For the p-channel MOSFET, the voltage on the gate has to be lower than the source for the transistor to CLOSE [in the video around 11:40 the term used was OPEN]. OPEN was used several times thereafter, but this is the opposite of conventional definitions. In terms of switching, open means high-impedance, and closed means low-impedance. Perhaps say "allow these transistors to conduct" rather than "allow these transistors to open".
Awesome videos! about those pins not connected to ground in the schematic I believe that would have trown an error when comparing the board layout and connections to the schematic, I believe that was left out in purpose, maybe?
Engineer here. Don't know why someone would be a pedant about calling a MOSFET a transistor, seeing as the T in MOSFET literally means transistor. For the purpose of computing, the terms are (for the most part) completely interchangeable, because computing doesn't typically use transistors like BJTs and shit.
About the shitty schematics and missing ground connections: I don't remember ever that they were shown like that, so I just opened my 820-2330 schematics and sure they are all drawn correctly with no missing links. I used Adobe's Reader. Almost certainly your PDF software has some trouble rendering vector lines, I would guess :))
Thanks Louis, Was looking for this one. Everything is fine, just one thought. I removed Q6915 and U6915, still not a green light. Lost 18V on Q6910 pin 6 (was there before) Then back to schematics and realized Q6915 dual MOSFET in one case. On schematics it is two things in real live I removed one from onewire overvolt circuit and SMS BC ACOC RC is also gone and locked Q6910, no more 18 volt on pin 6. Is it safe to short Q6915 pin 6 to ground just to check if everything is working? Best Regards,
Thanks alot for this video, it was worth waiting for! Is it correct that if I don´t have CHRG_ACOK (SMC_BC_OK) onewire will not work and there is no green light on charger? Should I replace u7000 first?
Having some issues sorting out the One-Wire. Sometimes when I plug in the board I GET a green light, but most of the time I DO NOT get a green light. I have watched several videos from Louis and am still stumped. Here are some of my readings. U7000 CHGR_ACIN - 4.0V CHGR_DCIN - 16.7V CHGR_ACOK - 3.34V U6901 SMC_BC_ACOK_VCC - 3.48V PP3V42_G3H - 3.4V SMC_BC_ACOK - 3.34V (Both Pin 1 and 2) U6900 SMC_BC_ACOK_VCC 3.48V SYS_ONWIRE - 3.46V ADAPTER_SENSE - 3.46V Are both pin 4 and 5 of U6900 supposed to be the same? (didn't think about, till just now, taking the cover off my working MBP) What am I overlooking? The board does have liquid damage around U6901 and the SMC, I did change U6901. U7000 and U6900 appear not to have been touched by liquid. Thanks for any assistance, this is driving me nuts. I do not understand why I have a green light some of the times. I am also using a known working OEM adapter from my other working MBP.
Hi Louis. Love the vidz and all you do. Question. I have a MacBook Pro 15-inch, late 2008 with a 2.4 Intel Core 2 Duo, 6gb DDR3, 700GB HD, NVIDIA GeForce 9400M 256 MB running OS X 10.8.5 (12F2560). This thing still runs and looks AMAZING. I have taken care of this unit with kid gloves ... BUT ... Would love to update the OS to run 64 bit Apps. What do you suggest.
Hi Louis, I love your videos, I always learn something ! :-) I have an 820-2330 I'm trying to repair, the previous owner try to reflow it in an oven .. anyway, no liquid damage PP3V42_G3H is 3.3V SMC_BC_ACOK is 3.3V ADAPTER_SENSE sense is 0V So ONEWIRE_OVERVOLT is 9.47V and QQ6915 is active and send ONEWIRE_EN to ground. (0V) I've tried another know good DC-IN board with the same symptom, I don't understand why I got no ADAPTER_SENSE, charger is working fine too. R6920 is 24K and OK. There is no short to ground on adapter sense Could someone help please ? Thanks :-)
Are you sure that these schematics are so badly drawn by Apple? I have never seen a schematic with a loop in a wire (unless it is supposed to represent some antenna or board inductor, but it will have a long description next to it). I'd guess something went wrong on the way from Apple to your PC. I guess Apple does not put a URL of laptop schematics in the background either...
Louis i'm a highly qualified It man i did my degree in Graphic Design and Multimedia in England did my Cisco studying as well but really i'm not into this stuff any more i hate being on a laptop 24 hours designing... i have a very good experience in repairing laptops but not to a component level i will i will be able to troubleshoot laptops using schematics sometimes i think i wasted my life studying IT the pace that this technology is moving is frightening and we should keep updating our skills otherwise you are fu@@@ up
lm397s can be replaced with a lot of other opamps and the fet can be replaced with a huge number of things often on old motherboards i cross reference parts when the customer is a real bitch and willing to pay to have it fast also the disconnected lines are there but the person who stole the schematics from apple and then exported them to pdf screwed up the rotation of those wires it's a common problem with converting schematics to pdf
It's pretty easy to hate on Apple, but just because you downloaded a crappy schematic from a random web site that is missing symbols isn't a valid reason. You can't make a pcb with that many things missing, it just doesn't happen. That pdf was just plain mangled somewhere along the way, be it on purpose or accident.
+Reed Arnold If you look carefully in the last schematic and compare it with the good one, it seems like a bunch of the lines and labels were simply moved. Somebody probably fucked it up along the way, I seriously doubt Apple would produce such garbage.
+SWEDEN YES Incorporated there is a giant watermark in the background to some obscure site. no need to really compare to anything as it's not authentic once anyone has done something like that.
"you're not going to allow the customer's balls to explode if they plug in a knockoff charger" ... priceless, Louis. Just priceless. :)
Great cast.
Thanks for uploading.
For the p-channel MOSFET, the voltage on the gate has to be lower than the source for the transistor to CLOSE [in the video around 11:40 the term used was OPEN]. OPEN was used several times thereafter, but this is the opposite of conventional definitions. In terms of switching, open means high-impedance, and closed means low-impedance. Perhaps say "allow these transistors to conduct" rather than "allow these transistors to open".
+lmiddleman it's a bad habit of mine. i say open as in let power through, but that is not correct terminology.. just a bad habit.
I want that chair!
Awesome videos! about those pins not connected to ground in the schematic I believe that would have trown an error when comparing the board layout and connections to the schematic, I believe that was left out in purpose, maybe?
Engineer here. Don't know why someone would be a pedant about calling a MOSFET a transistor, seeing as the T in MOSFET literally means transistor. For the purpose of computing, the terms are (for the most part) completely interchangeable, because computing doesn't typically use transistors like BJTs and shit.
About the shitty schematics and missing ground connections: I don't remember ever that they were shown like that, so I just opened my 820-2330 schematics and sure they are all drawn correctly with no missing links. I used Adobe's Reader. Almost certainly your PDF software has some trouble rendering vector lines, I would guess :))
Have you tried opening these schematics with a different PDF viewer?
Thanks Louis, Was looking for this one. Everything is fine, just one thought. I removed Q6915 and U6915, still not a green light. Lost 18V on Q6910 pin 6 (was there before) Then back to schematics and realized Q6915 dual MOSFET in one case. On schematics it is two things in real live I removed one from onewire overvolt circuit and SMS BC ACOC RC is also gone and locked Q6910, no more 18 volt on pin 6. Is it safe to short Q6915 pin 6 to ground just to check if everything is working?
Best Regards,
Thanks alot for this video, it was worth waiting for!
Is it correct that if I don´t have CHRG_ACOK (SMC_BC_OK) onewire will not work and there is no green light on charger? Should I replace u7000 first?
Having some issues sorting out the One-Wire. Sometimes when I plug in the board I GET a green light, but most of the time I DO NOT get a green light.
I have watched several videos from Louis and am still stumped. Here are some of my readings.
U7000
CHGR_ACIN - 4.0V
CHGR_DCIN - 16.7V
CHGR_ACOK - 3.34V
U6901
SMC_BC_ACOK_VCC - 3.48V
PP3V42_G3H - 3.4V
SMC_BC_ACOK - 3.34V (Both Pin 1 and 2)
U6900
SMC_BC_ACOK_VCC 3.48V
SYS_ONWIRE - 3.46V
ADAPTER_SENSE - 3.46V
Are both pin 4 and 5 of U6900 supposed to be the same? (didn't think about, till just now, taking the cover off my working MBP)
What am I overlooking? The board does have liquid damage around U6901 and the SMC, I did change U6901. U7000 and U6900 appear not to have been touched by liquid.
Thanks for any assistance, this is driving me nuts. I do not understand why I have a green light some of the times. I am also using a known working OEM adapter from my other working MBP.
First! :-) Great job man, keep up the great work!
Why is there two Q6920? Wouldn't one work just fine?
Hi Louis. Love the vidz and all you do. Question. I have a MacBook Pro 15-inch, late 2008 with a 2.4 Intel Core 2 Duo, 6gb DDR3, 700GB HD, NVIDIA GeForce 9400M 256 MB running OS X 10.8.5 (12F2560). This thing still runs and looks AMAZING. I have taken care of this unit with kid gloves ... BUT ... Would love to update the OS to run 64 bit Apps. What do you suggest.
Are you using OpenBroadcaster Studio, or the "Classic" version? Apparently this was fixed in the Studio/Multiplatform version.
+Mark Furneaux studio multiplatform.
+Louis Rossmann Lower it down to 30fps, your machine can't handle 60fps.
Hot Seeding it handles 60 FPS on 4:2:2 video capture, but can't handle 60 FPS on static content?
Louis Rossmann Keep in mind you also have your webcam running and that source is sure not at 60fps, but most likely 20fps.
Louis Rossmann The point is, you're not providing genuine 60fps content, so use 30fps at the maximum so your machine can cope.
Hi Louis, I love your videos, I always learn something ! :-)
I have an 820-2330 I'm trying to repair, the previous owner try to reflow it in an oven .. anyway, no liquid damage
PP3V42_G3H is 3.3V
SMC_BC_ACOK is 3.3V
ADAPTER_SENSE sense is 0V
So ONEWIRE_OVERVOLT is 9.47V and QQ6915 is active and send ONEWIRE_EN to ground. (0V)
I've tried another know good DC-IN board with the same symptom, I don't understand why I got no ADAPTER_SENSE, charger is working fine too.
R6920 is 24K and OK.
There is no short to ground on adapter sense
Could someone help please ?
Thanks :-)
So excited about life but then again, I'm a thinkpad fan-boy (except they don't exist)
+Shaya Maddex Since when? Thinkpad are still around, they just belong to China now.
What chair are you sitting in here?
A crappy macy's recliner
How old is this Macbook Pro?
Are you sure that these schematics are so badly drawn by Apple? I have never seen a schematic with a loop in a wire (unless it is supposed to represent some antenna or board inductor, but it will have a long description next to it).
I'd guess something went wrong on the way from Apple to your PC. I guess Apple does not put a URL of laptop schematics in the background either...
if I heard that right your cat has the same name as me
Louis i'm a highly qualified It man i did my degree in Graphic Design and Multimedia in England did my Cisco studying as well but really i'm not into this stuff any more i hate being on a laptop 24 hours designing... i have a very good experience in repairing laptops but not to a component level i will i will be able to troubleshoot laptops using schematics sometimes i think i wasted my life studying IT the pace that this technology is moving is frightening and we should keep updating our skills otherwise you are fu@@@ up
goddamn it now i'm gonna have that covergirl jingle in my head
lm397s can be replaced with a lot of other opamps and the fet can be replaced with a huge number of things
often on old motherboards i cross reference parts when the customer is a real bitch and willing to pay to have it fast
also the disconnected lines are there but the person who stole the schematics from apple and then exported them to pdf screwed up the rotation of those wires
it's a common problem with converting schematics to pdf
+Andrew Brown most people tend to replace it with a wire :((
It's pretty easy to hate on Apple, but just because you downloaded a crappy schematic from a random web site that is missing symbols isn't a valid reason. You can't make a pcb with that many things missing, it just doesn't happen. That pdf was just plain mangled somewhere along the way, be it on purpose or accident.
+Reed Arnold If you look carefully in the last schematic and compare it with the good one, it seems like a bunch of the lines and labels were simply moved. Somebody probably fucked it up along the way, I seriously doubt Apple would produce such garbage.
+SWEDEN YES Incorporated there is a giant watermark in the background to some obscure site. no need to really compare to anything as it's not authentic once anyone has done something like that.
+SWEDEN YES Incorporated go over to the PP1V05_S5 circuit and you will realize that during this year, Apple created a lot of garbage ;)
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