Question about Sansui COM3101 13" TV/VCR

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Screen turns black except for one inch around the outer edge

It happens after the tv had been on for 15 min. You can push almost any button and it goes away for about 5 sec. The orginal picture can still be seen around the edge during the black out. Can you help.
Thanks

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Use the tv/cap/text button to turn off the text box function of the closed captioning.

Posted on Feb 06, 2009

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Dark shaded square area in center of tv picture - how do I get rid of it? I am at mothers and she has what looks like a 36 inch tabletop JVC tube tv probably about 10 plus years old. not able to remove tv...


I have heard complaints from some of my customers, “There is a black/gray box on my television, but I can still see the picture around the edges”. This happens to all of us and is a common symptom and can be fixed very easily. If you have a black/grey box in the picture, on the older sets they would be perfectly centered on the screen, but, on some of the newer sets the black/grey box can be in different places and can be different sizes on different sets.
Most likely the Text mode is on in the Closed Caption menu.
The way you can test if it is in Closed Caption Text mode, when you change the channels, the black/ gray box will not appear right away but it will take some time to show back up. This is a very good indication that the Closed Caption “Text” mode is turned on for your television. It just needs to be turned off.
To turn off the closed caption go into your menu and turn off closed caption (CC). This will vary from manufacture to manufacture; it should be in the options menu.
I have seen on some sets like Mitsubishi puts it under the Video adjustments button. So you may have to look around for it.
You may even have a CC button on your remote, which will make it much easier. Just press the CC button until the display indicates that CC it is off.
I hope that this tip helps you and that you enjoy your televisions for years to come.
Thanks for using FixYa
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I have a 58 inch plasma and my TV has started blacking out. When I turn it on the TV operates fine. After about 20 min the screen will black out but you can still hear the sound. The sleep setting is...


The fault you describe (the unit blacks out after it heats up) suggests that there is either a bad solder contact on one or more components or connectors inside the TV or partial damage to some semiconductor (or other) device(s) in the video section or the power supply for that section (since the sound remains functional, you probably don't need to look into that).

This could be a voltage regulator, a power transistor, possibly also other things like diodes, capacitors, resistors, inductors, connectors (actually, just about anything).

See if any of the circuit boards looks darker / brownish / burned around any components (check both sides), these are the areas that are the most likely to have a bad (partially desoldered) contact.

If there are mostly surface mount components, the solder around pins may look somewhat dull, oxydized and wrinkled. Also, it's harder to spot bad solder contacts on the surface mount components than on the thru-hole mount components.

Anyway, a good solder contact is clean, normally shiny, and the solder is more or less equally distributed around the component pin right to the edge of the solder tab.

A bad contact will many times show as a thin, dull grey ring in the solder around the component pin, some halfway between the pin and the outer edge of the solder tab.

Some of these can be difficult to spot, so you may need a good light source and possibly, a magnifying lens. Many times, there is very little or (almost) no change in the colour of the circuit board around these (they didn't heat up much yet).

The bad ones are easier to see, as the ring is more pronounced and if you grasp the pin with a pair of tweezers and move it around a bit, you'll see that the ring is actually a crack already, also the circuit board has probably changed to a darker colour around these.

The really bad ones are the easiest to find, the crack is readily visible or worse, the pin is (almost) entirely desoldered by heat, and the circuit board has clearly become brown(ish) around the solder tabs.

To fix this, remove the old solder with a solder pump, clean the tab with ethyl or isopropyl alcohol and the pin with a scalpel, then resolder.

Hopefuly, if there is no real damage to any of the components (apart from some cooking), this should help, but if it doesn't then you'll need to check the components (beginning with the ones you had to resolder as they are the most probable candidates to be the cause for the malfunction).

I hope you can get your TV back to life...

Good luck

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Just use the remote to turn off the closed captioning,The button should be marked as CC or you can just go into the menu and turn it off.

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This is a convergence problem and is usually either bad connections at the convergence ICs or defective ICs. If you can solder, you can fix this yourself. Locate the convergence ICs (large black Ics attached to a heat sink and marked STKxxx). Resolder the pins first. If that fails to resolve the problem replace the ICs.

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