Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV LE19R71W 09_Troubleshooting
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>> Download 09_Troubleshooting documenatation <<Text preview - extract from the document 4 Troubleshooting
4 Troubleshooting
4-1 No Power
Does DC 13V, 5V No
appear at CN400? Check Inverter/Adaptor Board
Yes
Does DC 3.3V No Check circuits related
Appear at FT412? to IC405.
Yes
Does DC 3.3V No Check circuits related to
Appear at FT414? IC407.
Yes
Check IC701(VCTi), IC703,
and IC301(SE6181LA)
4-1
4 Troubleshooting
4-2 No Picture (PC)
Power Indicator is black.
Does a signla appear at
C106, C107 and C108 No
1 (R,G,B Input?) Does a signla Check circutis related CN100.
appear at C106, C107 and C108
(R,G,B Input?
Yes
Does a signal appear at
No
2 3 Check circuits related CN100.
R113 and R115(H/V Sync)?
Yes
Does a signal appear at
No
4 Check circuits related IC301.
1~30 of CN300(LVDS out)?
Yes
Replace LCD PANEL.
4-2
4 Troubleshooting
WAVEFORMS
1 2
3 4
4-3
4 Troubleshooting
4-3 No Picture (TV)
Does a signal appear at No
Check TU200(TUNER).
5 PIN 2 of FT700 (X6965)?
Yes
Does a signal appear at
No Check the circuits related to
PIN71,72,73,74,75,78,79,80
IC701.
of IC701? 6
Yes
Does a signal appear at No
Check IC301.
4 PIN 1~30 of CN300?
Yes
Replace LCD Panel.
4-4
4 Troubleshooting
WAVEFORMS
4 5
6
4-5
4 Troubleshooting
4-4 No Picture (Video/S-VIDEO)
Power Indicator is off.
Lamp on, no picture.
Dose the signal appear at No Check a A/V cable and
R717,R718,R719 video signal.
Yes
Does the signal appear at No
Check a connection harness.
5 PIN(71:80) of IC702?
Yes
Does the digital data
No Check a IC702.
appear at output of LVDS
Change a main PCB ass'y.
4 (RA301~RA303)?
Yes
Check a LVDS cable? No Check a IC301.
Replace lcd panel? Change a main PCB ass'y.
4-6
4 Troubleshooting
WAVEFORMS
4 5
4-7
4 Troubleshooting
4-5 No Sound (TV)
Does a signal appear at
No
5 PIN 1,2 of FT700 Check Tuner.
(X6965M)?
Yes
Does a signal appear at No Check the circuits relevant
7 R538 and R542? to IC701.
Yes
Does a signal appear at No Check the circuits relevant
PIN 2,5,9,16 of IC502
to IC502.
(SL/SR OUT)?
Yes
Check the Speaker L/R.
4-8
4 Troubleshooting
WAVEFORMS
5 7
4-9
4 Troubleshooting
Memo
4-10
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