TV/VCR/Stereo Troubleshooting/NO VIDEO DISPLAY ON SCREEN

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QUESTION: HI

I REALLY HOPE YOU CAN HELP ME OUT BECAUSE THIS HAS REALLY FRUSTRATED ME.  I OWN A TOSHIBA LCD 57LX177.  EVERY SINCE I GOT THE TELEVISION YEARS AGO, IT'S WORKED VERY NICELY UNTIL MONTHS WHEN THIS PROBLEM STARTED HAPPENING.

I HAVE A STEREO RECEIVER HOOKED UP VIA HDMI WITH SATELLITE CABLE.  AFTER 5-10 OF VIEWING, THE SCREEN GOES BLACK AND THE MESSAGE APPEARS "NO VIDEO DISPLAY".  THE SOUND DISAPPEARS FOR A FEW SECONDS BUT IT COMES BACK.  I AM ABLE TO HEAR THE CABLE/SATELLITE SOUND BUT NO PICTURE.

I HAVE DONE SOME TROUBLESHOOTING MYSELF.  ORIGINALLY I THOUGHT THE GOOGLE INTERNET TV WAS THE ISSUE BUT I DISCONNECTED COMPLETELY AND THE PROBLEM STILL EXISTS.

I DON'T KNOW WHAT TO DO AT THIS POINT.  I HOPE IT'S NOT THE TV...

ANSWER: Yes, I agree with you hoping it is not the tv that is in trouble.

Here is my first guess:  It may be the hdmi cable has gone intermittently defective.  You can check it out by using disconnecting the hdmi feed line and use the regular a/v outputs on the sat box to the inputs on the stereo receiver.  And/or you may also just try using the internal speakers leaving the stereo amp disconnected.  Doing either of these tests will help to determine if the tv is the problem or not.  If you get good sound video when going direct or when using direct through connections.

The fact the tv gives you the "no video" is an indication that insofar as the tv thinks, it is not getting a video signal.  

After trying the above suggestions let me know if you need further assistance in getting a solution.

PS: Another check it to use a vcr or dvd to feed video into the set; if you get good video that way it points to a problem with either the hdmi cabling or connection or hookup.  If you still get the 'no video' warning under all tests it points to an internal problem.\\



---------- FOLLOW-UP ----------

QUESTION: hi,

thank you for your prompt response.  I went as far as disconnecting the receiver and connecting the satellite cable box directly to the tv hdmi port.  I still have the same problem.  what is weird, the problem occurs after watching 15-30 minutes of cable and then you get the "no video display" or it can happen a few hours later of watching television.  this is a intermittent problem.  sometimes it happens and sometimes it doesn't.

the hdmi cables are brand new so can it be something internal with the television like the circuit board?  the lamp?  etc.

I hate to spend the money to purchase another television if it's not worth fixing since the part and labor would be expensive.

Thanks.

ANSWER: The HDMI cable being "new" does not keep it from being defective.  Try wiggling the cable at both ends as if it is defective it usually happens inside the connector where the cable wires are soldered into the connector pins.

We still have not ruled out the HDMI cable.  Do you have another that you can swap out?

Yes, the set is getting old - for LCD designs, it being built in 2007, thus making it 7 years old.  And, yes, repairs at a shop will be very expensive.  If the main video board checked out as defective the cost of the board alone would be around $80 (http://www.usefulparts.com/tv-parts/lcd-tv/signal-input/digital-board-v28a000452) if you can still find one available.

You could, if you are brave, open up the set and try wiggling the connectors and cables to determine if they are intermittent.

You may, in the long run, take the set in and have it diagnosed by a Toshiba expert technician.

Hope this helps.



---------- FOLLOW-UP ----------

QUESTION: Hi,

I am still not sure what to do at this point.  I am curious to find out by trying composite cables for colorstream.  If it turns out that this doesn't have with these cables...does this mean the hdmi connectors on the tv are bad???  you suggested to change the digital board but the guys at usefulparts suggested the signal board.

Like I said...the NO VIDEO DISPLAY appears either watching cable or bluray so everything is pointing to the TV.

Thanks.

Answer
Seems the tv is a downer!  And, yes, I suppose the signal board could be the culprit. The problem with trying a new board is that if that doesn't fix the problem you are still out the cost and no solution!

One last possibility before you start changing boards:  Have you done a complete reset?  Or looked for an download/update from Toshiba?  And, has the Toshiba tech department been any help to you?  A good way to reset is unplug the power cord for at least a few hours then reboot and go through the setup procedures again.

Sometimes when doing an auto channel scan it will leave the signal processing action in a state of instability.   Doing a new channel scan will often clean it up. So, try that, also.  

TV/VCR/Stereo Troubleshooting

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cleggsan

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Consumer Electronics of all kinds. Audio, esoteric audio systems and components, video, tv. Digital equipment for consumer use. Ham radio and automotive electronics. Note: I give advice on tv repair based on general consumer electronics engineering experience but I am not engaged in actual repair of sets. MAKE SURE YOU GIVE THE MAKE AND MODEL NUMBER AND AGE OF THE SET. BE SURE TO CHECK YOUR EMAIL FOR THE RETURN ANSWER DURING THE NEXT 24 HOURS AS I TRY TO REPLY TO ALL QUESTIONS WITHIN THE SAME DAY IF NOT THE SAME HOUR.

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Electrical Engineering; recording, broadcasting, design, international standards, tv and radio theory and practice.

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