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01-08-2012, 17:21 | #781 (permalink) | |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Quote:
Then I connected USB again and I saw strange thing: one of the motherboards show just strange lines on LCD. And when USB is connected, I measured 860 ohm between white wire and ground and 680 ohm between red wire and ground (no ground connectivity for white and red when USB is disconnected). Any idea what is happening? Thank you for all the help Wites! | |
01-08-2012, 17:39 | #782 (permalink) |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Update: it shows 9,8 kohm for white->ground when USB is not connected (and it beeps with very fast beeps, like machine gun). Strange. I will resolder the white wire. |
01-08-2012, 18:13 | #783 (permalink) |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Good news. I resoldered wires and now iPhone boots up and stays on. But it doesn't show in iTunes and LCD shows that battery is not charging. But voltage rises to 3,73V on battery red wire when USB is connected. What can I do to get connection to iTunes? Thanks! |
01-08-2012, 20:23 | #785 (permalink) |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Thanks Wites! I know I am asking too many questions but I would like to know, do you have iphone 2g board to check battery terminal readings? My motherboards show really strange things: Motherboard 1: doesn't start up anymore. I cleaned battery pads and the reading for white wire pad moves around 900 ohms and for red wire pad it grows from 40 ohms to 160 ohms. I don't see any shortages even with magnification. Motherboard 2: doesn't start up but LCD shows that empty battery is charging, but voltage on battery is not raising (stays on 3,5V). Reading shows 10 ohms for white wire (no numbers for red wire). Can you check your own readings or give advice where to search for shortages? Thanks! Here are pictures: |
01-08-2012, 22:27 | #786 (permalink) |
No Life Poster Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 38
Posts: 3,473
Member: 1017374 Status: Offline Thanks Meter: 2,594 | Quote: I ask because it will not show precisely omh with battery connected. If first board have that reading chk with battery for heat where is short there will heat. |
The Following User Says Thank You to Wites OM Tesla For This Useful Post: |
01-08-2012, 23:04 | #787 (permalink) | |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Quote:
What do you think, why is ohm reading rising for battery pad on first board? Capacitor somewhere? | |
01-09-2012, 00:15 | #790 (permalink) |
Junior Member Join Date: Feb 2011 Location: Estonia
Posts: 16
Member: 1509123 Status: Offline Thanks Meter: 0 | Of course. I'm really puzzled as my iphones are acting really strange. Now I don't have short circuit in battery wires and green fuse has jumper but it still doesn't turn on. I try to study schematics, I'm beginner. Thanks for all the help, Wites! |
01-09-2012, 02:01 | #791 (permalink) | |
Freak Poster Join Date: Oct 2011
Posts: 343
Member: 1678566 Status: Offline Thanks Meter: 16 | Quote: Basically I was trying a few batteries. I took out an APN: 616-0431 battery that didn't boot the phone, I put in APN: 616-0428 and it worked, then I put in another 616-0431 battery and it worked also, and then I put in the original 616-0431 that didnt boot originally and this time it started. The boot is weird though. When I first start the phone the Apple logo is dim, and 5 seconds later its usual brightness. | |
01-11-2012, 09:20 | #792 (permalink) |
Freak Poster Join Date: Jan 2009
Posts: 149
Member: 937918 Status: Offline Sonork: lepper4 Thanks Meter: 6 | 3G 3GS wifi holder replace My brother gave me his 3gs to fix as his wifi would not work at all. I opened it up and noticed the wifi connector was off but i wondered why it would clip into place. Then with usb microscope i seen that the wifi holder was cracked and pieces missing. I have ordered a new wifi holder but would anyone know how i would go about taking the old one off and replacing the other one. I have some skills in this area using heat guns soldering but haven't came across this. can anyone help. |
01-11-2012, 09:24 | #793 (permalink) | |
No Life Poster Join Date: Dec 2009 Location: Malta Age: 36
Posts: 515
Member: 1176031 Status: Offline Thanks Meter: 62 | Quote:
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