Samsung i8700 Troubleshooting 7
Level
8.
Block Diagram
8-1.
Repair
3
8-1
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8-2
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8-3
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PCB Diagrams
8-2.
8-2-1.
Top
8-4
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8-2-1.
Bottom
8-5
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Flow Chart of Troubleshooting
8-3.
8-3-1.
Power On
Power on does not work
Check the current consumption
more than
USB_VBUS_5V
TP: C605, C606)
(
BAT_FET_N
TP: Pin
(
VREG_MSMC1
TP:
(
VREG_MSMC2_ADSP_1.2V
(
VREG_MSME_1.8V
VREG_MSMP_2.6V
VREG_MSMA_2.6V
C449,
TP: C444, C450, L402)
TP: C445, L403)
(
TP: C435)
(
TP: C434)
(
YES
mA
100
YES
4.5V
ī
YES
=0V
2)
YES
_1.2Vī3
D400
)
=1.8
=2.6
=2.6
V?
=1.2
V?
V?
V?
V?
Yes
NO
NO
NO
Download again
Check the IFC600
usb connector inserted correctly?
Resolder or change the U601
Re-solder or change the TR400
Change PBA
YES
Check the
C424.Is it around
09,
Check the PON_RESET_N
TP: TP_PON_RESET_N_PMIC
(
Check the PS_HOLD
TP: TP_PS_HOLD)
(
Mhz Clock at
19.2
YES
YES
END
19.2
=2.6V?
=2.6V?
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C2
Mhz?
NO
)
NO
Check the OSC100 or related circuit
Change PBA
8-6
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8-7
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8-8
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8-3-2.
Initial
Initial Failure
Yes
PS_HOLD
TP: TP_PS_HOLD)
(
=2.6
Yes
END
V?
No
Check the circuit related circuit
8-9
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8-3-3.
Sim Part
Phone can't access SIM Card
Yes
VUIM_2.85V
TP: C439)
(
After Power ON,
Check SIM_CLK, SIM_RST,
SIM_IO Signal inafew seconds.
TP: C700, C701, C704)
(
ī
Yes
2.8
V?
No
Replace PBA
No
check the related circuit, re-solder it.
Yes
Check the SIM Card Module
Re-connect or change SIM-SPK module
(
Yes
END
)
8-10
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8-11
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8-3-4.
Microphone Part
Microphone does not work
MIC_BIAS1_EN
TP: U520 Pin
(
MIC_BIAS1_2.1V
TP: C521)
(
Check the related circuit
Yes
=1.8
Yes
=2.1
Yes
Yes
No
V?
3)
V?
No
Replace PBA
Check and re-solder U520
Is it work?
Yes
END
No
Re-solder MIC520
8-12
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8-13
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