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Intermittent loss of signal?

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Old 08-21-2011, 12:58 PM   #1
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Default Intermittent loss of signal?

Hello group. Awesome forum here and Iím wondering if anyone has had a similar problem to this and has found a resolution.

Problem:

When weíre watching TV (Samsung PN590550 PDP 1080P 60Hz) thru the Cable Box (TWC Scientific American), the picture goes off completely for about 5 seconds, than comes back on. The video Input port graphic comes up (HMDI-1) in the top left of screen first, like when the TV is turned on and then the pictures comes up. Audio comes up about 2 seconds later. This cause about a 7 second interruption in the show weíre watching.

This happens intermittently. Maybe once every 2-3 minutes for several hours or maybe just once or twice a night.
Sometimes it wonít happen for two or three days, then itís back. It doesnít matter which channel, HD or standard, the picture and sound cuts out.

I donít remember this happening while watching Netflix or DVDís via the HDMI 2. I would think that eliminates the DVD player, HDMI-2 port, and the TV itself.

I am assuming it could either be a HDMI-1 port problem on the TV, The HDMI cable, The cable box itself or the cable signal itself.

I have left the TV Menu onscreen choices on, and when it happens the picture goes black the menu stays on, indicating that the TV itself doesnít turn off for the menus stay on.

Time Warner Cable solution is: ďItís your TV, not our signalĒ. Iím wondering if I should have TWC change out the box before troubleshooting the HDMI input port. I know that HDMI cables are rarely bad.

Any suggestions would be appreciated.

Speedbag
Samsung Plasma 59in PDP 1080P 60Hz via HDMI I input
Bose Cinemate seris II Audio
Samsung BD D6500 BD 3D DVD via HDMI II input.
Scientific Ameriican Cable Box
Time Warner Cable Service
Harmony Multi-function remote
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Old 08-21-2011, 11:02 PM   #2
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Quote:
Originally Posted by speedbag View Post
I have left the TV Menu onscreen choices on, and when it happens the picture goes black the menu stays on, indicating that the TV itself doesnít turn off for the menus stay on.

Time Warner Cable solution is: ďItís your TV, not our signalĒ. Iím wondering if I should have TWC change out the box before troubleshooting the HDMI input port. I know that HDMI cables are rarely bad.

Any suggestions would be appreciated.

Speedbag
Samsung Plasma 59in PDP 1080P 60Hz via HDMI I input
Bose Cinemate seris II Audio
Samsung BD D6500 BD 3D DVD via HDMI II input.
Scientific Ameriican Cable Box
Time Warner Cable Service
Harmony Multi-function remote
You'd make a better cable guy than TWC seems to want to be; that's the same method I use when troubleshooting 'no pic' problems. It is either the signal having problems or the tuner in the box going out. It's obviously not a video output problem as the menus would show the same issue. I would get back on the phone and demand they come out. They are not able to actually read the signal (or all aspects of it) that is coming into your box, or the quality of the signal; this is done with our signal meters.
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Old 08-22-2011, 12:25 PM   #3
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Quote:
Originally Posted by CommTech3906 View Post
You'd make a better cable guy than TWC seems to want to be; that's the same method I use when troubleshooting 'no pic' problems. It is either the signal having problems or the tuner in the box going out. It's obviously not a video output problem as the menus would show the same issue. I would get back on the phone and demand they come out. They are not able to actually read the signal (or all aspects of it) that is coming into your box, or the quality of the signal; this is done with our signal meters.
Thanks commtech. Actually I had the TV menu onscreen, (from the TV remote) not the TWC remote menus. That is a good idea to try. I never really use the cable box remote since most "viewing" system changes (choose TV or DVD, or switch stations) is done from the Harmoney remote. Too Many people in the house so I hide most remotes....

I don't know if the "Cable Box Menus" go off or not, so I'll give that a try. Thanks!

SpeedBag
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Old 10-02-2011, 06:01 PM   #4
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Default Black Screen?

does it look like this?
http://youtu.be/UIJX3fTz7_E
I've had the cable guy come out and look at the signal and he says it's all good i.e. nothing wrong with the signal, cable, set up, etc. Also I've heard of similar complaints from people in different cities also with TWC. My boyfriend claims he's returned cable boxes 17 times before it all worked out so... I would suggest the same thing.
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Old 11-03-2011, 03:57 PM   #5
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Either weak signal or bad receiver. When you see your HDMI1 signal coming up, this means that your tv is seeing a signal again from the receiver. Maybe the Mpeg converter overheating, therefor not ouputing, or the mpeg converter not getting a signal and cant ouput. GL
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Old 04-23-2014, 12:05 PM   #6
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Default Probable culprit for this and other HDMI problems

I found this post when searching for intermittent HDMI blank screens and wanted to post a possible theory for the problem, as well as a possible semi-cure.

As a tech person, I look for common symptoms, or issues that can be eliminated as causes. I have had the blank screen problem with my HDMI Samsung TV. (screen blanks for 5 seconds, then comes back. Eventually after several weeks, HDMI will quit working completely)

What alerted me to a pervasive HDMI related problem, is because my PC STARTED DOING THE SAME THING. I have Dell with a video card with HDMI out, and a Hanns-G monitor with HDMI. After connecting the HDMI output, I began experiencing the same bizarre behavior that occurred on my hidef TV screen.

The temporary cure for BOTH PROBLEMS IS TO DISCONNECT THE HDMI CABLE AND RECONNECT. After doing the cable reconnect, the problem disappears for hours or days. Eventually the problem returns, but a simple cable disconnect gets me back to square one.

So, what could cause this kind of problem, across a myriad of devices, PC's and TV's, and be cured by one universal tactic? (note: simply turning off the devices or rebooting does not work. The actual cable must be disconnected)

I was then reminded of another bizarre symptom I experienced with a Microsoft keyboard, that caused certain keys to stop working over time. Banging on the keyboard in frustration seemed to fix the problem. (sort of like the old adage of kicking the vending machine)

Luckily, some enterprising person discovered that the Microsoft keyboard problem was caused by a buildup of STATIC ELECTRICITY, which is a natural byproduct of the charges moving from one device to another. The "cure" was to bang the back of the keyboard in a certain place to dissipate the static charge. This also confirmed a suspicion that my keyboard (and monitor) problems seem worse in the winter or dry periods. (hence, more static)

So, I propose that this HDMI problem may be an issue of static charge buildup, which can affect a large number of different devices. The act of disconnecting the cables discharges the cable and allows a temporary reprieve, until charges, once again, build up.

I would love to see some other techies explore this possibility. Good luck.
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Old 04-24-2014, 12:48 PM   #7
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It could also be due to something overheating, if the cable box is inside an entertainment center, or on top of or below some other piece of equipment then it could be overheating.

If this is the case then try it outside the entertainment center on a box or other stand and see what happens, or blow a desk fan on it and see what gives.

If the problem goes away then you need some space between the bottom of the box and another equipment.

I sometimes have to use 1"x 2" piece's of wood 8" to 12" long, and painted black to get the air flowing.

My entertainment center is designed with fan's built in to provide air flow.

The HDTV can also have an overheating problem if it is inside an entertainment center that has restricted the air flow.
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