Question about Onkyo 630-Watt 7.1 Channel Home Theater Speaker

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Onkyos are notorious for running a bit warm - though if yours is excessively warm, double-check the impedance of, and wiring -to- your drivers.

Posted on Dec 02, 2008

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My subwoofer started making a loud sound like feedback and heated up so trying to troubleshoot this?

Subwoofers are just amps. The main cause of this will either be the main device on the board - perhaps attached to a heat sink, or perhaps a large electrolytic capacitor. But if there is something getting hot, then find that part and replace it. I suspect it will be the main device though!

Dec 26, 2015 | Speakers & Subwoofers


KEF PSW 2500 Relay buzzing and audio output buzz

Have just repaired a similar problem with a KEF 2500 - relay was chattering at 50 Hz rate, buzz in speaker output.

Problem was caused by overheated / dried out Electrolytic filter cap (C52 - 47uF 63V) on the relay coil supply feed.
The overheating is caused by adjacent power supply dropping resistors which run very hot due poor design of power supply.

A service manual for a similar model is available at following link, refer to power supply section:-

To replace,
1) remove chassis from speaker cabinet (8 screws), disconnect red/black speaker wires from main PCB spade connectors.
2) Remove 4 screws attaching main pcb heatsink assembly from face panel - lift assembly from faceplate (a bit messy , much heartsink compound between mounting faces)
3) unplug the AC 3 pin connections adjacent to the large capacitors and the 3pin connector on end of pcb (near C52), then roll assembly over the top of the audio sub-board to access underside of pcb.
4) solder connections to C52 is accessible at edge of board without further dis-assembly.
Take extreme care replacing C52, as the circuit board is of poor quality, (usual domestic electronics quality) being single sided copper without plated through holes.
The board is already heat damaged by heat buildup from power supply resistors, so the track will most likely lift and crack when disturbed- to counter this problem link the +ve capacitor pigtail to an adjacent solder pad on the same track.
Assembly is reverse of above, take care to preserve/ensure minimum disturbance of heatsink compound.

A user tip- don't leave unit switched on when not in use- heat buildup will eventualy cause it to fail due dried out electrolytic capacitors.
Poor power supply design is the main source of the standing heat buildup.

on Apr 28, 2010 | KEF Audio PSW 2500 Subwoofer

1 Answer

Has anyone tried drilling the holes in the AMP Housing in their Infinity PS-12 to correct the Overheating/In&Out of standby mode?

I will suggest you dont drill the box. Insteady, you should open the box, and find heat sink matarials that you can attach to the power semiconductors to improve the heat draw from the factory heat sink.
see the link below for some heat sink on ebay

Nov 14, 2011 | Infinity PS-12 Subwoofer

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I need a fuses for my durabrand home theater system and model is ht-3916. i went to radio shack and purchase a fuse 1.6 amp volt fuses and it still don't work can you please help me thank you

Do you mean it blew them again or that it didn't work and the fuse is still intact?
If it blew it again the problem is not the fuses. Instead what you have is a semi-conductor device that has developed a short and that is blowing the fuse. Check any devices in the power supply section, look for signs of damage or heat and also any devices on the heat-sink.

If the fuse did not go and it still doesn't work check the power supply only or the on-off switch.

May 24, 2011 | Durabrand HT-3915 System

1 Answer

Mordaunt Short MS409W cuts out. I think due to oversensitive overtemperature sensor on the heat sink. Some of the components (two electrolitic caps and a choke) close by look to have become very hot. With...

I read about lots of similar 'cutting out' problems on other bulletin boards, revealing that this is a common problem with this particular model. Many people had the faulty speaker replaced or repaired, then had a similar problem with the new one. As the manufacturer doesn't seem to have taken any responsibility for it and as I am an Electroinic Repair Engineer, I decided that I needed to find a creative solution.

I read lots of reports about fuses blowing as the wrong rating had been fitted by the manufacturer and reports of people fitting uprated fuses (very dangerous) after the higher rated fuses had blown. People often still had the same cutting out problems after doing this. I then found a 'fix' carried out by someone who clearly had a very rudimentry grasp of electronics but nevertheless claimed to have found a cure for this problem. I decided to check out this 'fix' which consisted of adding a link between two points on the power supply circuit board. This is the circuit board covered in black heat shrink sleeve.

I examined it and found that it contained a relay that transfers the secondary voltage from the turoidal transformer to the larger, circuit board. The relay appears to be responsible for switching through the primary positive power supply voltage for everything. So, by shorting out the input to the output, the electronics is no longer dependant on the relay operating to keep the supply going to the main circuit board. I figured that it could be the relay causing the 'cutting out' problems which is why the writers 'fix' worked.

I carried out this modification to the speaker I was repairing and as far as I can see it now works perfectly. The 'fix' does of course mean that the power is never removed from the main circuit board even if it is supposed to be, say for a 'soft start' or similar. Of course, since the speaker was basically scrap as it would have been to expensive to obtain and replace the faulty parts, this repair means that my customer now has his speaker back for very little cost.

If you at FixYa would like the full details for this repair, I will only charge you a one off fee of £80 for the several hours I have spent working on this solution. Of course I am perfectly happy to make the information available free to any member of the public or non-profit organisation that would like it. After all I only really checked out the repair that someone else had posted to make sure that it was reasonably safe and that it worked. No guarantees.


Jan 29, 2010 | Speakers & Subwoofers

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Blown fuse on mine. replaced it and it blew again instantly upon power up. meter shows 7 amps flowing through fuse holder and this is only a 2 amp fuse. What else in the circuit would be causing it to draw...

We are talking about a subwoofer? Two causes. The Power supply and the Amp section. First power -transformer, rectifier, voltage regulator, big capacitors. Amp section whatever does all the work, often on a heat sink, most likely cause too!

Dec 12, 2009 | Speakers & Subwoofers

1 Answer

My SW 22HT Kenwood subwoofer stopped working.The fuse was bad it was replaced and the new fuse blew again

The reason the fuse blew again is that an overload has occured. It could be a faulty part in either the power supply section, or the amp section. Follow the curcuit from the fuse, be on the look out for damaged, burnt parts, suspect anything on a heat sink.

Nov 30, 2009 | Speakers & Subwoofers

1 Answer

TX-SR603X Left channel Front & Surround not working in all modes. Issue follows the receiver when switching speakers. Mono only produces sound from the right side.

Sounds like the left channel front etc, transistors or whatever powers it have failed. They will be on a heat sink, you just need to identify them and replace them.

Nov 28, 2009 | Speakers & Subwoofers

3 Answers

Altec Lansing ADA995 does not work

This is my Dell Altec Lansing 5.1 (ADA995) surround sound amplifier for my computer. There is a design flaw where the board gets corroded due to the fact they caulked or glued it togther and left some of the circuit board hanging out. Just thought I would point out my findings in case some of you had the same system. It's a relatively easy fix. I got all the parts from Newark for about $30.00, and it took roughly 2 hours. Original Amplifier Chips below:

Positive Voltage Regulator is blown out:

Notice the traces where corrosion caused a short:

Another view of the burnt traces:


The glue or caulk ran straight across here:

This resistor was blown out.
I pulled it out before I took the picture I went ahead and replaced all of the 4.7 ohm 1/4 watt resistors:8_18_2012_3_31_59_am.jpg

Blown out 4.7ohm 1/4 watt resistor:8_18_2012_3_32_37_am.jpg

New goods!8_18_2012_3_33_48_am.jpg

Just before surgery on the amp chips:

Re-jumpered the traces:8_18_2012_3_35_55_am.jpg

Re-jumpered the traces:8_18_2012_3_36_44_am.jpg

New amp chips are in! Boy that "Heat Sink Transfer Paste" is really messy!!!:8_18_2012_3_37_26_am.jpg

A peek at the underside:8_18_2012_3_38_11_am.jpg


New L7815CV Positive Voltage Regulator (Shown here):
New L7915CV Negative Voltage Regulator is on the back side:8_18_2012_3_39_35_am.jpg

New amp chips are all nestled down in their new home!:

Boy that's a big heat-sink:

Time to try it out. And it works. Boy, going a week with out 5.1 audio on your computer is terrible! Nobody should have to live that way or be subjected to that kind of torture. I guess this would be considered a "first world problem"!


Aug 20, 2008 | Altec Lansing ADA995 Speaker

2 Answers

Celestion S8

Most likely there are electrolytic capacitors in the power supply and also possibly in the amp sections that are going high in ESR.

It would be best to test all the caps with an ESR meter and then replace the ones that are out of spec. You have an excellent chance that this will fix the unit.

If you are not experienced at doing electronics servicing, you can give the unit out to a service center to have it fixed.

Jerry G.

Apr 06, 2008 | JBL PB12 Subwoofer

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