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4-7
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS) (SX1)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Tuner CVBS source
-
Check the M-star
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
No
Check a B+ voltage (IC801 DRXK IC)
3.3V,1.25V.
Change a main PCB ass’y.
No
No
Power Indicator is off.
Lamp on, no picure.
Yes
Change a main PCB ass’y.
Does the signal appeat #43 of IC801?
(DRXK 43PIN CVBS_TP)
Does the Signal appear at
R505 of IC1102?
Check the LVDS cable?
Replace the LCD panel?
Please, Call to Samsung Co. LTD.
Yes
Connect the RF cable and
check RF signal.
Yes
Yes
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LA22C450E1
Page 34: ...1 4 1 Precautions Memo ...
Page 51: ...4 4 4 Troubleshooting WAVEFORMS 12 PC input V sink H sink R G B 3 LVDS output ...
Page 53: ...4 6 4 Troubleshooting WAVEFORMS 1 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 55: ...4 8 4 Troubleshooting WAVEFORMS 1 CVBS OUT Grey Bar 2 LVDS output ...
Page 57: ...4 10 4 Troubleshooting WAVEFORMS 1 LVDS output ...
Page 59: ...4 12 4 Troubleshooting WAVEFORMS 1 I2S Data 2 Speaker out ...
Page 63: ...4 16 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 65: ...4 18 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 67: ...4 20 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 69: ...4 22 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 71: ...4 24 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 73: ...4 26 4 Troubleshooting WAVEFORMS 7 Speaker out ...