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21PT4443/94R NO PICTURE AND SOUND REMOTE COMMANDS OK
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
on Jul 12, 2017
No raster, No sound, No channel number
wepu, Buddy it sounds like you got a power supply problem. As you say the picture is all blue?? With no video or sound and the fact that the channel display is out is the first indication that i would guess this. Do you still have the owners manual that you got when you first got the set? Good, cause thats the only place i can think of where to look in case of service over in your part of the world as I did try!! Man I tryed but to no avail. No one has heard of this model but that dosent mean that it dos'ent exsit!.. If your a tech or know your way around solid state circuitry then you should have no problem finding the fault once you get a service manual from the service location in your owners manual. Now if your not a tech and a handy man ?? If I were you I wouldnt mess with the tv as theres over 25000 volts inside the set and i've seen it make a grown man cry. Man dont attempt the repair or troubleshooting if you dont have the right or proper tools and equipment!!! Good Luck
on Nov 08, 2013
21PT4475 where is the fuse
Usually with these types of TVs the fuse is located on a circuit board inside, often right next to where the power cord enters through the plastic case of the tv. If you are not familiar with electronics, I would not recommend replacing the fuse yourself, for safety reasons. See if you can get a professional to do it for you, or at least a friend that is familiar with electronic devices.
on Sep 27, 2010
Sctratch on screen
Instead of toothpaste (although it will leave TV set minty fresh) go to your local glass shop. You know the place; where they replace windshields and sell windows and mirrors. They will have a powder polish that you can use and might only charge you a small fee for a small amount. You might find it at a local jeweler as well. Ask for "jewelers rouge" or "polishing rouge". Mix it one part to one part water and one part glycerin and use the polishing wheel on a roto-tool (Dremel).
Another product to try is an automotive polishing compound such as Dupont 7.
Of course all of this is assuming that this is a glass screen and not a plastic screen on a projection TV. Remember that if the scratch is too deep no amount of polishing will remove it...
on Apr 21, 2010
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