Samsung SM-G350 TROUBLESHOOTING GUIDE
Level
8.
Block Diagram
8-1.
Repair
3
8-1
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Level3Repair
PCB Diagrams
8-2.
8-2-1.
Top
8-2-2.
Bottom
8-2
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Flow Chart of Troubleshooting
8-3.
Equipments
Level3Repair
Oscilloscope
Power Supply
Digital Multimeter
driver, ESD Safe Tweezer
+
8960 &
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Spectrum Analyzer
8-3
Soldering iron
Level3Repair
8-3-1.
Power On
Cell-phone can`t power on.
Check the Battery Voltage
it more than
Is
Check the Power Key Button
Power-on the phone and check
open, etc)
(
the power-on sound
Sound or vibration is ok?
Yes
No
Yes
3.4
V?
.
No
Abnormal
Yes
Charging the battery by TA.
Change the Power Key Button(TACT200)
And retry to the power-on operation.
Change the FRONT ASSY
Check the UCP300
output voltage
C307=1.1V, C327=1.1V)
(
Yes
Check the Clock OSC300
Is that frequency32KHz?
Yes
check the initial operation
Yes
END
No
No
If the output voltage is not satisfied with normal
condition, Change the UCP300
Change the OSC300
Test condition(Oscilloscope setting)
※
us.div(time division)
:20.0
8-4
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Level3Repair
8-5
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Level3Repair
8-3-2.
Initial(Lock up)
Initial Failure(Lock up when booting)
Re-download SW the phone.
Check the oscillator clock waveforms.
32.768
OSC300 is operating when
phone is not in sleep mode
Download success
KHz:OSC300(C381)
Normal
Change UCP300
Abnormal
No
Abnormal
If Phone do not go download mode, boot code area
of eMMC MCP is damaged.
It need to change the UME300(eMMC MCP)
Check the OSC300.
Crack, open etc.)
(
Check the output clock waveforms and frequency.
Test condition(Oscilloscope setting)
※
us.div(time division)
:20.0
@ 32.768
Khz
Change PBA
END
8-6
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Level3Repair
8-7
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Level3Repair
8-3-3.
Charging Part
TA/USB Insert
Charging Sequence Start
VBUS_5.0V_IF(C537)=5V
Battery is Charging?
Yes
Vin
=5V
Yes
Check the
Yes
Yes
No
No
No
Check CURRENT_TEST=5V,
or may not connected TA/USB
Resolder or Replace U506
Resolder or Replace U506
END
8-8
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Level3Repair
8-3-4.
Microphone Part
Check microphone function
in voice call speaker mode
or in voice recording mode
Check PCB where MIC is
placed
for any damage.
Check the voltage at
C421
Yes
Yes
=2.1V
No
No
Replace the MIC400 or PBA
Resolder or replace UCP300
Yes
Check component soldering
status of R303, R363, C385,
C386
Yes
END
No
Resolder the R303, R363, C385, C386
or Chane the PBA
8-9
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Level3Repair
8-10
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Level3Repair
8-3-5.
Speaker Part
Play MP3 with maximum volume level.
Check speaker function.
Yes
Check the connection of
MAIN PCB
ANT401, ANT403)
(
Yes
Replace the speaker
module
Yes
END
No
No
Replace the ANT401, ANT403
Replace the UCP300
8-11
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Level3Repair
8-3-6.
BT Part
BT is not working
Yes
Check BT function ON
Yes
Check the Voltage on
R204
Check
=3.3
C212
37.4
V, C214
=1.5V
Yes
MHz Clock at
C231
Yes
=1.2
No
V,
No
No
Check the OSC200(crack, open, etc.)
Enable BT Function
Check the U201
crack, open, damaged, etc.)
(
Check the Voltage on L201,
C202, C200, L208, L206,
Resolder or Replace U201
C223
Yes
Check the Status of
L203
Yes
Yes
END
No
No
Check the F200(crack, open, etc.)
Resolder or replace C202, C200, L208, L206,
L203
8-12
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