4-19
4. Troubleshooting
4-1-8. No Video (Component)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Component source
-
Check the chelsea.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Does the component data appear at
TP - COMP1_Y, COMP1_PB, COMP1_PR
(Comp / Y, Pb, Pr) ?
Does the digital data appear at
TP - , O_TXCLK- ?
Yes
Yes
Yes
Yes
Check a set in the 'Stand-by mode'
Input the component source properly.
Please, Contact Tech support.
Check CN701.
Change the Main Assy.
26" : BN94-03399B
22"/19" : BN94-03399C
Check IC301 (SX1)
Change the Main Assy.
26" : BN94-03399B
22"/19" : BN94-03399C
No
No
No
No
No
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the component source and
check the connection of component
cables(Y,Pb,Pr)?
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
5
2
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for UN19C4000PD
Page 7: ...1 4 1 Precautions Memo...
Page 34: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output...
Page 36: ...4 8 4 Troubleshooting Location Main TOP A BOTTOM B Detail A Pin 12 Pin 7 B O_TXCLK O_TXCLK...
Page 37: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output...
Page 39: ...4 11 4 Troubleshooting Location Main TOP BOTTOM B A Detail A B_5V TUNER_33V B O_TXCLK O_TXCLK...
Page 40: ...4 12 4 Troubleshooting WAVEFORMS 2 LVDS output...
Page 42: ...4 14 4 Troubleshooting Location Main TOP BOTTOM B A Detail A B_5V TUNER_33V B O_TXCLK O_TXCLK...
Page 43: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output...
Page 45: ...4 17 4 Troubleshooting Location Main TOP BOTTOM B A Detail A COMP1_Y B O_TXCLK O_TXCLK...
Page 46: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output...
Page 49: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output...
Page 52: ...4 24 4 Troubleshooting WAVEFORMS 7 Speaker out...