What I finally concluded was that the pins in the charging port were getting worn out and that it no longer make sufficient contact to charge the tablet. Also, with the non working USB cable, “sometimes” when I slightly bend it towards the back it would charge very slowly.
I knew it's wasn't the cables since I could use those same one to charge my other electronics that uses micro USB. However, I found 1 cable that seems to be able to charge it consistently while a lot of my brand new cables were not able to charge it. I was in the same boat previously and was thinking about opening up my hd 8 to resolder the charging port like everyone had mentioned.
DO OLDER KINDLE FIRE HAVE MINI HDMI PORT ZIP
A trick I found that usually worked even when it was the cord it about half the time made the cord the Kindle didn't like work but popped up saying it was slow charging, when I plugged the cord in I would put either an end of a thin twist tie in the bottom side (the longer side with the little metal hooks to hold it in) and push it in with the plug it, or if the metal wire running through the twist tie worries u I found the end of a small zip tie worked a little better cause it is slanted to make it easier to plug in and no metal wire down the middle of it. I've had both problems work my kindle, when it went from being not the right cord that it looked to being cause of the port I had to push the corks in tightly and position it do that the plug was resting on something keeping the edge with the plug in raised of the table till my kid got on it while it was charging and when I pulled out and took it back the pins inside the port had 2 if them bent and all the way to the back after like 3 days off gently poking and digging around in there I got em straitened out but feared I had broke one off (which ended up being only half broken off) I took it apart to look better and see, when I pulled the motherboard out the port ended up staying in the home it sticks out all the pins on the outside are fine it was just like the other guy said didn't have enough solder on it so now I am going to see if I can modify my solder iron to get that small of a solder, if not then guess I'll be buying a finger topped one that way I know I don't end up connecting two of the pins together putting it back in.
This connector would have been ok to use if it were soldered to the board, but mold to the plastic case would had to have been changed to give it clearence to fit in, without distorting it when assembled. It started charging as soon as I pluged it in. I then wired brushed the pins, and bent them foward a bit, reassembled the unit. The interface connector pins were fine, but the pins that make conncetion the board above were really oxidized, especially the negative pin. This time I took the USB connector out of the frame and looked at it under a microscope. After reading on here some of the post, I took it apart again this morning. But I thought it was the contacts that interface with the USB cable.
I have taken my Kindle apart several times, and thought the intermitten problem was the micro USB connector. My backround is an electronics design engineer in the powwer area. I found this site yesterday, as I been having the same problem for over a year.
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