Why Is iMac Screen Having Lines or iMac Screen Flickering?
iMac Screen Having Lines or iMac Screen Flickering Generally is caused by 3 Main Reasons – External Damage/Accidental Damage, Screen Faulty (could be due to a manufacturing defect), Display Data Cable Faulty. The effect of iMac Screen Damage differs across the built of the iMac – iMac With Intel Processor and iMac With Apple Silicon Processor
For iMac Manufactured With Apple Silicon Processor (2021 and later),
iMac Manufactured with Apple Silicon processor (iMac 24″ M1, M3, M4) are rumoured to have a thinner screen that produces better display – 4.5K Retina Display. When the iMac screen having lines, they are mainly due to the following reasons:-
1. External Damage/Accidental Damage
Applying force (accidentally) can cause the iMac screen to crack, which causes the LCD display to have defect, showing lines. Sometimes, accidental damage can cause the iMac to burn itself. It really hurts when contacted physically.
Here’s a video of us doing a screen replacement [On Instagram]
2. Screen Faulty
Constantly exposing the iMac to heat (be it heat generated by the iMac or environmental heat) can cause the iMac display to be faulty – be it iMac Screen flickering or iMac Screen Having Lines. Considering the fact that Apple Silicon iMacs comes with only 1 Mini fan at the bottom, while the screen produces heat, the logicboard as well produces heat. The body of the iMac is a thin aluminium material which conduct heat. The Apple Silicon iMac is housed to the heated Aluminium Body, which generates more heat to the screen. If the environment is warm, this will speed up the rate of screen faulty.
It is always recommended to keep the iMac in a air-conditioned room (if possible) while running heavy tasks so that the iMac does not overheat, and that prolongs the lifespan of the iMac Screen and iMac.
3. Display Data Cable (Screen Cable)
iMac Screen having lines or iMac Screen flickering? This is a common hardware flaw (design flaw) that affects iMac 24″ M1 and M3 models. This problem usually appears 2-3 years after purchase. It usually begins with thin horizontal lines at the bottom of the screen that gradually spread, followed by occasional flickering that worsens. What’s the root cause? A flex cable (FFC) that powers the LCD operates at high voltage and gradually overheats, worsening over time until failure. Reinstalling macOS will not solve the problem; it is a hardware issue. The remedy includes replacing the entire iMac Screen.
For iMac Manufactured With Intel Processor (2020 and before),
iMac Manufactured with Intel processor usually has proven to have a stronger screen. When the iMac screen has lines, they are mainly due to the following reasons:-
1. External Damage/Accidental Damage
Applying force (accidentally) can cause the iMac screen to crack, which causes the LCD display to have defect, showing lines.
2. Screen Faulty
Constantly exposing the iMac to heat (be it heat generated by the iMac or environmental heat) can cause the iMac display to be faulty – be it iMac Screen flickering or iMac Screen Having Lines. It is always recommended to keep the iMac in a air-conditioned room (if possible) while running heavy tasks so that the iMac does not overheat, and that prolongs the lifespan of the iMac Screen and iMac.
3. Display Data Cable (Screen Cable)
A Faulty iMac Screen Cable can cause the screen to have lines or flickering, maybe worse, the display is completely shut. The Display Data Cable plays an important role by transmitting digital signals from the logicboard and translate them into images to be displayed on the screen. Hence, a faulty cable can cause iMac screen to be faulty.
Why Choose Us?
KissMyMac™ is Certified Apple Independent Repair Provider (IRP) in Malaysia Nationwide. We have access to Apple Genuine Parts to perform iMac Genuine Repair by using Apple Tools and Systems to conduct the repair.
Frequently Asked Questions (FAQ)
iMac Screen Having Lines or iMac Screen Flickering Generally is caused by 3 Main Reasons – External Damage/Accidental Damage, Screen Faulty (could be due to a manufacturing defect), Display Data Cable Faulty. The effect of iMac Screen Damage differs across the built of the iMac.
Is it worth to replace iMac Screen is highly dependent on the importance of the iMac to you, and also looking at your budget.
If the iMac is your workhorse, and you need the data inside the iMac, it looks like replacing the screen and keep you going back to work is the most ideal situation.
Generally, replacing iMac screen will cost from RM900 to RM4000.
iMac Screen Replacement Costs are as follow (however, they differ case to case basis. So prices are for reference only)
iMac 21.5″
- iMac 21″ 2010-2011 : RM400- RM600
- iMac 21.5″ 2012-2015 (2K Display) : RM800 – RM1500
- iMac 21.5″ 2015 – 2020 (4K Display) : RM1500 – RM1900
iMac 27″
- iMac 27″ 2010 – 2011 : RM400- RM600
- iMac 27″ 2012-2015 (2K Display) : RM1200 – RM1900
- iMac 27″ 2015 – 2020 (5K Display) : RM1600 – RM2200
iMac 24″
- iMac 24″ (M1, M3, M4) [4.5K Retina Display) : RM2000 – RM3500
Yes, All iMac Repair parts used by KissMyMac are certified parts and all parts that goes out of KissMyMac’s door comes with warranty unless specified.
Yes, All iMac Repair parts used by KissMyMac are certified parts and all parts that goes out of KissMyMac’s door comes with warranty unless specified.
If iMac Screen is Having Vertical or Horizontal Lines, it depends on what is the root cause of the problem. It can be due to 2 reasons:-
1. The iMac Screen is cracked or physically or internally damage – Then the answer is YES, you have to replace the screen.
2. The iMac Screen is Faulty WITHOUT Damage. This is mainly a wear and tear issue which we can blame no one. It could be due to overheating that the heat is trapped inside the iMac which causes the screen to be faulty (as mentioned above).
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