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Car TV Monitor, Blown fuse

Discussion in 'Troubleshooting and Repair' started by Rick79, Aug 27, 2017.

  1. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    I have two Pyle Brand TV monitors and one of them recently blown its fuse. I tried the fuse from the other monitor to see if it just needed a new fuse, but it blew that one two. I checked the wires and looked around the board for any shorts and I noticed the diode is reading bad. My question is, can a bad diode cause the fuse to blow? Would that be the only component that would most likely fail? I only have a multimeter so i can't test the capacitors.
     

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  2. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    The diode is often wired across the supply lines to form a deliberate short in the event of wrong polarity connection. You can snip one end of the diode out of circuit to test that the rest of it still works as it should.

    Ideally, and to restore safety, you should replace the diode.
     
  3. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    Thank you! Can you tell by the photo what kind of diode that is?
     
  4. Bluejets

    Bluejets

    3,504
    709
    Oct 5, 2014
    Read the number when you snip it to test out of circuit then Google.
     
  5. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    I cut one end of the diode and tried another fuse, but it blew again.
    I saw that i can disconnect the fuse boxes from the cable, so I swapped fuse boxes with the other one and then the fuse blew on that one too. I knew that box was good, so using continuity on the meter, i found out the cable has a short. Great
     
  6. Bluejets

    Bluejets

    3,504
    709
    Oct 5, 2014
    Bit of a tip when you have a known short somewhere you are trying to eliminate. Instead of blowing fuses continually, place a bulb in series. In your instance about 10w. When bulb is bright, short still present.
     
  7. Rick79

    Rick79

    268
    3
    Nov 26, 2014
    Thanks
     
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