Maintenance & Troubleshooting
Samsung Electronics
7-6
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7-4-2 Malfunction of LCD Display
START
END
Power cord
connected?
Fuse OK ?
+5 V ?
+5 V ?
OK ?
Normal?
A
END
Fuse remain
good ?
Check AC voltage
220 VAC?
Notify customer
Connect as
required
1. Unplug machine
2. Check fuse
1. Replace fuse
2. Plug in machine
Check power
supply voltage
Measure voltage on
the scan b'd (CN7-1)
Measure on the
OPE b'd (CN1-1)
Replace harness
Check harness
Replace OPE b'd
and LCD module
Check harness
Replace harness
Replace power
supply