4-4
4. Troubleshooting
4-1-3. No Video (Analog PC signal)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the PC source
Check the Arsenal, Check the Chelsea.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check CN5001, PC cable.
Change the Main Assy
No
Yes
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
No
Yes
Power indicator LED is off.
Lamp(Backlight) on, no video
Yes
Check the PC source and
check the connection of D-SUB
No
Input the analog
PC signal properly.
Yes
Check IC4010 (Saturn4)
Change the Main Assy
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Please, Contact Tech support.
No
Does the signal appear at TP5002,
5003, 5004, 5006, 5008?
1
2
No
Check a set
in the ‘Stand-by mode’ or
‘DPMS 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 ...