4-13
4. Troubleshooting
4-1-6. No Video (Tuner DTV)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the DTV source.
Check the Tuner, Check the Chelsea.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check the D-TV source.
No
Yes
Does the DC B5V_VCCT_PW,
B1.25VT_PW, B3.3V_PW
appear at #3, #15, #12 Pin of Tuner?
No
Yes
Power indicator LED is off.
Lamp(Backlight) on, no video
Yes
Check the connection of RF cable
No
Input the RF cable properly.
Yes
Change the Main Assy
Yes
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Please, Contact Tech support
No
Check the ‘signal strength’
in Self Diagnosis menu
Strength is enough?
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
No
Check IC4010 (Saturn4)
Change the Main Assy
2
No
Check a set
in the ‘Stand-by mode’.
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LE26B450C4H
Page 4: ...4 Signal Flows Information ...
Page 5: ...4 Signal Flows Information ...
Page 6: ...4 Signal Flows Information ...
Page 7: ...4 Signal Flows Information ...
Page 8: ...4 Signal Flows Information ...
Page 9: ...4 Signal Flows Information ...
Page 13: ...4 Signal Flows Information DDR SIGNALS go into SEMS12 directly ...
Page 14: ...4 Signal Flows Information CI SIGNALS go into SEMS12 directly ...
Page 15: ...4 Signal Flows Information LVDS SIGNALS go into TCON BD directly ...
Page 50: ...1 4 1 Precautions Memo ...
Page 64: ...4 5 4 Troubleshooting LVDS PC_RGB HV_Sync MAINBOARD BOTTOM ...
Page 65: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 67: ...4 8 4 Troubleshooting HDMI 2 HDMI 1 MAINBOARD TOP ...
Page 68: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 70: ...4 11 4 Troubleshooting B3 3V_PW Tuner_CVBS B5V_VCCT_PW MAINBOARD TOP ...
Page 71: ...4 12 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 73: ...4 14 4 Troubleshooting TS_DATA B1 2V_PW B3 3V_PW B5V_VCCT_PW MAINBOARD TOP ...
Page 74: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 76: ...4 17 4 Troubleshooting MAINBOARD BOTTOM ...
Page 77: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 79: ...4 20 4 Troubleshooting MAINBOARD BOTTOM ...
Page 80: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 83: ...4 24 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...
Page 101: ...4 42 4 Troubleshooting 4 8 PCB diagram ...
Page 102: ...4 43 4 Troubleshooting ...
Page 103: ...6 1 6 Wiring Diagram 6 Wiring Diagram 6 1 Wiring Diagram 26 32 37 ...