Overall a great repair guide. Upon completion, my MacBook Pro 13” mid-2012 did not recognize the battery. The laptop powered on as soon as the power adapter was connected. I tried resetting the SMC (shift-option-command-power) and the PRAM (boot with option-command-P-R) several times without result. I also noted that pushing the battery indicator failed to display any charge on the battery.
Before buying a replacement battery and a Mag-Safe DC in module, I inspected the DC power module and saw a “solder bridge” joining the two left-most PC board posts. The “solder bridge” turned out to be a thread of dust that remained after cleaning. The spudger easily dislodged the dirt.
Apparently, if was enough to befuddle communications with the battery, as the MBP booted on battery power after reassembly. A quick check of the System Report’s Battery Information revealed an old-but healthy battery, where previously it showed 0 charge and no battery connected. I learned a dirty logic board is not a good thing. RG
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