Question about Sony STR-GA7ES
Unplug it discharge output voltages with a 1k resistor then resolder the voltage driver ic's these ic's start with up, ie upc2558 , or stk350 etc. you will see the solder rings and cool solder joints around then. Use liquid flux and solder them back to the board. You might end up replacing them but youl never know until you try soldering them first. Larry's Electronics. email@example.com
Posted on Apr 24, 2010
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Posted on Jan 02, 2017
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Apr 18, 2015 | Sony Stereo Reciever Str-d1090
Sep 26, 2011 | Sony STR-DH810 Receiver
Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections as a root cause for intermittent shutdown.
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