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LG Oscilloscope issues

Discussion in 'Troubleshooting and Repair' started by PedroC402, Apr 7, 2020.

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  1. PedroC402

    PedroC402

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    Apr 7, 2020
    My OS-5020RB failed recently and after some investigation I found that the 195V power supply rail had failed. I managed to get it back again after replacing the defective components and I now have a display but with issues. with a sine wave (or any other) on either channel the display looks good but if I use the position pot to move the trace down the screen the amplitude of the signal is compressed. From the centre of the screen upwards it is fine but from the centre down I get the compression. Also the digital readout on the screen is out of focus and that too compresses when the trace is moved down. The voltages at the test points are all fine. Any thoughts would be appreciated.
     
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