Question about Toshiba 50HP66 50 in. Plasma Television

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Boxes on screen when first turned on

We have switched the satellite physical input with the DVD input, to see if it was just the physical input, but the DVD player is fine on either HDMI 1 or 2; however, the satellite whether on HDMI 1 or HDMI 2 still shows these boxes. I also hooked the satellite to a video input to see if it would show the boxes and after six sporadic tries of turning the tv on through out the day, I didn't get the boxes. However, it seems that the symptoms take a while and then gradually get worse. When we first switched the satellite from HDMI 1 to HDMI 2, it took two days before we saw the boxes and now it is regular. (weird)

The boxes overlay the picture. The picture is in no way compromised, besides being overlain with boxes (like picture in picture, without the picture and being in middle of the screen). The boxes only appear when first turned on. They don't appear after 10 minutes or an hour of watching tv. They don't appear every time it is turned on, but does get worse as time goes on. Since we've been messing with it and not really using it (since it has been in the repair shop), the boxes were not showing that much, but now that it has been a week out of the repair shop, they show almost every time we turn on the tv.

We have also tried turning on the tv before turning on the satellite, but that doesn't work. The boxes still appear. however, it appears there is still a feed from the satellite even though it is turned off because there is a screen saver in the background flashing all over the screen behind the boxes.

In order to get the boxes off the screen, I have to select the "input" button on the remote control and the boxes line by line will disappear. That is the only way besides unplugging the tv or unplugging the satellite receiver from the tv, to get the boxes off the screen. Also, the "menu" or other buttons don't work when the boxes are on the screen, the only button that works is the "input" button. Once the boxes clear, the menu button does work, but the menu, or display may be garbled letters (doesn't do that 100% of the time).

The tv repair guy replaced the scaler, digital and controller boards since that is what they diagnosed when they came to our house. However, that hasn't solved the problem. He did see the problem.

Would the bad satellite receiver, LNB, cable, etc also contribute to the menu being all garbled?

I have photos but they are too large to upload here.

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  • Toshiba Master
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What is very interesting about digital video is that it works with memory, sampling, and clock cycles. If any parameter is off specs to the point where the correction routines cannot interpolate the data there will be errors shown. When these types of problems happen the effect can be unstable. There are many factors that can contribute to these errors.

What is also interesting with digital video, is that the error factors and characteristics can change with the content and with the change of content. When there is more than the average data to process, delays can be introduced.

I know exactly what you are talking about. I have seen aliasing many times with digital transmission and processing equipment.

If the processor boards in the TV set have been changed, logicaly this should normaly rule out any problems with the set. It would be a very big coincidence that the new boards have the same defects as the old ones.

If you can play your DVD's using the HDMI cable in to the same input where the sat was, and there was no visible fault, you know for sure that the fault is not with the TV set!

I would guess you even swapped HDMI cables around to rule these out as well?

If you have a set of A/V component cables, and your sat box and TV set has the component option, you can test the component input of your set from the sat box. This will still be able to be HD, but it will be analog between the box and the TV. This may point ot something later on if there is still a fault.

Many times over the years, I have seen intermittant faults with cable boxes and satellite systems. Anything is possible with these.
__

The simplist sat system has basicaly the following components:

Dish and LNB located outside.

A cable that runs in to the house that has CATV connectors on each end. The connector on the outside must be the waterproof type.

There will be two cable runs on some systems for a double LNB, or there can be 2 LNB's on a sophisticated system.

On the inside of the home, depending on the system there will be an A/B relay for the Horiz and Vert polarization for the signal being recieved. In a single wire system, this relay can be built in to the LNB.

Then there is the necessary cable feed with connectors to the TV sat docoder box.

If there is a shared system, then there will be a distribution system, and possibly multiple A/B relays, depending on the type of system.
__

What I am pointing out here, is that there are many parts of the sat system that can degrade the signal. I would start with the most simple, and that is trying a new box.

Ask your sat company or your dealer if they will give you a loan of a box to try.

Also, a professional sat system installer who has a spectrum analyser and knows what he is doing, can check out the system from end to end to see if there is any signal losses up to the decoder box. The next step is to try parts in order to locate any failures.

Here is another approach. If you have a neighbor or friend that is on the same sat service as you are, ask him if you guys can swap sat boxes for a few days just to see what happens. If he gets your problems, and you are okay with his sat box, this rules out the sat box totaly!

For your sat system, you can go to to the dish and make sure that the connector is screwed on securly. You can remove it to see if the center contact is okay, and also see if there is any sign of corrosion inside the conntector. Corrosion means water was leaking in.

You can follow through to make sure all the connections are okay. You will not be able to test anything without being able to substitute the parts, or have the equipment to take measurements.

Personaly, I am betting on a fault with the satellite system, and not the TV set!


Jerry G.

Posted on Apr 30, 2008

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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.

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