pcb kasi nila sablay bro
ang weird lang, kasi design flaw tapos tagal ng issue ay di parin na address. as early as 2014 pa yun unang case ko nabasa yan sa pinas e
LG rin, design flaw na kahit naka unplug yun AC mo, nag generate parin motor pag umikot elesi while cleaning. ending fried board din. buti sana if lahat naglinis ng split type alam yan
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Check nyo rin ang add-ons. May base model and top of the line din kasi mga yan parang oto. If cooling lang kelangan mo then you won't need the nano-e mosquito killer whatever model of the same capacity that sells for a couple thousands more.
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It's likely they're not properly grounded.
All power supplies have built-in voltage suppression circuits.... it's the standard. However, these circuits only work when there's a path to ground to dissipate the energy. If there's none, this surge will look for the path of least resistance... going through fragile silicon transistors and ICs until it dissipates.