly by the technician.
    I phoned Apple, and told them about it.
    They said that because I had reported the issue beyond 90 days since the logic board had been replaced, it was no longer Apple's problem.
    I explained to Apple that I hadn't used the iBook for six months, because I had a MacBook.
    After much badgering, Apple has agreed to replace the logic board if it's faulty.
    However, Apple has refused to replace the NEW display, even if that's also faulty.
    Apple is also insisting that I have to pay all the labor charges.
    Meanwhile, I've noticed that the iBook is now incredibly hot.
    I mean, the MacBook is infamous for running hot, but this "repaired" iBook makes my MacBook feel like a block of ice by comparison.
    I don't remember the iBook running so extremely hot before the "repair."
    Which has made me notice that during the last few weeks, I've never heard the iBook's fan come on.
    I presume that an iBook has a fan ?
    Please confirm.
    Therefore, another loose cable ?
    Today, the display went black again, as usual.
    So I gave the iBook a shake.
    But this time, nothing happened.
    No display.
    No fan.
    No hard drive spinning.
    Just silent and dead.
    What do you reckon, guys ?
    Duff logic board ?
    And/or duff display ?
    And/or duff fan ?
    And/or duff cabling by the technician ?
    As far as I'm concerned, I don't see why I should have to pay for yet another repair, to correct hardware and/or workmanship which was so bad that after only three weeks of ACTUAL use since the "repair", the unit is now completely dead.
    All opinions and advice gratefully received.
    With thanks and best wishes,
    Michael
    London, England

    Hi S,
    Many thanks for your helpful and swift response.
    I agree with you regarding the likelihood that these problems would have surfaced immediately during normal usage, regardless of how much or little time had passed since the repair.
    As advised, I will inform Apple Customer Relations UK about the new developments.
    Indeed, when I resubmit the iBook, I'll include a print-out of this discussion.
    I agree with you about the fan.
    Prior to the failure of the first logic board, I ran that iBook for YEARS, without noticing any heat issue.
    Indeed, if there had been such incredible heat, then I'd have searched these discussion boards, and reported it to Apple HQ.
    Therefore, the astonishing heat is definitely a new development since the "repair."
    Consequently, I take on board your comments about the lack of a working fan since the "repair", which I shall also mention to Apple HQ.
    As for running the Apple Hardware Test, the unit is completely dead.
    The power cable is green, but the unit is now completely silent and black.
    I also note your suggestions regarding the cable which connects the display to the rest of the unit, which I shall also mention to Apple HQ.
    No repair sheet was ever given to me by the Apple Repair Centre (ARC).
    Indeed, no receipt was ever given to me when I delivered the unit to the ARC, nor was any paperwork ever given to me when I collected the unit from the ARC.
    However, Apple HQ can see on their screen that the logic board and display were both replaced for new by the ARC.
    What else was and wasn't done by the ARC is a mystery.
    I'll phone the ARC and ask for copies of any and all paperwork, so that I can submit it all to Apple HQ, which I note is your recommended option, rather than returning the unit to the ARC.
    However, the complicating factor is that with the exception of the logic board, it is my understanding that Apple is denying any liability on any part of the "repaired" unit, including the brand new display.
    If I understand Apple HQ correctly, they're now saying that all other hardware and labor costs will be mine.
    I'm sure I could buy a WORKING second-hand iBook G3 for the same price as a repair, if not cheaper.
    Therefore, perhaps I should return the unit to the ARC, and give them the opportunity to correct their previous workmanship, at their OWN cost.
    Because as far as I'm concerned, the ARC had two customers during the repair: Apple and the end-user, as evidenced by the fact that the ARC has invoiced its first customer Apple for workmanship which was clearly not up to Apple's own standards, and the ARC has then delivered the unit to its second customer, the end-user.
    In addition, regardless of Apple's 90 day warranty on repaired hardware, UK law includes the Sale of Goods Act 1979, and other relevant legislation: http://www.dti.gov.uk/consumers/fact-sheets/page38311.html
    Furthermore, if the ARC is completely unhelpful, I could jump all over them, by writing to Apple HQ, with cc's to the UK editions of MacWorld, MacFormat, and MacUser magazines.
    As advised, if the unit goes to Apple HQ, I will suggest that the unit is looked at carefully during disassembly, to see if errors were made during the ARC "repair."
    I'm always polite when on the phone to Apple, because I love the company so much.
    Indeed, even though during the last twelve months, I've been having very bad luck with the iBook, as well as with a MacBook which has exhibited so many problems that Apple has now agreed to replace old for new, I still love my Mac.
    And joy, sweet joy, I've just seen on the TNT courier's tracker website, that my replacement MacBook, built by Apple in Singapore, then flown to Arnhem in Germany, then flown to Northampton UK, then delivered to Heathrow UK, left the Heathrow depot 30 minutes ago, for delivery to the customer.
    And the sun is shining.
    Thank you again for all your kind and wise advice.
    With best wishes,
    Michael
    London, England

  • New Logic Board = Significanlty Slower Mac

    Recently I had my Macbook Pro shipped off for repairs for a number of problems I've had with it, and they ended up replacing the battery, superdrive, logic board, and display wiring. Since I've gotten back, my mac is noticeably slower. Boot up time has increased, And there is a one or two second delay in doing simple tasks like right clicking on the desktop and having the menu pop up, or double clicking a buddy in iChat to bring up a new chat window. I've used this computer for several hours a day, nearly every single day for the past 2 years, so I am very familiar with how long it takes to do different tasks. Any ideas as to to fix this?
    I very reluctant to have to send it in again, because I use it for work, and I had to miss a week's worth of work to send it in the first time, and I can't afford to do that again.

    Could you start Activity Monitor Application and see if anything is using lots of CPU or memory? Also could you open Terminal.app and type 'sudo dmesg' without quotes and then post the output?
    One other thing to check is to go to System Profiler (Apple Menu Icon -> About This Mac -> More Info) and then check the status of the disk drive - it should say SMART Status verified.
    If some process is hogging the CPU it may explain the slowness. What 3rd party software do you have installed?

  • Would I be able to boot from USB on my Macbook Pro if my logic board was damaged?

    My macbook pro recently started to slow down, programs freeze, etc. Odd behavior. So I decided to install a clean version of os. My hard drive came up as corrupt, I need to repair. So I did that. And was unable to install to os. It starts up and then says that the installation has failed, but yet I'm able to install it on an external hd and boot from that installation. Is it my hard drive? Or is something wrong my logic board?

    If you can successfully boot and run OSX from the external harddisk but not from the internal harddisk, then it is most likely that your internal harddisk is defect and not the logic board.
    Nonetheless you should run the Apple Hardware Test Intel-based Macs: Using Apple Hardware Test to check your Mac.
    It might be that the internal SATA-harddisk connection is defect.
    Stefan

  • Got new logic board, now  software is making me go through authorization?

    i just got a new logic board installed on my 2007 MacBook Pro. now any time i open any of my software it makes me go through the authorization process (asking for serial #) - its as though with the new logic board the software actually thinks that its been installed on a whole different computer. just wondering if this is normal or if there is any way to get around it. I do audio production on my mac so I have literally hundreds of different plugins installed many of which have complex product authorization schemes. Thanks in advance for the help.

    +*its as though with the new logic board the software actually thinks that its been installed on a whole different computer*+
    That's exactly what's happening. Most modern authorization/activation routines look at the hardware giving specific values to various components. When something like the logic board is replaced, the application pretty much sees that as a different machine.
    I believe Apple does have the ability to set the serial number in a new logic board... although it has to be done by Apple. This alone may not bypass the need to reactive some of your applications. It depends on the specific activation scheme the application is using. You're probably best off just re-activating your applications. I've never had problems getting software re-activated when dealing with the software vendors due to this situation. Fortunately, OS X itself doesn't require activation. As something of a techy... I've replaced motherboards on desktop systems regularly and even Microsoft has never given me a problem with reactivating Windows.
    It might be a pain... but hopefully you'll just have to go through it once.

  • Can you tell if it is a display problem or logic board problem

    I have a 17 inch aluminum mac book pro. I bought it from a reseller on ebay in February. Recently I have been having some display issues. It has taken it longer and longer for screen to come back on from sleeping and the other day it did not come back on at all. I thought it could be a faulty graphics card because it is one of the models that has the faulty card in it but when I took it to my local mac authorized dealer they said that because there was damage to the hinges of screen, they thought it was a display issue and suggested I get a new screen for upwards of 900 dollars. While testing it they plugged it into an external display and the screen turned on for a few seconds. When they closed it, it did not come back on. Back at home I did a similar test and plugged in an external monitor and it worked for a while but as soon as i turned i closed the lid the display went off again and now I cant get it to display even when connected to external monitor. WHen i turn it on i can hear the chime and i can control the volume and keyboard brightness. My question is whether this is a simple display issue, a faulty graphics card issue, or a logic board issue? Please help me. I am going to fix the computer either way I would jsut like to know if it is a screen issue that I could replace myself.

    If the Macbook Pro was made between 2007 and 2008 it maybe the Nvidia issue.
    I suggest you take it to an Apple center and have them run the test.
    The damaged hinge should not affect the test, I would think.
    Be warned though, just because you have exactly the same symptoms does not mean it will fail the test or more importantly, if the test does not generate a fault code, Apple will not repair.
    Did this start after the 10.5.7 update and more importantly did you run the SMC 1.3 update as well?
    If you can get the machine to start properly, deleting the /var/vm/sleepimage seems to eliminate the symptoms of not waking. Before you delete is take note of it's size.
    It's my opinion that this file also caused the machine to hang after the SMC 1.3 update when the lid was closed the first or second time. The machine then continued to run generating lots of heat. You may not have noticed and just found the machine with a flat battery one day.
    If that is the case, damage is done and the symptoms are the same as the Nvidia extend warranty issue except not covered!

  • Can an external display work if logic board is broken?

    Recently I had my early 2007 24" iMac's graphics card fixed. Three weeks later the main screen went all black but my external screen works and I'm able to use the computer just fine when I mirror the display.
    I gave the imac to the same repair place that changed my graphics card and they saying the logic board is broken.
    I was thinking the problem was display cable or something but logic board is a much more expensive thing to repair so wanted to  double check here if its even possible for the computer to work with an external display if logic board is broken?

    The correct version of the AHT works just fine on all Mac's. But you need the correct version of it.
    For the Late 2011 models that is only available as a Online, Internet Boot system where the computer is booted from over the Internet.
    Restart the system and at the chime hold down the Option+d keys until you see a spinning globe in the center of the screen. Then once it full boots and you select a language run the test.
    Also it is best to have the computer Wired to your internet router with a cable.

  • (HELP) Dead MacBook Pro.. possibly something to do with the logic board.

    I had been noticing my MacBook Pro's performance degrading lately.. for example whenever I dragged a file into a folder it would lag for 5-6 seconds and then copy over. It started to bug me so I guessed that maybe a reinstall would fix the problem. After reinstalling and rebooting, I got no video on the display.. keyboard wouldn't work.. only things that happened was the disc drive made a sound, light came on the font and could hear the HDD spinning a little.
    I then took it to the Apple store as thats what Apple told me to do on the phone. So we took the loverly 3 hour drive(there and back) to the closest Apple store just to have the man take it out the back for 2-3 minutes and then come back to say "It's possibly the logic board that is dead".
    I am out of warranty by 2-3 months and so he told me I would have to pay £700 or so to repair. As a full-time student I don't have that kind of money.. I don't even have £60. - I find it annoying how they didn't even fully check the problem out.. just a "possibly the logic board".
    So what if I manage to click my fingers and have £700 appear right before my very eyes? I pay for the new logic board just to find out thats not really the problem? or maybe have the same thing happen again right after the 90 days that logic board is covered for? meaning I have to fork out another £700.
    I am a massive fan of Apple.. I love their products. I have brought so many products of theirs.. now just 2-3 months after my warranty runs out.. I get this. They didn't even say sorry for selling me a faulty product and didn't offer to help out in any way. When I spend £1,299 on something I expect it to last A LOT longer than a year and 3 months.
    I need my MacBook Pro very badly for College but now I can't do my work and if I want to do my work, I have to pay £700 for it.
    What do I do? Who do I talk to? Is it possible to get it fixed without having to pay that kind of money?
    I can't settle for anything less than a Mac. I love the OS way too much and need so many of the apps that are Mac-only. So no way am I going to forget this and buy myself some cheap PC CrapTop.
    - iTomath

    Unfortunately, if you cannot boot from the disc, it won't be possible to do any diagnostic tests yourself.
    It might be worth getting a second opinion. Is there an Apple authorized repair shop anywhere near you? If so, possibly you could take it there and see if they can diagnose it. You may need to pay a small fee for them to do this. But possibly someone might take a little more time with it and be able to give you a definitive diagnosis.
    I'm grasping at straws, but you might be able to try resetting the SMC:
    http://support.apple.com/kb/HT1411?viewlocale=en_US
    I don't know if this would help or not--there are not many things to do when the computer is unresponsive and you can't use the keyboard or a disc.
    Unless the problem was reported to Apple while the MBP was still under warranty, I don't think there is any way that Apple would be able to fix it under warranty. Did you ever take it in for any problem under warranty that might relate to its current situation?
    I don't know if you might be up for trying to fix it yourself. If you are, here is a site that might be of help:
    http://www.ifixit.com/
    You have my sympathy--this has to be an exceedingly difficult situation for you. I will continue to think about this, and will post back if anything comes to mind.
    Good luck!

  • Display problems, bad logic board?

    Hi I'm a first timer here! I have a iBook G4 14" 1.33ghz laptop I am fixing for someone. When it boots up, the screen looks like you are watching TV with old rabbit ears. You can make out the mac logo and what not, then the screen goes blue, like the basic blue background, and it looks perfect, then once the desktop comes up, it all fuzzy again. I've replaced the LCD screen, AND the lcd cable that connects to the logic board. Same results. I guess the last part would be the logic board to replace? Does anyone have any suggestions?
    Here are some links to the pictures to show you what is going on...
    http://www.tylersweb.net/mac/1.jpg
    http://www.tylersweb.net/mac/2.jpg
    http://www.tylersweb.net/mac/3.jpg

    inverter board controls brightness, the lines in your pics look more like the logic
    since you have a stick of RAM, try another module or maybe remove it if you have on-board RAM
    would be good to connect to the external display if the adapter is available - it would confirm bad logic board if the same lines are on the external display, it wont completely rule out the board though if there are no lines

  • Logic Board Replaced -Nvidia Control Panel Missing

    Hello kind readers and helpers,
    My laptop had to have the logic board replaced (twice) because of a faulty Nvidia GeForce 8600M GT card.
    Upon its return, the Nvidia Control Panel was missing from the System Preferences and I'm now limited to the
    adjustments I can make to the screen. The Nvidia Control Panel used to be there before the board got replaced.
    I really need access to more detailed adjustments as I edit photos and video on my laptop and the current
    display setting adjustments available in system preferences are just not cutting it... I need my Nvidia Control Panel
    back!!
    Can anyone tell me how to achieve this? I went to the NVidia website to try to download the drivers, but they
    have no support for laptops!! Ough, faulty graphics chips and no laptop support!! Really?!
    Please help me guys!!!
    Thank you so  much! =)

    Laura Carlos wrote:
    Hello guys,
    Just FYI, with the Nvidia Control Panel the resolutions available to me were much higher than those available in the display system preferences; 2048 x 1536 at 85Hz (VGA) and  2560 x 1600 at 60 Hz (DVI). Now, the highest resolution available is 1920 x 1200.
    Thank you for your time and support! =)
    Ahhh, now it's making sense. You have a 17" (I have a 15"). 1920x1200 is the highest resolution possible on the built-in 17" display. Your MBP can output 2560x1600 to an external display, but that's dependent on the external display's capabilities. I wonder if that Sys Pref you're asking about only shows with an external monitor? Would that fit your experience?

  • Problem with display, sound...logic board?

    Hello,
    I hope someone can help me with the issue I am facing.  I am using an early 2008 Macbook Pro laptop and just recently I noticed an obvious ongoing sound that I can actually only explain it by inserting a recording of it but I am not sure if I am able to do that in here. Then all of a sudden the cursor became like this (instead of the usual arrow):
    http://media-cache-ec0.pinimg.com/236x/ff/76/08/ff7608f6300b109e69f992f699809c4a .jpg
    and became unresponsive to whatever I clicked on...
    Also the keys didn't work so I wasn't able to do any shortcuts..
    I tried closing the shell and reopening it but this time, the display's brightness became dark but I could still see what was open when I put a flashlight at the display (it was at 0 brightness)
    I had no choice but to shut it down by pressing the on/off button and when it shut down, the clicking sound didn't come on like it always did before, but it was a soft shutdown.
    After I turned it on, the light on the front bottom turned on but for a few seconds only. Now it's not on at all (not blinking like it used to)
    By the way, I got my logic board replaced by paing $310 due to failure last summer so I am just really worried it may be the samething??  This is ridiculous if that's the case because I have no warranty and it's not even a year old!

    I have the exact same problem on the exact same model. Got the problem after ~2.5 years of  purchase of the laptop. The service center guys couldn't find a new motherboard here in India, so they imported a similar on of Compaq brand with a different graphic chip on it (ATI Radeon HD6300M) after a month or so. But I'm facing the issues again after 6 months and I'm out of my extended warranty now. 
    What did you do to fix the problem?

  • After Logic Board replacement Built in Display not working but External Monitor is

    Had to replace logic board in my Mid 2009 17' MBP as it wasn't powering up at all.
    Since putting in refurbished logic board MBP powers up and actually works perfectly with an external monitor but built in display is dead.
    In 'About My Mac' initially it showed Color LCD as being connected., but now it doent.
    Can anyone tell me if this is a problem of the refurbushed logic bioard from this ionfo - or if there is a w ay of being 100% sure that it is the logic board and not the display.
    Best
    Tommy Banana

    Shine a bright light at the screen and see if the picture is there, but the backlight is not there.
    Working inside MacBook is very fussy work, and it is far too easy to make connections that seem fine, but do not quite work, or to disturb earlier work during re-assembly. Just to vex you even more, the screen connections go through the hinge area, and are subject to constant movement and stress.
    I tend to first blame the last thing you changed (working inside your Mac in this case) as the source of the problem over random failure, until I can use classic techniques (such as substituting know-good parts) to rule random failures in or out.
    If you did not follow proper grounding and static-elimination techniques, you can cause major damage inside. Tiny shocks can ruin electronics long before you feel the spark.

  • C2D Display issues fixed with new Logic board. READ before this is deleted!

    While searching on Google for answers regarding logic board problems, I found an interesting MacFixIt article. Unfortunately I'm not sure how many of you read it because I could only access it now through Googles cache.
    From the article:
    We continue to report on an issue where their MacBook Pro Core 2 Duo (Late 2006) displays flicker or suffer from appearance of horizontal distortion lines. This issue is reminiscent of a problem that plagued some iBook G4s, generally resolved by logic board replacement.
    It now appears that Apple is replacing specific parts to remedy this issue, though a parts shortage problem may be causing delays. It also appears that this issue is not directly related to any defect in the display, as that is not the part being replaced in most cases. Instead, the logic board seems to be implicated.
    I hope this may be of some assistance to those of you suffering screen problems.
    As to this post being removed, well two of my threads regarding my logic board problems (core duo) were removed. Another thread regarding a possible delay in MBP C2D because of screen issues was removed yesterday. So read and reply quickly.
    MacBook Pro 15" 2GHz, 2GB, Week 28 (being fixed)   Mac OS X (10.4.8)   AMD Desktop 2.1GHz, 512MB, WinXP (SP1)

    can u explain me what is the MLB? is it the motherboard?
    because i have video issue, sometimes i can see horizontal distortion line like you can see at these links:
    http://img169.imageshack.us/img169/7888/dsc03013mx3.jpg
    http://img175.imageshack.us/img175/7905/dsc03014tf5.jpg
    http://img175.imageshack.us/img175/5957/dsc03015qk8.jpg
    btw, i clicked on your google cache link but the pix and video were deleted from the site....
    do you have any idea what kind of video issue i have?

  • Early 2009 24" iMac Haywire Display: LCD Panel or Logic Board?

    Hi,
    My 24" display just developed severe vertical and horzontal lines, mouse trailing, color changing and flickering.  The problem begins as soon as the computer is turned on (even the Apple screen goes nuts).
    When I plug in an external display, the external looks just fine.
    This is one of the Nvidia GeForce 9400 chipsets, so there is no separate videocard board to replace - it is integrated onto the logic board.
    It seems like it should be the display panel because the external monitor works fine, but these are complicated machines.
    This is an iMac 9,1 Early 2009, Core2 2.66 Mhz machine.
    Thank you,
    Josh

    Can you connect an external monitor and test? If the artifacts do not show on the external monitor, some component of the display is faulty but not the logic board. The dispay repair is not cheap but cheaper than replacing an LB
    If the same artifacts show on both, well... it's the logic board.
    AHT seldom picks up display faults.

Maybe you are looking for