Leaky AC voltage in a sharp lcd TV

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  • 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
  • ruletero
    Acer a515-43 low battery charge voltage
    by ruletero
    Hi

    Acer A515-43
    LA-H801P

    Fail: Does not charge battery, has low voltaje on connector.

    Laptop didn't want to turn on, only charge led blinked.

    I found PQB5 (mosfet high battery charger) in short, voltaje in +12.6V_BATT was 19 v ...

    I changed it, changed PQB6 too and now battery charger voltage is 4.4V but battery is 3 cell, 11.25v, then is very low to charging.

    Laptop turns on without battery and works fine, but with battery turns on and turns off inmediately, I suspect battery bad but I don't know...
    10-24-2022, 02:31 PM
  • Document Archive
    LM358 LM358S-13 Datasheet
    by Document Archive
    The LM358 LM358S-13 consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.

    Application areas include transducer amplifiers, dc gain blocks and all the conventional op amp circuits which now can be more easily implemented in single power supply systems. For example, the LM358 series can be directly...
    10-07-2024, 04:12 AM
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