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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
Power ON Troubleshooting
5. Base band part
4.1 Power ON Troubleshooting
Power On sequence is :
PWR key press PM_ON_SW_N Î QSC6270 KPDPWR_N pin(AA2) go to low(Main BOARD R205) Î QSC6270
Power Up Î VREG_MSMC_1.2V(C261), VREG_MSME_1.8V(C209), VREG_MSMP_2.6V(C414),
VREG_RFRX2_1.3V(C232), VREG_TCXO_2.85V(C275) power up and system reset assert to QSC6270 Î Phone
booting and PS_HOLD assert to QSC6270
START
Battery voltage. higher
than 3.20V?
Change or charging the Battery
No
Yes
Change the main board
Replaced
with normal LCD module,
and then Booting is OK?
Go to LCD Troubleshooting
Yes
No
TP1_R205 go to low
When Power key press?
Check the Key Dome
No
Yes
TP2_VREG_MSMC_1.2V(L201)
TP3_VREG_RF1_2.3V(L202)
TP4_VREG_RF1_1.4V(L203)
power up?
Change the main board
No
Yes