Insignia NS32L450A11

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  • pcardoso73
    iMac power supply short-circuit diode to ground
    by pcardoso73
    Hi,
    I have an iMac with the power supply reference: ADP-200DFB.

    This power supply is not working and when trying to debug the problem with a multimeter, I found what I thought to be a short circuited diode (the short-circuit is to ground).

    With the continuity test it beeps both ways, so doesn't block current flow at all then reverse biased. But after removing the diode the beep continues and the diode seems healthy. It seems to exist a real short-circuit.

    As I have another ADP-200DFB power supply (faulty one as well), I have checked the same...
    06-09-2020, 08:47 AM
  • Astonished
    Fixing the Charge Circuit of the Batteries of the DC Motor
    by Astonished
    Hi friends of electronics

    What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.

    The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.

    Please help me fix this circuit.

    (the datasheet of the IC: https://pdf.datasheet.live/28...
    01-28-2025, 06:24 AM
  • Askic
    Testing for short circuit in diode mode
    by Askic
    Hello electronics experts,

    On a few occasions I notice experienced technicians inspect for short circuit in diode mode on multimeter. This is OK and in some way equivalent to resistance mode, but more specifically I noticed that they put red probe on ground and black probe (connected to COM input on multimeter) is placed on the rail or pin.
    I wonder why is that. Why not place black probe of multimeter on the ground and red probe on the rail which is tested for short?

    Can you clarify this? When I test if something is short I use diode mode First and then double check...
    02-21-2021, 12:05 PM
  • asr
    Finding replacement diode iPad Pro 3rd gen A1701
    by asr
    Hello, I am looking for help to replace a damaged diode. The tristar was replaced and a diode was damaged in the process. I have a picture of the diode but dont have an exact donor. I mostly have macbooks for donors and only a few ipad and iphone boards. Diode part number: DSF01S30SCAP
    Im not sure where to find the ipad board number. Anybody have an idea where else this diode is used on other boards? Thanks....
    07-09-2024, 06:24 PM
  • rddube
    Lenovo L490 Ram voltage circuit malfunction
    by rddube
    Hello friends,

    Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.

    I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I...
    07-15-2025, 04:41 PM
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