1.3 No Sound
Check following steps.
Part 4: Troubleshooting
4-5
Check IC001 and peripheral circuit.
Check the switching voltage at pins 9 and 10.
pin9: L pin10: L: PC audio input
pin9: L pin10: H: AV audio input
Check if the audio
signal is observed at
pins 2 and 13 of IC001.
Check audio output circuit.
Check speaker, connection of the terminals “K10U”,
“K8F/K8Q”.
Yes
No
Check IC5001 and peripheral circuit.
Check the volume control voltage at pins 2 and 6 of IC5001.
L: volume min. H: volume max.
Check if the audio
signal is observed at
pins 3 and 5 of IC5001.
Yes
No
Check IC5021 and peripheral circuit.
Check buffer transistors Q5041, Q5042.
Check if the audio
signal is observed at
pin 2 of IC5061.
Yes
No
Check IC5061 and peripheral circuit.
Check the mute control voltage at pin 1 of IC5061.
L: mute on
H: normal
Check that the mute signal output from pin 13 of IC2324<D/A>.
Check if the audio
signal is observed at
pins 6 and 8 of IC5061.
Yes
No
Summary of Contents for LV-7215U
Page 9: ...Part 1 General Information ...
Page 25: ...Part 2 Repair Information ...
Page 43: ...Part 3 Adjustment ...
Page 66: ...Part 4 Troubleshooting ...
Page 78: ...Part 4 Troubleshooting 4 12 AN5870 RGB SYNC SW IC1201 IC5201 BA7078 Sync Separator IC5341 ...
Page 80: ...Part 4 Troubleshooting 4 14 CXD3536 LCD Driver IC401 FA5502 P F Control IC621 ...
Page 81: ...Part 4 Troubleshooting 4 15 M62392 M62393 D A IC6271 IC281 ML60851 USB Driver IC9801 ...
Page 83: ...Part 4 Troubleshooting 4 17 TC90A69F Y C Separator IC2101 ...
Page 84: ...Part 5 Parts Catalog ...
Page 85: ......
Page 99: ...Part 6 Electrical Diagrams ...