Dell Latitude E5530 (LA-7902P REV:1) Does not display picture

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  • kamil1986
    New Member
    • Feb 2020
    • 2
    • Wielka Brytania
    #1

    Dell Latitude E5530 (LA-7902P REV:1) Does not display picture

    Hello everyone.

    Laptop Dell Latitude E5530
    Płyta: LA-7902P REV:1
    KBC: MEC5055-LZY
    Procesor: intel i3

    The laptop turns on but does not display the picture, after pressing the power button fan does not spin, the motherboard is stuck at 600mA current consumption the CPU and PCH chip gets warm. When I press again power button the fan start to spin but after a couple of seconds the motherboard turns off itself and current consumption drops to 12mA. The motherboard correctly displays fault codes because if I turn on the motherboard without RAM memory the LED faults code indicates the ram memory is missing. I replaced the CPU and RAM memory, no changes in the motherboard behavior. I reflashed BIOS and EC chips U53 and U52 (the U52 chip was damaged I had to replace it), reflash KBC chip, all without a positive result. The measurement I took from the motherboard is below. Please for advice on what to do next.

    PL100 -25MΩ motherboard turned on voltage 19.5V
    PL103 -35kΩ motherboard turned on voltage 5V
    PL101 -7KΩ motherboard turned on voltage 3,3V
    PL301 -360Ω motherboard turned on voltage 1,8V
    PL400 -100Ω motherboard turned on voltage 1,05
    PL500 -26Ω motherboard turned on voltage 1.07V
    PL200 -1KΩ motherboard turned on voltage 1,5V
    PL15 -24Ω motherboard turned on voltage 0,9V
    PL702 -7Ω motherboard turned on voltage 0,876V
    PL703 -7Ω motherboard turned on voltage 0,876V
    PL704 -4Ω motherboard turned on voltage 0V
    PL1300-330KΩ motherboard turned voltage on 19,5V
    PL1301 -7MΩ motherboard turned voltage on 0V
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