Question about Creative Labs MegaWorks THX 250D Computer Speakers

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Cambridge megaworks 250D won't power up.

First, check the power supply and the fuse (the fuse is just below where the power comes in: remove the power cord, then gently lever out the fuse holder). Alas, for me both power and fuse are OK, but still no power. I will open up the back and look for loose wires next.

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Yes, Hi there, as junk996 say, check for the FUSE , and carefully see if burn, or something is bad waired, other than this, if you can RMS the unit is better, or with warranty.
If not, check with s tech guru , for open the panel and check cables, or broken wires. (board inside the sub)
good luck!
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Posted on Jun 29, 2009

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Posted on Jan 02, 2017

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1 Answer

Cambridge azur 540r receiver just stopped working. no power showing to on/off led.


Could have a problem in the power supply section. Check for open diodes and bad capacitors.

Sep 27, 2015 | Cambridge Audio Azur 540R Receiver

1 Answer

Megaworks 550d doesn't switch on


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.


3_12_2013_7_45_42_am.jpg5- replaced switcher TOP234Y and capacitors C102, C206, C205 and D10 as below photos.3_12_2013_8_08_28_am.jpg6 check all of related tracks in repairing area.3_12_2013_8_10_00_am.jpg


3_12_2013_8_48_15_am.gif7- 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.3_12_2013_9_02_39_am.jpg

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.



Nov 14, 2011 | Creative Labs MegaWorks THX 550 Computer...

1 Answer

My megaworks 5.1 550 gets no power... I dont know why. when i plug in power cable, there is no power...


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.


3_12_2013_7_45_42_am.jpg5- replaced switcher TOP234Y and capacitors C102, C206, C205 and D10 as below photos.3_12_2013_8_08_28_am.jpg6 check all of related tracks in repairing area.3_12_2013_8_10_00_am.jpg


3_12_2013_8_48_15_am.gif7- 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.3_12_2013_9_02_39_am.jpg

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.

Sep 15, 2011 | Creative Labs MegaWorks THX 550 Computer...

1 Answer

Power won't come on


No power signal lights appear?If no power lights try to check the fuse inside your TV.remove the back cover to see the fuse location.It is located besides the power supply.check it if busted,then replace the same value of fuse.Unplug first before removing the cover to avoid electric shock.thanks!!

Jul 07, 2011 | iLO LCT32HA36 Television

1 Answer

My Cambridge SoundWorks 88CD is not working...no display, no sound, the CD doesn't spin. Any hints? Thank you.


A couple of possibilities- If there is no fuse holder on the rear of the box, it may not be user-replaceable but soldered onto an internal board. If it has blown, either there has been a component failure in the power supply that caused the fuse to fail or the supply is not starting up as it should, a problem caused by cheap capacitors in certain areas of the supply. Unless you have at least a multimeter, this is not a good choice as a DIY repair.

Jun 17, 2011 | Cambridge Soundworks 88CD Clock Radio

1 Answer

Internal fuse on cambridge a1 mk3 has blown and when replaced,blew instantly??


When the fuse blows suspect an overload in either the power supply or Main Amp section.
Check for burnt/damage parts first!
Power Supply faults that will blow the fuse are: Transformer, Rectifier, Voltage Regulator, Large Electrolytic Capictors, Diodes & any other semiconductor connected with it.
Main Power Amp faults are: any semiconductor device on the heatsink.

Jan 04, 2010 | Audio Players & Recorders

1 Answer

Megaworks THX 550 does not power up


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...

2 Answers

My creative megaworks thx 550 does not power on anymore


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

Oct 28, 2008 | Creative Labs MegaWorks THX 550 Computer...

3 Answers

Creative cambridge sound work megaworks thx 5.1 550


i lost my Creative cambridge sound work megaworks thx 5.1 550 cable.can i use any other cable?

Jun 22, 2008 | Creative Labs MegaWorks THX 550 Computer...

1 Answer

Digital out peters with odd blipping noises then stops outputing.


Hello there
First things first:

* this is a creative labs speakers models sub problem**
if you have warranty I suggest you use, Creative is alert on this kind of pop up sounds and others, concerning the subwofers.
time to RMS, or fix on house or other person who can change some resistors on the SUB.
other than this, ...just change for CREATIVE 7800 speakers, are good, and they correct this issue on this ones, I got it and I have 3 years with them and no problems.
good luck

Feb 08, 2008 | Creative Labs MegaWorks THX 250D Computer...

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