Start at the wall and work back to the lamp
Before assuming failure, establish what the unit did on day one. Most HD 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 HD 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.
Colour and artwork faults
Colour faults split into two groups. A global cast — everything is pinker or greener than it was — points at the colour filter or the LED itself. A fault confined to part of the image points at the gobo: a coating that has crazed, a glass gobo that has cracked, or contamination on one side. Knowing which you have saves replacing the wrong part.
- 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
Note the timing. Cut-out after 60–90 minutes is thermal; a trip at switch-on is inrush or a wiring fault; a hum that appears only at full output is the driver. All three are fixable without replacing the HD gobo projector, but all three get misdiagnosed as a dead unit when nobody records when the fault occurs.
- Note when the fault occurs — at switch-on or after warm-up
- Measure the supply at the unit under load
- Check the housing temperature and ventilation
- Confirm the protective device is correctly sized
What to have ready before you call
Warranty claims go faster with evidence. Record the model, install date, daily run hours, throw distance and a photo of the fault. For an HD gobo projector the most useful single piece of information is whether the fault is gradual or sudden — gradual almost always means environment, sudden almost always means a component.
- Model and serial number
- Install date and daily run hours
- Throw distance and image width
- A photograph of the fault at the working hour
