TV Screen goes blank 2-3 seconds

LCD TV 40" screen connected to the laptop with HDMI cable.  Once in a while randomly  goes dark/turns off for 2-3 seconds.  TV power stays on.  Laptop screen stays on.

Should I try another HDMI cable or there issue with a laptop?    Any ideas?  

Thanks.
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Tiras25Asked:
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Tiras25Connect With a Mentor Author Commented:
Replaced laptop and HDMI cable.  Still blinking randomly.   Tried another HDMI port on TV as well.  

At this point I suspect a house power flux that makes a TV blink. Light bulbs do blink as well.
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Bob FlisserAuthorCommented:
Maybe a dumb question, but is it possible the laptop is going to sleep or some other low power mode? Go into the power settings and make sure the display is set to never sleep when on external power. (You probably don't want that setting for when on battery power).
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Tiras25Author Commented:
All laptop power option is on max performance.  Never sleep/dim and never turns display off.  Besides the laptop screen is always ON.   Only TV screen blinks for 2-3 sec.
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Bob FlisserAuthorCommented:
A few other possibilities I can think of.........

It sounds like you're using a Windows machine, so go into Device Manager and open the properties for the display adapter, screen (internal and external), network adapter and mouse. In the properties screens, if any of them have an option for "allow the computer to turn the device off to save power", make sure it's unchecked. This option is often separate from the general power settings.

Another possibility is that the external screen is going into low power mode, then waking up. All brands have different ways of setting options, so check its settings (instruction manual often calls it the On Screen Display or OSD) to see if that might be the case.

If none of this helps, then yeah, you might have a cable with a loose wire or maybe the HDMI adapter in either the laptop or screen is a little loose.
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Tiras25Author Commented:
I'll try those settings.  Less likely though.  Its only blink for a few seconds and very randomly.  Doesn't hurt to check anyways.  Thanks.

No adapters.  Just a straight HDMI to HDMI cable.  But could be a loose port in eiher TV or a laptop.
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Bob FlisserAuthorCommented:
If you have another computer available, attach it to the screen and see what happens. That way, you'll know if the issue is with the original computer or the screen. (Or if you have another screen available, try swapping it in.)

Good luck.
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Tiras25Author Commented:
Sorry for the late reply.  Replaced the laptop and the HDMI cable.  Will monitor few days to see if the TV still blinks.  Thanks.
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Tiras25Author Commented:
Power surge affecting TV screen to blink.
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