Samsung SGH-i9000B Troubleshooting
Level
8.
Block Diagram
8-1.
Repair
3
8-1
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PCB Diagrams
8-2.
8-2-1.
Top
8-2
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8-2-1.
Bottom
8-3
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Flow Chart of Troubleshooting
8-3.
Equipments
Power Supply
↑
Oscilloscope
↑
Digital Multimeter
↑
driver, Tweezer
+
↑
8-4
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8-3-1.
Power On
Power On'does not work
'
Yes
check the current consumption
Yes
check current consumption
Check the Battery Voltage
is more than
>=100
mA
Yes
Yes
3.3V
No
No
Download again
Change the Battery
Because of batt. power low)
(
Check U503(PMIC) and
Power on voltage
C518
(
C520>1.8V, C522,>
check the initial operation
V, C519
>1.2
>1.8
Check the Clock at
OSC501 that
Frequency is
END
V)
Yes
Yes
Yes
1.2V
32K
>1.1
V,
C529
Check the problem point(short, open, crack
No
No
and If PMIC has problem, change U503
Check the clock generation circuit
(
etc)
related to OSC501)
8-5
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8-6
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8-3-2.
Initial
Initial Failure
Yes
The pin
swing properly
The pin
swing properly
AP_PS_HOLD(TP501) and
AP_N_RST_IN(R507)
low→High"?
"
There is
32.768
at OSC200 and OSC501
of U206
#1,2
1.8V
of U206=
#11,12
2.8V
Yes
Yes
KHz wave forms
Yes
=
and0V?
and0V?
=
No
check U206 and UCP400 and related parts(short,
No
if U503 has some problem, it is to be replaced)
(
No
Check U503(crack, open, etc)
Replace OSC
crack, etc)
200
and OSC501
R233
There are24MHz wave forms at
OSC400 and26MHz wave forms
at OSC100(C128)
LCD display OK?
Sound is OK?
>= 1.8
END
V?
Yes
Yes
Yes
Yes
No
No
No
No
Check UCP200 and related parts(short, crack,
Replace OSC
Check the LCD part(short, crack, etc)
Check the Audio Part(short, crack, etc)
etc)
and OSC100
400
8-7
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8-8
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8-3-3.
Charging Part
Check IFC300 pin#1whether
voltage reading is greater than
Check U503 DCIN whether
Abnormal charging part
Yes
4.9V
Yes
is measured
C502)
(
Yes
5V
No
No
Check the TA
TA may not be connected properly)
(
Resolder or Replace U301
Battery is charging?
Yes
END
No
Apply Heat over or Replace U503 using
Heatgun
a
8-9
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8-10
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8-3-4.
Sim Part
NO SIM
Yes
Check the connection of
the HEA301
Yes
Check the Sub PCB
Yes
END
No
Reconnect the Sub PCB
8-11
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8-3-5.
Microphone Part
Check main microphone function
in voice call receiver mode
Yes
Check the voltage at C267
Check component soldering
statuses of C281, C282
2.8V
Yes
Yes
=
No
No
Resolder or replace U210
Resolder or replace C281, C282
Resolder or change the Sub-
Touch Module
Yes
END
8-12
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8-13
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8-3-6.
Speaker Part
Play MP3 with maximum volume level.
Check speaker function.
Yes
Check signals on L209,
L210
Yes
No
Yes
Resolder or replace U207
Check signals on
L209, L210 again
No
Check the connection of
HEA301
Yes
Replace the speaker
module
Yes
END
No
Resolder or replace UCP400
Reconnect HEA301
8-14
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8-15
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8-3-7.
Receiver Part
Check receiver function in voice call receiver
mode
Yes
Check the signals at ZD307,
Check the signals at ZD307,
Check the connection of
ZD308
Yes
ZD308 again
Yes
HDC302
No
No
No
Resolder or replace U207
Resolder or replace UCP200
Reconnect HDC302
Yes
Replace the Receiver-Earjack
Ass'y
Yes
END
8-16
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