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 MT8226
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check TU3001.
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 IC5004
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 RA5070~RA5075?
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
No
Check IC6001_FBE
Change the main PCB assembly
8
6
7
Does the signal appear at TU3001?
Caution
Make sure to disconnect the power before working on the SMPS / IP Board.
Содержание LN32A550P3R
Страница 7: ...1 4 1 Precautions Memo ...
Страница 21: ...2 14 2 Product specifications Memo ...
Страница 23: ...3 2 3 Disassembly and Reassemble Description Picture Description Screws 3 Lift up the rear cover ...
Страница 30: ...4 4 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Страница 32: ...4 6 4 Troubleshooting WAVEFORMS 4 5 HDMI Input CLK 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Страница 36: ...4 10 4 Troubleshooting WAVEFORMS 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Страница 42: ...4 16 4 Troubleshooting WAVEFORMS Audio Input Sign Wave 12S Input Clk Data Audio Amp Out Sign Wave ...
Страница 66: ...4 40 4 Troubleshooting 3 2 Self EDID 1 Option Table control EDID Protect On EDID Protect off EDID WRITE ...
Страница 68: ...4 42 4 Troubleshooting Memo ...
Страница 148: ...5 80 5 Exploded View Part List Memo ...
Страница 149: ...6 1 6 Wiring Diagram 6 Wiring Diagram 6 1 Wiring Diagram 6 1 1 LN32A550P3R LN40A550P3R LN46A550P3R ...
Страница 150: ...6 2 6 Wiring Diagram ...
Страница 153: ...7 1 7 Schematic Diagram 7 Schematic Diagram 7 1 MT8226 Block Diagram ...
Страница 154: ...7 2 7 Schematic Diagram 7 2 Video Input Output Path ...
Страница 155: ...7 3 7 Schematic Diagram ...
Страница 156: ...7 4 7 Schematic Diagram 7 3 Audio INPUT OUTPUT ...
Страница 157: ...7 5 7 Schematic Diagram ...
Страница 158: ...7 6 7 Schematic Diagram 7 4 Schematic Diagrams 7 4 1 Main Power Block Function Block ...
Страница 159: ...7 7 7 Schematic Diagram 7 2 2 Audio Codec Pop Noise Solution Sound Amp NTP3100 7 2 3 Back AV IN OUT ...
Страница 160: ...7 8 7 Schematic Diagram 7 2 4 Side AV IN OUT PC 7 2 5 HDMI Switch HDMI Input ...
Страница 161: ...7 9 7 Schematic Diagram 7 2 6 Tuner Service Block HDMI Input 4 7 2 7 Video Decoder Scaler MT8226 Sub Micom WT6198 ...
Страница 162: ...7 10 7 Schematic Diagram 7 2 8 DDR RAM Main EEPROM FLASH MEMORY 7 2 9 FBE2 ...
Страница 163: ...7 11 7 Schematic Diagram 7 2 10 LVDS DIMMING ...
Страница 164: ...7 12 7 Schematic Diagram Memo ...