4-13
4. Troubleshooting
4-1-7. No Video (Component 1, 2)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Component source
Check the MT8226
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
No
Check JA3013_NT, JA3016_NT
Change the main PCB ass’y
Power Indicator is off.
Lamp(Backlight) Off, no video
No
Check component source and
check the connection of
component cable ?
Check IC5004
Change the main PCB assembly
Does the signal appear at C3028,
C3030, C3027, C3064_NT, C3066_NT,
C3063_NT?
No
Check IC6001_FBE
Change the main PCB assembly
No
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
Does the digital data appear at
output of RA5070~RA5075?
No
Please, Contact Tech support
Check the LVDS cable?
Replace the LCD panel?
Yes
Yes
Input a component signal.
Check the connected cable.
Yes
6
Yes
7
Yes
0
Caution
Make sure to disconnect the power before working on the SMPS / IP Board.
Summary of Contents for LA40A680M1R
Page 91: ...5 84 5 Exploded View Part List Memo ...
Page 95: ...1 4 1 Precautions Memo ...
Page 107: ...2 12 2 Product specifications ...
Page 108: ...2 13 2 Product specifications ...
Page 111: ...2 16 2 Product specifications Memo ...
Page 115: ...4 4 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 121: ...4 10 4 Troubleshooting WAVEFORMS 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 151: ...4 40 4 Troubleshooting Memo ...
Page 152: ...6 1 6 Wiring Diagram 6 Wiring Diagram 6 1 Wiring Diagram ...
Page 153: ...6 2 6 Wiring Diagram ...