Samsung SM-A205FN Service Manual page 99

8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Check the Battery Voltage.
Is it more than 3.5V?
Power-on the phone and check
the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Check the voltage level at
R5025 while pressing power
key. If the voltage high?
Check the signal of PWRHOLD
(U7034) = 1.8V
Check the Clock OSC5000
Is the frequency 19.2MHz?
Check the initial operation
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Yes
Yes
No
Yes
Yes
Yes
Yes
END
Charging the battery by TA.
No
If its voltage level is extremely low
Yes
Change the FRONT ASSY
No
Replace the Power key FPCB
Check the output voltage of U5002
(C5042 ,C5039,C5041, C5047, C5052,C5074= 0.8V
C5060=1.1V and C5063=1.3V C5044=2.0V and
No
other LDO Voltage.)
If the output voltage is not normal, Change the
U5002.
※ Each voltage level has ±10% margin.
No
Replace the OSC5000
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
(under 3.0V),
Change the battery.