Question about Sony LBT-W900AV Shelf System
Hi, My child had put something into the system so I undid the casing and got it out, now when running - Push power protect comes up. can u help me???
Did you put it back the way it should be? if yes, then that problem is not that big deal but if you insists on removing that, try bringing that to a technician.
Posted on Jun 26, 2009
Push power protect traced cause to Amplify DC protection circuit on the amplifier board. Actual fault was a short circuit of the Amp. IC left channel outputs (Part STK412-030 Pins 10 & 11).
Excessive solder applied during manufacturer had probably been heated up enough during usage to bridge the pins. Bypass DC protection for left channel by isolating input to DC detect transistor.
Posted on Jun 26, 2009
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Posted on Jan 02, 2017
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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.
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