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Old 09-14-2017, 07:01 AM   #61
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Join Date: Aug 2013
City & State: calicut
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Default Re: Pioneer VSX-520-K Protection problem

Originally Posted by rievax_60 View Post
The solder ball shorting Q437 would explain all of the damage you have found so far plus more possibly. Check all resistors in the area including R573.
I would not expect any damage to the output transistors or Q445.
Faults that cause amplifier outputs to go DC don't necessarily cause any extra damage.
Already i checked all the components the damages are found as below

2.Q443 Q444, Q417(blown)
3.R551 and R493(burn mark)
4.C531 (blown)

Rest of all components i ddint find any damages also i checked with multi meter

I will do test run evening then i let you know
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