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How to remove D-Protection on LG Home theater

Discussion in 'General Electronics Discussion' started by Enoch, Oct 1, 2018.

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  1. Enoch

    Enoch

    1
    0
    Oct 1, 2018
    I have being using my LG Home theater for close to a year now. But unfortunately this night my wife was looking movies, she switched it off and later when we tried to put it on again, its come on and few Seconds later it show D-PROTECTION.

    Please help me to remove the D-PROTECTION on my DVD LG Home Theater LHD655

    NO SIGN OF BURNING
     

    Attached Files:

  2. dave9

    dave9

    1,154
    311
    Mar 5, 2017
    D-Prot appears to be a generic error message that does not indicate a single cause. I'd unplug it from the wall outlet then turn on to see if it goes away, otherwise opening the unit and looking for faults, or is that what you did when you wrote "no sign of burning"? Did you also look for failed capacitors, domed on top or leaking?

    Since this is a DVD and amp all in one, I would look closer at the amp portion first, though for the power rating and size it is probably a class D amp which can be a little more work to reverse engineer and trace the circuit. That might begin with determining the amp chip and getting the datasheet, then measuring signal to its input pins, signal out of its output, and power input.

    If there is an active protection circuit as there seems to be, it may have shut down the output so you could look for shorts including output transistors if the amp chip does not have that last stage of transistors built in.
     
    Herve and Enoch like this.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Herve likes this.
  4. Sunnysky

    Sunnysky

    490
    128
    Jul 15, 2016
    Factory reset= hold down zero key on remote and Then Stop button on unit for 5 sec without a disc inside
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    11,976
    2,805
    Nov 17, 2011
    It is worth a try.
     
  6. Marcus111

    Marcus111

    1
    0
    Oct 3, 2021
    I have tried factory reset but still the d protection is still there
    How can I get rid of it somebody please help
     
  7. davenn

    davenn Moderator

    13,940
    1,984
    Sep 5, 2009

    replace the main board as suggested earlier in the thread
     
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