4-22
4. Troubleshooting
4-1-8. No Sound
Symptom
Video is normal but there is no sound.
-
Major
checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning.
Speaker defect..
-
-
-
Caution
Make sure to disconnect the power before working on the PD board.
Diagnostics
CN3001
CN3005
CN3004
CN3011
CN3001
CN3005
CN3004
CN3011
Check CN3005
Change the main PCB assy
No
Yes
No sound
Yes
Check the sound source and
check the connection of
sound cable?
No
Input a sound signal.
Check the connected cable.
Yes
Check the LVDS cable?
Replace the speaker?
Please, contact Tech support
No
Does the digital data appear at
pin27,28,29 of IC2002?
No
Check IC2001
Change the main PCB assembly
!
Does the signal appear at R3069,
R3071?
Yes
Does the signal appear at
pin1~4 of CN2001?
No
Check IC2002
Change the main PCB assembly
@
Yes
0
Summary of Contents for UA40B7000WM
Page 7: ...1 4 1 Precautions Memo...
Page 37: ...4 3 4 Troubleshooting...
Page 43: ...4 9 4 Troubleshooting PIN27 A5V PIN23 B12VS PIN15 B5V PIN9 B13V...
Page 45: ...4 11 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK...
Page 49: ...4 15 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 6 Eagle Out Clk H Sync...
Page 51: ...4 17 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0...
Page 53: ...4 19 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar...
Page 55: ...4 21 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 9 Component Input Y Pb...
