Phillips 37MF231d/37 wierd problem

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  • truep
    Badcaps Veteran
    • Aug 2010
    • 373
    • USA
    #1

    Phillips 37MF231d/37 wierd problem

    I have this set in my bedroom and like except... every once in a while when it switches from a HD channel to a sd channel over HDMI, it goes to a green screen. If I unplug it it will come up ok. If I dont unplug it and turn off my fios STB it will show ok including the HDMI bar on screen and the DUI message on the STB. I replaced all the power supply caps with FM series panasonics ant the problem persists happens about every two weeks. I noticed the other night that the power green led will come one sometimes late at night and when I tried to power up, it came up with the green screen. The set doesn't power up all the way when the light comes (no backlite or sound) Last night i waited tor the LED to go out and turned it on and it came up fine.
    No obviously bad cap on the main board. Sound like a main board problem? Since it only happens once in a while I havent opened it up for pictures. HDNI is the only source I have in there. Any Ideas?
    Tags: None
    • Longbow
      Badcaps Veteran
      • Jun 2011
      • 623
      • USA
      #2
      Re: Phillips 37MF231d/37 wierd problem

      Originally posted by truep
      I have this set in my bedroom and like except... every once in a while when it switches from a HD channel to a sd channel over HDMI, it goes to a green screen.
      If you mean that you just changed the channel from an hd channel to an sd channel, and THEN you get green screen (no video), this sounds like typical faulty HDMI behavior.
      If I unplug it it will come up ok.
      This forces the STB and the TV to repeat the HDMI handshaking process.
      I replaced all the power supply caps with FM series panasonics
      And the rationale for doing all this work?
      the problem persists happens about every two weeks.
      Are you saying the problem improved or stayed the same? If you have another video output option like component or even direct video, try them. I'll bet this green screen stuff only happens with the HDMI connection. Post results.
      Is it plugged in?

        Comment

        • truep
          Badcaps Veteran
          • Aug 2010
          • 373
          • USA
          #3
          Re: Phillips 37MF231d/37 wierd problem

          Thanks longbow! I replaced the caps because when I got it I had 2 bad caps and it wouldn't power on. I have checked all PS voltages with my scope and there good with no ripple.
          I will try a component input and check back. The thing I find strange is the power light coming on randomly.

            Comment

            • truep
              Badcaps Veteran
              • Aug 2010
              • 373
              • USA
              #4
              Re: Phillips 37MF231d/37 wierd problem

              Tried component and it seems to do the same thing. When I switch from HD to SD I get a momentary green flash then it comes up (most of the time).

                Comment

                • PlainBill
                  Badcaps Legend
                  • Feb 2009
                  • 7034
                  • USA
                  #5
                  Re: Phillips 37MF231d/37 wierd problem

                  Check the Philips website and make sure you have the latest firmware. It's an easy upgrade.

                  PlainBill
                  For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                  Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                    • truep
                      Badcaps Veteran
                      • Aug 2010
                      • 373
                      • USA
                      #6
                      Re: Phillips 37MF231d/37 wierd problem

                      Software is the latest. I re-loaded it just to be sure.

                        Comment

                        • Longbow
                          Badcaps Veteran
                          • Jun 2011
                          • 623
                          • USA
                          #7
                          Re: Phillips 37MF231d/37 wierd problem

                          Ok, we didn't know about the bulging caps and the won't turn on symptom. That tells you a little about the overall condition of the equipment. Seems that the web is full of complaints about blown up 37MF231 sets, bad caps, etc. At this point, I think you'll need a manual to do some more serious troubleshooting.
                          Is it plugged in?

                            Comment

                            • truep
                              Badcaps Veteran
                              • Aug 2010
                              • 373
                              • USA
                              #8
                              Re: Phillips 37MF231d/37 wierd problem

                              Turns out one of the caps I replaced had gone bad! I lived with the problem until it started failing regularly. This time the scope showed a lot of ripple on the 16V line. It seems to be fine now, after I replaced the cap on that line.

                                Comment

                                • multimeter
                                  Badcaps Veteran
                                  • Jan 2011
                                  • 739
                                  • united kingdom
                                  #9
                                  Re: Phillips 37MF231d/37 wierd problem

                                  Originally posted by truep
                                  Turns out one of the caps I replaced had gone bad! I lived with the problem until it started failing regularly. This time the scope showed a lot of ripple on the 16V line. It seems to be fine now, after I replaced the cap on that line.
                                  you replaced the cap with a panny fm the 1st time?,and it failed again?,did you check the voltage of the old cap and matched voltage or went higher?never known a panny fm to fail that quick!,oh well you live and learn..,i would have put the fm cap as less voltage than the one you replaced,hence the quick failure rate
                                  fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                                  ----------------------------------------------
                                  please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271
                                      #10
                                      Re: Phillips 37MF231d/37 wierd problem

                                      Also, where did you buy the Panasonic FM cap from? Digikey? Mouser? Ebay?
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                                        Comment

                                        • truep
                                          Badcaps Veteran
                                          • Aug 2010
                                          • 373
                                          • USA
                                          #11
                                          Re: Phillips 37MF231d/37 wierd problem

                                          I had the caps in stock from a digikey purchase some time ago. The cap had a bad lead, it pulled right out!. It was in parallel with another one.

                                            Comment

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