a similar pulsating behaviorism is a symptom of a faulty main charger and its switching transistor. If you plan to fix it yourself, these two ics should be replaced. It looks like a reverse polarity connected current to me, as if someone made a mistake when trying to repair. It happens sometimes. If you prefer to have such a repair done, find a good repair shop, remove the motherboard and bring it back. Order replacement of the TI SN2400B0, DRV2604YZF and CSD68815W15 transistor. The components cost half a dollar each and soldering these little ones shouldn't be too expensive either. However, this does not exclude other post-flooding problems that will also need to be resolved.
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