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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 02-13-2014, 07:52   #1 (permalink)
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Join Date: Mar 2012
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Angry iPhone 4 NO VOLTAGE @ R500_RF BASEBAND WON'T START


Hi every one...

The story:

Got an iphone 4 from joblot of other phones, so don't know the history...
Didn't look like water damaged...
The phone came with bb CPU missing,so I've replaced BB CPU & BB FLASH...
Phone turns on but have NO wifi,bluetooth,baseband,iccid or IMEI...
I've had L2_RF=1.3v & L3_RF=1.8v and no voltage at R500_RF...
I've reballed & also tried another U11_RF...
After that reballed U8_RF with no luck but the L2 voltage changed after reball to L2=1.6V & L3 is still 1.8V...

C4_RF
C18_RF
C46_RF
C26_RF


These 4 caps voltages are ok???

Anything else i should check???

THX FOR ANY HELP IN ADVANCE>>>>


FORGOT TO TELL THAT U11_RF IS GETTING VOLTAGE AS FL3_RF READS 3.7V on booth sides & C67_RF getting 0V???

Last edited by loser18; 02-13-2014 at 07:58.
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