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Question Growing black oval after 1-2 min on my projector

bowaggo

Novice Member
Hi, I bought a generic projector brand new off ebay but it was defective, my money was refunded and I got to keep the projector, I'm really curious to know what's the problem.
It's an Excelvan/cheerlux cl720D

Here's a video showing the problem

Brand: Excelvan
Model: CL720D
Color: Black, White
Material: Glass, Plastic
Display Type: LCD
Native Resolution: 1280 x 800
Aspect Ratio : 4:3 / 16:9
Resolution Support: 1080P
Brightness: 3000 Lumens
Contrast Ratio: 2000:1
Lamp Life: 50000 hours
Throw Ration: 72inch - 2.08m, 84inch - 2.37m, 100inch - 3m, 120inch - 3.38m
Lens : Manual Focus
Image Scale: 4:3, 16:9
Image Size: 50 - 140 inch
Power Supply: 90-240V/50-60Hz
Lamp: LED
Lamp Power: 150W
Interface: AV, TV
Other Features: Built-in Speaker (5W x 2)

I could not find anything similar to this issue on google except one thread on amazon by a buyer who has the same issue with a different projector
 

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