Question about Yamaha DSPE390 Amplifier

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Power suply no osolation on power suply i change regulator and other capacitor

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Can you explain more of what is your concern? what help do you need.

Reden

Posted on Mar 19, 2008

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Osolation? What do you mean - isolation, or oscillation?

Posted on Sep 03, 2007

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Yeah that's right. Change/replace the power supply. Yet, you have to test the power supply's conditions if it still works alright. since you are suspecting both motherboard and HDD first. If yellow light comes and no action to the whole machine then that must be something in the motherboard. Before you finally follow your decision to change the power supply, check the motherboard. There are capacitors and examine if it didn't bloat. If it does, just take out the capacitors with exact microfarad and voltage specs or change the whole board. And granting though that the supply is bad, there must be some electric signals that have caused to the mother board which will eventually, at the end of the day, you encounter the same problem with it.

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hope this helps.
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Hi..there,
It's seems your backlight inverter is burnt out... need to be replaced with a new one or you can repaired yourself by testing all the capacitors to see which it has been burnt out or has a leaked. After that just replaced the bad caps... Good lucks, Have nice a day!

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at first chack at which time it shutting down. if it happen when u click on any drive or when u using cd/dvd drive then power supply cant regulate power. then chack switching transistor and filter section capacitor.
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Hi maxwell,

Firstly check for the surrounding components like th coupling resistors for a short. Change them, then look for leaky diodes (a diode shows low resistance when connected to a multimeter with correct polarity and MUST show infinite i.e. NO resistance at all when polarity of the meter testprods are reversed) As for the deformed capacitor change it with similar type, voltage and size.
VERY IMPORTANT: Make sure you put in the new one back in the same polarity (since it is an electrolytic type capacitor from what you mentioned in your querry) elase the new one will explode if the polarity is wrong.

Better still, if you are not good at soldering components that are so closely attached on the circuit board, just give it to an authorised service center in your area.

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