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