No Power to Sub

Oh dear you have inadvertently caused a great deal of internal damage to the sub by connecting the wrong power cable. Fuses blow when there is an overload. Often caused by a short circuited semi-conductor. In this case it could be anywhere in the power supply section of the sub.

Hi Tom,
If the tv does not turn on, it is a simple case of power supply (inside the tv) failure. Open the back cover if you can, check for blown fuse and replace it, if found blown. If the tv works, very good. If the fuse blows again, consult the repair man.
Good luck.

The power supply has gone bad. It should have a part number on it to find a replacement.

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

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.

This previous diagnostic, isn't good, if you test and no continuity between the positive and negative terminals generally means a blown sub.

You won't always get scratching or distortion from a blown sub. Sometimes the voice coil just overheats and burns out like a fuse. In this case there will be no sound at all from the sub, because no power can flow through the voice coil. A continuity test between the positive and negative terminals will show no connection.

Hope this helps.

You should open it up and look for a short. Usually, an exposed wire is touching metal. Wrap the wire with electrical tape and look for a ground wires that are loose. That will blow fuses too.

Upon opening the Bose Wave radio.. 4 screws only from the bottom. The fuse is located at the top side of the PCB. It is a small fuse. Kindly inform me if you need a picture. I am repairing one now

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Actually, there is a fuse. You need to take out all the screws and remove the two dials so you can take off the panel. Look to where the power cord connects to the board, and you will see the fuse. It is a 125V 4 amp fuse.