Question about Toshiba 50HP66 50 in. Plasma Television

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Flashing boxes on screen

My toshiba tv is almost 2 years old. The last 4 months we've experienced flashing boxes that have characters, are solid, or opaque inside. The flashing boxes appear from top to bottom of the screen and are in the middle 1/3 of the screen. The boxes are small and rare about 40 or 50 vertically and 20-30 horizontally. The boxes happen to show up exactly in the same location the menu is located (if you were to turn on the tv menu). The boxes don't show up everytime, at first, but gradually show more and more and finally appear everytime we turn on the tv - but only when we turn on the tv. Also, the menu options turn into a bunch of english letters that don't spell a word, or omit letters within the word. SAT will become AT.

We use HDMI connections and have used both HDMI inputs to make sure it is not a bad connection. The symptoms so far have only happened with the input that accepts the satellite receiver signal. We have not experienced this problem with our HDMI DVD player. The satellite company says it is definetely not the satellite receiver, and the tv repair center hasn't been able to figure out (in 2 home visits and 2 shop visits) what is wrong either.

Please Help

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Hdmi splitter and hdmi switcher are different,i bought a hdmi splitter and it works perfect,see details: Amazon com MALLCROWN 3D 1080P 4 Pport Hdmi Splitter with ac power adapter...

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Regardless of what the satellite company says, I would find a way to try another satellite reciever to start with. I have seen this from cable boxes and satellite recievers many times. I have also seen this with a bad LNB, distribution amplifier, or a bad active splitter, or a bad cable, or a bad connector.

There is a data loss somewhere, and the set is seeing what we call aliasing. This is a loss of data, and it shows as blocks.

It is possible for your set have internal aliasing if there is a fault on one of the processor boards. The only way you will easily know if the problem is external or internal to the set is to try another source.

From your description, if other sources work with the set, then this strongly rules out the set. To easily know if the fault is on the input that the sat reciever uses, if possible swap the position with the DVD player.

On the sat system, a defect in the reciever, the LNB, or any LNB splitters or a relay, or a bad connector, can also cause aliasing because of a signal loss.


Jerry G.

Posted on Apr 30, 2008

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