4-16
4. Troubleshooting
4-1-7. No Video (Video CVBS)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Video CVBS source
-
Check the Main Chipset.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Does the CVBS data appear at
TP - AV_CVBS ?
Does the digital data appear at
TP - , O_TXCLK- ?
Yes
Yes
Yes
Yes
Check a set in the 'Stand-by mode'
Input the video source properly.
Please, Contact Tech support.
Check CN801.
Change the Main Assy.
Check IC1102 (SX1).
Change the Main Assy.
No
No
No
No
No
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the video source and
check the connection of video cable?
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
2
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for UE19C4000PW
Page 7: ...Memo 1 4 1 Precautions...
Page 28: ...4 3 4 Troubleshooting...
Page 30: ...4 5 4 Troubleshooting...
Page 31: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output...
Page 33: ...4 8 4 Troubleshooting...
Page 34: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output...
Page 36: ...4 11 4 Troubleshooting...
Page 37: ...4 12 4 Troubleshooting WAVEFORMS 2 LVDS output...
Page 39: ...4 14 4 Troubleshooting...
Page 40: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output...
Page 42: ...4 17 4 Troubleshooting...
Page 43: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output...
Page 45: ...4 20 4 Troubleshooting...
Page 46: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output...
Page 48: ...4 23 4 Troubleshooting...
Page 49: ...4 24 4 Troubleshooting WAVEFORMS 7 Speaker out...
Page 63: ...4 38 4 Troubleshooting 4 8 PCB diagram PCB layout_ TRIDENT SX1 PCB layout_ MSTAR X4...
Page 64: ...4 39 4 Troubleshooting Main TOP_TRIDENT SX1 Main TOP_MSTAR X4...
Page 65: ...4 40 4 Troubleshooting Main Inner 2 _TRIDENT SX1 Main Inner 2 _MSTAR X4...
Page 66: ...4 41 4 Troubleshooting Main Inner 3 _TRIDENT SX1 Main Inner 3 _MSTAR X4...
Page 67: ...4 42 4 Troubleshooting Main Bottom_TRIDENT SX1 Main Bottom_MSTAR X4...
Page 68: ...4 43 4 Troubleshooting Power_19 SMPS Power_22 SMPS...