Question about Astar LTV-2701 27 in. HD-Ready LCD Television

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Quick Question about power supply high pitch noise

I repaired the power supply but one of transformer (PQ32/30 40117) is making a squealing noise, it's that normal? Thanks.

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  • casimec Nov 19, 2008

    I replaced
    (4) 3300uf 35v
    (6) 1000uf 10v
    (3) 2200uf 25v
    (3) 100uf 450v
    There are (1) 1000uf 50v and (1) 2200uf 35v That I didn't replaced because the looked good and not bulged or leaking.



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That noise should not be normal unless it was there from its new condition. That noise seems to be there when the circuit is demanding higher current from the power supply and the transformer is trying to keep up with the demand.
How many capacitors did you replace?

Posted on Nov 19, 2008

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