This message was posted on behalf of Intel Corporation
Based on the information you gave us, it seems to be the problem could be related to compatibility, since this same configuration works with the LG TV and it also means that the laptop, splitter, Toslink and the amplituner are working fine.
So, in this case we need to check the specifications of the EPSON projector to find out if in fact supports AC3 or DTS.
So, to check on that you can always get in contact with Epson in order to make sure if the projector supports those formats and if it is fully compatible with this type of configuration.
Also, there is the chance that there might be a setting that needs to be enable maybe on the BIOS, also a BIOS update might be a good thing to try, and also try to install the graphics driver provided by the manufacturer of the laptop since the graphics drivers that Intel has are generic and they might not work as it should since all the features on the laptop were customized by the manufacturer, so to try a BIOS update and to get proper graphics drivers please get in contact directly with the manufacturer of the laptop.
Epson’s support site: https://epson.com/Support/sl/s
Epson’s phone number: 1 800-463-7766
Any more questions about this matter please let me know.