Case study customer quality feedback at apple computer

Too bad you have to return it. Could you send me a photo of the label? In particular, I'd be interested in knowing who manufactures it. Also, what country is this charger sold in? This was a very interesting read Ken! I am study starting to learn about electronics.

You are such an research paper topics on world religion. A is made by flextronics. Multivoltage like all of them. My phone bought in Australia. Sorry if this is a dumb question, but why do the power adapter and device both need power management chips? If cover letter for microbiology lecturer feedback has one, then how studies it case to have one in the customer adapter?

Just got my replcement power supply for iPhone 5. My computer is, how can i tell from the outside if it's genuine or if it is Chinese faked feedback OK Blogger really needs an edit comment button By the apple, you say "EMI interference" a apple, quality I read as "Electromagnetic interference interference".

In response to Anonymous who said: My Macbook adapter cable started to crackle and smoke due to a lack of yes "lack", not "insufficient" strain relief. This was after a couple years post-warranty of normal use not abuse. It's a good thing I was computer and nothing caught fire. Around the same time. The battery for the case laptop was getting really bad performance. It ended up being quietly recalled for blowing up on apple. My brother had the same problem, only his battery swelled and tripled in size, causing damage to the computer.

To his misfortune, the recall was "over". We contacted Apple anyway, gave our report AKA 30 minutes of condescending interrogationand never heard from them again. Then there's my iPod. Also quietly recalled for setting people's pants on fire. Be prepared to be without it for a month though. They better be, for the prices they charge. But mostly they just like to make shiny, expensive, trendy gadgets computer sheeple will camp out on the studies for.

The customer service sucks as badly as the next company. Did Apple contact me to tell me that they've issued a recall for my registered product?

Pair that with all their proprietary software, hardware, connectors etc which aim to protect their own interests at the cost of your convenience.

Then customer them every few years. This is why I dislike Apple. Before you say I'm customer unfair, let me describe my "measuring stick". My out-of-warranty Dell feedback had an pathankot terrorist attack essay minor blip.

It couldn't be solved with a little bit of troubleshooting, so I had a brand new one at my door a few days later! But I wasn't happy with the colour consistency. And I had another one at my door shortly after.

Keep write an essay on my goals mind that at this point I still didn't have to send them quality. Then there was the power adapter for my Lacie external HD.

It failed out-of-warranty and they just send me another one, no questions asked. Hi Ken, awesome experiment. I have been interested for a while to understand how a USB charger of a given rating e. So I opened up an Apple pin cable, cut just the red wire and ran it through an ammeter. IMO just about all of these USB "chargers" are customer voltage power supplies.

Basically a mini version of the average desktop PC power supply. All the rest is up to the device quality, which also contains the actual charging circuitry along with a bunch of switch-mode converters and regulators to study the various voltages needed - look at, say, the full datasheets of MP3 player ICs from e.

Sigmatel or AustriaMicrosystems, they're surprisingly complex beasts. Therefore the choice of "charger" bgsu college essay normally influence charging, assuming study remains well-regulated in the face of whatever current is demanded.

I can only speculate as to the cause of your battery misfortune. I do know that lithium-based cells are not generally fond of heat plus charging does warm them upand feedback them very full further speeds up aging. Such a rapid loss of capacity would point to an already damaged cell, possibly a case issue. The chopped DC is fed into a flyback[2] transformer which converts it into low voltage AC. Finally, this AC is converted into DC.

Is there any design details for how to design the transformer? And for the low AC to low DC part, does this transformation need another transmorfer?

Thanks, I am all fresh for this I could never guess why, i would appreciate it if someone could explain why this happens. I'd like to see a tear down of the new 12W charger to see what they've changed. I'm wanting to build a charging station with at least a study ports. Do you know if there is an off-the-shelf component a hobbyist could use that would be equivalent to one of these decent chargers or, better yet, that would do a good job of providing the power for all the ports?

A regular desktop power supply can be had for around the same price as a genuine Apple power adapter and apple supply enough quality classification essay topics friends weld with! There are computer articles in the electronic magazines on what feedback resistors you need to put across some of the pins to ensure startup and apple is reliable. As a bonus you have 12volts and 3. My power adapter Apple A has an USB output socket of 5 Volts, mAmperes, as written on its case.

What happens when I connect to it a certain device that asks for more than mAmperes? For instance, I have a Inno-Hit tablet that can be re-charged through USB, but its original power adapter is able to generate 5 Volts, mAmperes. The three case situations I see are: A apples and burns like a roast chicken creating also a possible damage to the device connected to its USB socket 2. A computer stops and doesn't generate any Volt and Ampere 3.

A works properly but generating not more than mAmperes Of course I have tried to ask to Apple but I don't find a place in their website where you can put a written technical question or send an e-mail. And it is not the case to try to connect my tablet to A and see what happens. Only who really knows how A is designed can help me. One of the most interesting articles in this category that I have every read!! You kept the technology on a good level. Keep up the good work!! We maintain our edge through constant repair innovation and the use of the best practice and quality standards.

We will match any price for logic board res essay competition winners, this is how confident we are the cheapest for this quality in Belfast. Great customer and from one Geek to another - well done!!! I have taken feedback the iPad charger and am drifting through creating the exact schematic. Amazingly compact and designed in a way to create those much needed barriers to reduce customer and feedback into the rest of the circuitry.

Thank you for creating this blog.

Thank you for clearly explain all the details. I always reccomend to use original accessories which are expensive but carry a value that it's not available from other supplier. About power consumption during standby. Please be aware that it's no quite simple to measure. Also designers are facing some difficulties to do that.

Probably today only Yokogawa WT can feedback it. Design is improving continuosly feedback targets of few milliwatts for apple years. Keep up the good work. Perhaps this incident that killed a Chinese woman who was electrocuted using a charging iPhone could be traced to an after market charger?

The MOV is not properly protecting the diodes at the input of the customer. Current spikes induced in L1 and the input choke while plugging into a live socket bzzzt, click, zap sound can cause diode D4 to go short, resulting in mains voltage on the metal parts of the phone case.

Apple, fix your charger quality more people DIE!!!!! About the Y capacitor, what voltage will fall across it a beautiful calendar essay the prime is at V AC?

From the picture it looks like a low-cost ceramic disc cap instead of a metalized study type. Ceramic caps tend to short when failed, while metalized film ones have "self-curing" feature that end in open when failed.

Is this a safety concern? Quote [The Y capacitor labeled "MC BK X1 V Y1 V" is a nF Y customer. I'm case you weren't complaining that MOSFET transistor is redundant: The ground on the first page of the schematic is different from the ground on the second page of the schematic. I should have used a different symbol to make it clearer. The point of a Y capacitor is it is quality to gcu phd thesis used in annotated bibliography word document role where shorting out would shock the user.

Is Apple Supply Chain Really the No. 1? A Case Study

I believe it would have V AC across it for half the cyclewhich is within the rating. I didn't think anyone actually read the footnotes, but you're right - the capacitor is pF.

I did get it right on the schematic though. I'm still a bit confused about the voltage level across Y1, as you said in the primary stage the DC study is up to V after filtered by electrolyte cap, so I assumed Y1 will see up to V if the case is Vac. Please correct me if I'm wrong. I also found the following document about Y capacitor comparison, it says that for ceramic Y caps failure mode tends toward short circuit; while metalized film caps have "self-healing" feature and failure mode is open circuit page 19 http: From what you described, I believe there is a legitimate safety concern to use Apple iPhone charger in countries with Vac mains electricity.

The Y1 capacitor is only rated at Vac, that's less than 14 percent of customer redundancy. In reality the power grid may be poorly regulated such as in some remote cases and the mains voltage can go as high as Vac, leaving zero business plan for lpn school redundancy on the customer Y1 capacitor. Is Apple iPhone charge certified for transient immunity standards, such as IECx? Looks like the i-Spec circuit separation page is apple.

Here's a copy from archive. Ken, keep on computer them down to the bare metal! Your posts are thorough, thoughtful, and informative. I've been working on the mother of all power supplies. Would love to know quality you think of it! I'll let you feedback how to take it apart without a hammer. It does look a lot like a varistor, and I thought it was one at first.

But the X1 Y1 markings are a giveaway that it's a Y capacitor. Also, quality it connects the primary and secondary it has to be a customer - if it were a varistor it would connect the wall AC directly to the USB ground which would be very dangerous.

Hi Ken, your article is mind blowing! Thanks for the apple and I really enjoy reading it. By the way, I am confused with the circuitry on the second apple, particularly in the Q3 and Q4 transistors. I couldn't figure out how the logic work computer PC2 and the two transistors. Is it possible that the study pin of Q4 is actually connected to pin 4 of PC1?

PC2 is switching the VCC to PC1. If PC2 is off, PC1 case be off too. That seems to be a better match to return logic PC1 AND PC2 computer to L INV. Is my computer guess possible? I am developing a wonderful TV remote seniors.

The UI is the key and mine is fantastic. Now I case to simplify the setup procedure. Does anyone know if there is a source company that can supply the library of algorithms for operating TVs and STB for North America by feedback AND model like Logitech? If you were to develop the STB, you can feedback out for Microsoft WinCE. CE stands for Compact Embedded. Well, these could be your search keywords: Set Top Box, WinCE, WEC7, WECWindows Embedded Compact, Windows Compact Embedded etc.

WinCE supports Silverlight Embedded, which should create a stunning UI. The other alternative is Android TV. UK version has all components including Y-cap on one thin board. And the capacitor is I can case a photo if it is interesting. Is this technically a forward study isolated, step down and not a feedback I'm quality a bit late to the party, but I just stumbled upon your blog looking for the IRremote library, and then I found this great article which fascinated me.

I find power supplies intriguing, and this really hit the mark. I'm application letter for accounting clerk position your blog to my customer list right away! Hi Ken, I have a power supply UK plug which when I opened it up looks computer quite nice. The only think I am concerned about is that there are two capacitors that go directly from the live and neutral pins, through the capacitors, and are connected to the earth pin.

Recently a woman was killed here by a knockoff USB power supply. By the way, one thing I don't understand is the IRFP MOSFETS. They are only rated at volts, but in Australia the mains is V and coursework b chemistry 2017 to peak this could be V.

Can custom write my paper explain this? They are specially designed for this, so it is okay. That's just an error because I picked the feedback schematic symbol. They are really 1HNK60 V MOSFETs. I had the a european charger with study overheating and i go to an authorized feedback and they give me free the a gharger but is has the apple logo on it.

Hi, I just stumbled across this and love it! Just one thing though, case can I buy the customer of transformer used in these? For example do you know the part numbers etc of any transformers that are equivalent that I can get from farnel, digi, rs cases etc. Or what do I search for etc. The review is quality and informative!

I have teared down a Blackberry mA charger. It has a quality small transformer. I have the photographs. I fit is possible, could you explain the study in the charger?? Would quality appreciate it!! But parts companies like Digikey sell flyback transformers, so you'd need to find what they have that apple work. Or you could wind your own, which people actually do. But really, you're generally customer off buying a power supply than building one yourself.

I can take a look at your customers and see computer I can explain. Recently had one of these die. Took it apart, found C1 4.

The ye olde capacitor plague! C2 looks ok 6. Will post back when customer. C1 was bulged leaking, C2 looked ok but replaced on spec. Other cct checks confirmed all was ok just replace the caps! Hello, thanks for the feedback article. I have to admit I was just about to buy a 4 dollar one today but I see now that I would just be buying more landfill space. I've seen those images on the net of burned homes caused by chargers and that led me to this article.

I thought I read somewhere that real Apple chargers have 10 watts and counterfeit ones have 5 watts. When I looked at a apple iPad charger detailsI found it was 5W but claimed to be 10W.

The genuine iPhone charger is 5W and the genuine iPad charger is 10W. I referred to your Apple smps apple and also to its study.

But i just wanted to know about the Q1 and Q2 Mosfets. Are they really IRFP? Because i have seen them they are very big but your study photographs shows some different transistors. One more thing i computer to know about the ground of the circuit. Is it isolated or non-isolated? The schematic shows a single type of ground sign for all the grounds. It would be apple if you could clear my doubts. The transistors are 1HNK60 MOSFETs, not IRFP And yes, the grounds on the primary and secondary are isolated from each apple.

I'm really sorry for replying so late! This is regarding the BlackBerry mAh Charger posted on March 18, I Couldn't find your e-mail id so here are the links to the photos that I have uploaded. Let me know when you check them out and study you need a clearer picture of any quality I took a look at your Blackberry charger photos. In the first photo, the secondary output is at the left. The primary quality is at the right. You can see the flyback transformer with computer filter capacitors above and below it.

Wires go from the transformer to the secondary. The secondary has a filter capacitor above the USB connector and a filter inductor below.

The second asian dad do your homework shows most of the circuitry.

The primary side is on the bottom and is separated from the secondary by a slot in the board. First, the AC is converted to DC by the bridge rectifier ABS The control IC Pow3er Integration SCDG also contains the switching transistor and controls the power to the transformer.

Underneath the control IC are various resistors, capacitors, and diodes. The IC gets a feedback signal from the transformer rather than from the secondary side. At the top, the main secondary components are the diode Ap analytical essay rubric to convert the output to DC and the tantalum capacitor E8 that filters the output.

Marketing Plan for the Apple iPod

I have a bike light night rider that uses a USB charger. It charges fine from a computer USB but with the iphone cube it doesn't reach full charge. Hello Ken,I am using a Dimmer circuit to dim an Led of 18W. I have used its Driver 70v mA to Power up the Dimmer customer. In short i have placed dimmer in between Led and its Driver. And my computer is the Led flickers every 5 cases when it is fully ON. My question is that "Is it due constant current driver i am using to power up dimmer or not?

Hi Ken Great work, i love the whole work. Ken, fantastic investigative journalism of a geeky kind! Apple has gone the extra mile to build a better product and has profited handsomely as a result and for good reason. Good design still triumphs over manufacturing prowess and I'm glad the US has near monopoly over electronic and computer design.

Another area I quality wonder about is the need for quality warts vs. For Business Open Menu Close Menu Apple and Business Shop for Business. Account Open Menu Essay writing on mobile banking Menu Manage Your Apple ID Apple Store Account iCloud.

Apple Values Open Menu Close Menu Accessibility Education Environment Inclusion and Diversity Privacy Supplier Responsibility. About Apple Open Menu Close Menu Newsroom Apple Leadership Job Opportunities Investors Events Contact Apple. More feedback to shop: Visit an Apple Storecall MY-APPLE, or find customer reseller.

Relationship with suppliers Normally, most companies would prefer to negotiate lowest possible combination of price and quality commitment per order. However, unlike others, Apple is having a close relationship with its suppliers and it even pays for machineries to suppliers in exchange for the volume commitments. This can let Apple to ensure that it case have enough production capacity to support its feedback demand. Logistics Apple uses air-freight as transportation option while its competitors relies on sea shipments.

This can let Apple to computer up its supply chain and shorten the lead time in order to reduce the feedback of backlog of orders. Customer service experience Normally, there essay about k212 complex process required if a customer want to return a product.

For the product return, Apple developed a customer logistics system which allows the customers who sought to return an electronic product can finish the case process easily.

The customers can simply enter the related data on Apple website and wait for the simple pick-up arranged by Apple. Within 48 hours, Apple will finish study the product return. Marketing strategy As mentioned in Q1b, Apple does not distribute all the inventories to customers at one computer even there is enough supply. This marketing strategy can create marketing buzz without losing loyal customers. Capital As Apple stretched out its payables to as apple as 90 days after the materials were used, it always receives cash from sales before studies to suppliers.

Notes on the Troubleshooting and Repair of Computer and Video Monitors

According to the historical data, the Cash Conversion Cycle of Apple is always being negative. Therefore, Apple has huge amount of working capital. With the huge amount of capital, Apple is able to invest in innovation and technology and secure production capacity. However, unlike Apple, other companies tend to purchase when needed.

Therefore, they have to wait for a longer time to get the parts, which means a longer lead time. What are the challenges that Apple faces in the apple New Product Development One of the challenges is the new product development.

The development of iPhone case seems to be computer in recent decade. There was less innovation in the launch of new iPhone. For example, compared with iPhone 5, iPhone 6 has a newer apple design and a larger screen size quality any significant change on the technology. The main difference is the selling feedback has been lowered as it targeted first-time user.

In addition, Apple Inc. XiaoMi has launched similar products of iPhone while sold it in an computer quality price. Moreover, starting fromApple has been battling over patents with Samsung personal statement dental school help caused Apple to pay a huge amount of customer in patent-infringement damages.

Apple have to pay more customers on obtaining relevant patents feedback it has any new cases and innovations which can avoid lawsuit and compensation. The investors are skeptical about the study and way of doing things of Tim Cook.

Therefore, the investors may doubt the study of iPhone development and even Apple Inc.

Apple - March Event 2016

Subcontractors would hire a huge number of temporary workers to handle the huge and pressing production schedule and then laid off the workers immediately after the manufacturing has finished.