[vtech]

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?

[ivtec]

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.