Question about Creative Labs MegaWorks THX 550 Computer Speakers
All of a sudden the amp in the subwoofer cabinet does not power on. The Green Power LED does not light up.
Checked power cable and switch and seems ok.
Is there a fuse inside the cabinet that may have blown? If so, How do I get to to the fuse to change it? There are many screws on the back cover, which have to be removed to access the fuse?
Any help would be appreciated.
Step 1: i had same problem with my magaworks 5.1 thx550. i have tried to find solution in web but it was only one which voltage sense resistor 2Mohm track in PCboard was damaged. after check PCboard in my megaworks thx 550 i found that tracks are quite well and voltage sense resistor is well too. Step 2: REPAIRING PROCEDUREin below items there are repairing procedures that i did with my THX550.to access to BCboards it is required to remove electronic boards from woofer case. 1- remove cover of woofer.2- remove woofer speaker from case by cutting and marking connected wires. 3- remove all Philips screws around cover and remove electronic parts smoothly, care about glues around power cord.4- remove and disconnect power supply board from other parts. 5- replaced switcher TOP234Y and capacitors C102, C206, C205 and D10 as below photos.6 check all of related tracks in repairing area. 7- now it is time to re assemble electronic parts very carefully and prepare for test. it is better to use isolated transformer and put a lamp in serial to protect PCboard against short circuit. if green LED (POWER LED) is on it means that every thing is O.K. 8- in this step all of electronic parts should return back to case and reconnect sub woofer connections. Step 3: after replacing damaged parts my THX 550 is working well maybe for next 10 years. i hope above mentioned instruction can be useful and helpful.
Posted on Mar 15, 2013
Ok, so far, you said you checked the power cables and switch and they seem ok. But i have run into a simliar problems with some equipment i use. Sometimes a plug may go out of a strip, but not take out the entire strip( have that problem with a power strip right now actually, in the process of fixing that)
Also, im not sure what kind of Cabinet you have, so i dont know what to really suggest other than to find either the model of your cabinet and pull up the building spec's on it, if it comes with its own cabinet or contact the manufacturer.
Without having either a picture or name and product number. I dont feel i can really help otherwise with the problem.
Please be more detailed. I would be glad to help all i can, but more details will be required
Posted on Oct 28, 2008
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Posted on Jan 02, 2017
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I was able to repair my sytem using the guidelines from pouakai at (http://forums.creative.com/t5/Speaker-Systems/Successful-repair-of-MegaWorks-THX550-power-supply/m-p...
My system also would not turn on. The problem was on the power PCB - the one with the two large heat sinks attached. I found that the piece of PCB track joining the 2M ohm resistor (connected to the LINE-SENSE pin of the TOP243Y switcher) to the positive output of the full-wave bridge rectifier, was broken. This could have been caused by corrosion from the glue (which covered that section of track). I also replaced the 2M (0,5W) ohm resistor, just incase it was also to blame. The 2M ohm resistor is located under one of the two black heatsinks. I used a short piece of wire to replace the PCB track (from the large filter capacitor next to the resistor) to the 2M ohm resistor. Plugged everything back in, and it worked!
The circuit diagram given on page 21 of the TOP234Y's data sheet was very useful, and helped me understand how the circuit functioned.
I hope this is heplful for others who have this "no power" problem!
Aug 22, 2009 | Creative Labs MegaWorks THX 550 Computer...
Jun 22, 2008 | Creative Labs MegaWorks THX 550 Computer...
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