I did attempt to desolder the R030 from the board, it was very difficult and I was not successful. When they arrived they were also a lot more tiny than I expected! I bought some replacements from Ebay here (opens in new Window): MCS1632R030FER – Ohmite – Current Sense Resistor they were a lot more expensive than I expected. If the resistor is faulty it will be giving false readings to the chip and hence Kindle not charging properly.
These indicate the 30 Ohm resistor is what the chip is referencing to measure charging. – Coulomb count while charging/dischargingġ5-bit ΔΣ-ADC measures the battery’s charge and discharge current by means of an external current sense resistor – 15-bit ΔΣ-ADC with External Current Sense The data sheet mentions the following:Įmbedded Coulomb Counter for Battery Fuel The data sheet for that chip is here (opens in new window). The larger chip further down the charging circuit turned out to be a BD71815AGW. This is a tiny resistor and looked like a very challenging soldering operation but I had heard replacing it fixed the issue. I did a little research and the recommendation is a hogs hair brush for cleaning this up, I have picked one up for next time. Thh q-tip left behind some fibres that you can’t see with the human eye but the camera picked up. The port was pretty messy with flux by the time I finished, I cleaned it off with a q-tip and some isopropyl alcohol. I thin kthis would have been a lot easier if I’d had access to the Chip Quick I mentioned earlier.Īs this was my first go I used up heaps of desoldering wick! I would know better for next time. In the end the copper braid was the best way to remove it but you need a large soldering iron tip with a lot of heat to get the join hot enough for the copper braid to soak it all up. I looked into several different methods including using a solder pump and adding low melting point solder paste. I found this desoldering the most challenging part of the whole operation. Copper and Solder are best friends, the copper braid will attract the solder and pull it out of the holes. This is where the copper braid comes in handy. Once you have the port removed you can see in the photo there is a lot of solder left behind in the anchor holes. Isoproyl Alcohol to clean the flux off with.Something to clean flux off with, I used a q-tip (cotton bud).Something to apply the flux, I used a wooden toothpick.
The important thing to realize is this job is microscopic and too hard to do with the naked eye. Magnification of some sort, either a Helping Hands tool with Magnifying, a separate magnifying glass, Mircroscope, mobile phone camera attached to a monitor or something along these lines.You will need some supplies to tackle this job: Removing the USB port from the kindle is quite challenging for a beginner. I used this seller with no issues: (opens Aliexpress in a new window) 10pcs Replacement for Amazon Kindle Paperwhite mainly because the photo was good so I could see what I was getting: Here in Australia the delivery is way too expensive from the big sites so I got 10 pieces from. If you are in the UK or USA you can find these at Mouser, RS components or similar electronics stores.I've trodden on a few over the years and its always painful. The UK plug is a good design but the drawbacks are that its pretty big and its like a caltrop if you leave a cable lying around on the floor. They use a plug that has rectangular pins and you always get the ground pin and a fuse. Some have it as a metal strip that runs along the top and bottom side of the plug that touches the a contact in the socket.Įverybody uses something similar to that two rounded pin design in Europe except for a handful of countries and thats the UK or have/had substantial ties to the UK. Some have it as a socket on the plug and the ground pin is actually on the wall. Some have it as a pin thats offset from the existing two pins. Some have it as another pin in the middle of the existing two. The variation is how the ground connection is done. The basic European plug is something that has two pins and the pins are cylindrical in shape. Going to the web and searching, I'm generally only finding one-size/shape. Any Europeans in this thread that can explain/expand on the size/shape of adapters/sockets.
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