Roadstar DVD-5105, Service Manual

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- If the above step does not work, replace the Main Board.
T39 DVD noise
1. Power Board
- Remove the top cover and check if the Flat Cable connected to Power Board is
correctly plugged in the right position, it not, plug it again for testing.
- If the above step does not work, remove the fixation screw from the Power Board and
replace the Power Board.
2. Main Board
- Check if Main Board U16-5pin and U6-39pin have 18.432MHz, if no such frequency
is available, it would suggest that U16 or U6 NG, replace them.
- Update F/W and confirm for improvement.
- If the above step does not work, replace the Main Board.
TB0 CBS no waveform (audio) or abnormal waveform (audio)
1. Power Board
- Remove the top cover and check if the Flat Cable connected to Power Board is
correctly plugged in the right position, it not, plug it again for testing.
- If the above step does not work, remove the fixation screw from the Power Board and
replace the Power Board.
2. Main Board
- Check if Main Board U9-pin 10 for 16.9344MHz, if no such frequency is available, it
would suggest that U9 is NG, replace it.
- Update F/W and confirm for improvement.
- If the above step does not work, replace the Main Board.
TB1 MP3 noise
1. Power Board
- Remove the top cover and check if the Flat Cable connected to Power Board is
correctly plugged in the right position, it not, plug it again for testing.
- If the above step does not work, remove the fixation screw from the Power Board and
replace the Power Board.
2. Main Board
- Check if Main Board U9-pin 10 for 16.9344MHz, if no such frequency is available, it
would suggest that U9 is NG, replace it.
- Update F/W and confirm for improvement.
- If the above step does not work, replace the Main Board.
TB2 Audio no waveform (sound) or abnormal waveform (sound)
1. Main Board
- Check J13 of Pin1 and Pin6 on Main Board for missing welding, cold welding, short
circuit, interruption, missing parts or wrong parts, if any, correct.
- Check post U9 for missing welding, cold welding, short circuit, interruption, missing