Macbook 820-2936 logic board dead; diagnosis and repair of U7000 circuit.
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- čas přidán 29. 08. 2024
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Thank you Mr. Rossmann for sacrificing your precious time to teach us, I learnt a lot from you and I appreciate what you are doing.
The best tip in this video is pushing down on the ISL hard. Thanks Louis!
Mr. Rossmann, thanks for todays lesson, you prove a good point on using our brains to solve shxt that isn't difficult to solve. What I always enjoy about your lessons is the summary at the end, we have to look for the simple things that created a problem, instead of jumping right into a bigger problem that could've been solved in short time. How you educate us through your channel makes me understand logic boards and schematics more easily. 👍👊
I´ve learned so much over the past few weeks watching your channel. You definitely need a donate button :D
+m2k We have on front youtube page it gets used once a month or two. I have gear auctions for my old crap every now and then as well.
Just did a blown u7000 with pin 3 shorting to ground. Again we wouldn't even know what any of this was without your help. Thank you again Louis.
+C.J. Edwards Glad this helped you!
Hope you had a good new year, nice to see a new video.
C7011 connects the center of the resistor divider to ground, it could have been this capacitor. But why didn't you suspect this capacitor before judging on the chip ? These kinds of capacitors also fail short.
Great video as usual!
Corrosion between the large caps at 6:28 :) water damage the owner tried to clean up.
THANK YOU SO MUCH
Hi Louis. I really like your videos and I wish that one day I will gather enough knowledge and skills to diagnose and repair like you! Right now, electronics repair is just a hobby for me. (I'm 13 by the way )
+Dawid Ziaja
Awesome! I'm in my late teens and I'm the same way.
Fixed our big plasma TV a number of years ago ... it's still running to this day!
I've already designed and built some circuitboards ... it doesn't take a college degree to accomplish a lot in life!
Go for it!
Hi Mr Rossman, thanks for the tutorial. I am following this tutorial and I have a similar problem. Where can I buy the U7000 chip, I am based in South Africa.
I have this problem with a board 820-2936-B:
- green light on charger oK
- fan spins ok, but then a full speed
- no chime, no long beep even if no memory
- nothing on display, not backlight.
Measures:
ALL_SYS_PWRGD=3.32V
PPBUS_G3H=12.6V
PP3V42_G3H=3.48V
PP3V3_S5=3.33V
PP5V_S3=5.1V
PP5V_S0=5.1V
DPBUS_S5_HS_COMPUTING_ISNS=12.6V
PPVCORE_S0_CPU=1.12V
PPVCORE_S0_AXG=0V
PPVRTC_G3_OUT=3.33V
PP5V_S5=5.1V
PP5V_SUS=5.1V
PP3V3_SUS=3.33V
PP3V3_S3=3.3V
PP3V3_S0=3.3V
PP1V8_S0=1.8V
PP1V5_S3_DDR=1.51V
PP1V5_S3RS0=1.51V
PP1V5_S0=1.51V
PPVTTDDR_S3=0.75V
PP0V75_S0_DDRVTT=0.75V
PPVCCSA_S0-CPU=0.9V
PP1V05_SUS=1.04V
PP1V05_S0=1.05V
PP3V3_ENET=3.29V
PPVP_FW=12.75V
PP3V3_FW_FWPHY=3.31V
PP1V0_FW_FWPHY=0.99V
PP1V05_S0_PCH_VCCADPLL=1.06V
PP1V5_S3_CPU_VCCDQ=1.51V
PP1V05_S0_CPU_VCCPQE=1.06V
PP1V8_S0_CPU_VCCPLL_R=1.8v
All these voltages seem ok, except for PPVCORE_S0_AXG=0V, but for what I see, it doesn't appears until videos is displayed
You are awesome dude, make more videos !
Good friend I have a Macbook pro 17 "does not load ... the u7000 had exploded but a clue is not there and I can not find the schematic, can you help me?
A great chinese company for soldering equipment is Aoyue I had them for 20 years only needed to replace heating elements every 5 years. Stay away from their ultrasonic cleaner though elma and crest are great tools.
Thank you, que lastima que no esté traducido to spanish, very good
I happened to see one of your videos while browsing. Out of curiosity, do these videos have a positive or negative impact on your business in general? Discussing detailed debugging and repair videos (which I assume is being done on your customer's PCs), does that create more competition?
+The Signal Path Blog It's funny you're here, there is some flamewar troll thread in another video where someone has 30 comments on how I am an idiot in contrast to "real" engineers on CZcams, and they cited you as one of them. I checked out your series, absolutely love what you were doing with FPGAs as a "graphics card" to drive LED displays. That blew my mind! Amazing stuff. Great channel!
In terms of competition, I am on an island of 2 or 8 million people so I don't care. If I get even 0.00001% of the customers that there are to service, I will be up to my eyeballs in work for a lifetime. My local business has gone down because of the eventual competition from everyone who would have opened anyway, regardless of me doing videos, but mail-in business did go up as a result.
I don't feel like this information is what will make someone compete. I watched your entire video and I have no idea how to make a graphics card out of an FPGA. If I were truly motivated to do that, I would do that.. whether or not I watched your video. Since I am not motivated to do that, I won't have a clue how to, even though I watched the entirety of your video. Does this make sense?
+Louis Rossmann Sorry to hear about the other thread. I have not seen it.
Thanks for the kind comments. I have a lot of repair videos as well, they all involve test equipment. The Signal Path is a non for profit site, it is a hobby of mine to give back to the community. I have a Ph.D. and I work at Bell Labs doing ASIC design as my main job.
Thanks for the information about the business. I understand the point you are trying to make. I hope you get more than 0.00001% of the customers though, that would be less than 1 person even if every person in NYC needed a repair! ;)
The Signal Path Blog Wow. Most anything good that has come out in the past 80 years has come from Bell Labs. Nice job! I failed out of college three times and had to cheat through chemistry regents to get out of high school.... I'm surprised YT even lets me upload videos. :)
+The Signal Path Blog I haven't subscribed to your channel but it sounds good. I'll subscribe and have a look, but I'm still trying to get through more of Dave Jones EEVBLOG videos, I'm watching them in order, skipping the ones I've already watched.
+Louis Rossmann the increase mail ins obviously outweighs the loss in walk in customers, and you would also get the ones those local repairers can not fix.
I also thought the cap on the 4v side of the divider could be shorted, obviously not the case in this repair? wouldn't this have the same effect of 0v at U7000?
Was it the cleaning of the MB or the keyboard fitting that caused U7000 to fail. I know you don't really care about the cause in the long run, it's fixed.
Was it the correct KB or some ebay cheapy ?
oohh ps: that U7000 was on too straight, you're loosing your touch :D
TOP
im trying to remove the same chip right now, but its really stuck on, I wonder what temperature are u using and air flow?
Hi i enjoy the videos and learn a lot of repair macbook, i'm technician but never repair one, until a client brought me one macbook no green light in the magsafe, but i found the schematics and will not give up yet, question, the microscope you use, i tried found something like that for me, i repair cellphones, and need a good microscope, which brand and model it is yours? thanks
i brought my macbook A1278 820-2936B to repair shop, and they didn't do it well, and after i check my board, i found that u7740 is missing, and i check it in schematic, the schematic tells that it should be on board, does anyone can help me ? does it really on board or not ? thanks so much
Did you give the Weller hot air station back?
+dogastus This was recorded back before I owned the Weller WHA900. I record videos and set them to upload in four day segments. I have a LOT of videos in the queue at any given time...
i appreciate the work you do, But I can get this board new for 329 with shipping. Less than the $350 you charge to fix it. Youre still the man but why do people bother to fix a 5 year old board nowadays
+mastahc411 No fucking clue! I tell any customer who asks me what I think to spend the extra $400 to get a refurbished Macbook Air from Apple.com's refurb store and toss this shit... it'll feel 10x faster because of PCIE SSD, battery life kicks this thing's ass, screen kicks this thing's ass, it's lighter. The funny part about salesmanship is that the more you tell someone not to do something the more it makes them want to do it. :( I can't imagine using a sandy bridge processor in 2016, dealing with a fan that spins at high RPMs just playing 1080p CZcams...
In terms of the pricing, even on this five year old POS, the average consumer has two scenarios.
Scenario A: self service, $329
1) Disassemble their laptop.
2) Find the right part number.
3) Hope the number they found is the right one.
4) Find a vendor.
5) Hope the vendor doesn't sell them a piece of shit pulled from a dead machine by a brainless hack at some escrap company.
6) Wait a week for it to arrive.
7) Install it, hoping during install they don't fuck it up.
Scenario B: store service, $325
1) Give me the laptop in one piece.
2) Get phone call one day later that laptop works perfectly.
3) Pick up laptop in one piece, done.
Mine is slightly better on price, but absolutely kicks ass on convenience. How many people are going to buy a board based on model number "A1278" and get the wrong one, or buy a board that is dead from some escrap jackass, or plug a liquid damaged cable into it and "poof", or rip some cable. None of this is rocket science, but everything is easy the SECOND time you do it... it's not fucking up on that first time that is priceless. :)
Now for other REPAIR shops my model makes no sense, but I can't say I care about them anyway. I have repair stores often dangling business in front of me, like a carrot to a starving rabbit, as if I should do it for $50 just because. Why bother... ?? the new jobs slots are filled with paying work from regular consumers who are happy, this method lets me make money and saves a board that would otherwise get tossed in the garbage, and is much more convenient and valuable to the end consumer. Score 1 for planet, score 2 for me, score 3 for customer. :)
In terms of long term viability, you can see what I think about that here. czcams.com/video/AunzSPGlnpI/video.html Absolutely no way in hell do I suggest this will be a viable business model five to ten years from now, you always have to move on and work on new stuff.
+Louis Rossmann I can completely relate. in just had a customer that spent $400 to have a HP g60 with a celeron have a screen and hard drive replaced and an os reload despite us trying convince him to buy another machine
mastahc411
Wow. I have been bested by your REVERSE salesmanship :) :D :p
i29.photobucket.com/albums/c294/luke9511/2015-06-20%2018.51.59.jpg this is a logic board for a 27inch 2011 apple imac, cpu was fine but was curious if this is fixable? or is the whole board dead? also awesome videos will be watching more of them!
First
wow you're cute!!!
... O.o