High Voltage/Power Supply Issues: Set is Pulsing

The final power supply related issue is a set that pulses. The SMPS in these projectors shut down when they sense a short in the set, and tend not to self destruct in the case of a short. The power supply turns off, but then tries to restart when it sees a short. This causes the power supply to pulse at a rate somewhere between three times a second and once a second.

While it’s likely that the short is right on the SMPS board itself, it’s also possible for a shorted board anywhere in the set to cause this pulsing. Pull each board one at a time and power the set back up. If you remove a board with a short on it, the pulsing should stop. Send that board in for repair.

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