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It sounds that the IIC Bus circuit shorts bey some faulty components connected to it. The troubleshooting work to this section circuit is very skilled one. If
you are not familiar with electronics, do not attempt to repair. Whether you sufferfatal electrical shock!
Instead, contact the nearest service center.
It sound like a short circuit. I had this problem with 1907FP model. It had an USB port on the monitor which got damaged and it was shortening to the groung. In your case it might be a bad internal power supply board.
Have you checked the power output from the power board? Is it constant and steady? Try reflowing all the joints if you haven't already. Especially transformer and coil joints. Maybe a bad logic board? Do you have spares to try? Does it do this with everything disconnected from the pwr board (switch, logic, inverter)?