Power On - Samsung SM-J710FN Service Manual

8. Level 3 Repair

8-4. 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?
Check the voltage level at
ANT6002 or R6015 while pressing
power key. Is the voltage high?
Check the signal of
PMIC_PWR_HOLD =
1.8V
Yes
Check the Clock OSC5000
Is the frequency 24Mhz?
check the initial operation
Yes
END
Confidential and proprietary-the contents in this service guide subject to change without prior notice
Distribution, transmission, or infringement of any content or data from this document without Samsung's written authorization is strictly prohibited.
No
Yes
No
Abnormal
Yes
No
No
Yes
www.AppleUnlockStore.com
Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),
Change the battery.
Change the FRONT-LCD ASSY
Replace the POWER KEY FPCB.
Check the output voltage of U5004
(L5002 = 0.8V, L5004 = 0.8V, L5003 = 0.8V, L5005 = 1.35V,
L5006 = 2.0V, C5006 = 1.8V and other LDO Voltage.)
If the output voltage is not normal, Change the U5004.
※ Each voltage level has ±10% margin.
Replace the OSC5000.