Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LW15N13WX LW17N13WX_XEC.0000042107.E.09
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CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 14V appear at DC No
Check SMPS PCB and Adapter.
jack connected to CN801?
Yes
Does proper DC 3.3V_A No
1 Check IC801. (#2)
appear at FT852?
Yes
Does proper DC 2.5V_A No
Check IC802.
appear at Pin 3 of IC802?
Yes
Does proper DC 3.3V_B No
2 Check IC805. (#1)
appear at FT822?
Yes
Does proper DC 2.5V_B No
Check IC806.
appear at Pin 3 of IC806?
WAVEFORMS
1 IC801 #2 2 IC805 #1
NK15A*/NK17A* 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Signal)
Power indicator is green.
Yes
Does the signal appear No
3 at C306, C398, C397 Check CN401 and cable.
of R, G, B input?
Yes
Does the clock pulse appear at No
Check related circuit of IC350.
output of RA351 ~ RA356?
Yes
Does the clock pulse No Check R354 and related
appear at R354? circuit of R354.
Yes
Does the clock pulse No Check X201 and related
4
appear at X201? circuit of X201.
Yes
Does the clock pulse appear at No
Replace RA301 ~ RA306, IC300.
output of RA301~RA306?
Yes
Replace LCD Panel.
WAVEFORMS
3 Full White R, G, B Input (C306, 398, 397) 4 X201
5-2 NK15A*/NK17A*
5 Troubleshooting
CONFIDENTIAL
5-3 No Picture (TV, Video, S-Video, SCART)
Check the CO44, CO45(S-Video),
CO46(VCR) and CO42(RF-CVBS). No Check the CN888(Tuner)
5-1 IC011 #1 RF-CVBS
and the CN702_1.
5-2 IC011 #5 S-Video
5-3 IC011 #8 VCR
Yes
No Check the #19 and
6 Does the signal appear at IC010.
related circuit of IC011.
Yes
No Check the IC010 (#31~34,
Does the signal appear at
7 37~44, 47~50) Data out
IC200 and 3.3V_BA.
and related circuit of IC010.
Yes
Does the signal appear at No Check the IC200 and
IC300 and 3.3V_BD. related circuit of IC200.
Yes
Check the IC901 and CN901.
NK15A*/NK17A* 5-3
5 Troubleshooting
CONFIDENTIAL
WAVEFORMS
5-1 IC011 #1 RF-CVBS 5-2 IC011 #5 S-Video 5-3 IC011 #8 VCR
6 IC011 #19 7 IC010 Data Out
5-4 NK15A*/NK17A*
5 Troubleshooting
CONFIDENTIAL
5-4 No Sound
Does the signal appear at
Pin 67 (Tuner sound signal) and Pin
47, 48 (PC sound) and Pin 56, 57 No Check the CN403 (PC conector) and the
(SCART1 sound) and Pin 53, 54 CN402 (CN001) and the CN200 (CN002)
(SCART2) Pin 50, 51 (VCR) of and the CN888 (Tuner) and the CN702_1.
IC 919 (MSP3451)?
Yes
Does the signal appear at Pin 27, No Check the IC919 and
28 of IC919 (MSP3451)? related circuit of IC919.
Yes
Does the signal appear No Check the IC501 (Audio amp) and
at L501 ~L504? related circuit of IC501.
Yes
Replace the speaker.
NK15A*/NK17A* 5-5
5 Troubleshooting
CONFIDENTIAL
Memo
5-6 NK15A*/NK17A*
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