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No sound from system

Re-solder contacts

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Wrong process, first find out why no sound, soldered contacts very seldom fail. See if you have an input signal. see if everything is wired correctly. Check fuses if any. Check power.

Posted on Dec 11, 2014

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My Panasonic surround sound system SC-PT480


Defect can be a switch (contacts / soldering or wrapps) ,or a fuse caused by a shorted rectifier bridge component or 1 diode in the bridge of 4 pcs , a shorted voltage regulator or shorted power mosnfet in the power supply. caused by a bad capacitor or soldering.
DVD Home Theater Sound System

Jul 16, 2016 | Panasonic Office Equipment & Supplies

1 Answer

Denon 500 SD - sound problems / crackling


Loose connection or cold solder and cleaning problem this is the main caused of no sound..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough. Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder". Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing.... Good luck: Regards, VOTIT

Jun 08, 2009 | Denon DHT500SD System

1 Answer

Sound just all of a sudden went out. What to


Your problem is a common symptom of loose connection or cold solder and cleaning problem this is the main caused of no sound or automatic shut off for how many seconds..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough. Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder". Again on the assumption of no defective parts, then seeking a more experienced buddy or bring it to authorized electronics service shop for the soldering might be to your advantage. This is of course in addition to avoid the possible electrical hazards when repairing.... Good luck: Regards, VOTIT

Jun 08, 2009 | Bose 3·2·1 II System

1 Answer

Sony compact AV SYSTEM DAV-S400


Hi Joey - I had exactly the same problem.

In my case, I followed the advice of others and took the thing apart. On the main amp board there is a large brown capacitor. Mine had come completely loose, so I soldered it back in place with a good amount of solder to make sure the contacts were ok. I also dabbed some solder on the headphone connectors on the same board (just follow the wire from the headphone socket to the board). Well, when I put it back together and tried it again everything worked perfectly, and it has so far remained free from the error. Hope that helps !

Nov 14, 2008 | Sony DAV-S400 System

1 Answer

Sound Problem


Loose connection or cold solder and cleaning problem this is the main caused of no sound..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 11, 2008 | Philips Audio Players & Recorders

1 Answer

I can get no sound from my hitachi AX-M80 CD system


Loose connection or cold solder and cleaning problem this is the main caused of no sound..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Regards,
VOTIT

DON'T FORGET TO RATE

Jul 29, 2008 | Audio Players & Recorders

1 Answer

I have a philips mini stereo system and it will just stop making a sound. the lcd panel still works but no sound comes out then it freezes and you have to wait about 30 seconds before it does anything


cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the philips receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Jul 14, 2008 | Audio Players & Recorders

1 Answer

Center speaker channel


This sounds like a bad connection inside the receiver. A 5 minute fix with a soldering iron and about 30 minutes to get to it.
If you can solder you should be able to fix this yourself.
Dan

May 23, 2008 | Yamaha Digital Sound Projector YSP-800S -...

1 Answer

Does not play when cold


sounds like a bad solder joint or 2 on one of the output ic'sas the car warms up it expands and makes contact when it is cold the joint is contracted and does not make a good contact point-redress the solder on the main circut board to fix this-if you can't do the soldering clenly you may e-mail me at merle840@aol.com

Jan 05, 2008 | Alpine CDA-9883 CD Player

2 Answers

Buzzind sound


There are two 470uF/25V capacitors on the power supply board in the sub-woofer that are the cause of buzzing, crackling and then eventually no sound. Go to Radio Shack and buy two Catalog #272-1030 470uF/35V capacitors and change them out. They are in the middle of the Power Supply PCB and are close to the long flat aluminum heatsink. As far as installation instructions go; you have to have some soldering experience, first. You will also need some type of de-soldering device, be it a solder ****** or solder wick to remove the caps. Make note of the polarity before removing. Then it is just a matter of popping the new ones in (they are slightly larger than the originals so they might not go all the way down flush with the PCB) and soldering them back in. Make sure you do not make any solder shorts or your system will be toast! Your unit will be as good as new and will probably last forever now.

Dec 24, 2007 | Philips HTS3450 System

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