SAMSUNG Proprietary-Contents may change without notice
6-2
Troubleshooting
6-1-2 Abnormal Initial Operation (3.3V source)
TCXO CLK
applied to U401 pin 26?
Check TCXO output,
R400 and C400.
Replace if required.
Check U401 and its meighboring
circuit. Replace if required.
Check U109, MSM and its
neighboring circuits.
Check ‘H’ level input from J104
pin 17 to U401 pin 79.
replace if required.
Check Q125 and its neighboring
circuit. Replace if required.
Check the LCD pins and its
neighboring circuit.
Replace if required.
TCXO CLK signal output
from U401 pin 29?
RAM-CS signal output
from U109 pin 44?
CHIPX8 CLK signal output
from U401 pin 52?
Alert LED ON?
Normal initial
display on LCD?
END
Yes
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
No
Press button
END/