Diagnose in the order light travels
Before assuming failure, establish what the unit did on day one. Most outdoor gobo projector complaints describe a gradual decline that nobody dated, which makes it impossible to tell a failing LED from a dirty lens. Take a photo, note the hour and the house lighting, and compare against the install record.
- What the surface looks like and how it is lit
- Whether the image is uniformly soft or soft at one edge
- When the fault started — overnight or gradually
- Whether anything on site changed at the same time
The image is soft or out of focus
Blur has three causes and only one needs a new part. First, focus drift — housings expand as they warm and short throws are more sensitive than long ones. Second, an off-axis mount, where one side of the image is genuinely further away than the other and no focus setting fixes both. Third, a surface that is not flat, which scatters the image at the edges.
- Refocus at the working hour on the actual surface
- Check the corners — soft corners mean an angled mount
- Confirm the surface is flat
- Inspect the lens and gobo for contamination
Dim: ambient light, output and dirty optics
Before blaming the LED, clean the optics and check the duty cycle. an outdoor gobo projector that runs hot in an enclosed void will dim progressively as the driver protects itself, and the symptom looks exactly like lamp wear. Logging the housing temperature over a full evening will separate the two.
- Clean the outer window and lens
- Measure ambient light at the working hour
- Reduce the image width and re-check contrast
- Run a full duty cycle and log the housing temperature
Colour is wrong or the gobo looks damaged
If the whole image has shifted, suspect the filter; if only part has, suspect the gobo. Dichroic coatings are stable for years, but dyed glass browns under heat, and an outdoor gobo projector running at the top of its range will age a cheap filter in a single season. Photograph the image against a white reference and compare it with the install photo.
- Compare against the install photograph
- Decide whether the whole image or part of it is affected
- Inspect the gobo against a light at an angle
- Check the original artwork file resolution
It cuts out, hums or trips
Intermittent faults are thermal or connection problems. an outdoor gobo projector that runs for an hour then cuts out is overheating or has a marginal supply; one that hums has a driver or a transformer under load; one that trips a breaker usually has a genuine earth fault or an over-sized protective device. Log when it happens — after warm-up, at switch-on, or at random — and the pattern identifies the cause.
What to have ready before you call
Stop diagnosing and call when you have eliminated the three cheap causes: contamination, ambient light and supply. Before you do, gather the serial number, the install date, and a photograph of the image on the wall at the working hour. A supplier can usually resolve it from those without a site visit.
- Model and serial number
- Install date and daily run hours
- Throw distance and image width
- A photograph of the fault at the working hour
