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Re: the tv keeps blowing fuses
Hi your problem is that a component(s) inside your TV has probably short circuited to Earth, this then causes a massive current to flow and this blows the fuse.
Due to the types of Component failure from this, this TV should go to a reputable repair shop. Get a firm "Quote" and an explanation of what needs to be done.
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on the power board you will see a black flat ac converter with this on it + ~ ~ - on it check this with a meter its more than likely to have gone as its the first thing to go in a storm. the + and - can be the other way round ~ ~ is the mains volts in and + - is the volts out if the ~ ~ has no resistance it has blown and it will keep blowing the fuse check the + - and you should have a resistance from the rest of the power board.
hi. I had the same problem and to fix it you need to take printers right-side cover off. Underneath you'll find a Power Supply Board - hidden under metal cover. Take it out and disconnect two cables from it. Now, I had to replace an fuse 125V 4A and varistor E241AD 83P on the Power Supply Board in mine HL-2140. It works fine now.
Note: I could not find the exact replacements in electronic store so I used:
- fuse: 250V 4A
- varistor: FNR 10K241 (241 is the important number)
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.
WE just bought fuses at the local radio shack. Ours were 4A 125V. You can look up your fuses on thier website to see if they carry them or just take one of your old ones with you. Hope you find what you are looking for.
There are a couple of things you could check on this one if you have the equipment and are somewhat skilled in electronics.
Take a test meter if you have one, if not try the local radio shack. Unplug the set and remove the back. Locate F802 a small pico fuse in the SMPS 4a/125v. Test this for open - if open replace it...
Next locate Q472 ( 2SC1740 ) a common NPN amp transistor which will cross to NTE85 in a pinch. This transistor is in the shutdown circuit and if it's failed usually causes the conditions you have there..
Try at least these, and if anything here sounds the slightest complicated take it to a shop - it should be a rather inexpensive repair...