Question about Toshiba 32AV500U 32 in. LCD HDTV

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Black screen, no picture

When you turn the TV on and listen, you hear a swish sound and then nothing....sometimes you see a flash like it wants to do something. There was sound, but after pushing the input button several times, that has disappeared, but my husband says he can get that back. Now, when we turn in on, we get same thing and then a pop sound. This TV belongs to my 84-year old mother. She denies cleaning it with anything, but we didn't see any dust at all. Could she have sprayed cleaner in the vents?

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Something wrong with the Inverter boards. Part# 75012523 cost approx $150.

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While turing on T.V., I hear a 'swish' noise but the T.V. only displays a black screen


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