I think my TV is a DS32224 model. The screen suddenly narrow in the middle much like an hour glass. The picture is till clear, it just doesn't fill the screen anymore. I can find no setting in the menu that helps. A also reset the tv to factiry settings to no avail.
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Re: 32" TV Screen Problem
This is a pin cushoning fault. The failure is in the pin amp, and also most likely in the scan amplifier sections. The scan amps and pin amp in part of their functions work together to control the paralax of the picture scanning. They also control the dynamic focus.
To service this, you will need the training, service information, the testing tools, parts availability, and the necessary tools to follow up.
These types of faults can be complex to service, and can be a chalenge to even an experienced tech.
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I have optonica TV model CS5145A brought from mumbai in 1993. But since a couple of months TV automatically trips when I increase the contrast and decrease the brightness and the picture on the screen is not clear ..So can u suggest me which component has to be replaced?. Already i replaced the SMPS and power resister in power supply circuit.
You should get the vertical IC checked starting with checking the supply voltage on it. This is a small flat IC attached to a heat sink with about 9-11 pins. This tv model should carry an LA7837 or an equivalent IC. If supply is present, check with means of a magnifying glass for dry solder joints on it. Resolder the pins on this IC if necessary and should work out fine. Model tends to suffer from this problem.
Yes you have a problem I'm afraid in the pincussion or horizontal width circuit. These circuits usually have alot of high voltage in them and is not a safe place to be experiementing around with. Most of the time, with a problem like this, there are bad capacitors or a correction transistor has failed. If the set is over a few years buy a new one. Good Luck
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!