I have a 2007 Samsung Plasma TV that has a pixelated picture on startup and once made a high pitched scream that made my small son scream in terror. The TV will keep restarting until the picture is ok. It's taking many more startups for picture to come in correctly. I have unplugged and jiggled wires. I've unplugged the tv from the wall, thinking it was static buildup - to no avail. Can anyone help me? I can't afford a new one already!
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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
The pixelation is probably caused by MPEG2 compression on the DVD and Virgin media video streams, the blur is probably caused becasue you are displaying a standard definition signal on a high definition TV.
However if a high-def source still has these problems then you may have a faulty TV, your best bet is too hook up a high-def source such as a HD/Blu-ray player or PS3/360 games console.
Should a high-def source look ok, then you may have some look changing the display settings on the TV to try and improve picture sharpness and color balance.
The Magnavox 27MS343S is a standard analog 27" TV. It is not high definition and therefore cannot generate a posterized or pixelated picture. I will bet you are using a digital cable box or satellite reveiver and the problem is in that box, not the TV. Hook up a regular VCR to the TV, set the TV to channel 3, put in a good pre-recorded tape and hit PLAY. If the tape plays nice and clear on the TV, the problem is in your digital box.
If you mean the picture froze or formed fuzzy pixelated picture and crackling, this will be due to a poor aerial signal to the tv, but if you mean the screen rolls with pink/white patchwork type squares and shows the picture in the background, all be it fuzzy, then that's the same fault as I am getting and have had to report the fault to LG as I am on my second TV.
If it is the problem mentioned in the first sentence, it is happening to our friends in OS and they have been told by specialist aerial fitters, the signal is too weak for the tv.
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