Samsung S5260 Block Diagram 7
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.
presetting methods for checking TP
※
GND&TP(exp. VBAT=
-
look over the coming out signal.
-
C302
,
C303
using Oscilloscope
)
Oscilloscope
←
GND
TP(Test Point)
8-4
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Multi-meter
←
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EX) to look up the TP, shunt Cap.
-
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Checking the TP(test point) using Multi-meter
←
if checking the GND, you can listen"beep"
-
if checking the Signal, you can't listen it.
8-5
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LOGIC
8-3.
8-3-1.
Power On
Power switch on
NG
Check the current
consumption
>= 100
mA?
Yes
Check the battery
voltage
>= 3.45?
Yes
Check the clock at
OSC300
=32
kHz
Yes
C220(1.28V_VCORE)=1.28V?
C211(3.0V_DIG)=3.0V?
C214(1.8V_MEM)=1.8V?
C221(2.7V_VRF)=2.7?
C224(1.3V_VRF)=1.3V?
C208(1.3V_VCXO)=1.3V?
NO
Download
NO
Change the battery
NO
?
Resolder OSC300
NO
Check the U300
Yes
Check the clock
MHz
26
?
Yes
Check the initial operation
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NO
Check the clock generation circuit
OSC200
8-6
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8-7
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8-8
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8-3-2.
LCD Working
Power Switch On
LCD Display
On?
Yes
NO
LCD FPCB
connector is co
rrectly connecti
ned?
Yes
F400, F401,
F402, HDC400
Correctly moun
ted?
NO
NO
correctly connect
F400, F401,
F402, HDC400
Resolder
Yes
LCD
Replace
Yes
C421
LED_P_24V=24V?
NO
Replace U402&Check
neighboring circuits
8-9
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8-10
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8-11
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8-12
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