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Maintenance & Troubleshooting
A
Y
Unplug CN6 in
Replace OPE b'd
+5 V ?
the scan board
and LCD module
N
Replace the main b'd
7-4-3 System Not Initialized
Check system clock
Check CPU-RSTO
Y
(pin 50 of U18) in
Start
(pin 67 of U18) in
Logic 'H' ?
the main board
the main board
N
N
19.6608 MHz ?
Check Vcc (+5 V)
Y
from P1-16 to P1-18
Replace the OPE
board
Replace power
N
Vcc ≥ 4.5V ?
Replace the main b'd
supply
Y
Replace the main
board
END
Samsung Electronics
7-7
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