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Picture was fine sound was fine suddenly white smoke and a gentle hissing sound emerging from the top of my sharp lcd 40" can anyone diagnose the issue pls

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The white smoke - usually with a nasty smell will be a capacitor in (most likely) the power supply section. You will probably find one of the capacitor cans has a bowed and punctuered top. It's designed to fail that way with excess pressure. (If the top hadn't punctured, then the pressure would probably have blown the entire can off of its legs and made a mess on the PCB.)

Assuming it is a failed capacitor, it's probably a one-off (you'll find out!), so replace it like-for-like. Pay attention not only to the polarity and voltage rating, but make sure it is high-temperature rated (ususally 105C) and a low ESR type. Fittting a standard (non-lowESR) capacitor in a switch-mode power supply will lead to early overheating and failure.

(Obviously, if there's any detritus from the old capacitor, clean it off of the PCB first!!!) Good luck with that.

Posted on Dec 02, 2016

Testimonial: "wow well out my steady capability hands then!!! thank u for your reply you is spot on with diagnostic me main capacitor can lid has blown so I'm not able to just remove the top then?"

  • Sally Jelfs Dec 02, 2016

    The white smoke - usually with a nasty smell will be a capacitor in (most likely) the power supply section. You will probably find one of the capacitor cans has a bowed and punctuered top. It's designed to fail that way with excess pressure. (If the top hadn't punctured, then the pressure would probably have blown the entire can off of its legs and made a mess on the PCB.)



    Assuming it is a failed capacitor, it's probably a one-off (you'll find out!), so replace it like-for-like. Pay attention not only to the polarity and voltage rating, but make sure it is high-temperature rated (ususally 105C) and a low ESR type. Fittting a standard (non-lowESR) capacitor in a switch-mode power supply will lead to early overheating and failure.



    (Obviously, if there's any detritus from the old capacitor, clean it off of the PCB first!!!) Good luck with that.

  • Sally Jelfs Dec 04, 2016

    If the top has blown off or punctured, it is because a fault occurred which caused the electrolyte inside to boil. (That's fatal to the capacitor!) Hence the white smoke. The capacitor may have failed on its own, in which case replacing it will fix the problem. But, if it was caused by some other component failure causing over-voltage or reverse voltage then it will quickly blow again. If this is the case, then you'll need more local hands-on help to find the root cause.

    (For others: had it been black smoke, it would most likely be a resistor or semiconductor toasting. That would be beyond the capability of this forum to easily diagnose.)

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