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  • How to Revive Dead Philips - Norelco RQ1280 SensoTouch 3D Shaver
  • 7 steps

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Introduction

A quick fix to get the device back online is to provide 3.7 - 4.2 V to the battery, enabling the circuitry to power up, and be recognised by the charger.

Step 1

              Initial Steps
  • Follow the disassembly/teardown guide to gain access to the device internals.

Follow the disassembly/teardown guide to gain access to the device internals.

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Step 2

              Remove Internals
  • Disconnect the motor, and remove the motherboard and battery assembly from the housing.

Disconnect the motor, and remove the motherboard and battery assembly from the housing.

Step 3

              Revival
  • Provide 3.7-4.2 V to the battery using a voltage-controlled power supply or buck converter. (A charging circuit might work, but since the battery voltage is so low, it might be undetectable)
  • Depending on how depleted the battery is, the period of ‘charge’ will vary. Monitoring the rate of voltage discharge provides an indication of the “holding capacity” of the battery.
  • Quickly assemble the shaver when the battery holds a voltage for a few minutes.
  • Lithium-ion batteries are sensitive components, always monitor the voltage whilst charging without a proper charging circuit.

Provide 3.7-4.2 V to the battery using a voltage-controlled power supply or buck converter. (A charging circuit might work, but since the battery voltage is so low, it might be undetectable)

Depending on how depleted the battery is, the period of ‘charge’ will vary. Monitoring the rate of voltage discharge provides an indication of the “holding capacity” of the battery.

Quickly assemble the shaver when the battery holds a voltage for a few minutes.

Lithium-ion batteries are sensitive components, always monitor the voltage whilst charging without a proper charging circuit.

Step 4

              Signs of Life
  • Briefly testing the system by pressing the power button shows signs of life.

Briefly testing the system by pressing the power button shows signs of life.

Step 5

              Reassembly
  • Assemble the device in preparation for charging.

Assemble the device in preparation for charging.

Step 6

              Charging
  • Place the shaver on the charging dock or cleaning station to begin the charging process.

Place the shaver on the charging dock or cleaning station to begin the charging process.

Step 7

              Conclusion
  • Once charged, the shaver worked as expected.
  • Naturally after many years of use, the battery shows sign of reduced capacity.

Once charged, the shaver worked as expected.

Naturally after many years of use, the battery shows sign of reduced capacity.

To reassemble your device, follow these instructions in reverse order.

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                    Rushil Kisoon

Member since: 02/18/2018

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