Our Toshiba 37AV52U has started to randomly display the input selection menu screen. This has never been an issue but it seems to be happening more and more frequently as of late. The batteries in the remote control are brand new and there doesn't appear to be any type of corrosion or damage to the remote. It seems like there must be some kind of a *communication error* that tells the TV to display this screen. Once the input selection menu is displayed, it always disappears within three to five seconds. It has started happening about 2-5 times an evening (sometimes more, sometimes less) for the past few weeks. There is no clear indication of when it happens or why it happens and we have been unable to predict when it will happen again. Sometimes it will continually do it, sometimes we will go days without it malfunctioning at all. Any ideas on this one?
Main system control memory IC fault. This is a very small IC; have 8 solder terminals, and can be located very near to the main system control-chroma IC. Check and replace it. Be sure to replace it with the same number printed on it; in all respect. Otherwise, it won't go. http://electronicshelponline.blogspot.com/ Before replacing it, try a reset to this set, and then check.
There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here.
SOURCE: boxes on screen when first turned on
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.
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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.
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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.
SOURCE: Black menu-like box randomly appears, covering the picture
This is a problem with closed-captioning. What you are seeing is a closed captioning box with no captioning in it. Usually this is being accidentally transmitted by the cable company "head end". Just make sure your closed captioning function is completely turned off. if you are seeing it randomly, it may well be coming from your cable company. Is it just on certain channels?
SOURCE: if i turned ON ,
Hello,
Check for dry soldering, bulged capacitor, but if otherwise Problem is in either power supply or the Y-Sustain board.
The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.
Often there are fuses on that board - one or more. Check those.
if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.
Thanks and take care...
SOURCE: My TV screen appears for a second then turns
If the tv isn't fully shutting down. but just flashing on and off then it
sounds like a backlight supply fault.
All LCD screens have what can only be described as micro flouro lights inside the screen module.
it is possible that the power supply is faulty causing them to flash on and off every now and then. or the tubes themselves are damaged.
to confirm this..
Lay the tv down flat on its back and power up in a well lit room
get down close to the screen and look across it at a acute angle
now if the black screen looks like it is still displaying an image then it's definatley your backlights!
in which case it could be a simple fault in the power supply.
so if your feeling confident in yourself i can talk you through what to look for in the supply..but try this first and get back to me.
hope this helps,ben :-)
SOURCE: Hi I have a Toshiba 42HL196 (24" LCD TV), about
As stated by the previous expert the fault is clearly a lowering of value of a capacitor or in some cases an IC or semiconductor. You can use a heater to SIMULATE the board in different section when the set to put ON and confirm the right place to where you can checck to replace suspected capacitors.-- in TCON or worse the LCD itself.
Check this out.
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