LG GW620 - Power on Troubleshooting

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4. TROUBLE SHOOTING
4.10 Power ON Troubleshooting
Start
Battery voltage. higher
than 3.70V(OCV)?
TP1 high to low
when key press?
TP2 (1.2V), TP3(1.2V),
TP4(1.8V), TP5 (2.6V), TP6(2.6V),
TP7(2.85V) power up
currently?
Is clock ok?
TP8 : 19.2M
TP9 : 32.768Khz
Change or charging the
Battery
1. Check correctly working
power key
Change the Main board
Change the Main board
NO
YES
YES
YES
YES
NO
NO
NO
Power On sequence of GW620 is :
Power key press Æ KPD_PWR_N(VA20) go to lowÆ PM7540 Power Up Æ VREG_MSMC1_1.2V(C104),
VREG_MSMC2_1.2V(C107), VREG_MSME_1.8V(C161), VREG_MSMP_2.7V(C106), VREG_MSMA_2.6V(C109),
VREG_TCXO_2.85V(C218) power ON Æ Phone booting and PS_HOLD(D18) go to High
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