I did not watch video since this is a PS-2 3V upgrade, the whole speaker issue and with Battery high indicates the 5V processor is getting overloaded and shutting down the board. Speaker can still be issue, along with smoke fan now, so turn smoke off. But Battery HI indicates a problem with battery or battery charging circuit and I suspect you also have a board issue. Hopefully just the top power supply board as that is repairable/replaceable. If the bottom board is damage on the battery circuit your out of luck as that is not repairable or replaceable as it is obsolete. And a PS-32 upgrade is required. G
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