4-7
4. Troubleshooting
4-1-4. 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 MSD2248AL
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check TU5001
Change the main PCB assembly or tuner.
No
Yes
No
Yes
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF signal.
Check the connected cable.
Yes
Check IC3001
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the digital data appear at output
of R5006~R5020, R5022~R5029?
Does the digital data appear at output
of R3082F~R3095F?
No
Check IC4001
Change the main PCB assembly
8
6
7
Does the signal appear at TU5001?
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LN32A450C1D
Page 6: ...1 4 1 Precautions Memo ...
Page 18: ...3 6 3 Disassembly and Reassemble Memo ...
Page 22: ...4 4 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 30: ...4 12 4 Troubleshooting WAVEFORMS 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 50: ...4 32 4 Troubleshooting Memo ...
Page 107: ...6 4 6 Wiring Diagram Memo ...
Page 108: ...7 1 7 Schematic Diagram 7 Schematic Diagram 7 1 Internal Block Diagram of Scaler MSD2248AL ...
Page 109: ...7 2 7 Schematic Diagram 7 2 SCHEMATIC Block Diagram ...
Page 110: ...7 3 7 Schematic Diagram 7 3 SlimHalf Tuner Diagram ...
Page 111: ...7 4 7 Schematic Diagram 7 2 Schematic Diagrams 7 2 1 STANDBY ...
Page 112: ...7 5 7 Schematic Diagram 7 2 2 FUNCTION KEY 7 2 3 LCD OPTION ...
Page 113: ...7 6 7 Schematic Diagram 7 2 4 FBE ...
Page 114: ...7 7 7 Schematic Diagram 7 2 5 ATSC HALF NIM TUNER 7 2 6 DVI SOUND INPUT ...
Page 115: ...7 8 7 Schematic Diagram 7 2 7 HDMI INPUT ...
Page 116: ...7 9 7 Schematic Diagram 7 2 8 SIDE HDMI CONNECTOR 7 2 9 SOUND AMP ...
Page 117: ...7 10 7 Schematic Diagram Memo ...
