User Guide

NPE-3

Baseband Trouble shooting PAMS Technical Documentation

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Phone is dead

J103 (VB) or

V440 Katode:

VBAT = 3.6V

Failure in VBAT line

Check X120, X121, L123

J102 (WDDIS) = 3.6V

Faulty N102 or

faulty PCB

J108 (VBB) = 2.8 V

J105 (VXO) = 2.8 V

when PWR switch is pressed

or J102 is grounded

J102 = 0V when PWR switch

is pressed or X002 pin 11 is

grounded

See section:

"Power Doesn't Stay On…"

Faulty N102 CCONT

Check PWR switch.

Check WDDIS line:

PWR switch ->

J102 -> X002 pin 11

Faulty PCB

Yes

No No

Yes