Having problems with your Creative Labs MegaWorks THX 550 Computer Speakers ?

Megaworks THX 550 does not power up

\015 I have had the Megaworks for many years and never had a problem. Suddenly ot does not power up any more. I checked every connection, cable and fuse and everything is OK. Took to a local shop to see if they were able to fix it but they could not find the schematics or circuit diagram over the web to help. Is there anywhere I can find the diagram? I am pretty sure it should be a diode or something like that in the power supply . I could not find an authorized repair service for it either since I am located in Brazil. Can anyone help?\015

Answers :

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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...
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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!
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The circuit diagram given on page 21 of the TOP234Y's data sheet was very useful, and helped me understand how the circuit functioned.
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I hope this is heplful for others who have this "no power" problem!

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