Power On Troubleshooting - LG lg530g Service Manual

4.7 Power ON Troubleshooting

Power On sequence is :
PWR key press -> KPDPWR_N (QSC6270 KPDPWR_N pin(AA10)) go to low(TP1) -> QSC6270 Power Up -> VREG_
MSMC_1.2V(TP2), VREG_RF1_2.3V(TP3), VREG_MSME_1.8V(TP4), VREG_MSMP_2.6V(TP5), VREG_RF2_1.4V(TP6), VREG_
TCXO_2.85V(TP7) power up and system reset assert to MSM -> Phone booting and PS_HOLD assert to PMIC
TP1 Battery voltage. higher
Change the main board
LGE Internal Use Only
START
than 3.20V?
Yes
TP1 go to low
when key press?
Yes
TP2~TP7
power up?
Yes
Is clock ok?
TP8 : 32.768KHz
TP9 : 19M
Yes
No
Change or charging the Battery
No
Check the Key Dome
No
Change the main board
No
Check the TCXO & Sleep Cystal
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4. TROUBLE SHOOTING
Only for training and service purposes