Dell E177FPf chirps

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  • FuriousCaps
    New Member
    • Dec 2010
    • 3
    #1

    Dell E177FPf chirps

    I've taken the unit apart and can clearly see at least 4 caps are bulging. I have not replaced those yet because I am curious about an observation I made.

    When the ribbon cable to the LCD is plugged in the power light blinks and there is a chirping sound that repeats at each blink (sound like a friendly version of a movie laser blast almost). With the ribbon cable unplugged the power board will turn on solidly. Should I start by replacing the bulging caps or is the chirp problem likely something else?

    I'm not sure what voltages, etc to check but I've read the notes from the other E177FPf thread: https://www.badcaps.net/forum/showth...hlight=e177fpf

    I'm showing solid voltages across U850 and U802 the amount of which of course depends on which pins are checked.

    *If you reference the picture the bulging caps are C864, C869 (470uf 25v), C862 (1000uf, 25v), C1 (220uf, 25v). 864, 869, & 862 are the three barrel caps straight up from the big blue 450v cap. The other is on the left side.
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Dell E177FPf chirps

      Originally posted by FuriousCaps
      I've taken the unit apart and can clearly see at least 4 caps are bulging. I have not replaced those yet because I am curious about an observation I made.

      Should I start by replacing the bulging caps or is the chirp problem likely something else?
      Start by replacing ALL the caps first. I count 10 capacitors not including the big one. The big one rarely, but not never, fails.

      Since 4 out of the 10 caps obviously failed, it would not be a stretch to think the other 6 are near their useful life.

      Caps don't have to be bloated to be bad. They can be out of uF tolerance (1000uF measures 25 uF) or have high ESR (ohms). Caps also dry out from heat.

      Use low ESR caps from this list ...

      https://www.badcaps.net/forum/showthread.php?t=2280

      You can buy them from here to support this site or big distributors like digikey, mouser, etc.
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        Comment

        • jetadm123
          Badcaps Legend
          • Feb 2010
          • 2169
          #3
          Re: Dell E177FPf chirps

          In the days of the caveman: bulging caps BAD!............new caps GOOD! Seriously, replace ALL the caps except for the large 450V? one (unless it's bulged or leaking) with low-esr ones like Panasonic FM or FC series available through digikey.com if you're in the USA. It should also remedy the chirping unless there are other problems you didn't mention.

            Comment

            • FuriousCaps
              New Member
              • Dec 2010
              • 3
              #4
              Re: Dell E177FPf chirps

              I don't mind buying from here and supporting the site but I can find all but 6 to buy from here. There are 12 barrel type caps on the board (two under glue). It seems like a waste of money to buy from two places since I'll have to pay shipping twice.

              The items I can't find from badcaps are 47uf 16v, 10uf 50v.

                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: Dell E177FPf chirps

                  Originally posted by FuriousCaps
                  It seems like a waste of money to buy from two places since I'll have to pay shipping twice.

                  The items I can't find from badcaps are 47uf 16v, 10uf 50v.
                  I agree with paying shipping twice. Get them for digikey or mouser. They are likely to have all your choices.
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                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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                    Comment

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