Tip & How-To about Televison & Video

Are You In Bad Need of a Fuse?


Have you ever taken the back off an electronic piece of equipment only to find that the fuse is blown and you don't have a fuse handy?

Not to mention that a trip to the Radio Shack is miles away and this is usually the only place to get electronic parts to exact specifications.

Otherwise, getting an item like a fuse by mail could take up to a week or more and when you do get it you find that it did not make any difference at all with turning the set on.

To help out in these situations, I use a handy shortcut to the time consuming fuse problem.

Now this may seem a little unscrupulous to some, but I have tested it time and time again with no further damage to the electronic unit.

Most people have broken AC corded items around the house that have not been thrown away yet. I have found that these AC cords that were used to plug them up in the wall socket have tiny strands of copper wire in them.

I have stripped the cover off the AC cord and taken only one strand of the tiny copper wire and tested it to be about 5 to 6 amps which this ampage is usually what most electronic units have as fuses on the AC input.

I wrap the single strand of copper wire around the blown fuse as a test to see if there is a short in the electronic circuit. If it blows the strand then I know there is a problem, but in a lot of cases if the unit comes on, then I know that I have only a blown fuse.

I don't leave the strand permanently, but leave it just long enough to find the proper fuse so the connection will hold properly.

Posted by on

Televison & Video Logo

Related Topics:

Related Questions:

1 Answer

vs-508r model # info, does this have a replaceable fuse and if so, where is it?

Analog Mitsubishi Rear Projection Television technology from 1986?
Most repair technicians would refer you to a museum for an archaeologist.

Here's a site from which one can request pricing:

Here's a Mitsubishi VS-508R service manual (a photocopy for $25):

Here's another xerox copy for $25:

Aside from an expensive old manual, find a handy/electronics friend, have them take the back off the set, and hunt around for something burnt in the power supply, or even a blown fuse (or both). There's not a technician alive that'll need a manual to find a blown fuse.
Back in 1986, they would have used a good old Buss fuse - probably in a fuse holder, but perhaps soldered directly to a discrete component laden PC board.

Here's a way-too-large photo of a Buss fuse (actual size is about 1 inch (2.54cm). From the intact filament in the photo, you can tell that the fuse in the photograph is still good (un-blown).
The condition of fuses can be checked with (a) continuity checker, (b) DMM (Digital MultiMeter), or (c) VOM (Volt OhmMeter). But the fuse must be withdrawn from the circuit before testing with any of the above 3 categories of meters.

Fig 1. Buss Fuse - fuse specs are engraved on the end (barely visible in this photo)

Replace a blown fuse with a fuse with identical specs.
Replacement fuses are available at Radio Shack:

Dec 12, 2011 | Mitsubishi Televison & Video

1 Answer

I put 3 brand new batteries in and it still don't start not even a light will come on. Don't know what to do please help.

I have two post for your problem. In one post you say that you have installed three new batteries in your bike. All of them have have been pulled down to completely dead but you didn't say how long it took to do this. Also, not lights or anything will work on the bike. Evidently you have a serious electrical problem to say the least. If this is the case, you should be getting a tremendous spark whenever you're trying to connect the new batteries. Look behind the triangular plate on the left side of your bike and see if the fuse panel is behind the plate. Take all the fuses out and then reconnect the battery. When you connect the battery, notice if you get a spark. If you have taken the main fuse out and you're getting a spark, you have a direct short between the battery and this fuse panel. There is only one wires that goes from the battery to the fuse block. If you don't get a spark, put the main fuse back in and then the other fuses one at the time. When you go to put one of the fuses in that creates a large spark, this is the circuit that is draining your battery. You'll need a schematic to determine what electrical equipment is on this circuit. You'll have to trouble shoot each piece of equipment to find the one that is draining your battery. When doing this test, leave the ignition switch off because you should be leaving the switch off when you're not riding the bike.

Good Luck

Sep 18, 2011 | Harley Davidson XL 1200N Nightster...

1 Answer

i have a maytag microwave that just quit. there is power to the outlet but nothing on the microwave works. do you have any suggestions

Hello, there is a fuse on the front display panel. First unplug the Microwave. Remover the screws and and the front panel. On the printed ciruct board will be a fuse rate at 2 amps. If the fuse isn't blown out. The check the HV diode. It about 1 1/2 long, it will screwed down to metal flashing, it has two pronges with two wires plung into it. Take it to a TV repairman/women have them check it. They have electronic equipment to check it. GB...stewbison

Aug 31, 2011 | Maytag Ovens

2 Answers

none of the power windows work

Hello Jstefan68,
Check the power window fuse in the under-hood power distribution center (fuse box) It should be a red 50A fuse in the corner, position #12. (See Image, taken from www.wjjeeps.com)
  • Turn off the car and remove the keys.
  • Remove the fuse and examine it.
  • If it is blown, Goto your local auto parts store and buy the replacement.
  • Install the replacement, enjoy the windows.

  • If it is not blown, or blows again immediately upon installation, you will have to perform several more checks (continuity, ground, etc.) If you are not handy, find someone who is, or take it to a shop as this is a long process...

Best of luck!

May 02, 2010 | 2004 Jeep Grand Cherokee

1 Answer

HELLO I want TV Polaroid power supply part,the part number is 860-AZO-MLT666AMH.My Tv blown up some months back and I found out the fuse T5AH/250 its gone. Please can you be of help. Thanks, Akins

sorry dont have a parts book handy.. but blown fuses usally means a big part with a heatsink behind it has shorted.

call a wholesale electronics parts house close to you and they might have it or can cross it to a stronger generic.

Oct 08, 2008 | Televison & Video

Not finding what you are looking for?

1,741 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

75311 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Cindy Wells

Level 3 Expert

5384 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions