Leaky AC voltage in a sharp lcd TV

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  • 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...
    Today, 04:41 PM
  • Fernon@Repair
    Gigabyte Z490 Gaming X Motherboard No VCORE Voltage
    by Fernon@Repair
    i have Gigabyte Z490 Gaming X Motherboard .it has a power on no display fault .. no vcore voltage and debug led stuck CPU LED .

    VCCIO voltage ok
    VCCSA Voltage OK
    VCCPLL Voltage OK
    Ram Voltage ok
    RamVTT OK
    VPP 2.5 OK

    But No Core Voltage

    and i want to this vrm ic datasheet or pinout (ISL69269)
    anyone have this ic pinout voltages?...
    06-25-2025, 07:19 AM
  • sam_sam_sam
    Trip light 2400 watt line conditioner bought used issue with low voltage oscillation going on between relays
    by sam_sam_sam
    I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them

    The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly

    Now...
    06-09-2024, 10:57 AM
  • UNITRAX
    Tape recorder Sharp RT 1155 - DC voltage in the VU Meter circuit
    by UNITRAX
    I have a faulty right VU meter.
    At the poles, the DC voltage varies between 0.5 - 1.5 V
    The indicator does not respond to the ohmmeter at all.

    I checked
    transistors Q202, Q203
    capacitors
    C230, C231, C412
    D202 diode.
    Variable resistor VR 204
    T 201 coil

    Anyone have an idea how to get rid of the DC voltage?...
    05-13-2023, 04:28 AM
  • Document Archive
    ISL95831HRTZ ISL95831HRTZ-T ISL95831IRTZ ISL95831IRTZ-T Voltage Regulator Datasheet
    by Document Archive
    3+1 Voltage Regulator for IMVP-7/VR12 CPUs

    Compliant with IMVP-7/VR12, the ISL95831 provides a complete solution for microprocessor and graphic processor
    core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be
    configured as 3-, 2- or 1-phase VR while the second output is 1- phase VR, providing maximum flexibility. The two VRs share the
    serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two chip approach.
    Based on Intersil's Robust Ripple Regulator...
    11-05-2024, 03:24 PM
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