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One common cause of power supply problems is a faulty power adapter. If the power adapter is not providing a stable and consistent voltage to the device, it can result in the device not turning on, or shutting down unexpectedly. If this is the case, you may need to replace the power adapter in order to get the device working properly again.

Another potential cause of power supply problems is a faulty power switch. If the power switch is not making proper contact, or if it is damaged, it can prevent the device from receiving power. In this case, you may need to replace the power switch in order to get the device working properly again.

Another possible cause of power supply problems is a malfunctioning internal component such as a capacitor, diode or transistor. These components are responsible for regulating the power to the device and any malfunction may cause the device to not work. This type of problem will require a technical person with electronic knowledge to repair.

It's also possible that the problem is not with the power supply itself, but rather with another component of the device that is preventing it from functioning properly. In these cases, further troubleshooting will be needed to identify and fix the underlying issue.

Given that there can be many causes to the issue, it's best to consult the manufacturer's technical support or a professional technician. They will be able to diagnose the issue and provide the best course of action to fix the problem.

please find service manual - Good Luck !