LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.6 Power on trouble
Power on sequence of KE990 is :
PWR key press
→
PM_ON_SW_N go to low (VA700, PM6635-2M KPDPWR_N pin#24)
→
PM6635-2M Power Up
→
VREG_MSMC_1.2V(C560), VREG_MSME_1.8V(R520),
VREG_MSMP_2.7V(R513), VREG_MSMA_2.6V(R508), VREG_TCXO_2.85V(C510) power
up
→
PON_RESET_N assert to MSM
→
Phone booting & PS_HOLD(D500) assert High to
PMIC(PM6635-2M)
4. TROUBLE SHOOTING
- 94 -
Start
Battery vo lt g. higher
than 3 .2V?
Press PW R key
Key pad L ED on?
VA700 h igh to low
when key press?
VREG_MSMC_1.2V,
VREG_MSMP_2.7V, VREG_MSME
_1.8V
VREG_TCXO_2.85V,
VR
Power up?
EG_MSMA_2.6V
Is c lock ok ?
X100 : 19.2M
X500 : 32.768Khz
Chang e th e Main board
Change or charging the
Batt ery
Follow the LED trouble
shoot
Check open Pattern
of power button
Check Dome Sheet
Chang e the Main board
Check the TXCO and SLEEP CRYSTAL
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
Содержание KE990 - Viewty Cell Phone 100 MB
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