Battery Testing Flex Cable (Diagnostic / Bypass Flex) for MacBook Pro 15″ (Model A1990, 2018–2019)

Professional battery testing flex cable for MacBook Pro 15″ (Model A1990, 2018–2019)—used by technicians to bypass a faulty battery or diagnose power-on issues without permanent battery removal. Enables safe logic board testing and troubleshooting.
This is not a replacement battery cable—it’s a diagnostic tool used in repair workflows. It mimics the battery’s presence by providing the necessary SMBus signal and power-enable lines to the logic board, allowing the MacBook to:
Power on without a battery installed
Test logic board functionality independently
Diagnose whether a no-power issue is caused by the battery or logic board
MacBook Pro 15″ (2018–2019) Model: A1990 Model Identifiers: MacBookPro15,2 Chip: Intel Core i7/i9
Model: A1990
Model Identifiers: MacBookPro15,2
Chip: Intel Core i7/i9
⚠️ Not compatible with A1707 (2016–2017), A2159 (16″), or any M1/M2 models.
Simulates battery presence via correct SMBus resistance and ID signals
Includes power-enable circuitry matching Apple’s safety protocol
Pre-terminated with OEM-style connector for A1990 logic board
Allows safe bench testing of logic boards during repair
Diagnosing “no power, no fan spin, no display” issues
Verifying if a logic board powers on without risking a shorted battery
Testing after liquid damage or DC-in board replacement
Avoiding unnecessary battery replacements during diagnostics
Not for permanent installation—intended for temporary diagnostic use only
Does not charge or store power—requires connected USB-C power adapter to operate
Must be used with a known-good power adapter (87W recommended)
Not a consumer part—designed for professional repair shops and technicians