Samsung SM-A526B Service Manual page 24

8. Level 3 Repair
8-4-1. Power On
Check Battery voltage
Does Boot sound and
vibration motor work when
power on?
When pressing the Power key,
R6016 voltage is low?
Check voltage
TP_AP_PS_HOLD = 1.8V
Check clock of OSC6000
Check Power on
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No Power
YES
3.8V?
≥
YES
No
YES
YES
76.8MHz?
YES
YES
END
NO
Charge device with TA.
Swap battery if battery voltage is too
low (less than 3.0V)
Yes
Swap FRONT-LCD ASSY
NO
SWAP Power key FPCB
Check voltage of U6002
L6000 = 1.13V , L6002 = 1.904V , L6003
= 0.752V, L6004 = 0.8V , L6005 = 0.8V,
NO
L6006 = 0.952V
Swap U6002, if measured value is not
same with above.
※ Consider voltage margin ±10%
NO
Swap OSC6000(first) & U6008
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)