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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.9 Power ON Troubleshooting
Power On sequence of KU380 is :
PWR key press
→
PM_ON_SW_N go to low, PM6650 KPDPWR_N (pin24)
→
PM6650 Power Up
→
VREG_MSMC_1.2V, VREG_MSME_1.8V, VREG_MSMP_2.7V, VREG_MSMA_2.6V,
VREG_TCXO_2.85V power up and system reset assert to MSM6245
→
Phone booting and
PS_HOLD assert to PMIC
Start
Battery voltage. higher
than 3.20V?
Key press?
VREG_MSMC_1.2V,VREG_MSMP_2.7V,
VREG_MSME_1.8V, VREG_TCXO_2.85V,
VREG_MSMA_2.6V power up?
Is clock ok?
R306 : 19.2M
X300 : 32.768Khz
Change the Main board
Change or charging the
Battery
Check the Key Dome
Change the Main board
Check the TXCO
NO
YES
YES
YES
YES
NO
NO
NO
Summary of Contents for Vodafone KU380
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