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Need A Lot Of Help

Discussion in 'Troubleshooting and Repair' started by blueeyes, Dec 13, 2018.

  1. blueeyes

    blueeyes

    15
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    Dec 13, 2018
    Hi guys sorry for my first thread I am an OAP and have always dabbled with things and fixed a few things in the past but electronics has always intrigued me, so when an old friend asked me to look at this item for him I agreed lol, it is basically a small mp3 player with micro sd card that is controlled by a remote control for changing sounds and swithching on and off, anyway he said it got slightly wet but as it is shower proof thought nothing of it till a week later when it would only turn on via internal switch ( led lights up) but no sound, I have opened it up and had a look for anything jumping out at me but nothing apart from a small mark on the board , the remote seems to be fine but it is as if the unit isnt receiving the signal , I would love to be able to sort this for him but if not within my DIY skills would pay for a repair as my old friend has done a lot for me in the past but havnt a clue where to start I have a multi-meter and know couple of basics and thats about it so any advice or input guys would be vert welcome and dont be shy I dont mind the truth lol many thanks for taking the time to read this 20181213_105937.jpg 20181213_110017.jpg 20181213_110340.jpg
     
  2. Bluejets

    Bluejets

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    Oct 5, 2014
    I'd tend to go for the SD card first up.
     
  3. blueeyes

    blueeyes

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    Dec 13, 2018
    many thanks for the reply tried the one that was in it on my comp and could open it etc and copied what was on it to another sd card and tried it but nothing , it is ment to switch on when you press a key on the remote but does not only switches on withthe small button switch inside tks
     
  4. turbogt16v

    turbogt16v

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    Mar 27, 2015
    are those some marks from water an 2 pic,
    if they are, take a good pic, top and bottom
     
  5. blueeyes

    blueeyes

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    Dec 13, 2018
    20181213_182755.jpg 20181213_182716.jpg 20181213_182924.jpg
    thanks I have took a close up of that mark on pic 3 but can take more if needed thanks PS enclosed more pics one and two are of the only area I can see marked and 3 I dont know what this is but there was a gap on the track on the opposite side which looked like old damage but bridged it and no difference so undone it
     
    Last edited: Dec 13, 2018
  6. blueeyes

    blueeyes

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    Dec 13, 2018
    PS forgot to mention this is a 12v DC system with a charging option for the 8 AA it runs off thanks
     
  7. blueeyes

    blueeyes

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    Dec 13, 2018
    Can any of you guys shed some light on this please or point me in the right direction many thanks
     
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    there appears to be a lot of corrosion around many of the IC and other component pins

    cleaning it off may cure the problem, but seriously if it was turned on and operating when it got wet,
    I wouldn't hold much hope of getting it going again
     
  9. blueeyes

    blueeyes

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    Dec 13, 2018
    my friend said it was working , it was a slight shower, and then nxt time he tried to turn it on nothing , I have found two smd resistors that give no reading either way with continuity check on the multy m well they are both marked R and a num on the board tks
     
  10. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
    2,676
    Jan 21, 2010
    When you say "no reading" do you mean they read 0, or OL? And what are the markings on the resistors (assuming they're large enough to have markings)?

    I'd probably clean the board using a flux cleaner first (or just distilled water) before drying it by dunking it in isopropyl alcohol. You do need to be careful about parts that can be damaged by either of these solvents.
     
  11. blueeyes

    blueeyes

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    Dec 13, 2018
    I mean just a 1 showing on the screen if that makes sense looks like 10u on one and a 100u on the other tks
     
  12. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
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    Jan 21, 2010
    And presumably this display of "1" is what is shown if the process are not touching anything?

    100u and 10u means these devices are capacitors.

    If you're measuring the right places I would expect you to see some readings first, before the meter settles in an over range resistance measurement.
     
  13. blueeyes

    blueeyes

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    Dec 13, 2018
    yes thats correct, they have an R and a no marked on the board nxt to them thats why i thought they were resistors hence why I need a lot of help, do I need to put power through the board to get a reading, as this is a remote controlled mp3 player up to 100 yds I take it will have a separate circuit for that etc many thanks for your input would love to get this going and learn as I go along
     
  14. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    NO!

    You always perform resistance readings with the power off.
     
  15. blueeyes

    blueeyes

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    Dec 13, 2018
    well these are small smd type caps and no readings either way with them tks
     
  16. blueeyes

    blueeyes

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    Dec 13, 2018
    it is R4 & R5 in the pic I am getting no readings from and R12 although getting a reading looks suspect but dont know what it is
     

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  17. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
    2,676
    Jan 21, 2010
    The wonder of pictures. Those are marked 104 (100kΩ) and 1004 (1MΩ).

    Your multimeter should read them easily. Are you sure that you are operating the multimeter correctly and that you are probing the right places?

    Show me a photo of your multimeter when you have it set up in the resistance range. Show one photo with the probes touching, and another with them not touching (you should get close to 0 and OL respectively).
     
  18. blueeyes

    blueeyes

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    Dec 13, 2018
    20190112_132313.jpg 20190112_132313.jpg 20190112_132220.jpg 20190112_132322.jpg Lol well thats shows how much i know here you go hope this helps pics
     
  19. BobK

    BobK

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    Jan 5, 2010
    The 2K range is the wrong range to read 100K and 1M. Try the 200K and 2M ranges.

    What Steve was asking for was to show what the meter reads with the probes shorted together and the probes connected to nothing. This would tell us what an out of range indicator looks like on your meter.

    Bob
     
  20. blueeyes

    blueeyes

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    Dec 13, 2018
    thanks Bob for the input on the 200k I get just a 1 not touching but now I am getting a reading from both R5 is reading 103 one way but just the 1 the other and R4 is giving about 96.01 both ways if this makes sense I might be barking up the wrong tree but was only searching where I could see a bit of moisture damage thanks
     
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