iMac motherboard repair - No display No backlight
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- čas přidán 2. 08. 2024
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Hi Alex. I am repair technician from kenya and you have inspired me on my repair alot.
I didn't know you have electrictity there ... just kidding :D
@@andreydoichinov1683 Hey that is not a very funny joke bud. Mind your words next time.
@@andreydoichinov1683 Hey that is not a very funny joke bud. Mind your words next time
You think we are poor?
@@johnmutiga2046 It was a joke. And it is still funny to me :D. No just the location of your country makes me feel like that there are only lions there. But I in my job I work with Kenya and I know that you are not all poor.
Thx for your time and efforts you make in all your videos. It really helps all the viewers and sharpen the technicians brains. Keep up the good brother and may the creator bless you more.
I've got $2.00 that says that scorched Filter is actually bad. That burn did not come from no where. (I have a decent understanding of what you are doing with a Meter, I graduated from Coleman College with a Cert. for Computer and Electronic repair, but that was many Moons ago and with not finding a Job in that Industry I followed the Family Practice in Auto Repair.) I have used those skills to excel in Automotive Electrical Diagnostics. Yesterday, (just by chance) had a 2015 Ford Escape towed in for No Start after Vehicle was warm. When Vehicle acted up, Key on, all Dash Lights came on and performed Bulb check like normal. I noticed that after depressing the Brake Pedal to start, they all started to Flicker and totally shut off when you tried to Crank the Engine over. One of the 50 amp Midi Fuses in the High Current Battery Junction Box was not Blown but most likely had a non visible Hair Line crack. Using a Meter, it tested absolutely good. If i would have gone off of Meter readings, I would still be trying to figure it out. (Not sure how you could do it except for testing with power on and loading a circuit while live). It is Called Voltage Drop. A basic Incandescent Test light is a low amperage test. Sometimes I use Headlight Bulbs as a higher Loaded test to find faults in Circuits. In this case, Basic Test light was Bright with Key off. It dimmed a bit with Key On and go completely out when hitting the Brake Pedal or trying to Start. Back to Key off, use a High Beam Headlight bulb as the test, get a spark on initial Probe touch but Bulb would not Light up. Long Story short, Meter's can be miss leading a lot of the time. This 50 amp Fuse was only capable of passing roughly 8 amps of current until it would go Open without actually being Blown.
Mindblowing how Big Boss is able to keep track of all tiny screws and parts while he‘s assembling and disassembling so much stuff each day. I lose track already while having two devices 🤯 maybe you can show us his secret techniques?
It is easy have a container like an ice box, whenever you remove screws put them in cell then put the next in next cell
Now when assembling goin in reverse, the last cell got device current screws
The idea ; have some aiding tools and processes
I love these videos. I need to post more of my solder work with customers! You're great at editing all of these on top of your master skill at fixing!!
Alex! You rock!! Better than factory? Beyond factory! Bless you, your family and all those you selflessly share your knowledge with...
Excelent way to star a new day! thanks for your vids Alex.
I have the same issue on my 2012 MBP 15", got chime but no display. It has been sitting on my shelf ever since. I asked the local "fruit" tech and they couldn't figured out anything, recommend me to buy new motherboard which costs almost the same as it is. I hope you will find the problem (which always will), and I'll follow your steps, oh great Guru and the good Big Boss.
Try this czcams.com/video/PqgHOa7lVls/video.html I fixed a lot of 2012 15” MBP with chime/no display by resoldering u8900
If its the retina model. It is most likely the soldering around the Maxim GMUX chip. If it is this chip, you will not have any display even if you shine a torch at it.
"I'm going to put these right here and run."
lol classic
Excellent content as always, thanks for the continuous uploads and the hardworking of you and your family I've learned so much.
Near 6407 you saw a burning mark i think you must change that component.. 👍
Emeğiniz ve videolarınız için çok teşekkürler
Thanks, think this one is a fix, not sure how. More exploration needed. Appreciate your content, thanks.
Love to watch ur video, excited for part -2
Maybe there is a burn trace under the inductor with a burn mark. If inductor is ok, this burn mark had to be come from something. You can also measure the backlight voltage, although I do not thing it is a problem
Here's hoping you make another video on this particular repair, I would like to see what the problem with it is, because I was also expecting it to work after you found the blown fuse.
Very great and interesting video. Maybe you should change that resistor opposite the fuse you have changed because of the burn mark. This burn mark have to be from that component cause there is no other one nearby. I hope you can fix it and do a second part of this problem. Thank you for the video. Greets
great content as usual alex
Good job mate.
That burn mark seems indicative of the magic smoke escaping, I'd certainly give that some attention before anything else.
Keep up the good work brother 🙏
That burnt component tho - maybe when its getting power its failing - even though its testing ok. I would swap that out as you have a donor board to hand.
i agree... and it looks like an inductor... so maybe its inductance is messed up although it still measures as a short but it isnt acting as a coil correctly
thanks for ur videos sir, they are more like a tuto repair videos
they inspire me alot
Good luck Alex
Thanx 4 sharin'
Very good informative Videos.👍 from India.
Probably the next video gonan be changing that mosfet. I think you will make it my friend. Thank you like always. cheers
Wow! great Sir for isolation. Im waching here in philippines. Sir asking for you what model your microscope what brand Sir. Thank you very much.
How are the fans, fins? Is it overheating? is the heat sink paste good or powdery?
Very nice sir✌
At 1:49, is that component(filter) a capacitor or an inductor? Thanks in advance.
hi big boss gd day sir, love ur work and everything u do sir.
Thx for your
Is it a decent idea to first measure the cap from donor board as you will know value for future repairs? No need to desolder and test value in future.
Sir, I have a 2017 imac 27” 5k retina. I have removed the core 5 chip and will install a core 7 shortly. Looking at the board where the chip will be replaced, I saw several small black spots. I put the board under my microscope snd saw 2 small spots where the small pins with a spring attached to a gold head that comes into contact with the core chip after you reinstall it, 3-5 springs were bent that looked like they would not come into contact with the new chip. I managed to take my tweezers and gently bend the springs back to match all of the others beside them-except one. 1 broke off at the base so i will have 1 pin not making contact when I reinstall the core 7 back. Will this one missing pin cause a problem? There are so many of them! Thank you.
Good for you bro
mantap kawan sangat membangun,buat kita sama teknisi terima kasih
Alex is my dear brother Love your "what can you do". And you die for "better than the factory" and even consider doing something about these sentences, details below, it's confidential hahahaha As for the Mac, it's clear that it's going up, and it's only a problem with everything related to the image. Since you hear the ios login sound It's pretty clear that it's something like that without seeing the following video related to the same device I will watch the next one, and see if I was right.. Anyway, love you! you are my hero !!
Awesome ✌🏻✌🏻✌🏻
Nice Vedio ☮️👍
but sometimes boats do not like to sail in the direction of the wind...may be board issue?lvds cable?ram did not installed properly?lcd panel?🤔
Hi from kurnool Andhra Pradesh India 👍
I was using my imac when the fan noise was so loud and I figured I should clean it all and reapply thermal paste. It won't turn on anymore, only 1st led is on. What happened? I've heard very similar cases around the net on these type of vids
Hi, very good job.
I have a problem on backlight screen but after 30 minutes the backlight gonna be working. That's so weird. When I restart the iMac the backlight has working but if I shutdown and restart, the backlight has been no working again.
I open my iMac and nothing looks burning or other problems. I make all your test like on video.
So my question is: did you have any idea what's wrong?
Thanks for your feedback
Hello Alex. Can you tell me how to remove a melted/ overheated efi/bios chip from a 2019 IMac 27 inch?
I see you have an ESR meter on your desk. Can you please demonstrate how you use it in the context of a repair?
Does it power an external monitor?
What if we try an external monitor, would it give an idea for a solution
Super bien
»How do I use a multimeter?«🤪🤪🤣🤣 couldn't stop laughing! A useful habit of mine is: soon I keep ⁄⁄ salvage things, I label them by using a Tape and write down the current⁄⁄last Condition of that part. If some years late, that specific part comes in question, there is no more search necessary. Just reading the left notice on that Tape will do the job greatly …
I still wonder if there is more to that burn mark on the PCB and if that could be the smoking gun.
Oh yeah, new follower
Were you ever able to fix this iMac? I had a 2019 where I replaced the HDD with an SSD and after reconnecting the screen, I got no video. LED5 would never light up. As always, your videos are very informative.
My iMac Intel 27" not turning on, there is only the first led, is there any way?
Hi, I have the same problem, the iMac 21.5 Late 2013 14.1 starts normally but you can see very little of the image of the apple when it is starting
Now, I did tests with another iMac 21.5 Late 2112 and I get the same problem, the screen is dark, it is impossible for me to believe that something on the Board has been damaged in both iMac
what do you think it could be?
for XM1903 I use a magnetic bowl for screws
Hi Alex,
That second burnt mark might be your clue to as why no video. The fuse you replaced was only for the backlight. Perhaps there is another fuse for the video component. Hope you fix it. Thx
Why did the fuse blow?
These repair videos are priceless, it's the future. The "throw away" mentality needs to stop. Right now Europe is going through an unprecedented heat wave, climate change is real.
Once you took the mobo out again because you forgot the RAM I didn't hear the chime on each subsequent attempt to boot.
Scientist here : The fuse may be blown again. Something else may have caused it to blow.
Will you have hot pliers on the site to buy that would make taking of smds so much faster then way I have been doing it.
search for : Soldering Iron Tweezer
smt soldering wattage is 20 ~ 25 watt
if more it will fry the traces if not handled properly
Came in for repair.
Damn! I'm curious nów how the repair has ended
When I wanted to get info on how to do something before the internet, I would go to the book store and look for how to fix books.
Or, I'd go to where a repair shop was and try and get the tech to show me how they do things. Now, all you have to do is own a computer and google what you want to do or repair.
There are tutorials everywhere in the internet.
For someone to just ask such a blanket question without doing any research is just LAZY!!!
I find that modern people don't even want to put forth the effort in going through a learning experience. I agree with you on just how dumb some questions can be.
If it were me answering I'd copy a YT tutorial link and send it.
😎👍
Good morning
Why Mac doesn't have mark on board?
👍
am asking for multimeter displayed on screen humbly, as always nice video👍
Buy the software and donate it to him.
@@michaelbox7285 put the link which software I buy
Create a noob section for questions like the multimeter then. Wasn't the forum for people to learn? Like you always say, you gotta start somewhere.
Ps, i know the multimeter guy and he watches your vids every day! 😜
How to use Multimeter or equipment questions can go under Tools and Equipment section of the Forum.
Keep up the explicit work! You really deserve every viewer. 👌 I cannot understand how you can sleep that little and still function.
The display connector will be the problem, I also had with the model
❤️❤️👍😘
i'm sorry, am a noob, but how can you know the measurement of a capacitor when there is no writing on it ? is it just by its size, does anybody know ? how to...
Hi, I've been following your channel for over a year.
I have an awful lot of thoughts and I don't know how to write them. I live in GERMANY and repairing is my favorite hobby, which I have been doing for about 30 years.
have you ever thought about starting a business under your brand and selling online in EUROPE?
Hello Sir, I have questions regarding my imac late 2013, I have replaced the logic board (AS-IS ¡Mac 27" A1419 Late 2013
Logic Board NVIDIA GTX 780M with 4 GB *NO CPU*) Previous was 2gb of Graphic card so it doesn’t work, no sound nothing showing in display, please help me with this issue
I think maybe gpu not supporting 2k display or cpu
but new Logic-board the same as previous Logic-board
Need second part for this video
I have the same problem with a 2021 I pad it turns on and chimes etc I get backlight but no picture
Just a thought if there is backlight maybe focus on signal. Hope you have a successful repair!
@@tripsix2186 it's my friends dads he opened it and had a go at replacing his broken touch glass but now no picture he has probably damaged a filter when he removed the connectors I'm amazed it still has backlight though
Ohh jeez! Upgrading the ram requires all that disassembly?
How about Trying without SSD
Wow, that cap really let it all go.
👋
⭐♥️👍👍👍👍👍
So fuses on an Apple board can actually blow, instead of connectors and mosfets.
yes, so from this we may have some avenue of troubleshooting. Generally apple fuses don't blow so if they do maybe they point to something repairable.
Well, fuses are an additinal layer of safety, so that if a component fails, and there's no ocp, it doesn't catch on fire. And although sometimes, replacing a fuse can fix the issue, you have to ask yourself why it blew in the first place. Similar story goes for low value resistors, he has a video of replacing a blown 10ohm resistor, which blew up as soon as the board was powered on again.
Good explanation Lakiza, thanx
They did not see it coming 😅 true story
If I was doing that I would have to put a sticker on each item what components I used and what went bad , all the barium , aluminum the government spraying in the air it is difficult to remember things these days. Thanks for sharing
Use a external monitor to test the iMac
if none of the lcds work try reflowing the graphics card that might help.
its more work but should fix a black screen issue
The right-hand cap on the donor board looks to have manufacturing defects, it is no surprise that these fail. Tut, tut Apple.
ledy do wymiany mistrzu. imac 27 ma to samo . matryca do demontazu i paski ledowe do zmiany. troche zabawy. dioda sie wypalila na pasku ledowym
Psychic's shop closed, they never saw it coming ...
Black screen. Also, connectors. 😐 (May have spilled entire cup of coco in case.)
Did you find the ultimate problem/solution to this screen?
ركب الرامات وحدة وحدة يمكن فيهم وحده عطلانة
I think rams rarely fail on Macs because they use regular ram unlike PC/IBM clone which use speedy ram
Actually BIOS firmware could be suspected
It might need a reflash if not ok
oh,another Mac PITA!
It is gonna get fixed, just needs more time
1:53 that component smells sketchy
Say ماشاالله to big boss
its really tedious to disassemble an imac
long gone are the days when you could open a case and change in seconds a power supply,a hard drive,ram bank,video card and so on,...what did we do wrong?
it looks cool though, gotta admit that...
We want them thinner, smaller, lighter, cheaper.
How do I build an airplane. 😂
Why is there no Arabic language?
He is in California, America; the audience mostly English speaking with Latin(Spanish/Mexican) speaking minority