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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 07-09-2012, 22:58   #1 (permalink)
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iPhone 3gs another white screen problem

I was given an iPhone 3gs to replace the wifi antenna and the signal antenna connectors, as always removing the motherboard to sit under the microscope.

On work completed, put board back into iphone, powered on but nothing on screen, plugged into charger and the iphone bleeped as if it were working. I pressed the on off button and the screen showed white, if I switch off and back on again, same again, blank screen then screen shows white. I looked at the reverse of the board and inductor was missing 66.6 ohm one, I have replaced this with another one from another 3gs but it is still the same. The top solder pad of the inductor was missing but this looks as if its a direct connection to the inductor to the right of it so I linked them together, where does this 66.6 ohn inductor pin out to?

What have I done wrong?
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Old 07-10-2012, 08:05   #2 (permalink)
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Hope this helps. Have you tried a hard reset? was this R121_AP missing before? Have you tried other screen?
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Old 07-10-2012, 21:22   #3 (permalink)
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Quote:
Originally Posted by dog68 View Post
Hope this helps. Have you tried a hard reset? was this R121_AP missing before? Have you tried other screen?
Tried hard reset and using a good screen, think your circuit diagram might give the answer, if the top pad is missing, I have assumed it was just a link, howver might the top pad be the link to the fpc connector, I will try a flying jumper tomorrow..cheers
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Old 07-11-2012, 23:13   #4 (permalink)
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Circuit tests ok, tried with a broken screen and displays, al be it white ish but does display, when I put a good lcd in, screen is blank until the iphone loads the system then just displays white when the home or on off button is pressed
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Old 10-07-2012, 19:02   #5 (permalink)
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Greetings from Amsterdam, Hallo People, Well i just managed to roger an iphone 3gs 32gb.I bought it second hand, it was stuck on itunes logo after the previous owner upgraded to ios 6. I managed to get it going , jailbroke it installed ios 4.1. Then i found out that it was not charging via wall socket or usb port on computer. Well it did charge , but only a bit and would not charge any further , so i managed to jailbreak with this little charge. Also found out during the course of jailbreaking that the home button did not work at all, managed to put it in dfu mode through blackra1n. All went through beautifully. Read on google that it is a battery problem , so i changed the battery from another dud 3gs 32 gb i bought second hand, no joy. So i googled further and concluded that it was the dock connector , bought a new one and went about replacing it, in the process of replacing it i botched up my LCD, got a white screen, numerous attempts of replacing connectors 1, 2 and 3 did not solve the problem. I could hear the sound from the iphone saying something about my music etc, itunes recognised it, but the white screen would not allow me to see whether the issue of charging and the home button was resolved or not.

Decide to test the whole top portion LCD,DIGITIZER ETC ON ANOTHER PHONE AND YES THE LCD WORKS ON THE OTHER PHONE , DECIDED TO SWAP LOGIC BOARDS AND AGAIN BOTH LCDS THAT WORKED ON THE OTHER PHONE DO NOT WORK ON THIS ONE. dEDUCTION ROGERED LOGIC BOARD.

aBSOLUTELY CLUELESS AND WILLING TO EXPERIMENT , ANY SUGGESTIONS AND HELP WILL BE A GODsent if there is a ***.
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Old 10-07-2012, 19:19   #6 (permalink)
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Did you try hard reset? I know you said home button not working. Did you try clean home button to. Ale work?
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Old 10-07-2012, 19:57   #7 (permalink)
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Hi Thanx for the rapid response , tried cleaning the home button , dont know if i did it well, but cannot hard reset as home button not working
cheers
m
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Old 10-07-2012, 20:11   #8 (permalink)
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H just tried to clean home button and replaced the top cover now the screen has horizontal stripes on it instead of just a white screen and i can hear the telephone saying nothing found .
cheers
m
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Old 10-07-2012, 23:15   #9 (permalink)
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Check the LCD_VBOOST Circuit!
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