Samsung SCH-211 Service Manual page 39

Troubleshooting
6-1-2 Abnormal Initial Operation (Normal +3.3V voltage source)
Press PWR button.
applied to U401 pin 26?
TCXO/4 CLK signal output
from U401 pin 29?
RAM-CS signal output
from U127 pin 30?
CHIPX8 CLK signal output
from U401 pin 52?
Normal initial
display on LCD?
6-2
TCXO CLK
N
Y
N
Y
N
Y
N
Y
N
LED on?
Y
N
Y
END
Check TCXO output, R401, and C401.
Replace if required.
Check U401 and its neighboring
circuits. Replace if required.
Check MEM board, J103, and U101 pins
93-96, 98-105, 107-117, 119-126,
and 128-132. Replace if required.
Check 'H' level input from
U101 pin59 and U401 pin79.
Check the LED and its neighboring
circuits. Replace if required.
Check the LCD pins and its neighboring
circuits. Replace if required.
Samsung Electronics - Contents may change without notice.