FanJu FJ3531 Projection Alarm Clock with USB Charger Port Repair

The FanJu FJ3531 is an entry-level digital projection alarm clock manufactured by FanJu. It features a primary digital LCD screen displaying time, date, indoor temperature, and indoor humidity, complemented by an integrated 180-degree swiveling projection arm that projects time and outdoor/indoor temperature onto a wall or ceiling.

The clock offers dual alarm functionality, 4-level backlight brightness adjustments, and a built-in USB output port (5V/1A) for charging external mobile devices. It operates via an external DC 5V USB power input or 2 × AAA backup batteries.

Here is a link to the Troubleshooting Page for the FanJu FJ3531 Projection Alarm Clock: FanJu FJ3531 Repair and Troubleshooting

• Battery: 2 × AAA 1.5V batteries (for memory/backup power)

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• Brand: FanJu

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• Colour: Black / Silver

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• Connectivity: RF wireless receiver (select RCC/DCF radio-controlled variants)

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• Connectors: 1 × DC 5V 1.2A power input port, 1 × USB Type-A output port (5V 1A power output)

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• Dimensions: 135.0 × 80.0 × 30.0 mm

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• Display: Monochrome Digital LCD with multi-level backlight

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• Graphics Card: Integrated

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• Miscellaneous: 180-degree rotatable red LED time/temperature projector, dual daily alarms, 5-minute snooze button, indoor hygrometer (20%–95% RH), indoor thermometer (-9.9°C to +50°C)

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• Operating System: Embedded Microcontroller Firmware

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• Processor: 8-bit Microcontroller Unit (MCU)

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• RAM Size: Integrated

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• Resolution: Segmented LCD

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• Screen Size: 3.0 "

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• Sensor: Digital indoor temperature sensor, digital humidity sensor

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• Storage: Integrated EEPROM

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• Weight: 280.0 g

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• Year of release: 2018

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• FanJu Home Official Website

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• iFixit: FanJu FJ3531 Repair & Disassembly Guide

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• iFixit: General Alarm Clock Repair Help