si 3033c Same inputs different outs?

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  • FuzzyOwl
    Denon AVR-X3600H No sound even to pre outs in direct analog mode. Help please!
    by FuzzyOwl
    Hi, I have a Denon AVR-X3600H I'm trying to repair. I have no electronics repair experience but I have a multimeter, service manual and a will to fix it (https://device.report/m/d5de8c00e617...f63147aba9.pdf)

    Everything seems to work except for no sound even through the pre outs. However I will get sound using Zone 2 pre outs.

    Only digital symptom I can tell is it will soft lock when in the Speakers/Test Tone menu and be unable to adjust +/- db during the test tone.

    I've followed the trouble shooting guide, audio check...
    12-05-2024, 11:54 AM
  • DriversScrew
    Need help to identify SOT23-5 step-down converter to 3.3V marking E16q9
    by DriversScrew
    Hello everybody,
    I need to replace a shorted SOT23-5 step down converter in a consumer audio device marking E16q9. What I found out from the board layout and measurements:

    Vin: 5,0V
    Vout: 3,3V (connecting to all 3V3 inputs of a N32905U3DN)
    Pin1: ? (perhaps enable)
    Pin2: GND
    Pin3: Vout - connected to 3ยต3 coil
    Pin4: Vin
    Pin5: Feedback, voltage divider, two resistors connect Vout-Pin5-GND, 680k+133k

    I searched many datasheets, but no one seemed to match according the surrounding components.
    Best similar parts I found were...
    12-21-2023, 07:06 AM
  • madan1
    Mackie Th15 SMPS low Vout
    by madan1
    Hello,
    I'm troubleshooting a PA speaker Mackie Th15 (schematics attached).
    It is basically a smps with amp and some dsp.
    The issue is that on the secondary side I read +/- ~23V instead of the expected +/- 38V. Indeed all secondary side and feedback/aux rails are like 1/2-3/5 of the expected values.
    Q2, Q3, C35, C40, C33, C36, C41 and C42 were tested out of circuit with a component tester and read fine. Most of the other components on the primary were tested in circuit and seem to be fine. +HV to -HV on primary is ~330V.
    By the way, the ferrite core of L10 is broken,...
    02-16-2025, 04:15 PM
  • DAVEMAC02
    Inputs & Outputs to MJM2068MD-TE1
    by DAVEMAC02
    I'm trouble shooting a bad channel in a portable pa system. I suspect a dual OP amp is bad in one section. I want to signal trace the output of the B amp with an old Radio Shack audio signal tracer but don't know if this is feasible and won't cause damage. Thanks
    09-21-2024, 08:28 PM
  • mikay786
    Why are there two inputs mosfets?
    by mikay786
    Just trying to fix this old Alienware m14x laptop.

    found a shorted capacitor and a shorted mosfet on the input mosfet pair.

    im i newish to this and was wondering why you almost always have a pair of identical mosfets on in the input? They both do the same thing so what the point?

    also on a side note i am eager to test laptop since no short now, is there a way to bypass the 2nd mosfet for a temporary solution until replacement arrives?...
    03-18-2024, 06:51 PM
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