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Datasheet wanted for Q165A diode

Discussion in 'Datasheets, Manuals and Component Identification' started by nimiq, Nov 19, 2019.

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  1. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    Hello, I have a Panasonic TV which does not switch on. The power supply board has two diodes that appear short circuit (<1ohm either way). They are labelled Q165A and I suspect they may be transient suppression diodes as they are part of the transformer circuit. Problem is are these common cathode, common anode or what? Unless I can find out I can't really fix the board. I've not found a circuit diagram either. PCB reference is TNPA5806 which seems to be used in a number of Panasonic Viera TVs.
    Any ideas appreciated.
     
  2. bertus

    bertus Moderator

    1,020
    373
    Nov 8, 2019
    Hello,

    Is the Q165A written on the part or the board?
    I can not find anything for Q165A.
    Where is the part on the board.

    Bertus
     

    Attached Files:

  3. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    Hi Bertus,
    Thanks for replying.
    The part is on the back of the board under the large transformer to the left of the board picture. The part is marked on the case Q165A, nothing else. I think the package is DPAK, problem is the tab could be cathode or anode it may be one or two diodes internally I just can't even guess.
    Roger
     
  4. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    ...oh and the PCB is marked D7408 and D7409 (two diodes appear shorted) that's how I figured it was a diode of some sorts.
    Roger
     
  5. bertus

    bertus Moderator

    1,020
    373
    Nov 8, 2019
    Hello,

    I see more of those diodes on the back.
    Unfortunately the markings can not be read.
    I have used the pictures from this page to show:
    https://www.ebay.com/c/1271470258

    What is the type number of the TV?
    Perhaps we can find a manual with more info.

    Bertus
     

    Attached Files:

  6. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    The board is similar to mine but my D7413 and D7412 are not populated (maybe a lower power rated board).
    In the photo you've attached all the diodes look fried.
     
  7. Martaine2005

    Martaine2005

    2,933
    801
    May 12, 2015
    13756CA9-E961-4D68-909B-CBAFDDBC38A4.png
    Have a look at this.

    Martin
     
    davenn and bertus like this.
  8. Martaine2005

    Martaine2005

    2,933
    801
    May 12, 2015
    11DDAC58-C7D6-486A-A3BE-5E20A9E66C8A.png
     
    davenn likes this.
  9. Martaine2005

    Martaine2005

    2,933
    801
    May 12, 2015
    Sorry, I am on a train with only my phone. Hope the pictures help you identify the correct component.

    Martin
     
  10. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    Hi Martin,
    Thanks, that's great, I think you've cracked it. I found the circuit diagram for a similar PCB late last night (TNPA5808) and the circuit diagram symbol showed common cathode diodes on the transformer output windings (see attached filename 7 should be a 5). That ties in with the datasheet you have found.

    Many thanks to both yourself and Bertie for helping.
    Roger
     

    Attached Files:

  11. nimiq

    nimiq

    8
    2
    Jun 30, 2019
    Ha!! I had been to the alldata website but did not realize you could select mark as a filter...learn something every day.
    Thanks Martin
     
    Martaine2005 likes this.
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