7 ms·
First thought is that probably a SMD component has shorted itself out. Unfortunately that's default behavior for many SMD components -- short circuit instead o
by bb88 9y ago
First thought is that probably a SMD component has shorted itself out. Unfortunately that's default behavior for many SMD components -- short circuit instead of an open circuit.
If the power adapter supplies 20V (which sounds like it might), then any components which might have shorted them selves out could be passing 20V to the other usb power line right next to it.
The other side of the machine probably has another USB controller, which likely explains why it's fine.
So, in short, I don't think this is a problem with USB-C, just a bad luck of the draw that you got a failed component along the way.
Edited to add:
Louis Rossmann's macbook repair Youtube channel is pretty good at discussing why things fail for a mac.
https://www.youtube.com/channel/UCl2mFZoRqjw_ELax4Yisf6w https://www.youtube.com/channel/UCl2mFZoRqjw_ELax4Yisf6w
- konschubert 9y agoWhat is SMD?
- nasalgoat 9y agoHe probably means SMT - surface mount technology.
- dsr_ 9y agoSMT is the technology; individual devices are SMDs, or "surface-mounts" or "surface-mounted". Beyond terminology, SMD are much harder for an individual hobbyist to desolder, replace and resolder than through-mount, but they are easier for pick-and-place machines to deal with. If you're prototyping a simple device, you can start with a breadboard -- no soldering. Then you can get a circuit board printed to your spec and use the same components, for low-volume work. If you need high-precision placement, you will probably need to transition to surface-mount.
- jonhendry18 9y ago"Beyond terminology, SMD are much harder for an individual hobbyist to desolder, replace and resolder than through-mount, but they are easier for pick-and-place machines to deal with." And SMD are smaller, allowing smaller circuit boards and smaller devices.
- graystevens 9y agoSurface Mounted Device/Technology (https://en.m.wikipedia.org/wiki/Surface-mount_technology https://en.m.wikipedia.org/wiki/Surface-mount_technology)
- gsteinb88 9y agoSurface mount device: https://en.wikipedia.org/wiki/Surface-mount_technology https://en.wikipedia.org/wiki/Surface-mount_technology
- diabeetusman 9y agoSurface Mount Device; sort of the opposite of through-hole, they're both soldering and electronics mounting methods. https://en.wikipedia.org/wiki/Surface-mount_technology https://en.wikipedia.org/wiki/Surface-mount_technology
- jburgess777 9y agoSurface Mount Device. The name given to components which are soldered directly to the surface of the PCB (printed circuit board). SMD devices are very common now and replace older components which had legs (or leads) which had to pass through holes in the circuit board, also known as "leaded components" or through-hole.
- wlesieutre 9y agoAdding to the other comments, this is in contrast to "through hole" components with leads that poke through holes and are soldered to pads on the reverse side of the board.
- Rebelgecko 9y ago> The other side of the machine probably has another USB controller, which likely explains why it's fine. Unfortunately (well, except in this case) that's true. On the 13inch MacBooks, the ports on the right side have less bandwidth and can struggle with multiple 4k displays
- stefan_ 9y agoYou need to remember what you are asking for here. Two 4k displays already require 30 Gbit/s of bandwidth.
- Filligree 9y agoThen they should be labeled appropriately, and preferably use different form factors. There's no excuse from having identical-looking ports that do different things.
- JonathonW 9y agoThat appears to be kind of the point of USB-C-- identical-looking ports which may or may not actually do the same thing. A given USB-C port might be a host port; might be a device port; might be capable of serving in both roles; might support video (over HDMI or DP or some combination of the two) or might not; might support Thunderbolt or might not; might support high-voltage/high-current power delivery or might not... and all on the same connector, so good luck trying to figure out what supports what without looking at manuals.
- macintux 9y agoSame problem applies to USB-C cables. Understandable why (want to spend $100 for every cable you buy?) but intensely frustrating.
- ansible 9y agoI see it as one of the big failings of USB standards in recent years. USB used to be simple, and they worked so hard to make it so that whatever plug could be plugged into whatever compatible socket. Then we had USB on-the-go, and issues with then a micro-A port isn't just a micro-A port. And now we have USB-C and Thunderbolt. Ugh.
- amiga-workbench 9y agohttps://www.youtube.com/watch?v=AUaJ8pDlxi8 https://www.youtube.com/watch?v=AUaJ8pDlxi8 This video is a good one.
- locusm 9y agoVideos like that and personal experience with MBP's since 2009 have seen my wallet go elsewhere.
- seltzered_ 9y agoFrom googling for a few minutes, I’d make a guess it’s the intel jhl6540 (thunderbolt/usb-c) that may need to be replaced
- _wiv7 9y agoActually, it's not SMD components in particular. The failure mode for many MOSFETs and other semiconductor devices tends to be a short. They only tend to fail open if there was enough energy at hand to blow the short clear.
- dmoy 9y agoAh yes, I remember from lab, you'd get a fail open right after you managed to manufacture a temporarily light emitting diode from things that are not normally light emitting diodes (or maybe not even diodes).
- bsder 9y agoWe call those "Light Emitting Resistors". They result when you attempt to violate Ohm's Law. You can generally diagnose those olfactorily as well as visually. :)
- morganvachon 9y ago> You can generally diagnose those olfactorily as well as visually. :) Indeed, my electronics engineering mentor described it as "letting the magic smoke escape". Once the smoke is gone, so is the magic.
- lathiat 9y agoNow if only you could capture the smoke and get it back inside the chip. It would work again!
- MisterTea 9y ago> exercise Ohm's Law. FTFY ;-)
- phyzome 9y agoOr alternatively, SEDs (smoke emitting diodes).
- 9y ago
- Rjevski 9y agoOn some MacBooks it’s common for the CPU to get charger voltage (instead of the usual 1V or so) if the CPU power transistors are damaged (often due to liquid).
- ender89 9y agoThat's the thunderbolt port, which is designed to pass full current, that's why it's specific to that port.
- ksec 9y agoI thought it is worth pointing out, the newest rumours from Weibo, all latest iPhone and iPad in 2018 will ship with USB-C to Lightning cable. And all Charger will support USB-PD with 18W.