MacBook Pro A1989 Battery not recognized repair

MacBook Pro A1989 Battery not recognized repair
Device	MacBook Pro A1989
Affects part(s)	Motherboard, battery
Needs equipment	multimeter, soldering iron, soldering station, thermal camera
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Problem description

MacBook A1989 not recognizing the connected battery

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Symptoms

• MacBook not turning on.
• Battery not recognized/charging

Solution

• First, try a known good battery.
  • If it doesn't work, check the battery cable going to the board.
    • Sometimes there is corrosion here, sometimes the customer tore the bar on the connector off the connector.
• In some rare cases the SMC still is a factor in battery recognition on this board.