LG KS660 - Trouble Shooting; SIM error; No connection to the network; Calls not available

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4. TROUBLE SHOOTING
Replace U205
Replace main board
Replace U203
Re
p
lace Vibrator
Assemble
OK
Check the driver IC(U203) and LDO(205)
Check the vibrator
soldering


START
Pin6 of U205(B_EN) is
hi
g
h?
Pin3 of U205(VOUT) is
3.1V?

Yes
Check Vibrator sodering
Yes
V
IB_PWM Signa of
Q202 is OK?

Yes
No
Check VIB_OUT_N/P 
No
No