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Logitech Z906 Burnt PSU: Seeking Schema for Resistor R26 & R95 on 94V E322995 Unit

@rti 15927 10
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 15997405
    @rti
    Level 21  
    Hello. The set included the power supply that is placed in the subwoofer. The case looks dull, because one of the resistors charred and desoldered from the temperature. I couldn't find a service manual for this crap anywhere on the net. Can any of my colleagues help? The power supply is marked 94V E322995. It would be nice if there was a service available :) The charred resistors are R26 and R95. Without a schematic, don't move, because these resistors probably did not burn themselves.
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  • #2 15998104
    humbel
    Level 27  
    Upload photos of the entire board and an approximate photo of the area around these resistors.
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  • #3 15998286
    @rti
    Level 21  
    Below are the photos you requested.
    Logitech Z906 Burnt PSU: Seeking Schema for Resistor R26 & R95 on 94V E322995 Unit Logitech Z906 Burnt PSU: Seeking Schema for Resistor R26 & R95 on 94V E322995 Unit Logitech Z906 Burnt PSU: Seeking Schema for Resistor R26 & R95 on 94V E322995 Unit
  • #5 15999104
    @rti
    Level 21  
    Well, if the resistors were somehow identified, now I have a problem with these transistors. The manufacturer used there MOSFET N-CH 900V 8A with the designation FQP9N90C. I haven't found anything like this anywhere. Can anyone help find a match? After the values, the only one that would fit (the voltage is 100V lower, however) is STP11NM80 and is available. Do you think it will fit? If not, please correct me. I only paid attention to the drain-source voltage and the drain current.
  • #6 16000456
    000andrzej
    Level 37  
    You can try. This 100V less should not affect operation. What only the internal resistance is different and I don't know where it sits.
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  • #7 16000580
    @rti
    Level 21  
    On the advice of the author of the topic about this set from the link above, I found FQP9N90C. It is the same transistor, but not insulated. I will use a thermal pad and it should be ok. I will let you know when the transistors arrive, how things are and whether the power supply has started or whether the IC in the generator is still sitting.
  • #8 16008465
    Lukson
    Level 32  
    Before you start soldering the keys, check the elements around the ISL6721AVZ and the system itself for short circuits.
  • #9 16009030
    @rti
    Level 21  
    Taking this opportunity, I will ask circuit diagrams for short circuits between which pins need to pay attention to this type of IC? I only checked the short circuit at the output of the system. The elements around it have been measured and there are no surprises.
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  • #11 16048059
    @rti
    Level 21  
    It is a pity that I have only read this post now because the speakers went to the customer after they were launched and I have nothing to compare the values of these resistors with. closing.
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Topic summary

The discussion revolves around a burnt power supply unit (PSU) in the Logitech Z906 subwoofer, specifically focusing on the charred resistors R26 and R95. The original poster seeks a schematic for the PSU marked 94V E322995, as they suspect the resistors did not fail independently. Users request photos of the board for better diagnosis and suggest checking for damage to surrounding components, including semiconductors. The poster identifies the MOSFETs used in the PSU as FQP9N90C and considers substituting them with STP11NM80, despite a lower voltage rating. Further inquiries about checking for short circuits around the ISL6721AVZ IC and the values of other components are made, indicating a thorough troubleshooting process. The poster expresses regret for not obtaining resistor values before the speakers were sent to a customer.
Summary generated by the language model.
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