4-12
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 TAS5715
-
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 IC1102.
No
Picture is display, no sound.
Check a B13V Line.
Change a main PCB ass’y.
No
Does the signal appear at
pin #15,#20,#21,#22 of IC1603?
Check the DC 13V BD1603_13VS
of IC1603?
Please, Contact Tech support.
No
Does the sound data appear at
TP L-,L+,R_,R+?
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.
Summary of Contents for LN22C450E1M
Page 6: ...1 4 1 Precautions Memo ...
Page 31: ...4 4 4 Troubleshooting WAVEFORMS 1 R G B Output Signal PC_R Signal PC_G Signal PC_B Signal ...
Page 33: ...4 6 4 Troubleshooting WAVEFORMS 1 Signal of HDMI Data 2 Digital Output Data ...
Page 38: ...4 11 4 Troubleshooting WAVEFORMS 1 AV_CVBS Output Signal ...
Page 40: ...4 13 4 Troubleshooting WAVEFORMS 1 I2C Data 3 Speaker out ...
Page 102: ...6 9 6 Wiring Diagram 6 2 Wiring Picture HD MODEL C450 22 HD MODEL C450 FHD MODEL C530 C550 ...