Samsung LW15N13WX Service Manual 09
CONFIDENTIAL
NK15A*/NK17A* 5-1
5 Troubleshooting
5-1 No Power
Does proper DC 14V appear at DC
jack connected to CN801?
Check SMPS PCB and Adapter.
Yes
No
No
No
No
No
Does proper DC 3.3V_A
appear at FT852?
Check IC801. (#2)
Yes
Does proper DC 2.5V_A
appear at Pin 3 of IC802?
Check IC802.
Yes
Does proper DC 3.3V_B
appear at FT822?
Check IC805. (#1)
Yes
Does proper DC 2.5V_B
appear at Pin 3 of IC806?
Check IC806.
WAVEFORMS
IC801 #2
1
IC805 #1
2
1
2
CONFIDENTIAL
5 Troubleshooting
5-2 NK15A*/NK17A*
5-2 No Video (PC Signal)
Power indicator is green.
Does the signal appear
at C306, C398, C397
of R, G, B input?
Check CN401 and cable.
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Does the clock pulse appear at
output of RA351 ~ RA356?
Check related circuit of IC350.
Does the clock pulse
appear at R354?
Check R354 and related
circuit of R354.
Does the clock pulse
appear at X201?
Check X201 and related
circuit of X201.
Does the clock pulse appear at
output of RA301~RA306?
Replace RA301 ~ RA306, IC300.
Replace LCD Panel.
WAVEFORMS
Full White R, G, B Input (C306, 398, 397)3X201
4
3
4
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