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replacing the fuses with random values is prolly not a good thing...but one thing to check is a big transistor know as the HOT. This will more than likely be clipped or screwed to a heat sink NEAR the flyback (big transformer, has a wire going into the big glass tube). That causes fuses to blow...If this does not work, let me know.
That would be a 6.3 AMP fuse. If the fuse in the set is blown most likely the thermistor for the degausser is bad and needs to be replaced too. If you get me the model number of the TV I can get the part number for the thermistor. If you don't replace the thermistor then the fuse will most likely go right away or within a few days of operation. Please rate my answer. Thanks...
take the back off the tv and inspect the glass fuse off the ac power cord, it will probably be black and open, this is a common problem, it blows because the degaussing circuit works too slow, the original fuse is an 6.3 amp fuse, you need to replace it with a 6.3 amp slow blow or a 7 or 8 amp fuse to keep it from blowing, if you put an original 6.3 amp fast blow fuse in it, it will work for a while, but will blow again someday.
You will need to remove the back of the TV. Don't worry, it's not that bad.
There are 4 screws across the top, one on each side, one right next to
where the power cord goes into the back of the case, and the two more
by all of the video connections **These are the most important to
remove because they attach the main board to the back of the case.
Once you have remove the screws then the entire back of the set will
slide off. If you look where the power cord attaches to the board you
will see a small fuse. This is a 6.3 Amp 125 volt fuse. You can replace
it with a 6.3 Amp 250 volt fuse from your local Radio Shack. A four
pack costs between $3 and $5.
Make sure that you check that it works before putting it all back
together. Check for any loose connection cables while you're back
there. I found a few when I did this.
the poer supply faulty. Isolate Horizontal output stage from the power supply and connect dummy load (like normal bulb same wattage as TV ) and test. before that pls check all component in power supply and replace and burnt parts spacialy diodes caps and power regulater ic as well
means you have a part that is dead shorted after the line fuse, usually a bridge diode, regulator IC or possibly the Horizontal output transistor. Not really something a non tech will be able to find, a volt Ohm meter is required as well as soldering equipment.
Tv keeps blowing fuses
it is due to short ckt in your tv in
1 power supply.
2 horl output section
it is mainly due to
1 switching transistr
2 main fil cap
3 rectifier diodes
4 print short
5 h/output tra.
6 eht transformer
I'm not sure how to help you with this one as the unit you describe does not match the one listed in the thread. You talk about a WTV1903 TV but a Sony KV-27S42 is listed. One thing is for sure no matter which model you have you should never exceed the manufacturers rating for the fuse (which is not meantioned). You stated that a 4 amp fuse (12V) blew so you put in a 5 amp. You never raise the fuse rating. Larger means more current draw and the possibility of a fire. First put the correct size fuse in. It should be listed on the circuit board or in your literature. If the picture is dark either the CRT is bad or the High Voltage or screen drive is low or both. The fact that it is blowing fuses indicates that something is not working properly. You need to check the CRT with a tester. If good, check the High Voltage for the correct value. If this is good you could have a partially shorted flyback. If you are not qualified to work on these circuits, (they are dangerous) have a qualified tech do it. Good luck and don't put larger fuses in in the future!