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ivtec
Joined: 19 Nov 2008 Posts: 31 Location: Mass
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Posted: Fri Dec 12, 2008 1:37 am Post subject: Strde475 in protect mode |
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Can you help me with my strde475 that is in protect mode,it was working fine except the tuner, but i swapped the tuner for a good one, now i know the problem is not the tuner, i replaced all caps around UPC2581V chips on the main board where the black smoked area is , IC701 and IC702. IC701 serves the FL and SL channels while IC702 serves the FR and SR channels. Something in the vicinity must have blown as i turned on the power it smelled burned but could not see nothing burned,now nothing works and it goes in PROTECT MODE,i can't believe that i replaced all dried caps around the UPC2581 and now nothing works.any clues thanks in advance. |
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vtech
Joined: 08 May 2006 Posts: 1264 Location: USA
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Posted: Fri Dec 12, 2008 2:19 am Post subject: |
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don't ya just hate that when you are trying to fix one thing, something else craps out.
Sounds like a man-made problem though. No reason whatsoever it should go into protect mode by simply changing dried-up caps? Perhaps something was put on backwards, created a short etc? You are working in an area of plus/minus
50 volts and the residual capacitor charges alone can easily cause damage.
I don't recall ever having a problem replacing dried caps around the UPC's which is a common issue. There are however small low value resistors supplying the chips that can easily open up & may be that is what you smelled?
Instead of wondering about what or how it may have happened, how about a voltage measurement around the IC's to see what you are looking at? |
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