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Model No. A1367 / 8, 16, 32, or 64 GB capacity

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I Pod not charging

Hi all I just replaced a screen on and i pod touch 4th gen. Thought I tested it to see if it was charging as usual. Customer brought it back saying its not charging. I tested it with two working cables and all I get is a battery with a red line and the connect to charger symbol. Cleaned out the port with 99% alcohol and saw no bent pins. I tested the battery at 3.4v but changed it out for s&g's. I pod came on with the new battery with charge in it but still does not show the charging symbol. I tested the internal pins of the charging port that connect to the board with a multi meter and it shows current coming in through those pins. Not sure where to go from here. Thanks for any help.

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Thank you - fascinating. The pic in the post not charging after water damage has annotations saying it's the same as iPhone 4, schematics for which are available online at a Russian site. They show this circuit on p15. The chip you removed and jumpered is CSD75202W15 and is for reverse voltage protection. So the iPod will no longer have that protection, and if it comes back dead again it'll almost certainly be a bad charger, and terminally dead this time!

Google search results for that part mainly cover its replacement in iPhones to cure non-charging. The datasheet indicates that the part has static protection up to 3KV and it can pass over an amp so it's not clear why it should fail, as it evidently does fairly regularly. Water damage is certainly a possibility - the slightest water under the ball grid array chip, or a cracked lead-free solder joint could prevent it from working.

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Thanks for the info. Now I have more information that I am constantly looking for. May I inquire as to where this website may be found? Also can this chip be found? One step forward and two steps back.

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I think I picked up somewhere that Apple isn't happy about schematics being published, and that they try to shut such sites down. Consequently a URL I might give here may not work for someone finding this thread in a year's time, and it might even attract negative attention to iFixit from Apple.

Simply google for iphone 4 schematics and the top result (today, for me) is a Russian site with schematics of a number of iPhones and iPads as well as a load of Nokia, Samsung and Sony devices. Again, google is your friend when it comes to finding the chip CSD75202W15 - there seem to be many sources, including a number on eBay.

I'm wondering what sort of heat gun you used to remove the chip. I just have one designed for stripping paint, which is fine for softening glue on an iPad or iPod Touch but would be like a sledgehammer for removing an individual chip.

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I use a generic hot air station. It has three different size nozzles. Hakkoo has a nice rework station. Sorry for the delay but I've been busy with grand kids.

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The iPod 4G is quite challenging to work on. Did you unsolder the original battery in order to change the screen? The centre contact is the thermistor which checks the battery temperature. If that wasn't making contact (maybe the track had lifted from the board - easily done) then the charging circuitry might think the battery was too cold to take charge.

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Thanks for your response. I did not desolder the battery when I changed out the screen. I only replaced the battery to see if it would make a difference after it came back. Thanks

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It does sound a bit like the charging circuit is dead. If it was indeed working when you first returned it to the customer I wonder if s/he zapped it with a cheap knock-off Chinese charger with poor output regulation.

You said you tested the internal pins of the charging port, but is it taking any current? If you have one of those little digital USB testers which show current and voltage, with a USB plug on one end and socket on the other (cheap on eBay) you could very easily double check whether it's actually drawing any current from the charging port. And if so, can you see the battery voltage rising as you try to charge it?

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Using a multimeter to check voltage on pins 4 and 9 from the right on the board while its connected to a charger. Pin number four is reading 5.2v and pin nine is reading 2.1v .

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Thank you Philip. I researched the charging circuit and tested the necessary components and it turned out to be just that. I removed it and replaced it with another component from a dead board and it is now charging like it should be. Thanks for pointing me in the right direction. Cora

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Hi Corlene - Brilliant news, thanks for sharing! I looked for a schematic but couldn't find one. Can you share details of what you did, presumably involving micro-soldering?

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Corlene Ray will be eternally grateful.
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