Samsung GT-S3370 Service Manual page 29

9. Flow Chart of Troubleshooting
9-1. Baseband
9-1-1. Power ON
'Power On' does not work
Check the current consumption
Yes
Current
consumption
>= 100mA
Yes
Check the VBAT Voltage
Voltage >=3.3V
Yes
Check the power
VREG_RF1_2.3V
VREG_RF2_1.4V
VREG_MSMC_1.2V
VREG_USIM_2.85V
VREG_TCXO_2.85V
VREG_RFTX2_1.3V
VREG_RFRX2_1.3V
VREG_RFA_2.2V
VREG_MSMP_2.6V
VREG_MSME_1.8V
VREG_GP1_2.85V
VREG_GP2_2.9V
Yes
Check the TCXO clock (TCX200)
Clock = 19.2 MHz
Yes
Check the OSC400
Clock = 32.768 kHz
Yes
END
No
Current
consumption
>= 30mA
Yes
Download again
No
Charge the Battery
No
Change the UCP300
No
Change the TCX200
No
Change the OSC400
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No
Check the pin3
of Q 400
Low
VPH_PWR
= VBAT
Yes
9-1
High
Check the UCP300
No
Change the Q 400