LG C1150 Service Manual page 66

Checking Flow
START
Check
Battery Voltage > 3.35
YES
Push power-on key and check
the level change of U102 KEYON
YES
YES
Check the voltage of
the following port at U102
VOORE=1.8V ?
VMEM = 1.8 or 2.8V ?
VEXT=2.8V ?
VRTC=1.8V ?
VSIM=2.85V ?
VMIC=2.5V ?
VVCXO=2.75V ?
YE
S
Logic level at KEYON of U102
= HIGH?
YES
Does it work properly?
The power- on procedure is com plet ed.
The pro blem may be elsewher e.
YES
THE PHONE WILL
POWER ON
Charge or C hange B attery and t ry again.
No
No Check the contact of power-key or d ome swi tch.
No
Repl ace U102
No Redow nload sof tware & try again.
No Does it work properly?
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4. TROUBLE SHOOTING
No
Repl ace the m ain board.
YES