Red Power Light - means?

Hi all,

I have a problem with my Benq TH681 projector.

The Power LED is red after plugging in. TEMP and LAMP LEDs are off. Projector is not starting.

In the user manual I only can find "download" near the error description.

Any idea what this mean?

Firmware maybe?

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@stigpfau looks like your projector is in Download mode. " In download mode, system will be

supported by full power but will not turn on projector."

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Allright ;-)

But how to quit the download mode?


What happens if you unplug the projector for a while? does it reset? Have you tried to enter the same sequence to see if that will get you out of the download mode? If nothing else and at a last resort have you tried to download new firmware?


... for thos model I can't fin a firmware.

BenQ ist not very customer friendly at this point.


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Yeah, the "Download" description isn't very helpful. I did a word search, and the only other time the word download is used in the manual is on Page 44 with the Baud Rate of the Advanced Setup Menu. Here it is talking about downloading firmware, so most likely the "Download" description you found is referring to downloading firmware as well. Unfortunately, Page 44 also says "This function is intended for a qualified service technician", and I was unable to find anything on firmware updates for your model.

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Thank you for your answer.

Let's talk to a service technican.


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It appears that your Lamp is in a damaged state and needs to be replaced.

It is NOT in some "Download mode" as others have stated.

Here is a table that will give all the states of the led indicators regarding your projector;

I hope this helps!

Rich Lilja

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