Hello, i have a quasar 29" standard tv and it's making this really annoying high-pitched
whistling sound, and if you
slightly scoot the tv or tap the side of it, the noise will temporarily
stop. How or can I fix this?
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Re: High pitched sound
You can fix this if you are very careful. it is call a high voltage leak. inside of the tv, close to where the power comes in will be what is called a high voltage transformer. if you are electrically inclined, unplug the tv, take the back off and then hook the power line up and turn the tv on. with the lights off in the room and a flashlight handy, look at where the sound is coming from. locate where the sound is coming from and look very carefully(very carefull not to touch with your hands or head to any part) for a white-ish blue arc of electricity. if you can see this then that is where the problem is. to fix it you will need to put something in between the two places that it is arcing from. a piece of plastic or silicon putty or anything non-conductive will work. again, be very careful or you might get the dogsnot shocked out you.
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If the fuse is intact in all probability the power supply unit is OK. If your Horizontal Output Transistor fails you will hear a high pitch whistling sound . Any way its the black three legged device mounted on an aluminum heat sink near a transformer from which a Red wire goes to the top of the picture tube.
The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply.
Assuming there is no deflection and no High Voltage , you either have a low voltage power supply problem, bad startup circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.
Check for bad fuses.
(If you have High Voltage as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).
Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
If there is voltage and no deflection (no high pitched whine and no High Voltage), you probably have a startup problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osillator. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate.
Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for startup problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself). See the section: Bypassing the Startup Circuit for details.
If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage. Hope this help
Is this a tube tv?IF it is the Flyback tranformer have a little still bar tranformer hight current volt make that noise take off the tv cover put some glue on the little steal bar should stop the noise or lower it very good.
If after trying the TV again later and problem persist, repairs are in order.
A high pitched whine is an indication of a fault at the horizontal section of your TV. The horizontal provides the high voltage for the picture tube.
Your best bet maybe to seek the services of a qualified professional TV repairman since this involves component level repair, soldering/desoldering, use of soldering iron and VOM (testers) and knowledge of circuitry.
Good luck and kind regards.
The high pitch sound could have been the flyback transformer. check the horzontal output transsitor if is gone the tranfomer is sure to be gone . Tranformers are varying in price are the transistors can also vary you could be looking at around 150.00 plus labour.