Samsung i5500B Troubleshooting
Level
8.
Block Diagram
8-1.
Repair
3
8-1
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PCB Diagrams
8-2.
8-2-1.
Top
Level3Repair
8-2
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Level3Repair
8-2-1.
Bottom
8-3
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8-3.
8-3-1.
Level3Repair
LOGIC
Power On
Power switch on
NG
Check the current
consumption
>= 100
mA?
Yes
Check the battery
voltage
>= 3.45?
Yes
Check the TP_PS_
HOLD pin PS_HOL
D=2.6
V?
Yes
Check the clock at
OSC400
=32
KHz
NO
Download
NO
NO
Change the battery
Check the PMIC
relatedtoPS_HOLD
?
NO
Resolder OSC400
Yes
C443(VREG_MSMC1)=1.2V?
C442(VREG_MSMC2)=1.2V?
C441(VREG_MSME)=1.8V?
C411(VREG_MSMP)=2.6V?
C412(VREG_MSMA)=2.6V?
Yes
Check the clock
C109
=19.2
Mhz
?
Yes
Check the initial operation
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NO
Check the U401
NO
Check the clock generation circuit
8-4
Level3Repair
8-5
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Level3Repair
8-6
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Level3Repair
8-7
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Level3Repair
8-8
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Level3Repair
8-3-2.
LCD Working
Power Switch On
LCD Display
On?
Yes
NO
LCD FPCB
connector is co
rrectly connecti
ned?
Yes
F600, F601,
F602, F603,
F604, F605,
F606 Correctly
mounted?
correctly connect
NO
F600, F601, F602,
F603, F604, F605,
F606 Resolder
NO
Yes
LCD
Replace
Yes
C522
LED_P_26V=26V?
NO
Replace U503&Check
neighboring circuits
8-9
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Level3Repair
8-10
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Level3Repair
8-11
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Level3Repair
8-3-3.
TSP
Operate TSP
NG
Check
TSP Connecting
YES
Change TSP Module
No Problem?
NO
Reconnecting TSP
NO
Change main PBA
END
8-12
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Level3Repair
8-3-3.
z
Audio Working
Speaker Working
Operate speaker
NG
Check
Speaker
Soldering
YES
Speaker break
down?
NO
NO
Resolder
YES
Change Speaker
Signal on in
L502, L504?
NO
Signal on in
C407, C408?
NO
Change main PBA
YES
YES
Resolder
L502,L504
SPK ASSY
Resolder
C407, C408
Replace U500
8-13
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Level3Repair
8-14
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Level3Repair
8-15
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Receiver Working
z
Operate Receiver
NG
Level3Repair
Check
Receiver
Soldering
YES
Receiver break
down?
NO
Change main PBA
NO
Resolder
YES
Change Receiver
8-16
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Level3Repair
z
MainMICWorking
Operate MIC
NG
Pollute
MIC Hole?
NO
Check
C504=High?
YES
Change MIC
YES
NO
Clean up
MIC hole
Remove MIC,
Check MIC4th pin
MIC_BIAS_1.8V)
(
=1.8V?
YES
Change MIC
NO
Change main PBA
8-17
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