Samsung Galaxy Grand 2, Руководство по ремонту

Страница: 42 / 69

Service Excellence Beyond Imagination
SWA-CS Content Innovation
Power problem
Step Check point Result value Defect point
1 Confirm the defect symptom - -
2 Check the power with a new battery
Solved Battery
Not solved Go to the next step
3
Check the PBA current with a power supply
(power supply voltage : 3.8 ~ 4.0V)
High current (over than 1A) Circuit short
Low current S/W download
Normal current Display or Power key
No current (almost 0mA) Go to the next step
4 Check the V
batt
(+point) of battery contact
C425 = 3.8V
(same as power supply voltage)
Go to the next step
If not the correct value PMIC (U401)
5
Check the voltage of following chips
(C561,C558,C556,C559,TP(AP_PS_HOLD))
C484,C485 = 1.15V
C466 = 1.3V
C467 = 2.1V
R420 (MSM_PS_HOLD) > 1.8V
Go to the next step
If not the correct value PMIC (U401)
6 Check the frequency of OSC400
19.2MHz Main chip (UCP300)
If not the correct value X-tal (OSC400)