Power-Up Test (V6, Filt_B+) - Motorola i425e Detailed Service Manual

TROUBLESHOOTING: Power-Up Test
3.4

Power-Up Test (V6, FILT_B+)

Note: The following are the DC power distribution voltages with their correct values and the appropriate location to
check the voltages:
RAW _B+ (3.6 Vdc) @ M3 pin 1 battery contact
F ilt_B+ (3.6 Vdc) @ C724
S W2 (1.875 Vdc) @ C702
SW 3 (5.10 Vdc) @ C701
PA_B+ (3.0 Vdc) @ C539
V 4 (2.775 Vdc) @C736
R efer to appropriate DC distribution test troubleshooting flowchart if one of these voltages
is missing.
Test the
battery contacts
of M3:1 for 3.6 Vdc.
Is
3.6 Vdc at
the battery contacts
of M3:1
?
Pass
Test the junction of
E702 and C727 for 3.6 Vdc.
Is
3.6 Vdc at the
junction of E702 and
C727?
Pass
Refer to the
Audio DC schematic.
70
VSIM (3.0 Vdc) @ C714
V1 (1.55 Vdc @ C707 Vdc)
VIBOUT (3.0 Vdc)
V2 (2.775 Vdc) @ C704
USB_VCC (3.3 Vdc) @ C713
V3 (1.875 Vdc) @ C709
Fail
Check power supply
on the bench.
Fail
Check E702 and Q702 components
for US, DFP, etc. Repair, as necessary.
6880401P26-O