4-10
4. Troubleshooting
4-1-5. No Video (Tuner_CVBS)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Tuner CVBS source.
-
Check the Tuner, Check the Chelsea.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the RF source and
check the connection of RF cable?
Check the LVDS cable?
Check the T-Con B'd?
Does the digital data appear at
TP-, E_TXCLK- ,
, O_TXCLK-?
Does the DC B5V_TU_PW, TU33V_PW
appear at #3, #5 Pin of Tuner ?
Check a set in the 'Stand-by mode'.
Input the RF source properly.
Please, Contact Tech support.
Check IC1102 (SX1).
Change the Main Assy.
Change the Main Assy.
Yes
Yes
Yes
Yes
No
No
No
No
No
2
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LE26C45 Series
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 6 Speaker out ...
Page 66: ...4 41 4 Troubleshooting 4 9 3 Main Inner 2 4 9 4 Main Inner 3 ...
Page 67: ...4 42 4 Troubleshooting 4 9 5 Main Bottom ...
Page 68: ...4 43 4 Troubleshooting 4 9 6 Power_32 SMPS LC5XX 4 9 7 Power_37 SMPS LC5XX ...
Page 69: ...4 44 4 Troubleshooting 4 9 8 Power_40 SMPS LC5XX 4 9 9 Power_46 SMPS LC5XX ...
Page 70: ...4 45 4 Troubleshooting 4 9 10 Power_26 SMPS LC45X 4 9 11 Power_32 SMPS LC45X ...