So I managed to buy a broken SVS PC 4000 Amplifier for repair, This thing is packed with all kinds of stuff. Bluetooth, DSP, Phone App.
I managed to disassemble the plate amplifier its rather rugged/crowed with assembly plates to get to the main parts. I think I found the issues:
- Blown soft start stage.
- Blown Power Factor Correction stage.
I'm waiting on parts but the world is moving slow parts on back order, I wanted to share the parts, build quality of this amplifier is "reasonable quality".
#Configuration.
- PFC Stage.
- LLC Design. LLC
- Full Bridge amplifier (Vent Caps, IRS2092 driver)
- 2 Layer PCB.
#Parts used.
- UCC2863 PFC
- L6599AD (LLC) + LM358
- SF2008 Diode (PFC BOOST STAGE)
- HV MOSFETS P33N60E X 4 + X2 P33N60E Soft Start.
- STM32072 32-bit, m3 core.
- ADAU1718 (DSP, stereo audio codec)
- 100 V, 1200uf caps used. DC BUS. Vent
- 450V, 330uF. (High Voltage) Capxon.
# Parts to be replaced
- UCC2863 PFC
- L6599AD
- HV MOSFETS P33N60E X 4 + X2 P33N60E Soft Start.
I managed to disassemble the plate amplifier its rather rugged/crowed with assembly plates to get to the main parts. I think I found the issues:
- Blown soft start stage.
- Blown Power Factor Correction stage.
I'm waiting on parts but the world is moving slow parts on back order, I wanted to share the parts, build quality of this amplifier is "reasonable quality".
#Configuration.
- PFC Stage.
- LLC Design. LLC
- Full Bridge amplifier (Vent Caps, IRS2092 driver)
- 2 Layer PCB.
#Parts used.
- UCC2863 PFC
- L6599AD (LLC) + LM358
- SF2008 Diode (PFC BOOST STAGE)
- HV MOSFETS P33N60E X 4 + X2 P33N60E Soft Start.
- STM32072 32-bit, m3 core.
- ADAU1718 (DSP, stereo audio codec)
- 100 V, 1200uf caps used. DC BUS. Vent
- 450V, 330uF. (High Voltage) Capxon.
# Parts to be replaced
- UCC2863 PFC
- L6599AD
- HV MOSFETS P33N60E X 4 + X2 P33N60E Soft Start.
Attachments
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In my opinion, forget to repair the kit. As can be seen in the penultimate pic, the logic is damaged and those IC's usually are custom made, so difficult to obtain as spare parts or directly unavailable to servicemen. And in case you can magically found the part (s), who knows if the unviewable parts that seem to be OK, they are also damaged although not directly visible.
Nope. if you put effort in and trace the parts I listed you will find they rather common part numbers.
I had repaired thousand of industrial equipment with much larger voltages and currents. Usually frequency inverters for large and medium AC motors. My experience says that if the power stage is blown and no optocoupler between logic and power stages, it is usually unsuccessful any try to repair the device. Fortunately those kits are optocoupled or transformer coupled to logic. But in this case it seems to not be the case. Another question is about your ability to replace SMD devices. And the value of the blown resistors?
I have designed high density boards with 0603 parts, high density BGA 0.6mm DDR3, FPGA dont worry about my ability. The post was purely for SVS enthusiasm 😀
Today, this amplifier was fixed/saved from the landfill.
- PFC section was blown, x2 mosfets x1 controller. 😀
I think there is a factory fault on these amplifier, the PFC section is rated to for 800W applications, yet the amplifier is rated at 1200W, VBUS supply is rated +/- 70V.
- PFC section was blown, x2 mosfets x1 controller. 😀
I think there is a factory fault on these amplifier, the PFC section is rated to for 800W applications, yet the amplifier is rated at 1200W, VBUS supply is rated +/- 70V.
Reactance, thanks for the post. I have a pair of SVS SB-3000, good to know there is a possibility of repair if anything goes wrong in the future.
I hope you don't mind me posting this question here, my inbox is almost full.
So the optocoupler(s) are used to engage commands from the various sub-circuits all protection commands from the MCU. Not officially confirmed some are possibly
- overcurrent trip(s).
- dc-offset detect.
- temperature.
- power good signal.
- stand-by enabled / auto-on.
- The optocouplers question - they only act to galvanically isolate signals between the "low voltage DSP/MCU signals" and "HV high voltage mains power supply board", as they not shared.. there is a standby power supply that keeps the L6599AD controller chip powered via stand-by power circuit using a (TOP242-250)
I can hear a hiss coming from the woofer. no I don't but then again I have mine powering a JL AUDIO W6V3 set at 35Hz 24/db with a few PEQ eq's enabled. However I did hear a hiss from the PFC/LLC Stage very minor its only noticeable when exposed "open frame", whilst in a box, nothing its
dead silent.
On the repair, they don't use a traditional analog soft-start circuit + relay. but two large 10W wire-wound resistors to charge the banks, and when the capacitors are near full the psu is stabilized and a pair of P33N60E mosfets are signaled which carries the full 320Vdc load. (normally a relay is used here)
On PFC much can be said here but interestingly I found this now in the datasheet which I didn't notice. This
9.1 Application Information
This control IC is generally applicable to the control of AC-DC power supplies which require Active Power Factor
Correction off Universal AC line. Applications using this IC will generally meet the Class D equipment input
current harmonics standards per EN61000-3-2. This standard applies to equipment with rated Powers higher
than 75W. The IC brings two phase interleaved control capability to the Transition Mode Boost and hence will be
generally a very good choice for cost optimized applications in the 150W to 800W space, or to even lower
powers that wish to exploit the interleaving benefits of reduced filtering component size, lower profile solutions
and distributed thermal management.
The UCC28063EVM-723 300-W Interleaved PFC Pre-Regulator User's Guide (SLUU512) describes an EVM
design for a 300W Application.
This EVM has an associated Excel file to help automate calculations for its component choices available at
SLUC292.
IEC 61000-3-2 - Wikipedia
https://www.ti.com/lit/ds/symlink/u...https%3A%2F%2Fwww.ti.com%2Fproduct%2FUCC28063
So the optocoupler(s) are used to engage commands from the various sub-circuits all protection commands from the MCU. Not officially confirmed some are possibly
- overcurrent trip(s).
- dc-offset detect.
- temperature.
- power good signal.
- stand-by enabled / auto-on.
- The optocouplers question - they only act to galvanically isolate signals between the "low voltage DSP/MCU signals" and "HV high voltage mains power supply board", as they not shared.. there is a standby power supply that keeps the L6599AD controller chip powered via stand-by power circuit using a (TOP242-250)
I can hear a hiss coming from the woofer. no I don't but then again I have mine powering a JL AUDIO W6V3 set at 35Hz 24/db with a few PEQ eq's enabled. However I did hear a hiss from the PFC/LLC Stage very minor its only noticeable when exposed "open frame", whilst in a box, nothing its
dead silent.
On the repair, they don't use a traditional analog soft-start circuit + relay. but two large 10W wire-wound resistors to charge the banks, and when the capacitors are near full the psu is stabilized and a pair of P33N60E mosfets are signaled which carries the full 320Vdc load. (normally a relay is used here)
On PFC much can be said here but interestingly I found this now in the datasheet which I didn't notice. This
9.1 Application Information
This control IC is generally applicable to the control of AC-DC power supplies which require Active Power Factor
Correction off Universal AC line. Applications using this IC will generally meet the Class D equipment input
current harmonics standards per EN61000-3-2. This standard applies to equipment with rated Powers higher
than 75W. The IC brings two phase interleaved control capability to the Transition Mode Boost and hence will be
generally a very good choice for cost optimized applications in the 150W to 800W space, or to even lower
powers that wish to exploit the interleaving benefits of reduced filtering component size, lower profile solutions
and distributed thermal management.
The UCC28063EVM-723 300-W Interleaved PFC Pre-Regulator User's Guide (SLUU512) describes an EVM
design for a 300W Application.
This EVM has an associated Excel file to help automate calculations for its component choices available at
SLUC292.
IEC 61000-3-2 - Wikipedia
https://www.ti.com/lit/ds/symlink/u...https%3A%2F%2Fwww.ti.com%2Fproduct%2FUCC28063
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