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4-13
4. Troubleshooting
4-1-7. No Sound
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the RF Source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
No
Check a connection harness and
headphone jack./Side AV
Check Sound Processor
IC5001 (M-star)
No
Picture is display, no sound.
Check a B12V Line.
Change a main PCB ass’y
No
Does the signal appear at pin 232, 236,
234,237(I2S_CLK, I2S_SCLK, I2S_
LRCLK, I2S_DATA) of IC1201?
Check the DC 12V
of IC2001?
Change a main PCB ass’y.
No
Does the signal appear at
Pin 47 or 48, 53 or
54(CH1_L, R Sound) And Pin
36 or 37, 30 or 31
(CH2_L, R Sound) of IC2001?
Replace the speaker ass’y?
Yes
Connect a sound cable.
control a volume.
Yes
1
Yes
3
Yes
2
Caution
Make sure to disconnect the power before working on the IP board.
Содержание LA40A350C1X
Страница 10: ...3 6 3 Disassembly and Reassemble Memo ...
Страница 42: ...1 4 1 Precautions Memo ...
Страница 48: ...2 6 2 Product specifications Memo ...
Страница 49: ...7 1 7 Schematic Diagram 7 Schematic Diagram 7 1 Coral Block Diagram ...
Страница 50: ...7 2 7 Schematic Diagram 7 2 Schematic Diagrams 7 2 1 MAIN POWER BLOCK ...
Страница 51: ...7 3 7 Schematic Diagram 7 2 2 SOUND AMP Schematic Diagram 7 2 3 HDMI Input Schematic Diagram ...
Страница 53: ...7 5 7 Schematic Diagram 7 2 6 IC LCD CONTROLLER Schematic Diagram 7 2 7 DDR and Service Port Diagram ...
Страница 54: ...7 6 7 Schematic Diagram 7 2 8 FBE2 Schematic Diagram ...
Страница 58: ...4 4 4 Troubleshooting WAVEFORMS 1 R G B Output Signal ...
Страница 60: ...4 6 4 Troubleshooting WAVEFORMS 2 Digital Output Data 3 Signal of HDMI Data ...
Страница 62: ...4 8 4 Troubleshooting WAVEFORMS 3 CVBS Output Signal 4 Tuner_CVBS Output Signal ...
Страница 64: ...4 10 4 Troubleshooting WAVEFORMS 4 CVBS Output Signal ...
Страница 66: ...4 12 4 Troubleshooting WAVEFORMS 2 Digital Output Data 5 Analog Signal Y C ...
Страница 68: ...4 14 4 Troubleshooting WAVEFORMS 6 The Signal are Inputed to IC1201 7 The Signal are Inputed to IC1202 ...
Страница 77: ...4 23 4 Troubleshooting 4 6 2 Software Upgrade Flash Downloader Flash Downloader ...
Страница 82: ...6 4 6 Wiring Diagram 6 2 Wiring Picture ...