Bad caps? Phillips HiFi

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • ped90
    New Member
    • Apr 2015
    • 9
    • United Kingdom
    #1

    Bad caps? Phillips HiFi

    Hi all
    I have a Phillips hifi here which has intermittent sound. I can hear music through earphones with no problem. It also has a second station connected via wifi which works fine, but the main base station doesn't play music through the speakers. Sometimes absolutely nothing comes out. Sometimes it plays for varying lengths of time (from just a split second to a minute). I can't see any external signs of loose connections.
    I opened it up and went straight to (or what I think is) the amp board to check the caps. None of them look bulged but there looks like a resin around all the big caps which I've not seen before - almost looks like a leak or burnt..?
    Take a look at the images included. I'd love to know if it's normal or not, or if you spot anything I've missed!
    Thanks in advance!!

    Photos:
    http://1drv.ms/1Q4sZwR
    Tags: None
    • mariushm
      Badcaps Legend
      • May 2011
      • 3799
      #2
      Re: Bad caps? Phillips HiFi

      All that black stuff around the capacitors and inductors (the black round things near the light green capacitors) was a dark white/cream silicone semi-flexible material.
      As it dried out, it became black and it also started to become conductive, so it's quite possible that material causes shorts or small resistance between various components under that material.

      The initial purpose of that material was to keep the large parts in place during soldering and to prevent the parts from vibrating inside the box when you play music on that unit.

      My advice would be to carefully scrape that black crap away from the parts and the boards. Carefully is the word, you don't want to break those small surface mounted components.
      Some acetone may help soften that material.

      Once you get rid of that black crap, if you still have problems, get back to us.

        Comment

        • Behemot
          Badcaps Legend
          • Dec 2009
          • 4845
          • CZ
          #3
          Re: Bad caps? Phillips HiFi

          No image is loading there, please upload few images to the forums. All the image hostings are PoS.
          Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

          Exclusive caps, meters and more!
          Hardware Insights - power supply reviews and more!

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 30919
              • Albion
              #4
              Re: Bad caps? Phillips HiFi

              things like that could be the headfone socket switch contacts.

                Comment

                • ped90
                  New Member
                  • Apr 2015
                  • 9
                  • United Kingdom
                  #5
                  Re: Bad caps? Phillips HiFi

                  Thanks mariushm, very interesting! Is it common for the silicone to dry up like that? What could cause it?
                  Well, after a full 2 hours worth of painfully scraping and wiping with acetone (this stuff does NOT come away easily!!), I ended up breaking one of the surface mounted components clean off
                  So disappointing!
                  I've tried emailing Philips for a replacement board, but I'm pretty sure the answer will be a No!

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 30919
                      • Albion
                      #6
                      Re: Bad caps? Phillips HiFi

                      foto's of the board and part. pls
                      sounds fixable.

                        Comment

                        • ped90
                          New Member
                          • Apr 2015
                          • 9
                          • United Kingdom
                          #7
                          Re: Bad caps? Phillips HiFi

                          3 new photos added to original link..not sure I can solder something that small!

                            Comment

                            • nkeck72
                              Enthusiast
                              • Oct 2015
                              • 21
                              • USA
                              #8
                              Re: Bad caps? Phillips HiFi

                              I would attempt to resolder with a fine tipped iron... the key words here are fine tipped. Another option is to bodge on a through-hole component with the same rating and make sure it doesn't short with anything. Shorted components will create a pile of burnt-silicon-smelling rubbish.
                              Last edited by nkeck72; 11-29-2015, 01:35 PM. Reason: formatting issues
                              Cheers!

                              "It won't take long if you take it one byte at a time." - me

                              "WHOSE IDEA WAS THIS?" - too many people to count

                              "Go back to the depths of SourceForge from whence ye came."

                              All my software crap: https://www.github.com/nkeck720

                                Comment

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 30919
                                  • Albion
                                  #9
                                  Re: Bad caps? Phillips HiFi

                                  well i cant see the foto's because all m$ domains are in my blocklist.
                                  (and i'm keeping it that way on principle)

                                    Comment

                                    Previous template Next

                                    Related Topics

                                    Collapse
                                    • momaka
                                      Seasonic B12 BC-550 – barely 2 years old and with BAD CAPS already!
                                      by momaka
                                      I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.

                                      For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).

                                      https://www.badcaps.net/filedata/fetch?id=3591771


                                      https://www.badcaps.net/filedata/fetch?id=3591772

                                      It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:

                                      https://www.badcaps.net/filedata/fetch?id=359177...
                                      03-12-2025, 03:42 PM
                                    • eryjus
                                      Heathkit IO-4205 Power Supply Caps
                                      by eryjus
                                      Hello,

                                      First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.

                                      I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.

                                      I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
                                      ...
                                      05-10-2023, 11:21 AM
                                    • Paxman_Swede
                                      Identifying caps on an old Zoom 9000
                                      by Paxman_Swede
                                      Hello!

                                      I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.

                                      The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.

                                      I have studied the board and...
                                      01-14-2025, 09:51 AM
                                    • captain150
                                      Help with switching power supply caps
                                      by captain150
                                      I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
                                      I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
                                      03-16-2025, 07:34 PM
                                    • Foetuss
                                      Gigabyte GA-6OXT :: caps question
                                      by Foetuss
                                      Good evening

                                      I recently aquired a rev 1.1 Gigabyte 60XT, and was suprised of the amount of leaking caps for a motherboard of the P3 era. Especially the way the 330µf caps seems like the housing discolored even.
                                      Now, there are some 3300µF 6.3V KZG series around the CPU. Would it be OK to replace them with something like EEUFR1A332 ? (Panasonic FR 3300µF 10V). Or was this board designed around very low ESR caps?

                                      But I was also suprised about the bigger boys, which are 330µF 25V.
                                      Could it be they used 25V caps because they were cheaper / available at that time?...
                                      02-11-2025, 12:22 PM
                                    • Loading...
                                    • No more items.
                                    Working...