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Judging from the problem, it should be a hardware failure. Let's do some hardware tests. If you can solder, please follow these steps.
1. Open all channels, switch the volt/div between 200mV and 500mV, and check whether there is relay sound.
2. Input 1kHz/10Vpp square to four channels at the same time, their voltdiv is set to 100mV, their probe ratio is consistent. Compare and test the waveforms of several points marked in the figure below.
If you can't weld, please contact the seller for repair.
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