Fixed iPhone, tried turning on, worked, then stopped

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iPhone 4

Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.

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chadderbox25 @chadderbox25

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Posted: Sep 4, 2011

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Fixed iPhone, tried turning on, worked, then stopped

Okay, I replaced my screen and battery. I also cleaned up all the corrosion around the connectors (but not inside logic board).

So I put everything back together and hold the power button. The Apple logo came up for 2 seconds, and then disappeared. Now, I connect my iPhone to the computer and it connects, but I cannot see anything on the iPhone screen.

Would it be my screen that shorted out? or would it be the backlight IC in the logic board?

I kind of peaked into the logic board and it looked kind of corroded around the area where the backlight IC is, but when I turned my iPhone on after replacing the screen, the Apple logo was bright.

Help appreciated!

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i think the first thing to do here is reopen and recheck your connectors..if it is the backlight then you should have some faint image on screen. The fact itunes sees it makes me think LCD connection. IP4 aren't my thing though so see if someone more experienced has anything to add about your backlight before you go doing anything.

Sep 4, 2011 by pollytintop

Ok I think I will probably do this. Also, I see NO IMAGE on the screen.. and the Apple logo was bright when I first turned on. I'm also thinking its the LCD connection so I'll check it.

Sep 5, 2011 by chadderbox25

Also just wanted to add that the VIBRATOR button works. When you move it back and forth I can feel the vibrator shutting off and on.

Sep 6, 2011 by chadderbox25

Okay now I took it apart again and now my vibrator button doesn't even work. HELP PLEASE!

Sep 12, 2011 by chadderbox25

Nevermind I connected it to power and it did the same thing, apple logo and then turned off after 2 seconds. Hmm.

Sep 12, 2011 by chadderbox25

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Majesty @majesty68214

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Posted: Sep 4, 2011

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I suggest you clean out the board and it's connectors as well. If you cleaned the remainder of the parts, why would you leave the most important component out. Do not try to power on the logic board till you clean out that board with alcohol and it's completely dry.

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Please do not assume. I have put the logic board in 99% isoprophyl alcohol for 15 minutes, and then dried in rice for 1.5 days (then blow dried to make sure everything was dry).

Sep 5, 2011 by chadderbox25

if your vibrate is working then the problem is def display related

Sep 6, 2011 by pollytintop

I do not think that MAjesty was assuming...;-) I think it was the sentence "I also cleaned up all the corrosion around the connectors (but not inside logic board)." in your question that mislead him....;-)

Sep 6, 2011 by oldturkey03

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i think the first thing to do here is reopen and recheck your connectors..if it is the backlight then you should have some faint image on screen. The fact itunes sees it makes me think LCD connection. IP4 aren't my thing though so see if someone more experienced has anything to add about your backlight before you go doing anything. — pollytintop
Ok I think I will probably do this. Also, I see NO IMAGE on the screen.. and the Apple logo was bright when I first turned on. I'm also thinking its the LCD connection so I'll check it. — chadderbox25
Also just wanted to add that the VIBRATOR button works. When you move it back and forth I can feel the vibrator shutting off and on. — chadderbox25
Okay now I took it apart again and now my vibrator button doesn't even work. HELP PLEASE! — chadderbox25
Nevermind I connected it to power and it did the same thing, apple logo and then turned off after 2 seconds. Hmm. — chadderbox25
Please do not assume. I have put the logic board in 99% isoprophyl alcohol for 15 minutes, and then dried in rice for 1.5 days (then blow dried to make sure everything was dry). — chadderbox25
if your vibrate is working then the problem is def display related — pollytintop
I do not think that MAjesty was assuming...;-) I think it was the sentence "I also cleaned up all the corrosion around the connectors (but not inside logic board)." in your question that mislead him....;-) — oldturkey03