20 Most Recent ViewSonic PJ-551 Home Theater Projector: Ceiling/Wall Mount Kits Projector Lamp for PJ551 Projectors Questions & Answers

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try changing the refresh rate

Check if there is a cooling fan. Is it rotating? It is also possible that the filter is dusty and needs to be cleaned/replaced. (all projectors have a cooling fan and a filter to prevent dust from reaching the lamp. A faulty fan or a reduced air flow may cause an overheat problem)

Hello, It may be the DMD chip. Do you get the spots on the display even when there is no source connected? Are the spots multiplying? If so, then it is the DMD chip. If it is under warranty, then ship it back. Also, if the projector is less than 5 years old, you could get the chip replaced for free. Some DMD chips have a 5 year warranty that are still good even after the projector's warranty.

you may need to switch the screen display setting to either duplicate or extended . https://support.google.com/chromebook/answer/1060909?hl=en http://www.chromestory.com/2013/05/how-to-manage-external-displays-connected-to-your-chromebook/

You think there is a manual with remote codes for devices? All universal remote controllers, have their own manual, with the known codes the moment the remote was developed. For newer devices, you have to find out yourself if the remote will work. Most remotes have a setup mode, where you can check if the devivce will react on the remote, by putting it in that mode and pressing one or 2 buttons, to see with what button the device switches on or off. Not knowing what remote you have, nobody can even search for any code that fits in your remote.