Question about Dell HK395 Computer Speakers

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Main amplifier may be blown

Power supply is still good, transformer is putting out 15.5VAC. No output to speakers, suspect main board. Board shows no scorching of components, or venting of caps. Fuse good. May be IC related. may have been a victim of a UPS slowly discharging (linear voltage drain-off --110 to 0VAC) How do i get a new main board?

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Re: main amplifier may be blown

If your speakers have a warranty can you return that to the store with the receipt because the store will replace a new for defective product..or you can go to the web site of the brand of your speaker if you intent to buy the main board you can order trough the online shopping.

Posted on Dec 16, 2007

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How volt transformer for AOpen spekers?

If it is the transformer, it should be a DC output. Look where it connects, it will tell you what voltage you need. Use a volt meter to see if you are getting that from your "transformer". If so the amp in the speaker is probably blown, if not you need a new DC power supply with the correct voltage. If the replacement ma is higher that will not hurt, The information should also be on the "transformer".

May 31, 2016 | AOpen Computer Speakers

1 Answer

Subwoofer not working

The subwoofer is dependent on a sound amp powered by an external source whereby the speakers are powered by the line output from the sound source (like a computer speaker out jack). Powered Subwoofers controlled by a power amplifier require a power source such as an AC/DC source plugged into the house power. If the device is defective or a mismatch, the subwoofer will not function. Try a new power transformer and see if that fixes the problem. Other than that, if the power transformer is good, then the woofer could be defective.

Jan 13, 2014 | MA Audio MA5137 700 Watt 5.1 Home Theater...

1 Answer

My vizio e320vl turns on shows vizio screen and turns off. How can I reset it? I have tried unplugging and holding the power button down for thirty seconds no results

Set could be shutting down as no signal (usually 30 seconds or so) or it may have a power supply problem.

general info:

I see so many here with no sound/nopicture issues:


1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.

May 21, 2012 | Vizio E320vl 32-inch 720p Lcd Hdtv

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Think I fried the lcs 1030 main speaker board. The wrong power supply got connected and now the speaker doesn't work. Is there any way to troubleshoot and possibly fix

If you can get the speakers open, check for blown capacitors or puffy capacitors. If you see any they will need to be replaced with capacitors with the same UF rating and at least the same voltage and make sure you line up the striped line with the striped line of the motherboard. You'll need to be able to undsolder and solder the caps off and on.

If you see big black marks on the board then the board is basically usueless cause it would cost more to fix then the cost of the board itself. Also check for any blown fuses and if there is you would need to replace them with the same rating.

May 17, 2010 | Labtec LCS 1030 Computer Speakers

1 Answer

Loud humming sound. Blown power adapter transformer. Bought new adapter same humming

The power adapter that blew damaged the amplifier circuits inside the sub (or a damaged circuit caused the power adapter to blow)... in either case, if you have electronic skills and access to a oscilloscope, you can trace the signal on the circuit board. The suspect components to look for would be around the connectors for the power supply to the circuit board.

Apr 08, 2010 | Altec Lansing AVS 500 Computer Speakers

2 Answers

Bose Companion 5 110v/220v short circuit

The fact that everything but the power amp is still working, it could be only a fuse protecting the output that needs replacement although this fuse is probably circuit-wise after the main fuse you have already replaced and could be soldered on the board. Worst case, the output modules are blown and require replacement and depending on the power level it may be worth repairing instead of replacing.
Most modern electronic devices can be set or adapted to line voltages from 100-240 Volts and a good percentage of the devices, using the common switched mode power supply don't need any changes made by the user since they can be inherently 'auto-ranging.'

Apr 04, 2010 | Bose Companion 5 Multimedia Speaker System...

2 Answers

The mains transformer in my Logitech x540 has blown (oc on the primary). I've taken it out and its a simple single coil primary and secondary, but there are no markings on it to indicate the secondary...

You would need to rewind the coils.Do not try to do it by yourself if you have no idea what you are up-to...this time it was transformer next time it could it could be your circuit.Take it to a professional,the charges won't be much.
Good Luck.

Dec 27, 2009 | Logitech X-540 Multimedia Surround Sound...

1 Answer

Getting buzzing sound from speaker but can here sound from them.

You could have an earth loop which causes a hum/buzzing sound.
Is your computer and powered speakers plugged into different mains?
Connecting amplifiers and speakers to different power sockets will create earth loop problems
This can be fixed by using a single power board connected to a single mains power socket, then connecting all the computer components and powered speakers into this one power board.

Oct 31, 2009 | Harman Kardon Harmon Kardon SoundStick II...

2 Answers

Rippling vibration in sub woofer seems to be transformer related

The power supply outputs DC voltage so there is a 2200uF cap inside it.  If this goes bad you get a humming out (usually from the base speaker) even at minimum volume.  Inside the base there are 3 TDA2007a 6 + 6W stereo amplifier 9 pin inline ICs, one voltage regulator IC, 5 other ICs, 2 more tiny transistors, 1 2200 UF capacitor, plus a bunch of small caps. Usually one of the TDA2007a amp ICs has gone bad (in my case it was the one that drives the base so the popping sound was coming out the subwoofer).   The TDA2007a seems to be a faily common audio power amp IC.  The main problem with the Altec Lansing AVS500 is that there are no screws to be able to take apart the base so you have to brute force pry it apart and then the jacks and controls are also glued onto the front plastic face of the subwoofer so that must be carefully pryed apart also to get the small circuit board out to be able to work on it.  It's all too easy to break something if you're not carefull, but what the heck, if the speakers aren't workiing you don't have anything to lose and if you are proficient with a soldering iron and have or can get a TDA2007a audio power amp IC you might be able to repair it.   My own speaker problem was easy to determine as one of the TDA2007a was overheating super quickly after plugging in the power.   Good luck to anyone else attemping a repair.

Jun 24, 2009 | Altec Lansing AVS 500 Computer Speakers

1 Answer

Lots of problems please help!

  1. firstly you check the cable loose/break,
  2. check it by using multimeter
  3. dry soldering, loose contact
  4. resolder soldering points or reconnect cable
  5. your powersupply transformer coil may breaked now it become loose contact.
  6. you check the supply output voltage with and without load
  7. if low or no output voltage replace supply
  8. if you don't get the proper transformer rewind it
  9. also check power amplifier section short ckt

Jan 17, 2008 | Cyber Acoustics CA-3550 Computer Speakers

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