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testing voltage rectifier

Discussion in 'General Electronics Discussion' started by aleeeeaaa, Feb 1, 2011.

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  1. aleeeeaaa

    aleeeeaaa

    17
    0
    Jan 31, 2011
    How do you test a voltage rectifier on a tv power circuit board? Should the rectifier be removed first from the board or can it be tested on the board? The rectifer is a black plastic rectangle shape with four legs coming out of it soldered to the board. I have a digital volt meter with diode test on it. How do i go about testing it to see if it is ok
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    It's a bridge rectifier by the sounds of it. You should be able to use the diode test function between each pair of legs to test each diode within it.

    test between ~ and +, and ~ and - (there are 2 ~s, so this is 4 tests)
     
  3. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    It can usually be left in place, but if it's supplied by a transformer then it will be effectively shorted between the two ~´s. If it otherwise measures ok then it doesn't matter.
    Disconnect transformer if possible (by fuse or plug) if in doubt. You may also want to measure each diode both ways to make absolutely sure, totalling 8 measurements.
    Normal forward (red probe to -, or black probe to +) readings range between 500-700 [mV]. Reverse readings should be infinity [ol].
     
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