How to fix "vertical lines" on my iMac 27 late 2009
Hi everybody, my name is george and i'm from germany.
i bought a faulty imac 27 2009 i7 with harddrive damage but the seller didnt told me there were these digital vertical stripes all over the whole screen.
so i waited a few weeks to buy another imac 27 2009 i5 with just another cpu and a faulty gpu which i repaired and now its working very well.
so i startet replacing the parts of the imacs to analyse the problem.
i ordered new lvds cable and v.sync cable. replaced them but nothing became better.
i replaced the lcd und nothing was better.
after that i replaced the power board next to the power supply and also i replaced the power supply. still nothing better than before. it cant be the gpu...
i didnt try to change dumb things like the odd, camera, ram or cpu.
maybe i should try that next.
i want to repair that device and i will. but maybe i need some help from someone else. after that we will definitely know what the cause for that apple fault is.
i think its the internal display port or damaged ic's in it or something else on the motherboard.
also very important, i tried the mini displayport to hdmi. perfect screen on my tv, no lines und no problems.
so what is it!!!???
now, a few hours later, graphics card replaced and still nothing.
pluggen everything thats not needed off, but still nothing.
so its definitely the motherboard and something is wrong with the internal display cable port.
but what is it!!!
2 hours later I soldered all the connection points from the lvds port to clear out that there are no dead solder points.
also its not the connector, maybe it is, so i would have to order a new port to solder it.
no one has the solution and i know i am not alone.
please help me to clear that problem.
Is dit een goede vraag?
Hi, me again. Now i bought another iMac 27 2009 with C2D and someone took the lcd out without unplugging the lvds cable, so the port was broken and i soledered a new one today in it. the same problem as the other iMac! Totally the same lines. Is there somebody who knows about the motherboards and what can cause this kind of error? I got good solder skills so i just need a good manual : ) thanks for your help!! aaand i reseted everything like p-ram or smc.
Did you every manage to figure out what exactly causes the issue?
I am at the same point you were at at the beginning of your replacing-every-part-quest, however i have not resorted to replacing anything yet.
I have faint digital noise lines showing evenly spread across the LCD. The V-sync cable is my first suspected culprit, however my parts-supplier claims it can only be fixed by replacing the LCD. Obviously , thats too expensive...
i have a feeling that the LCD is not the problem, but that it has something to do with a v-sync or backlight (inverter) board problem. maybe even the backlight board that is attached to the actual LCD itself.?
Pleaase, would be brilliant if you replied to this thread, eventhough it's over a year old!!
Any update on this? Experiencing the same issue.
door jonathan wishnev
I upgraded to the latest iPhone being a 6s plus recently probably be outdated in a couple of months
Anyways in order for me to be able to back this phone up to my computer I had to update the OS on my imac which is what I did and since then everything has just gone Kaput as has been the case from what has been mentioned previously above ,
I have no question about this issue being OS related so am not going to even bother trying to sort and just use my mac book pro which still works flawlessly as did my imac using Lion OS and wait until these OS geeks get the act together and get it hopefully wright next time with either another update or different OS all together ,
I'm certain apple intentionally does this in order to cause a panic and make people run for instant solutions or even upgrade there system or systems all together
Either way it's more revenue apples way
door Dennis Khan
@Dennis Khan - The trick to prove if the display or the GPU is bad is to plug in an external monitor. If the external display looks OK, the internal display is bad. If the external display looks bad then it's a GPU failure. We still have a few of these (EMC 2374) which we use as test stations both are running newer versions of OS-X Yosemite & El Capitan without any problems. Over the years many had GPU failures when we pushed them hard. Are you running some heavy graphics on your system like gaming? That will kill your system as the current near real life graphics is just to much for this old boy.
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