⟐ Answered August 10, 2026 at 14:57 MST

I have a OCLP-ed 2012 MacBook Pro with macOS 15.7.8, and it would struggle to connect to the internet, or outright refuse to connect to the internet. Would this be a case of a bad cable connection to the Airport card, or is something wrong with the firmware? Or is the age of the Mac finally getting to the Software? I would appreciate as much help as anyone out there can give out. To add on, I would have to restart the MacBook in order to make it connect to the internet.

Many thanks!

T

⟐ Answer accepted August 08, 2026 at 7:31 MST

I have MacBook Pro M4 A3112.(Nov'24). this is my first Macbook.

Initially display screen had some damage, so got the screen replaced and i notice both Wifi and Bluetooth has stopped working.

I took back to the repair guy who helped to replace the screen, but he has no clue why Wifi and Bluetooth are not working.

please find the attached the screenshots and photos I took as part of initial diagnosis I could do.

Please advise, what could be the issue and how to resolve this ?

Thanks

RB

Hi @danj

I did reformat whole Macbook and reinstalled OS. Seems issue still persists.

I connected the MacBook to my router using Rj45 cable with the help of connector so I can access wired network connection to internet.

However I tried to do offline diagnostic and I got the error CNW001 . Have attached screenshot.

Power charger wasn't connected to macbook when I ran the diagnostic so the error PPP020 can be ignored in the image here, as I see the MacBook is working fine when charger is connected.

Let me know what option i have to resolve this CNW001 error.

I am using wired connection for Internet for now, not a substantial solution.

Thanks

RB

I used an Ethernet cable and was able to connect to internet.

The pic was taken with ethernet cable on !

⟐ Commented August 06, 2026 at 20:15 MST

I’m dealing with a frustrating issue on my MacBook Pro M1 (2021) and could really use some advice. Here’s the problem:

• The issue: The backlight on my MacBook has gone dark multiple times now. When it happens, I can only see the display using a flashlight, so the screen isn’t entirely dead. Sometimes, after doing resets (SMC, NVRAM, etc.) or powering down and restarting, the backlight comes back on, and the MacBook works normally for a few days, but then the issue returns.

• Recent problem: This time, the issue worsened. When I power on the MacBook, it chimes as usual, and the Apple logo briefly appears on the screen before disappearing. After that, it keeps trying to boot but eventually lands on a black screen with an exclamation mark, asking me to restore the backup. The device no longer loads into the startup options even when I hold the power button for recovery mode. I’m seeing all of this using a flashlight because the backlight isn’t coming on at all.

• What I’ve tried: I attempted a DFU restore, but I got a “MacBook can’t be restored, error 2006”. I’ve also had a technician check it out, and he found a circuit shortage in the display and SSD section of the logic board, which he claims to have repaired. However, the backlight issue persists, and now it won’t boot past the exclamation mark screen.

Next steps:

The technician is now considering replacing the display to see if that resolves it. My main concern is whether it’s a display issue or if the problem lies elsewhere, possibly with the logic board or some other component. I’ve heard that issues with the backlight IC or power supply could also cause similar problems, but I’m not sure how to proceed.

My questions:

1. Has anyone experienced similar issues where the backlight randomly cuts out and comes back after resets?

2. Could this still be a logic board issue even though the technician didn’t find anything else wrong after repairing the circuit?

3. If replacing the display doesn’t fix the problem, what other components should be checked (backlight IC, cables, etc.)?

Any advice or suggestions would be greatly appreciated. I’m really hoping this isn’t a permanent issue, and I’d love to hear from anyone who has dealt with this before!

Thanks in advance!

⟐ Commented August 05, 2026 at 7:07 MST

I’m looking for some advice on a 15-inch MacBook Pro 2017 (A1707).

The MacBook suddenly stopped working and now shows absolutely no signs of life. I stripped it down and removed the logic board for inspection. I found what appears to be a burnt component(photos attached).

The marking on the damaged component appears to be:

C21 36 N7 G

Can this component be replaced on its own, or is it more likely that something else has caused it to fail?

Is it worth sending to a repair specialist / can I do it myself or is it dead.

There has been no known liquid damage, and the rest of the board looks visually clean.

I’d really like to save the laptop if it’s economically repairable, and ideally preserve the data that’s stored on the soldered SSD.

Any advice or experience would be greatly appreciated. Thanks!

⟐ Commented August 02, 2026 at 14:07 MST

Here see the horizontal lines in the Finder icon.

⟐ Commented August 02, 2026 at 7:17 MST

After realizing that MagSafe was not working, I tried my wife's iPhone's USB-C to USB-C and connected it to the MBP power brick. When doing that I saw the battery in red which indicates that the battery is fully drained. This had happened twice and connecting the USB-C from the iPhone helped charging the laptop for 10 minutes and then MagSafe worked perfectly - but this time it didn't work at all.

Tried out DFU "revive" with no luck as I tried connecting both laptops using the same iPhone USB-C cable and no power connected to any of them.

Need to know whether I get a USB-C 3.0 will help for me to start the process of DFU (as it didn't work with the iPhone cable).

Will this resolve my battery issue, should it be better to leave the laptop charging with the MagSafe or USB-C overnight?

⟐ Commented July 29, 2026 at 17:13 MST

I have a black screen on a macbook pro retina late 2013.

I already tried all the software fix like resetting NVRAM and SMC.

i’m trying to find a way to be sure it’s a harware failure from the screen.

The computer works fine since it’s booting and i can link it to a tv to see the desktop, so it’s not the graphic card either.

The computer got water spilled from the ceiling on the left side of the screen and it got all the way inside through the keyboard. The water quantity was very small, still the mac gave out instantly. Now it’s rebooting fine but without the screen.

I would like to find if the screen is done for good or if the connexion to the logic board is screwed. After opening the mac nothing seems to point that the logic board or the display cables have suffered.

I have a working screen from a mid-2012 macbook pro i could install for testing but i dont know if it’s compatible. On the Ifixit shop the two screens have 50 dollard of price difference, although it has the same spec, also i dont want to mess with my working macbook.

I know i could launch the apple diagnosis but it seems i cant make it display on another screen via HDMI.

Any ideas to rules out possibilities ?

Thanks for reading.

⟐ Answer edited July 29, 2026 at 5:34 MST

So if anyone can help a new diy repair guy out it would be much appreciated!

⟐ Commented July 29, 2026 at 2:49 MST

I got a 2017 13” MacBook Pro online for parts. The fans gradually ramp up and spin at full speed when plugged in. The trackpad connector was ripped off of the board and there is no ssd. Water damage indicators are also red, but no visual marks or stains. I get no image on the display, caps lock key does not light up when I press it. When unplugged, the system immediately shuts down. Any help?

⟐ Commented July 27, 2026 at 9:50 MST

Essentially, my Macbook Pro M1 16GB 2020 (A2338) camera has stopped working. Not sure why. If I open Photo Booth, the screen is black but there is no message/warning. The camera light does NOT switch on either.

Tried the following:

• Restarting
• sudo killall VDCAssistant and AppleCameraAssitant but it says No matching processes.
• Reset the laptop (factory reset using iTunes)
• Took off the bottom cover to confirm the 4 ribbon cables were still connected from the screen

If I go to my system information, then go to my camera, it says "No video capture devices were found".

Everything else works perfectly fine so not sure why it would be the camera hardware itself.

⟐ Commented July 26, 2026 at 10:38 MST

My display backlight was working perfectly just a day ago, but ever since I connected the display into another MacBook I was testing the backlight completely stopped functioning. I already swapped the small cable that connects the display board with the logic board and have also tried SMC/PRAM reset without luck. Connecting another display to the MacBook shows nothing either (this screen was untested however). Any help?

⟐ Answer accepted July 25, 2026 at 12:01 MST

⟐ Commented July 24, 2026 at 6:01 MST

Troubleshooting steps - I've basically done everything software wise, so I know it's hardware. Chat GPT seems to believe it's the backlight fuse that may have blown due to liquid entering.

Anyone have a hunch on what's happening? I know liquid is difficult, as I've actually worked at an Apple Store as a technician. This was a used purchase and I'd rather not spend a whole lot fixing it, but I'd like the backlight to work.

I do not have soldering equipment or a microscope, but I'm comfortable disassembling and stuff at home (I've replaced thousands of phone batteries and displays, and I build computers as a hobby). Thanks!

⟐ Commented July 24, 2026 at 4:04 MST

I’m looking for a board-level diagnosis for my MacBook Pro Retina 15” Mid 2015 (A1398).

Configuration

• Intel Core i7
• 16 GB RAM
• macOS Monterey 12.7.6

History

Before repair:

• The original internal display was cracked but still displayed an image.
• The Mac worked perfectly with an external HDMI monitor.

During repair:

• A technician installed a display from a MacBook Pro 2013.
• The replacement display never worked.
• He reinstalled my original cracked display.
• Since then, the internal display has been completely black.

Current behavior

If the internal display cable is disconnected:

• Apple logo appears on the external HDMI monitor.
• Startup Manager (Option key) works.
• Internet Recovery works.
• But when booting from Macintosh HD, Recovery, EFI Boot or a bootable USB, the Apple logo appears, then the screen goes completely black.

If the internal display cable is connected:

• The internal display remains completely black.

The Mac appears to continue running:

• keyboard backlight works,
• volume keys work,
• fans operate normally,
• but there is no video output.

Already tried

• NVRAM reset
• SMC reset
• Safe Mode
• Internet Recovery
• Bootable USB installer
• OpenCore Legacy Patcher

Always the same result:
Apple logo → black screen.

Verbose mode also showed messages including:

• device is not readable
• failed to initialize volume keybag

Questions

1. Could installing a 2013 Retina display on a 2015 A1398 have damaged the LCD connector or another logic board component?
2. Which is the most likely cause?
   • LCD connector
   • LCD power/backlight circuit
   • Display cable
   • GPU
   • SSD/APFS
   • Logic board
3. What measurements or board-level tests would you perform before replacing parts?

Any advice would be greatly appreciated. Thank you.

⟐ Commented July 23, 2026 at 13:03 MST

Also, is this cable bad?

Edit to add area after cleaning with IPA:

⟐ Commented July 22, 2026 at 19:50 MST

⟐ Answered July 21, 2026 at 18:32 MST

It turns on, fan spins, but that is it nothing else happens.The sleep light is on.

I have tried, removing RAM, Swapping RAM, Without the KB connected, Without a display, different HDD / SSD, Different working HDD cable, Reset SMC, PRAM etc..... Board looks clean, no water damage evident. Owner siad it just wouldn't start anymore. It does charge the battery though.

⟐ Commented July 21, 2026 at 15:42 MST

Observations:
macOS (all versions) detects and recognises the monitors, as in the screen flickers and recognises the brand and supported modes (within adapter limits)
Same goes to the pre-boot environment
Windows does not see the external display even after manual detection. Sometimes after reboot the integrated graphics in Windows is disabled due to a problem, re-enabling it brings back proper graphics but external monitor output is still not working or being detected.
All the adapters I've bought show the MacBook Air, not the MacBook Pro, although I've seen a review of someone using it on a 2012 Unibody MacBook Pro
A while back I had a different MacBook Pro model, still 2011 but the Early 2011 one, with the Core i5 instead of the Core i7. I was given a mini DisplayPort to VGA adapter and same symptoms, macOS and preboot environment sees it, but no display out. I was told by the person that gave the adapter to me that they use it on their 2015 MacBook Air just fine with no problems.

Is there like a common fault or difference with these Unibody MacBook Pros with how they handle that specific port and why it seems to be temperamental with cheap adapters? I haven't tried the adapters I've had since other than specific Lenovo ThinkPad laptops and MacBook Airs, I haven't had the opportunity to try them.

I want to try one of the more expensive adapters but I don't want to spend money on something that is not guaranteed to work.

Let me know if there's anything I could do.

⟐ Commented July 21, 2026 at 5:08 MST

⟐ Answer edited July 19, 2026 at 15:47 MST