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BB Trouble Shooting
4.7 Power on trouble
Power on sequence of KS10 is :
PWR key press → KEY_ON_SW_N go to low (D405, PM6650-1M KPDPWR_N pin#24) → PM6650-
1M Power Up → VREG_MSMC_1.375V(C735), VREG_MSME_1.8V(C736),
VREG_MSMP_2.7V(C730), VREG_MSMA_2.6V(C726), VREG_TCXO_2.85V(C710) power up →
PON_RESET_N assert to MSM and PON assert to STn8810 → VDD_IO_2.7V(C304),
VDD_IO_1.8V(C311),AP_VCORE(C314),AP_VPLL(C328),AP_VFUSE(C329) power up -> CPU and
Phone booting & PS_HOLD(D700) assert High to PMIC(PM6650-1M)
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Only for training and service purposes
Start
Battery voltg. higher
than 3.22V?
YES
Press PWR key
Keypad LED on?
YES
VA100 high to low
when key press?
YES
YES
Is clock ok?
X100 : 19.2M
X600 : 32.768Khz
YES
Change the Main board
- 111 -
4. TROUBLE SHOOTING
NO
Change or charging the
Battery
NO
Follow the LED trouble
shoot
NO
Check open Pattern
of power button
NO
Change the Main board
NO
Check the TXCO
LGE Internal Use Only
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