I have been repairing Klipsch subwoofer amps for about 15 years as a hobby. I have decided to start blogging my repairs and eventually do videos of each one. This thread is intended to be a blog and a resource for information. I will try to answer repair questions as best I can. Comments and tips are also welcome, If you do not have the experience or the tools, PLEASE do not attempt any of these repairs. You will only end up damaging the board and it will end up costing more for a tech to repair the damage.If you do not have a high quality vacuum desoldering station (Hakko or Weller) and a current limited mains supply, you should not be working on these amps.These subwoofers do not have any user serviceable parts inside. If you open up the sub or attempt any repair you see in this thread, you are doing so at your own risk!!!
The PDC board 660038RA (main supply control) is almost always the main failure mode of these amps. The glue that was used becomes conductive and kills the board and the fets (planned obsolescence?). These boards are typically made in China and are super easy to damage. If you don't have a desoldering tool you MUST cut the board off and remove the legs from the thru holes one by one. Once the thru holes are damaged the repair becomes a difficult hack job unless you have a thru hole repair kit.
The other most frequent failures are the Bash control board and Q5. If Q5 is SOT-23, it needs to be replaced with a TO-92 2N4401. This mod was done on later revisions most likely due to warranty claims.
I have made a schematic of the PDC board and I also have made replacement boards (I do not sell or supply these boards). Sometimes they are so badly burnt, they have to just be replaced.
ALWAYS REMEMBER TO UNPLUG OR SWITCH OFF YOUR AMPS. CAPACITORS HAVE A LIFESPAN AND WHEN POWER IS APPLIED THE CLOCK IS TICKING. THE AUTO ON/OFF FUNCTION DOES NOT PREVENT THIS ON MOST MODELS!!!!!!!
Hi All I Have a Klipsch 12 Sub Synergy edition S/N : SUB12SV07490566. It Recently just stopped working no power getting through. The Red/Blue led is not illuminated showing power is on. It had a blow fuse which i replaced however still no power. I have removed the back plate to inspect PDC and cannot see any sign of burn out not smell no signs nothing. Board serial number is D107500208. Does anyone know where i can purchase a new PDC for this unit. Im in Perth Australia any help would be greatly appreciated.
Sub-10 / Sub-12 / RPW-10 Repair Blog
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Hi All I Have a Klipsch 12 Sub Synergy edition S/N : SUB12SV07490566. It Recently just stopped working no power getting through. The Red/Blue led is not illuminated showing power is on. It had a blow fuse which i replaced however still no power. I have removed the back plate to inspect PDC and cannot see any sign of burn out not smell no signs nothing. Board serial number is D107500208. Does anyone know where i can purchase a new PDC for this unit. Im in Perth Australia any help would be greatly appreciated.