LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4. BB Trouble Shooting
4.6 Power ON Troubleshooting
Power On sequence of CU575 is :
PWR key press(Key PCB)
→
PM_ON_SW_N go to low(D603), PM6650 KPDPWR_N pin(24)
→
PM6650 Power Up
→
VREG_MSMC_1.25V(C733), VREG_MSME_1.8V(C734),
VREG_MSMP_2.8V(C721), VREG_MSMA_2.6V(C719), VREG_TCXO_2.85V(C714) power up
and system reset assert to MSM
→
Phone booting and PS_HOLD(D701) assert to PMIC
Start
Battery voltage is
higher than 3.25V?
Signal of D603 is low
When key is pressed?
VREG_MSMC_1.25V,VREG_MSMP_2.8V
VREG_MSME_1.8V, VREG_TCXO_2.85V,
VREG_MSMA_2.6V power up?
Is clock ok?
C56 : 19.2M
TP701 : 32.768Khz
Change the main board
Change or charging the
Battery
Check the Key Dome
Change the main board
Check the TXCO(X702)
NO
YES
YES
YES
YES
NO
NO
NO
Содержание CU575
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