Losing picture randomly on TV until I change Refresh rate on Laptop graphics card?

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Brandon Byrnes

PCHF Member
Jan 3, 2017
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Wisconsin
Hey guy's I've been having a continuous problem. I have my 4K tv hooked up to my laptop via HDMI, my laptop is a HP ProBook 450 G3, with 16GB of RAM a M.2 256GB SSD, and a 1TB SSD. My graphics card (if you can call it that) is a Intel HD Graphics 520 card. For months now I have been having an issue with my TV randonly losing video, but not audio. In order to get the video back I have to change the video source on the TV then go back to HDMI. I currently have the resolution on my laptop set to 3840 x 2160. Well I've been getting really irritated by this problem and intially thought it was the TV, so I was going to buy a new TV next week. But then I got the idea of trying my roommates laptop connected to the tv, and playing a video file that always made that problem occur at a certain point in the video.
Well I played the video using his laptop and it didn't black out. But his laptop is very old and doesn't support 4k, so I got the idea of going into the Intel Graphics settings, and on a lark decided to change the graphics card refresh rate from 24Hz to 30Hz. I replayed the video and sure enough it didn't wig out on me. So to make a long story short has anyone ever heard of a problem like this, that having the refresh rate set too low will cause random picture loss? I've replayed the video multiple times and it now doesn't lose picture so hopefully it's fixed. I've never heard of there being a problem with the refresh rate set too low, usually I've only heard of a problem occurring if it's set too high, but setting it higher for me seems to have fixed the issue.
Any help would be appreciated, this kinda has me baffled.
 
Hi Brandon. It could be that you needed a higher refresh rate in order to have smooth playback of a video at that resolution on the TV so yes having a lower refresh rate can cause loss of video in certain situations especially since you using such a high resolution.

Does lowering the resolution allow you to play the video at the 24Hz refresh rate without problems?
 
I haven't tried lowering the resolution yet, TBH I really don't want to, lol. It looks so good at 4K, but i have had the issue happen once again, but only once since raising the refresh rate. At this point I'm just thinking maybe I don't have a good enough video card to support it, considering its just the integrated Intel 520 card (although when I go into the Intel graphics dashboard it shows that 5K is supported for a resolution). I also noticed that raising the refresh rate has actually caused ghosting when I scroll really fast on webpages, and move the mouse pointer fast which I thought was supposed to be the opposite, a higher refresh rate should equal less ghosting/trailing. I was considering buying a external graphics card, but those things are expensive, and I've already put atleast $300 into this laptop by upgrading the RAM and storage, I really don't feel like spending more money on it.
 
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Well it is possible that this issue is just a limitation of the Intel integrated video chip. You can try updating the Intel Graphics driver if you are using an older version but beyond that you may have to either lower the resolution or consider buying a dedicated video card.
 
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