Question about Sony STR-DE898 Receiver

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No power to unit - Sony STR-DE898 Receiver

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  • wdunbar Jan 15, 2009

    we tried that,we checked fuses in unit.

    it don't have power going to the transformer

    but has power going to the power board

  • wdunbar Jan 15, 2009

    model #str-de898

  • wdunbar Jan 15, 2009

    no +7 volts

  • wdunbar Jan 23, 2009

    well we replace the transformer

    still no power

    we have 9+ volts at pin 6

    any other leads

  • wdunbar Jan 23, 2009

    we changed the transformer and still doesn't work

    we are getting 9+ volts at pin 6

    any other leads

  • Shahid Electronics
    Shahid Electronics May 11, 2010

    OK, receiver has one standby power supply, please check standby +7volts are available at CNP810 pin-6

  • Shahid Electronics
    Shahid Electronics May 11, 2010

    right now I'm getting service manual and mean while let me know do you have electronics repair experience and have necessary tools to carry out receiver repair?



  • Shahid Electronics
    Shahid Electronics May 11, 2010

    what is the exact model of Sony receiver? so I will look into schematics.

  • Shahid Electronics
    Shahid Electronics May 11, 2010

    check ac outlet has power by plugging another thing and check receiver in different ac outlet in house.



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  • Master
  • 10,594 Answers

OK, No +7 Volt.
It means Stand-by Transformer (T902) is bad / open and you need to replace it.
Its part number is as follows...

1-437-312-11 TRANSFORMER, POWER

Available in Part Store.

Below is an image of 'Standby Power PCB' and T902 is marked with red.

no power - 91be3e4.jpg

Good Luck.

Posted on Jan 15, 2009

  • Shahid Electronics
    Shahid Electronics Jan 23, 2009

    OK, so standby supply is OK now.
    This 6 volt goes to IC1011 on digital board, then IC1021 to become regulated 3.3 volt supplied to System Control IC1101
    I would recommend to have service manual for this unit to rectify problem area.


  • Shahid Electronics
    Shahid Electronics Jan 23, 2009

    below is an image of first page of service manual and you can buy it online manual website for small fee.




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1 Answer

The receiver after turning off will turn it self back on, repeatedly.


The unit is drawing too much power and is being protected by a current/temp sensitive device that shuts down to protect unit. When it cools, the power is restored until it heats up again, and the cycle continues.

Sounds like something in the power supply area is the cause of the anomaly.

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Onkyo tx-ds656 stand by power light comes on volume control knob rotates to max but display or unit wont start


Try factory reset: while holding the(CD) button on front panel,press (POWER) button.
After "Clear" is displayed the unit should be back to its factory default. :) If this dont work for you take the unit to be checked by service . :)

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My philips HTS 3555 stopped working. The standby light comes on sometimes but when I push the button, It turns green, the fan turns on for a second, then off, then on for a second, then off again. It then...


Hello,

Your unit being stuck in standby mode is an indication that its having a power problem. Remove it's plug from the wall, wait for about 30mis, fix it back into the wall, then turn it on again. If its still stuck in standby mode, then the power supply board in the unit is the cause of the problem.

The power supply board might be defective and maybe that's why the unit won't power up. Its receiving power but it cannot transfer the current to the necessary part of the unit because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the unit might not come on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

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1 Answer

No power on ac


Hi,

if it does not power up, then it means its having a power problem. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Regards.

Apr 19, 2011 | Audio & Video Receivers

1 Answer

Unit will not turn on


Hello,

if it does not power up, then it means its having a power problem. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Take care.....

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1 Answer

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This is a logic problem with the internal microprocessor. A quick experiment: Turn the unit on for about 2 minutes and shut it down. Doe sit power uip in this case? If so, I'd suspect that the heat generated during normal operation is creating an internal problem thaty is preventing the micro from recognizing the "off" condition. The power data line is hung and is not being recognizwed by the micro so any attempt to turn the unit on will fail. The unplug/re-plug essentially clears or resets the unit.

If the unit is new, return it for warranty repair. It will be important to describe when the unit fails however. Try to see how long it must remain on for the problem to occur.

Update this with your results if the unit is not under warranty and we'll try to narrow it down.

Thanks,
Dan

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1 Answer

After powering up the display reads, "No Disc" and unit powers itself off after about 10 seconds.


Please update this with the make and model. With that info, I should be able to figure out what is happening. In generic terms, the unit performs some system checks when powered up. It seems that a problem is found that is causing the system to shut itself down. Any details about the unit and what you hear or see in addition to what you have already posted would be helpful as well.

Hope to hear from you soon.

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2 Answers

Keeping it on


The User Manual says this is a result of the power being removed while the unit is still on. In order to reset this you need to:
1. Unplug the unit
2. Press and hold the the power key
3 While holding the power key, plug the unit back in.

This clears the units memory so you loose and settings you have set but the unit works again.

Hope this helps.

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TEAC MC-DX32i suddenly the Subwoofer power light (usually blue) is amber -- and no power to the main unit....second unit this has happened to.....


I have several of these units due to being a liquidation seller, and the MOST common problem is the subs not getting any power. Next is CD Player Dying, and 3rd, unit powering, but not sending info BACK to the sub.

In any case the issue with the subwoofer is rarely the fuses. It's further up the line. So far every unit we have checked the transformer was the culprit. If you are handy, by all means replace the transformer and you're better to go.

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2 Answers

My unit has power, but it won't turn on at all.


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