OEC Ti 29W Z52N' IC in Beats Pill is getting heated like anything after connecting charger

Discussion in 'Technical Repair' started by shikhar623, Sep 20, 2016.

  1. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    My Beats pill Bluetooth speakers stopped working suddenly one day. I opened them up. Disconnected the liPo batteries. Then I used new batteries but no luck . Internals have No visible damages as such. But one thing I noticed is whenever I connect micro usb charger the 'OEC ti 29w z52n' ic gets super hot. I don't know what this IC is for. Can anybody tell why is this happening and what could be the possible Solution. I have a fair understanding of amplifiers and electronics.
    Link of the pic for reference.
    https://drive.google.com/file/d/0B5y9SOyTSfoSZTNNbFR3dGxsVFU/view
     
  2. JoeJester

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    Apr 26, 2005
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    Attach your picture to the thread. I don't travel to parts unknown.
     
  3. wayneh

    Expert

    Sep 9, 2010
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    Have you asked Beats if they"ll fix or replace it?
     
  4. shikhar623

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    May 9, 2009
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    IMG_20160909_002458.jpg IMG_20160908_234625.jpg o IMG_20160925_200044.jpg in IMG_20160908_234625.jpg IMG_20160909_002458.jpg these are pictures of both the sides. Let me know if you want pictures of some particular.
     
  5. shikhar623

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    May 9, 2009
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    Official service is not available here. I got these as a gift.
     
  6. shikhar623

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    May 9, 2009
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  7. wayneh

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    Sep 9, 2010
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    One thing I see is the red and black power wires quite likely shorting together. Those need to be cleaned up.
     
    JoeJester likes this.
  8. JoeJester

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    Apr 26, 2005
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    I'd start where WayneH mentioned. Fix that battery connection. No strands should be stragglers.
     
  9. shikhar623

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    May 9, 2009
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    @wayneh @JoeJester I trimmed the strangling part. Same story. :( the red light blinks and the "OEC Ti 29W Z52N"
    IC heats up.
     
  10. JoeJester

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    Apr 26, 2005
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    Can you get that datasheet for the part that's overheating?

    Something is loading it down or its bad.

    Measure each pins resistance to ground. Take copious notes.

    On all pins that read a low value of ohms....close to zero, need to be traced to ensure there are no shorts to ground, except the pins that are connected to ground.
     
  11. JoeJester

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    Apr 26, 2005
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    Can you get a close-up pick of the corner where the overheated part is ... Both sides of the board using indirect lighting and no flash?
     
  12. shikhar623

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    May 9, 2009
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    I am unable to find the datasheet of this part "OEC Ti 29W Z52N".. Can you help me find it. I am attaching a pic from a different angle. the part "OEC Ti 29W Z52N" is encircled in Red
    IMG_20161003_015401.jpg  original image is below IMG_20160909_002441.jpg
     
  13. JoeJester

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    In the meantime ... Measure the resistance to ground on all pins.
     
  14. shikhar623

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    May 9, 2009
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    Ok. I will report back.
     
  15. wayneh

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    I still see some dangerously loose conductors on those power wires. They need to be immobilized or removed.
     
  16. shikhar623

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    May 9, 2009
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    I am attaching the resistance values between each pin and the Gnd(-ve input terminal). The direction of the IC assumed is shown by arrow.

    New Doc 1_1 (1).jpg


    IMG_20161012_131709.jpg
    PS: I have attended to the loose wies also.
     
    Last edited: Oct 12, 2016
  17. JoeJester

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    Apr 26, 2005
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    follow the traces of those reading low < 1 ohm to ensure they are connected to the negative wire.

    Look at pin 16 again, and ensure it meets the same reading ... not in kiloohms, but in ohms.

    If you find the trace going to another component and does not trace back to the negative wire, look closer at that component.
     
  18. shikhar623

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    May 9, 2009
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    It's 0.0 ohms. Since I used a digital multimeter It adjusted the scale automatically.
    Why is that I am not able to find any data sheet of the IC 'OEC-TI 29W Z52N'?
     
  19. JoeJester

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    ok ... I went to https://www.ifixit.com/Search?query=beats+pill

    I found this picture ...

    Beats_by_Dr__Dre_Pill_Bluetooth_Mobile_Speaker_(iSi)_-_Main_PCB_Top.jpg

    This certainly can be a Li Battery Charger. Use the attached document to further look around that circuit.

    What is the battery voltage at those two wires? I see four wires. I still think your problem is at those connections.

    I still don't like that connections .... if you have a Adapter for it ... I would remove those wires at the battery terminal and use the adapter and see if that part still gets HOT.
     
    Last edited: Oct 14, 2016
  20. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    yes the component oec-ti 29W Z52N still heats after I disconnect the battery and use it on adapter supply only.
     
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