Magnavox 47MF437B/37

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  • K-man
    New Member
    • Feb 2015
    • 6
    • US
    #1

    Magnavox 47MF437B/37

    About 6 weeks ago, TV went out. would not turn on, made a chirping sound. Replaced the 2 zenor diodes, and 3 others. TV worked. For about a day then went back to the chirping. I bought a "standard" repair kit from LCD alternatives. (pack of capacitors & diodes) I replaced what they sent. Plugged my TV in, turned it on and heard a POP. I noticed I installed on of the capacitors, the 16v 2200 uF, backwards. Where do I go from here? Could this installation backwards cause damage to others parts......transformers, etc. Or did I fry the whole board? Cant find one anywhere online, none in stock...
    I would like to repair this TV if possible. Any help would be appreciated.
    Tags: None
    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: Magnavox 47MF437B/37

      why you could get lucky and replace the popped capacitor and all is well but usually it can do damage to other components I seen it both ways
      Did I leave the soldering iron on?

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8206
          • Canada
          #3
          Re: Magnavox 47MF437B/37

          capacitors are cheap. replace that blown one first. They do pop if installed backwards, but shouldn't fry something else. It doesn't have to be 16V cap. You can also put a 25V one, however the capacitance rating of 2200uF should be the same. Look for quality brand caps, like Nichicon PW series or Panasonic FM... good luck on the repair.

            Comment

            • K-man
              New Member
              • Feb 2015
              • 6
              • US
              #4
              Re: Magnavox 47MF437B/37

              Ok. Ill try that & post later if worked.
              Thank you

                Comment

                • K-man
                  New Member
                  • Feb 2015
                  • 6
                  • US
                  #5
                  Re: Magnavox 47MF437B/37

                  I've replaced the capacitor that blew. No difference. when plugged in, power light is red. Press it to turn on TV power button turns green. No sound or picture. Screen remains black. Any ideas what I can replace next? Was going to just buy a new power board but can't find one for this TV anywhere. Would like to repair this one.
                  Thanks again for any help.

                    Comment

                    • Terryfictv
                      Senior Member
                      • Mar 2011
                      • 124
                      • USA
                      #6
                      Re: Magnavox 47MF437B/37

                      Go to http://www.shopjimmy.com/catalogsear...q=996500045188

                      Check the parts listed and double check your installed kit parts....

                      You may need to float ( lift one leg ) of suspect parts to test accurately.

                        Comment

                        • CapLeaker
                          Leaking Member
                          • Dec 2014
                          • 8206
                          • Canada
                          #7
                          Re: Magnavox 47MF437B/37

                          Originally posted by K-man
                          I've replaced the capacitor that blew. No difference. when plugged in, power light is red. Press it to turn on TV power button turns green. No sound or picture. Screen remains black. Any ideas what I can replace next? Was going to just buy a new power board but can't find one for this TV anywhere. Would like to repair this one.
                          Thanks again for any help.
                          I think you are now due for pictures and voltage measurements on the power supply. Put the name of the pin with the voltage you measure.
                          You can also try to unplug the main board and force the PSU on and measure voltages.
                          Your standby circuit works, I am guessing that at least one of the other voltage rails is not giving anything, or a backlight problem.

                            Comment

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