Repair Topic

Apple MacBook Pro Retina 13 A1502 / 820-3536 — Powers from adapter but does not charge the battery

Resolved 1 answer 1 views 23 Sep 2026, 12:42 pm
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✦ TCS AI Knowledge ThreadGenerated from structured repair patterns. Verify the exact model, board revision and measurements before replacing components.

Common repair scenario: <a class="tcs-model-internal-link" href="https://tcspune.in/laptop-model-repair/apple-macbook-pro/" title="Apple MacBook Pro repair information">Apple MacBook Pro Retina 13 A1502 powers from adapter but does not charge the battery.

Motherboard / part number: 820-3536, 820-3476, A1502.

Charging requires a healthy adapter path, identification/USB-C negotiation where applicable, charger IC conditions, battery communication and current path.

Symptoms to confirm

  • The reported symptom is repeatable and not caused by an attached peripheral or temporary setting.
  • Note whether the fault changes on battery power, charger power, external display/network, or after a cold restart where relevant.
  • Record any LED blink code, beep, error text, temperature, sound or smell before opening the device.

Likely areas

Adapter identification/PD issue, input MOSFET path fault, charger IC not enabled or battery communication fault are common areas to check; the actual failed part must still be confirmed on the device.

Safe first checks

  1. Confirm adapter voltage/wattage and identification or USB-C PD negotiation where applicable.
  2. Check battery health separately from the board.
  3. Inspect the charge input/current path and connector condition.

Question: What diagnostic order and repair path should be followed for this Apple MacBook Pro Retina 13 A1502 fault without replacing parts by guesswork?

1 Answer

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Accepted TCS AI solution for <a class="tcs-model-internal-link" href="https://tcspune.in/laptop-model-repair/apple-macbook-pro/" title="Apple MacBook Pro repair information">Apple MacBook Pro Retina 13 A1502 / 820-3536, 820-3476, A1502: diagnose the fault in stages and replace a part only after the failed stage is proven.

Diagnostic order

  1. Confirm adapter voltage/wattage and identification or USB-C PD negotiation where applicable.
  2. Check battery health separately from the board.
  3. Inspect the charge input/current path and connector condition.
  4. Measure charger IC supply/reference/enable signals using exact board documentation.
  5. Check battery communication/current-sense path before replacing the charger IC.

Repair path

  1. Repair adapter-ID/PD/input-path faults when proven.
  2. Replace a failed battery only after board-side charging is confirmed healthy.
  3. Repair the charger/current-sense stage based on measurements.
  4. Update BIOS/EC only when the exact model has a documented charging firmware issue.

Verification after repair

Repeat the original symptom test, complete at least one cold boot/restart cycle, and check the related function under normal load. Confirm there are no new warnings, abnormal heat, intermittent connections or charging/display/network errors before closing the job.

Safety: Do not short battery or charge-current sense paths. Stop if the battery is swollen, hot or physically damaged.

This is a TCS AI knowledge-base answer based on common repair patterns. Exact diagnosis can differ by board revision and component configuration.

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