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Have a asw10-120 subwoffer. No sound and power

Have a asw10-120 subwoffer. No sound and power light is off when connected. 6800UF 50V capacitors and their resistors are ok. Any suggestions on a fix?

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SOURCE: Burns [blows out the 50v bridge rect] on power up.

I'd suspect the 6800uF caps, but I don't know for sure.

If it helps, here are the schematics for the upper and lower boards:

Upper board
Lower board

I wrote to KLH to ask for them, and explicitly asked for permission to post them here.


Posted on Jun 16, 2009

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1 Answer

Loud hum when powered on


its most likely bad capacitors inside the monitor. take it apart and look for 2 big black caps, there located right by the plug for the power supply on the PCB. they should say 25v 6800 uf.

if they are bulging out on the top and or have goo oozing out of them, there bad. these caps commonly go bad in these monitors because there rated WAY too low.

If you have to replace them, id go with some 50v 6800uf caps. they will be bigger and you'll have to solder leads and mount them elsewhere off the PCB, but you will NEVER have to change them again in your lifetime! (prevented no one else messes with it! )

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Open the monitor and find the power PCB. Look for blown capacitors. Replace all low voltage capacitors even if they look OK.
The power PCB is overloaded by shortage in these old capacitors.
If the monitor is not fixed now, replace two more capacitors - the big one, on 400V and a very small one on 50V in the high voltage circuit.

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Hi...
If you can solder and not electrocute yourself, there are some can shaped capacitors(condensers) in the power supply . They'll read something like 4700uF 50V
or 6800uf . Usually blue or black color. If theyre swollen or the plastic wrap around them is shrunk away, theyre bad

replace with same value but the voltage can be higher

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The zener diodes are 1N4774, I believe they are one watt. Try 3 watt metal oxide for the resistors. You might as well replace the 6800uF 63 volt main filter capacitors and the 220uF 50 volt capacitors while you're at it. Half the time the heat that cooked your other parts takes them out as well.

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1 Answer

Burns [blows out the 50v bridge rect] on power up. cant find the short??? all conds and resistors seem to check out OK ??? The four Z-diodes seem ok also ??? All transistors seem ok [no low ohms-only...


I'd suspect the 6800uF caps, but I don't know for sure.

If it helps, here are the schematics for the upper and lower boards:

Upper board
Lower board

I wrote to KLH to ask for them, and explicitly asked for permission to post them here.


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2 Answers

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Not sure i can help with the led problem but i just fixed a hissing problem with one of my BX5a monitors. It developed a hiss when on (both tweeter and bass) and a very loud thump when switched off. I found a slightly swollen power filter capacitor on the internal board. They are the two biggest black capacitors, labelled as 25v 6800uf. Only one of these was bulging. The tops of these should be totally flat. The indented X on top of the caps make any bulge easy to spot. Worth opening it up and having a quick look. I could only find 35v 6800uf caps at my local electronics store but they did the job ($3 each). I swapped both out and it's now working great. An easy DIY fix, just be sure to always have the power cord unplugged before you put your hands anywhere near the guts of the thing. Hope it helps.

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1 Answer

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Hi...
On some stereo gear the headphone jack interrupts the speaker connection when the headphones are in. you "might" have something broken in the headphone jack which is keeping the speakers from turning on.
Is there a MUTE switch on the unit?
Or an "External speaker off" thingy in the menu?

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I have a similar problem. I inspected the power board and found IC901 burned completely. I cannot find out the part number and have tried to get a reply from phillips but have not heard back from them. Anyone have a schematic or can give me the part # of IC901?

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1 Answer

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You can use a higher voltage capacitors without problems its the value of uf that should remain the same. But sometimes you can use a higher uf like a 330uf can be replaced with 470uf but never go lower than the original value on uf and voltage. But you can safely use 6800uf 25v or 35v.

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