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Diode help

Discussion in 'General Electronics Discussion' started by Cpv1985, Mar 5, 2017.

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  1. Cpv1985

    Cpv1985

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    Mar 5, 2017
    Hi all new here so please be gentle. I have a Polaroid led tv I'll spare you all the boring details but after some Internet research I found a problematic diode in the TV. Main question is about the numbers on these diodes as I have a few old electronic boards lay about in the shed so replaced that diode with one I found in another board the diode out the TV is numbered UF5404 I firstly replaced it with SB560 still didn't work although that diode was fine so replaced again with IN5408 tv now powers up but turns off after around 10 seconds. Does that diode have to be replaced with the exact same diode or could I use another one. Sorry if this sounds like a silly question just thought as the TV is already broke I may as well have a try. Thanks for reading.
     
  2. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    You replacement is good on reverse voltage (1000V vs 400V) and current (3A vs 3A) and forward voltage of each is 1V at 3A. But the original is a fast recovery type and the replacement is not. This could be a problem. Look for a fast recovery diode that has the reverse voltage and current at least as high as the original and a similar forward voltage.

    Bob
     
    Technician Tonny and Arouse1973 like this.
  3. Cpv1985

    Cpv1985

    2
    0
    Mar 5, 2017
    Hi Bob thank you very much for your reply with your advice I was able to find a compatible diode on an old circuit board in the shed tv is working perfectly again. (Just need to locate the remote) again thank you very much for the advice.
     
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