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Because of the incredibly high power consumption of the lamp (400 W), our homemade projector needs sufficient cooling - the integrated fan in the Liesegang projector just doesn't cut the mustard. Heat build-up occurs especially between the projector's LCD panel and glass top, due to thermal conduction from the lamp that can only be prevented by permanent air circulation.
The initial sign of the display overheating is a brown ring that appears in the area that gets too hot, which shrinks again when the unit is cooled. If the heat level is not reduced relatively quickly, this is followed by failures in the corresponding areas. The display becomes permanently burnt out if repeatedly overheated, and will no longer display in the damaged area.
For our test construction, we fitted various fan types in a number of positions. The result: all you need is a single 8 cm fan that creates airflow under the LCD panel. An additional power supply for this can be created using a standard ATX power unit. An office fan set at the lowest speed is also an option.

This fan does the job: permanent air circulation between the LCD panel and glass top

Only for testing and adjustment: the 8 cm fan taped in place.

The nearly completed project.

The Liesegang projector with installed LCD panel and leads. And we're off!

The fan running at full tilt, powered by an external ATX adapter. Other solutions are also possible.
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Hi,
I'm a 12 year old and I just got this projector working. If you live in the bay area then I recommend you go to Weirdstuff that is where I got all my parts for all under $46