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Mitsubishi 55857 started squealing on left audio

 
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bpschoch



Joined: 26 Dec 2007
Posts: 2

PostPosted: Wed Dec 26, 2007 7:48 pm    Post subject: Mitsubishi 55857 started squealing on left audio Reply with quote

My Mitsubishi WS55857 started to squeal on left channel. At the same time the convergence went off. I'm guessing iit's a power supply problem. Has anyone seen this before and point me in the right direction?
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Wed Dec 26, 2007 10:04 pm    Post subject: Reply with quote

Squeal is probably coincidental. Replace the 2 STK392-570's to start.
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bpschoch



Joined: 26 Dec 2007
Posts: 2

PostPosted: Wed Jan 02, 2008 1:18 am    Post subject: Reply with quote

I took the board out and it looks like an electrolytic cap must have died due to fluid on the board (near the area of the STK392-570's). Fluid has spread around so I can't tell which one yet. I'm going to check with meter when I get a chance.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Wed Jan 02, 2008 1:42 am    Post subject: Reply with quote

Fluid is from one of the picture tubes leaking. (Common on this model.) All you can do is damage control. Clean the board w/damp cloth w/warm water. Let it dry. Get as much of the coolant off as possible. Make a deflection board (Cardboard) to shield the boards. (Drip shield) In other words start looking for a new set. Look closely at the other boards to see if coolant got on them too.
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