Sceptre X425BV-FHD

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  • Garzlok
    New Member
    • Jul 2016
    • 6
    • USA
    #1

    Sceptre X425BV-FHD

    Issue:
    Red Standby Light is on. When I press the Power Button on the TV or the Remote, the Blue Light comes on, Backlights Come On, Sceptre Splash Screen Displays, Splash Screen goes away, Backlights stay on. Backlights turn off (Blue Light still On), backlights turn on, Sceptre Splash Screen reappears, Splash screen goes away, backlights stay on, backlights go off, and finally the status light goes from blue to red. (this all happens in 25-30 seconds)

    Oddly enough, every third push of the power button and the TV will come on and operate normally (if I don't turn the unit off)

    My electronics skill level is...well it isn't. Everything I've learned about TV's has been due to reading your forum posts and ShopJimmy videos.

    I did a check of the boards and I couldn't find any bulging or blown capacitors or anything that looked like a tell tale sign that something went amuck.

    On the Power Supply (MLT668TL-VM) I got the following voltages:
    Plugged In, Powered Off
    Everything read 0.0 Volts, except
    CON2, Pin 8, Yellow Wire, in the STB 5VSB 5V area: 5.0v

    Plugged In, Power On, Working normally
    CON4
    GND: 0v
    GND: 0v
    GND: 0v
    GND: 0v
    24V: 24v
    24V: 24v
    24V: 24v
    24V: 24V
    CON3
    GND: 0v
    GND: 0v
    24V: 24v
    24V: 24v
    CON2
    12V: 12.1v
    12V: 12.1v
    GND: 0v
    GND: 0v
    STB 5VSB 5V: 0v
    STB 5VSB 5V: 5v
    STB 5VSB 5V: 5v (this is the one that reads 5v when powered off)
    STB 5VSB 5V: 3.8v
    5V: 5v
    5V: 5v
    GND: 0v
    GND: 0V

    MAIN BOARD (B12083477 (T.RSC8.10B 12305))
    Plugged In, Power On, Working Normally
    Connector to PS, Left to Right
    5.1v
    3.9v
    0v
    0v
    5.1v
    5.1v
    5.1v
    5.2v
    0v
    12.1v

    Connector to TV Panel Controls, Top to Bottom
    0v
    0v
    3.3v
    3.3v
    3.3v
    3.3v
    3.3v
    3.3v
    3.3v
    0v
    4.9v
    2.9v
    0v
    5.1v

    Connector to speakers, left to right
    0v
    0v
    0v
    0v

    Connector to Sound, left to right
    0v
    0v
    24v
    24v

    Connector to Inverter
    12v: No Wire
    12v: No Wire
    BLO: 5v
    ADJ: 2v
    GND: No Wire
    GND: No Wire

    Backlight Inverter (AUO 19.42T14.001)
    EPMW: 2.1v
    IPWM: 5v (No Wire)
    BLON: 5v
    DET: 0.03v (No Wire)
    GND: No Wire
    GND: 0v
    GND: 0v
    GND: 0V
    GND: 0V
    VDD: No Wire
    VDD: 24v
    VDD: 24v
    VDD: 24v
    VDD: 24v

    T-CON Board (AUO 55.42T14.C09 (46T03-C0K, T460HW02))
    Didn't measure yet

    I was really hoping it was the Inverter. I disconnected the Inverter from the PS and the MB. The TV started to work and doing the flash light test, I could see an image. Cycled the power off and on a few times with good results. Then the issue reappeared and start to go through the original problem. I plugged the Inverter back into the PS but not the MB and much to my surprise, the TV turned on and worked properly but with a BLON of 3.3v at the Inverter. However, even with the Inverter disconnected to the MB, the original issue occurred again. (So I've found nothing out)

    All the voltages are steady and I don't see any fluctuations.

    When the TV decides to work, it looks great...well, as great as a Sceptre can.

    Any guidance would be greatly appreciated.
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