Mares Puck Pro Plus Broken Screen & Depth Reading Error Diagnosis

WARNING: This device contains lithium batteries. Improper puncturing or bending during disassembly can cause explosions or flames. The intervention requires precision and the assistance of a specialized technician is recommended. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

TYPICAL ERROR

Your Mares Puck Pro Plus presents a critical combination of a broken screen and erroneous depth readings. This is not a simple aesthetic issue, but an almost certain indicator of significant physical damage that compromises the vital functions of the dive computer. A broken screen destroys the watertight seal, exposing the internal electronics to a high risk of water ingress, especially in a marine environment. The depth error, on the other hand, indicates a malfunction of the pressure sensor, a key component for diving safety.

Causes and Probabilities:

1. Physical impact damage (screen and sensor): 63%

   • Why: An impact sufficient to break the screen can easily have also damaged the depth sensor or its connections, which are sensitive components. Often, a single traumatic event is the origin of both problems.
   • Key signs: Visible crack on the screen, depth errors immediately after an event (fall, hit), possible other signs of impact on the housing.
   • Counter-examples: If the screen cracked slowly without obvious impact and the depth error appeared much later, the cause could be more complex.

2. Water ingress due to broken screen: 27%

   • Why: The crack in the screen nullifies the watertight seal. Even minimal amounts of saltwater can corrode internal circuits, including those of the depth sensor or the main logic board, causing erroneous or intermittent readings.
   • Key signs: Irregular depth sensor operation, visible corrosion on battery contacts or motherboard (only visible after opening), internal fogging, salty odor.
   • Often happens when: The device is used or even just immersed in water after the crack appears, even for a short period.

3. Isolated failure of the depth sensor or display module: 10%

   • Why: Less likely with a physical crack, but a component can fail due to wear or defect. However, the concomitance with a broken screen shifts the probability towards impact or water damage.
   • Key signs: Persistent depth errors without signs of impact or ingress, display showing missing segments beyond the crack.

Safety notes: Intervening on a compromised dive computer is extremely risky. Watertightness functionality and depth sensor accuracy are crucial for diving safety. Any attempt at DIY repair can worsen the damage or fail to restore original specifications, rendering the device unreliable and potentially dangerous.

HOW TO FIX

The critical nature of the device and the complexity of the damage strongly advise against DIY repair. The decision comes down to consulting a specialized technician or replacing the device.

1. Consult a specialized technician (Most recommended choice):

• Why: A certified technician has the tools and experience to diagnose the extent of the damage, replace necessary components, and, crucially, perform watertightness tests and calibration to ensure the device is safe for diving again.
• What the technician will do:
  • Visual inspection and diagnosis: They will check the integrity of the housing, look for signs of water ingress or internal corrosion on the main logic board and battery contacts (often a CR2450).
  • Screen replacement: They will replace the Mares Puck Pro Plus Display and gaskets. This requires the use of a Precision screwdriver set and sometimes a Plastic spudger tool.
  • Depth sensor evaluation and replacement: If the error persists, the Mares Puck Pro Plus Depth Sensor will be tested and replaced, if necessary.
  • Watertightness restoration: All critical O-rings will be replaced with a Mares Puck Pro Plus O-ring Kit and pressure tests will be performed in a simulated hyperbaric chamber to ensure impermeability.

Estimated costs (for technician):

• Parts: The display and depth sensor are the most expensive components. A display can cost 50-100€, a sensor even more.
• Labor: Given the specialization and required tests, labor can range from 80 to 150€ or more.
• Total: Repair can easily reach 150-250€ or more, depending on the extent of the damage.

2. Replace the device:

• When: If the estimated repair cost exceeds 60-70% of the price of a new Mares Puck Pro Plus, or if the technician finds extensive damage (e.g., widespread corrosion on the motherboard) that makes repair uneconomical or unreliable. A dive computer is a safety device; it's not worth risking with an uncertain repair.

Output for the technician: The Mares Puck Pro Plus dive computer has a physically cracked display and inaccurate depth readings. Direct impact damage or subsequent water ingress is suspected, with compromise to the depth sensor and/or logic board. Internal inspection for corrosion, sensor integrity verification, and post-repair watertightness testing are requested.

FINAL VERIFICATION

After any (professional) intervention, it is imperative to perform a complete watertightness test and a depth sensor calibration verification in a controlled environment. If these tests fail or cannot be performed with certainty -> replace the device. Otherwise, if the tests are successfully passed, the device can be considered operational and safe again.