LG P705 - Power on Trouble Shooting

4. TROUBLE SHOOTING
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Only for training and service purposes
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4.10 Power ON Trouble Shooting
Power On sequence of P705 is :
Power key press -> KPD_PWR_N go to low -> PM8029 Power Up -> VREG_MSMC1_1.1V (L500),
VREG_MSMC2_1.1V (L501), VREG_MSME_1.8V (L502), VREG_P3_2.85V (C541), VREG_MSMA1_2.6V (C536),
VREG_MSMA2_1.2V (C532) VREG_TCXO_2.85V (C537) power ON -> Phone booting and PS_HOLD(D502) go
to High
START
Change or charging the Battery
No
Yes
Redownload SW image
Check correctly working power key
No
Yes
Change the Main board
No
Yes
Change the Main board
No
Yes
Battery voltage higher than 3.70V(OCV)?
TP503 high to low when key press?
Check below power output
(VREG_MSMC1_1.1V)
(VREG_MSMC2_1.1V)
(VREG_MSME_1.8V)
(VREG_P3_2.85V)
(VREG_MSMA1_2.6V)
(VREG_MSMA2_1.2V)
(VREG_TCXO_2.85V)
Is clock ok?
TP2 (X200) : 19.2M