Signal Issues - HTPC to 4k BenQ Projector
I recently purchased a refurbished Tk800 BenQ projector that showed 4 lamp hours on the bulb.
The first test I did was with an older laptop (i5-4200m) connected via HDMI and playing a 4k h.265 video file with MPC. It seemed to do ok except audio would cut out every few seconds. I tried using Plex to play the file but transcoding choked and it would take 10 seconds to play 2 seconds of video.
I have a NUC-like fanless HTPC with a i5-5350 CPU and for my 2nd test, used an "active 4k" mini DP to HDMI converter. The projector eventually finds the signal, connects at (I believe) 3840 x 2160 30FPS, and then loses signal about every 3 seconds (screen goes blank), and takes another 5 or so seconds of searching for the signal to pick up again. This is just trying to display the Win10 desktop. I tried various HDMI cables including 6 foot ones. I also tried another mini DP to HDMI adaptor, but it doesn't say 4K or active on it. Wouldn't work at all.
For my 3rd test, I connected the HTPC to HDMI2 input on the projector. It connects at 1080p resolution and has no issues whatsoever. I believe that input doesn't support 4k resolution though, because I can't change Windows to a resolution higher than 1080. 4k videos won't transcode in Plex.
My best theory right now is that the CPU is that the 5th generation Core processor doesn't support 4k, or something along those lines. What do you think?
I ordered a laptop for my sister which should arrive at the end of the month. It has a i5-8265U CPU, so the 8th gen should fully support whatever protocols the projector is expecting. It also has a discrete GeForce MX250. I'll be able to do a 4th test then, but if there's something else I'm overlooking that can get it to work with my older gear, let me know.
Finally, I want to rule out a defective projector as I only have so long to return it under warranty.
Projector: Benq TK800 - AVR: Yamaha RX-A2080 - Front Speakers: Polk Audio Monitor 70 - Center: Polk Audio CS2: Surround: Polk Audio Monitor 30 - Atmos: 4x JBL SP8CII (not yet installed) - Sub: JBL SUB 550P - Nvidia Shield TV Pro
Give me absolute safety, or give me death!