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Touchscreen and LCD not working after reconnection

So I got a working iPhone 3G from my friend, but there was a little dust under the digitizer, so I opened it up and cleaned out the glass, (blow-dryed it out on cool) and reassembled it. Then phone was on while doing this. I also pull a little bit of plastic covering off of the gold part on the top of the LCD. Completely resembled, the LCD/touchscreen doesn't work. Removed/re-installed logic board, nothing. Restored the software, nada. Cleaned the contacts with alcohol, still nothing. It receives calls and the vibe switch works so I know its not the logic board.

I have no idea what i did wrong, I read somewhere that you're supposed to remove the battery. I have no idea what went wrong, everything was working before. help!

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any chance of a photo to show the LCD as it is now?? ie without the gold part. Or take a look at the parts section for 3g and describe with more detail where this part was. I suspect this is the error you have made, but you could try dusting all the connections anyway.

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@pollytintop check here: http://www.gcsdblogs.org/roodhouse/wp-co...

its the top right gold part, there is some clear plastic covering over it. IDK if that does anything. Also, the weird thing is is that the touchscreen is not working also. So if the lcd doesnt work, does that mean the touchscreen will not work either?

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it's difficult to tell from your photo... it looks ok. thing is that there is NO piece of plastic you need to remove, I can only think you have removed the entire plastic cover/protector that wasn't removed earlier?? it would've been the same size as the screen.. whatever has happened it sounds like you have tried all the tried and true means of testing the LCD. As none of them worked the only thing left is a replacement LCD. It is difficult to tell whether the digitiser also needs replacing... but when you turn the phone on try swiping across the top of the screen where slide to unlock would normally be. If you hear sounds then it's ok. either way, replace the lcd and then you'll be able to see if the digitiser responds.

before doing that I'd still clean the connector no 1, check the pins, reseat connector.. it's amazing how many times you think you've done it right and no! the connector isn't on fully or has popped off when you are closing the display. check and double check!

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Unfortunatley the digitzer doesnt respond, ive tried calling it and pressing the answer button but to no luck. ive cleaned everything, looks like im ordering 2 new parts then!

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also, does a non working lcd as mean a non working touchscreen? neither of them work, and they both were working before.

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You can have either one broken independently of the other. It would seem you've been extremely unlucky to have broken both. I'd be a lot more careful this time, don't force anything!

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Great :P is there a way to tell if my connections on the logic board itself are bad? I don't want to buy a new display assembly and have it not work.

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The only way to do that is with a known working screen/LCD. Borrow a friends? Make sure it's the same generation ....

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you could get a new screen or take it to a place where you fix it

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I think the phone being on when you took it apart may be part of the problem you're having with the display. No direct experience with it, but I've seen a lot of posts online saying to turn it off before taking it apart.

I don't really understand what the clear part you removed is, and can't tell from the pic either. I'm not sure that this is the problem.

One thing might be to ENSURE that the display connectors are fully on. I've had experience with them appearing to be on, but not fully seated on all corners. I'd check each of those... you should be able to feel it snap in.

As pollytintop said, if you had a known good one you could borrow (of the same model, GB size doesn't matter) and made sure to turn it off before replacing it, it could tell you more about what you would need to buy.

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well i know the LCD and digitizer are not working for sure. what i'm more concered about is that the connectors on the logic board itself are damaged. I don't see any visual problems, but is it possible that i shorted a connector? or is that a very rare occurence?

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I took a look at the pic more closely. do you mean the part where the ribbon cable meets the top edge of the LCD? I don't think that there is anything that should be taken off there. But that shouldn't affect the digitizer, too.

the problem with a short is that it's hard to know what shorted out. The connector itself may appear fine under a magnifying glass, but have some other part of the circuit fried. Sorry, don't mean to be alarmist... I'm not actually 100% sure about it being possible to fry something in that manner.

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