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Re: fuse keeps blowing
NEVER EVER replace a fuse and think that va fuse will blow all by itself. The fuses are there to protect the set from catching on fire incase theres a short inside the set. Now in some cases an intermittant short can work after you replace the fuse but if its burnt black or brownish, theres a short inside the set in one of the circuits. always use a 100 watt light bulb across a blown fuse if your not sure if there is a short. if there is, the light will absorb the short and glow bright. if there is no short the bulb will glow bright , then go down very dim. you could have a main power supply problem, such as shorted bridge rectifyers,shorted main b+ capacitor, Hot could be shorted, or the Vertical or audio output IC could be shorted
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Re: fuse keeps blowing
Techman seems to have covered it up nicely. A fuse repeatedly blowing indicates a major short in the Circuits. Get professional help. If u are a techie, or a Semi techie, you could check the Rectifier diodes and the Power Supply regulator (STR).
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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.
Check power supply transisters possible shorted
and check transister next to ht runs picture may be shorted also check diodes 4off runs ac to dc
changover , this possible causes the fuse to blow , allways be carefull when pluging any
electrical item in
please let me know how you go thanks jeff..........
The components you have replaced fixed a short in the circuit which caused the fuse to blow. A different component is still causing problems. The components you replaced may have failed in a different way so as not to blow the fuse or you are close to fixing the problem. It could be a high voltage component failure or worse a picture tube failure.
I had a similar problem, in that I could not find the proper fuse for my set. I bought a bit higher amp fuse from Radio Shack and it ended up blowing a couple months later. I've since pulled the TV down and replaced it with an LCD set, so I've solved my problem.
But, to address yours, I don't think the amp difference would not be the problem. Likely, there is a power issue on your set causing it to draw more amps and become out of specification. Using a higher amp fuse would buy you more 'capacity', but if its blowing those too (repeatedly), its likely a real problem in the set. I'm not a TV technician, so I can't tell you why. I'd suggest taking the thing in for service (cheaper than the house call) or if that is too expensive, looking at putting your money into a set that won't give you those problems. Or, just keep replacing the fuse until it doesn't fix the problem.
Assuming you are absolutely sure the TV is getting power,
If you have an ohmmeter, measure the resistance between the two prongs
on its plug. If no conductivity (over 1 meg Ohm) the fuse inside
is popped. Take the cover off, look in the area near the
power cord, it is the usual 5AG type (glass cylinder) fuse.
If you replace it and it pops again then measure all the diodes in the
rectifier circuit (near the fuse).
Many times power transients will just blow these input power
devices. However, many times it will go much deeper and get
the TV's processor brain. If the TV is anywhere near 10 years
old, I wouldn't go any deeper than the input power circuit.
If you look on the board that the fuse sits on you will see printed it states 6amp 125 Volt / 3amp 250Volt. This means that you can use either one. I think that is why the fuse states E.6.3 125Volt... I think it means either 6 amp (125 Volt) or 3 amp (250 volt). I noticed on the back of a fuse package that I bought that it stated these were interchangable so I put two and two together.