Iphone 4 dropped no wifi - GSM-Forum

beastien · 07-31-2012, 14:52

Have an iphone 4 that was dropped (thrown very hard actually), and now wifi is greyed out and bluetooth is spinning.

I've checked voltages and have both battery and 1.8v, there is no broken lines.

I reheated the wifi chip but made no difference.

I don't think it's a definate check, but I measured resistance on Y2_rf crystal and am getting different results to a known working board.

Is there a way to check the crystal?

Reinsaddict · 07-31-2012, 15:08

Does it read the imei?

beastien · 07-31-2012, 15:10

Yes, no problem with IMEI.

dog68 · 07-31-2012, 17:28

You may have caused more harm, than good heating ic, will need to be reballed, check around ic's for cracks in glue/epoxy.

beastien · 08-01-2012, 00:42

The epoxy doesn't look like it's been affected, but I guess that's not an exact indication.

beastien · 08-01-2012, 13:48

Any ideas or suggestions to what I should look for or test?

ps3xbox · 08-01-2012, 16:32

Quote:

Originally Posted by beastien

Any ideas or suggestions to what I should look for or test?

my friend the y2 crystal is not measured in ohm(resistance), you need oscilloscope or a good multimeter that has hz setting to check but anyway wifi option would still show up most times even if the crystal is bad so check the 7 points of continuity from u2 to l21 c141 etc

07-31-2012, 14:52	#1 (permalink)
beastien Junior Member Join Date: Oct 2006 Posts: 18 Member: 362786 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	Iphone 4 dropped no wifi Have an iphone 4 that was dropped (thrown very hard actually), and now wifi is greyed out and bluetooth is spinning. I've checked voltages and have both battery and 1.8v, there is no broken lines. I reheated the wifi chip but made no difference. I don't think it's a definate check, but I measured resistance on Y2_rf crystal and am getting different results to a known working board. Is there a way to check the crystal?

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07-31-2012, 15:08	#2 (permalink)
Reinsaddict Junior Member Join Date: May 2012 Posts: 24 Member: 1757226 Status: Offline Thanks: 3 Thanked 1 Time in 1 Post	Does it read the imei?

07-31-2012, 15:10	#3 (permalink)
beastien Junior Member Join Date: Oct 2006 Posts: 18 Member: 362786 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	Yes, no problem with IMEI.

07-31-2012, 17:28	#4 (permalink)
dog68 Freak Poster Join Date: Mar 2012 Location: cambridgeshire, England Age: 44 Posts: 423 Member: 1728699 Status: Online Thanks: 136 Thanked 91 Times in 80 Posts	You may have caused more harm, than good heating ic, will need to be reballed, check around ic's for cracks in glue/epoxy.

08-01-2012, 00:42	#5 (permalink)
beastien Junior Member Join Date: Oct 2006 Posts: 18 Member: 362786 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	The epoxy doesn't look like it's been affected, but I guess that's not an exact indication.

08-01-2012, 13:48	#6 (permalink)
beastien Junior Member Join Date: Oct 2006 Posts: 18 Member: 362786 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	Any ideas or suggestions to what I should look for or test?