Powering the heater circuit in an MK-V Hummingbird monitor when using the PRO connector for video

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2011Monitors forum

15 years old. Gear and prices may have changed since.

The MK-V Hummingbird monitor includes a heater that is wired to pins 14 and 15 of the internal 15-way D connector.
The heater can be powered independently from the PRO connector by connecting a separate power source to the 4-pin Lemo connector on the rear breakout box, routing it to pins 14 and 15 of the D connector.
Powering both the PRO connector and the 4-pin connector simultaneously does not cause damage, allowing video and power to come through the PRO connector while the heater receives power from a separate source.
A simple modification involves adding a switch to control heater power and connecting it to the D connector pins, which can be powered from sources such as a P-tap battery or spare DC outputs.
Extreme cold conditions, such as 8 degrees Fahrenheit, can cause LCD image degradation even when the monitor is on, and heater functionality becomes critical in such environments.

The original MK-V documentation and schematics were unavailable to the user, making diagnosis difficult without manufacturer support.
The heater wiring implementation by MK-V may vary between units, as the panel manufacturer stated they supply heaters to MK-V but do not know how the integrator connects them.
The thread does not detail whether the heater mod was successfully completed or tested after modification.
The experience is specific to cold exterior filming conditions and may not apply to normal operating environments.