Power On - Samsung SM-A510FD Service Manual

8. Level 3 Repair

8-4-1. Power On

Mobile phone does not power on.
Check the Battery
Voltage.
Is it more than 3.8V?
Yes
Power-on the phone and
check the power-on sound
or motor Vibration.
Sound or Vibration is ok?
No
Check the voltage level at
ANT5007 while pressing power
key. Is the voltage high?
Yes
Check the signal of
PWR_HOLD = 1.8V
Yes
Check the Clock OSC2000
Is the frequency 26Mhz?
Yes
check the initial operation
Yes
END
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Charging the battery by TA.
No
If its voltage level is extremely low(under 3.0V),
Change the battery.
Yes
Change the FRONT-LCD ASSY
http://www.easy-firmware.com
Abnormal
Replace the POWER KEY FPCB.
No
Replace the PMIC
Replace the OSC2000.
No
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)