Samsung SCH-A105 Service Manual page 31

6-1-2 Abnormal Initial Operation (Normal +3.3V source)
Press
END/
TCXO CLK
applied to U401 pin 36&
U501 pin35?
TCXO CLK signal output
from U401 pin 37?
CHIPX8 CLK signal output
from U401 pin 38?
LED ON?
Normal initial
display on LCD?
button
Yes
Yes
Yes
Yes
Yes
END
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Check TCXO output,
R310 and C325.
No
Replace if required.
Check U401 and its meighboring
No
circuit. Replace if required.
Check 'H' level input from
No
U101 pin P6 and U401 pin79.
Check the LED and its neighboring
No
circuit. Replace if required.
Check the LCD pins and its
neighboring circuit.
No
Replace if required.
6-2
Troubleshooting