Sony vpl es7

Check the fan connections, one might not be connected right if you have just serviced it. Switching off with a flashing red light usually indicates a fan error.
Also is there a sequence to the flashes? e.g, 4 flashes and pause?
some manufacturers have a fault code table for the amount of flashes.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/

You might check the following:

* signal is going to the input. If not, does the menu come up?
* air flow is ok. Projectors don't run well if they are hot and can't breathe

Have you connected the USB cable to your laptop so that the Sony remote can act as a mouse? Did the laptop respond by loading drivers?

check the lamp please,
to replace it with a new lamp,to check it
any questions, feel free to contact me
have a nice day!
Jerry,Lampdeng Limited

you can unlock it only by using remote control
remote control ,unit price is USD20
Have a good day!
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https://www.manualslib.com/products/Sony-Vpl-Es7-3416454.html

Sony VPL ES7 Manuals

What is the problem??

lower the screen resolution of the comupter until the picture appears

check that all vents are clear and that the fans are working, it maybe a self protect feature when it detects over heating and automatically shuts off