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 MT5382
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check TU301
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 IC400
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact 1 800 Samsung
No
Does the digital data appear at output
of R721~R740, R788~R791?
Does the digital data appear at output
of R1109, R1110, R1113P, R1114P,
R1116P, R1120P, R1122~R1128,
R1133, R1135, R1137P~R1141P,
R1143~R1150?
No
Check IC1101
Change the main PCB assembly
8
6
7
Does the signal appear at TU301?
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LN32A550P3F
Page 7: ...1 4 1 Precautions Memo ...
Page 162: ...4 3 4 Troubleshooting ...
Page 163: ...4 4 4 Troubleshooting ...
Page 165: ...4 6 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 168: ...4 9 4 Troubleshooting ...
Page 171: ...4 12 4 Troubleshooting ...
Page 174: ...4 15 4 Troubleshooting ...
Page 176: ...4 17 4 Troubleshooting WAVEFORMS 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 177: ...4 18 4 Troubleshooting ...
Page 180: ...4 21 4 Troubleshooting ...
Page 183: ...4 24 4 Troubleshooting ...
Page 186: ...4 27 4 Troubleshooting ...
Page 197: ...4 38 4 Troubleshooting Memo ...
Page 201: ...6 4 6 Wiring Diagram Memo ...