Troubleshooting - Samsung NK15N Series Service Manual

5 Troubleshooting

5-1 No Power
Does proper DC 14V appear at DC
jack connected to CN801?
Yes
Does proper DC 3.3V_A
appear at FT852?
Yes
Does proper DC 2.5V_A
appear at Pin 3 of IC802?
Yes
Does proper DC 3.3V_B
appear at FT822?
Yes
Does proper DC 2.5V_B
appear at Pin 4 of IC806?
Yes
Check IC812.
NK15N*/NK17N*
No
Check SMPS PCB and Adapter.
No
Check IC811.
No
Check IC802.
No
Check IC805.
No
Check IC806.
CONFIDENTIAL
WAVEFORMS
IC811 #2
1
IC805 #1
2
3
IC812 #2
5-1