Philips 47PFL4606 No Power Fuse Keeps Blowing

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  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Boost inst back yet. But we are missing the next components so i dont know if boost can be back

    R947
    ZD907
    R966
    Q906

    Leave a comment:


  • dick_barton
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Originally posted by trunks81
    Pins 5&6 where indeed shorted ! did not see any bridges when inspecting
    Now i have an high ohm reading on those pins
    So is the boost voltage back up to +390V

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Originally posted by dick_barton
    Or it could be that pins 5 & 6 are shorted by solder when the IC was replaced.


    Edit
    Have you fitted an extra resistor along the R907, R908, R909, R911 path??
    Pins 5&6 where indeed shorted ! did not see any bridges when inspecting
    Now i have an high ohm reading on those pins

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Just a reminder, I had OP remove the R947 from the board to isolate the AUX power supply for feeding the PFC and 12V/24V circuit so we can figure why we only getting around 10V on C946.
    https://www.badcaps.net/forum/attach...9&d=1595998843

    And we also have the same problem with the 37" board, we only have 10V on C946 and the Voltage on the main cap is only a little over 300 V instead of 395V..
    Last edited by budm; 08-01-2020, 01:29 PM.

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  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Yes someone fitted an extra 18.7k resistor

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  • dick_barton
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Or it could be that pins 5 & 6 are shorted by solder when the IC was replaced.


    Edit
    Have you fitted an extra resistor along the R907, R908, R909, R911 path??
    Last edited by dick_barton; 08-01-2020, 09:04 AM.

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  • dick_barton
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    One side of R819 is connected to ground via L903 and the other side connected to ZCD. The only way it can measure such a low resisteance is that ZCD is shorted to ground or has a very low input resistance. Perhaps the 10V internal zener has gone short circuit.
    Attached Files

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  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Strangly i measure over R918 0.17ohm,And when solderd out 47K
    Attached Files

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  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Originally posted by trunks81
    D916 measure in Diode mode OK and when in resistance iam getting 8K and reverse OL
    C946 measure ESR 0.08ohm
    OK, that's fine, put them back in.

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    D916 measure in Diode mode OK and when in resistance iam getting 8K and reverse OL
    C946 measure ESR 0.08ohm

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    I want to solve the problem as much as you do, at least we get the 5V on the standby output OK.
    Try lifting one leg of the D916 then check the resistance in both directions to see what you get.
    There is not much in that 15V section of that STBY power supply, just the transfomer winding, rectifier (D916) and filter cap C946.
    BTW, did you ever test the C946 ESR?

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    I really appreciate it very much !!

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    I am still thinking, i have been staying up late here every night until 2 ~3 AM my time helping you and the other guy in Euro and I am very tire right now, I need to clear my head so I can think straight again.

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    in the mean time can i check some more components?

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    OK. I have to spend more time to figure why we are not able to get 15V on C946.

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Oke ZD907 is out, and i have 10.5V on C946
    With 1K in place ofcourse
    Last edited by trunks81; 07-31-2020, 01:44 AM.

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Originally posted by trunks81
    I did replace ZD907, when one leg un-solder iam getting 85K ohm in one direction
    OK, leave ZD907 out like that for now.
    Power up the board and see what Voltage you will get on C946 again.
    BTW, you can leave 1K resistor in place for now.

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    I did replace ZD907, when one leg un-solder iam getting 85K ohm in one direction

    Leave a comment:


  • budm
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Can you un-solder one leg of Zener diodeZD907 and check the RESISTANCE in both direction of that ZD907?
    BTW, did you replace ZD907?

    Leave a comment:


  • trunks81
    replied
    Re: Philips 47PFL4606 No Power Fuse Keeps Blowing

    Hello

    If swapped out T803 from the 47 inch to the 37,
    and swapped it back to the orginal boards again

    Leave a comment:

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