MacBook Pro A1990 Battery not recognized repair

MacBook Pro A1990 Battery not recognized repair
Device	MacBook Pro A1990
Affects part(s)	Motherboard, battery
Needs equipment	multimeter, soldering iron, soldering station
Difficulty	◉◉◉◌ Hard
Type	Soldering, Part replacement

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Problem description

MacBook A1990 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.