This has been bugging me for at least the last year or so, and someone posted on fixya.com that there were two caps that needed to be replaced, and it will work like a champ. So, being an electrical engineer that does this quite frequently (work on PCBs), I didn't hesitate to give it a try, because I had opened the damn thing up a few times before to try and figure it out. Anyways, it worked like a champ. Only took me about 20 minutes to get it apart, replace the caps, and button it back together again. Getting it back together wasn't too bad because all of the cables that I had to disconnect were all keyed, so no confusion getting all of the polarities correct...
Anyways, here's a pic of the offending board, and the fix that I made. Just wondering if there's any recourse w/ Philips. This is obviously a design issue, and being in the business, I'm curious if they just mis-specified the voltage on the capacitors (need +35V instead of +25V), or what.
Supplies:
- 2x 35V / 470uF radial-lead capacitors (part 272-1030 from Radio Shack)
- soldering iron
- solder wick (for removing the solder so that you can remove the parts)
- solder
- phillips screwdriver (cordless drill works best, since there are so many)
Also, note the polarity of the capacitors. I used the symbols on the silkscreen (backside of the PCB), and went from there.
10 comments:
Thanks for the great instructions. I just fixed my surround sound system yesterday following your directions.
Thanks a thousand times for your pictures.
Thanks. I bought this at a garage sale for $5. I fixed it for $2.50!
thanks a lot!
Your instructions were fantastic and the picture was perfect. It clarified the lingering doubt I had about the caps to be removed. Thanks!
Just did this and it works like a charm. Thank you for the pic which made things much easier!
Can I use 470 uf 50 v caps instead of the 35 v?
Thanks
Thanks for this great post--you just saved me $300 on a new home theater system. The pic really helped make it doable!
Here's a easy question for u.. I have a HTS 3450 philips surround sound system but i do not have the blueray player. Can i wire the vga cord to hook my smartphone into it? I was also told there is a low control voltage to turn the amplifier on in the sub woofer cabinet. Any help would be greatly appreciated!! Thanks..
For anyone else who still has one of these Philips surround sound systems, do you know what the actual output of the system is? While I might be able to fix mine by swapping out the capacitors, I would kinda like to replace it with something more conventional but I want something that is the same or hight power output. I realize it is labeled "1000W" but in comparing to other systems on the market, I am a little skeptical of that rating.
1000W is ridiculous. Try 230W into 6ohm (on the back of the unit). Probably 150W into 8ohm. 1000W may be the total output of 5 speakers, but the ohms of the speakers dictates the power output of the amp. Many times you see 1000W ( @ 2ohm) ratings on car audio amps which turns out to be more like 250 into standard 8ohm speaker.
You can always go higher volts/same value in capacitors, but some wont physically fit your footprint.
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