Samsung E2370 Troubleshooting
Level
32-bit ARM926EJ
STMcontrol processor
Analog accessory detection
Memory
1.77 128x160
(VGA)
8.
Block Diagram
8-1.
Keypad
Motor
SIM
OVP
Battery
Repair
3
PNX4852
GSM/GPRS Class 10 single chip
SAIC/TTY/CTM
Integrated DCXO and AFC correction
I2C/UART/PCM/PWM/USB charge/OVP
Bluetooth/FM support
SIM card interface, Dual SIM supported
Color LCD, 1.77” QQVGA
Three clock outputs(32kHz.,26MHz,26/nMHz)
Up to 42 GPIOs(1.8V/2.8V)
78MHz burst memory access
RF Subsystem
RF System
Bluetooth
(SPI)
FM
IF Connector
(20 Pin)
Camera
PMU
Backend IC
LCD
"
QQVGA ,TFT
SD Card
Audio Subsystem
SPK
EAR SPK
MIC
Ear MIC
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. Vbatt=C108, C109, C212,C308)using Oscilloscope
-
look over the coming out signal.
-
GND
Oscilloscope
←
TP(Test Point)
8-4
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Multi-meter
←
Level3Repair
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
Level3Repair
8-3-1.
Power On
Power On'does not work
'
Check the Battery Voltage
is more than
TP:C110,C229,C207,C234)
(
Check the Clock at
OSC
CLK32K)
(
TP:OSC200
(
Yes
Yes
200 1,4
=32
Yes
KHZ
1,4
3.7V
pin
pin)
No
No
Change the Battery
Because of batt. power low)
(
Resolder OSC200
Check the Clock at
UCP200(CLK32K)
TP:TP_32K)
(
Yes
VCORE
_1.25V
V?
=1.25
TP:C212,204)
(
Yes
END
=32
KHZ
No
No
Check the Main Chip
to lookover the Chip damage)
(
TP_32K/look over the waverform
(TP:
using the oscilloscope)
Resolder L202&Replace UCP200
to confirm coming out power V_core)
(
8-6
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8-7
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8-3-2.
Initial
Initial Failure
Yes
UCP200 pin T4(RSTON)
="H(>2.8V)"?
R212)
using the oscilloscope GND&TP
(TP:
Yes
CP200pin M4 or D12=
U
"H(>2.8V)"?
TP:C222,JTAG4pin)
(
No
No
Replace UCP200, must be"H"
usingaHeatgun
Change PBA to check C222&JTAG4pin
Yes
Check the16bit data signal
memory CE(TP:U201)
&
Yes
END
8-8
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8-9
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8-3-3.
Charging Part
UCP200 pin V10(VCHG_5V)
UCP200 pin V9(AUX_DET
Abnormal charging part
Yes
>4.9V
TP:C228)
(
Yes
"L=2.8V"?
Yes
No
)
No
Check the
be possible that it's not soldering well)
(
Check the10pin of IFC100
be possible that it's not soldering well)
(
18,19,20
pin of IFC100
UCP200 pin R10,W10
L=HIGH
Check the TR200
it be possible the problem
(
?
Yes
things)
Yes
END
No
because of be possible for charging
(
No
Replace UCP200
block to get damaged)
Relpace TR200
8-10
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8-11
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