Samsung SCH-811 Service Manual page 31

6-1-2 Abnormal Initial Operation (Normal +3.3V source)
Press END button
applied to U401 pin 26?
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?
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TCXO CLK
Yes
Yes
Yes
Yes
Yes
Yes
END
Check TCXO output,
No
Replace if required.
Check U401 and its meighboring
No
circuit. Replace if required.
Check U109, MSM and its
No
neighboring circuits.
Check 'H' level input from J104
pin 17 to U401 pin 79.
No
replace if required.
Check Q125 and its neighboring
No
circuit. Replace if required.
Check the LCD pins and its
No neighboring circuit.
Replace if required.
R400 and C400.
6-2