Problemi s LCD kalkulatorom

Na jednom LCD kalkulatoru ne rade neki segmenti. Stavim ga na sunce, LCD displej POCRNI, vratim ga u hlad, opet posivi i radi dobro. Nakon par dana opet isto! U èemu je kvaka, koji se to procesi dogaðaju? PS: ®ao mi ga baciti, ima velike tipke i znamenke

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vaso
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