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5-1-2 Abnormal initial operation (Normal +2.8V voltage source)
Press PWR Key
TCXO CLK
applied to U140 pin2
TCXO CLK
signal outputted from
U140 pin4?
RAM_CS signal
outputted from U100
pin P14,N4?
CHIP X8 CLK
signal outputted from
U100 pin A14?
LED on?
Normal initial
display on LCD?
END
5-2
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
Check VCTCXO Output.
Check U140 and its neighboring
circuits. Replace if required.
Check MSM board U100
Check MSM board U100
Check the LED and its neighboring
circuits. Replace if required.
Check the LCD pins and its neighboring
circuits. Replace if required.
Trouble shooting
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