MSI GL72 Board MS-16J91 - no 1_2VDIMM

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  • johnbeton
    Senior Member
    • Jun 2021
    • 95
    • Belgium
    #1

    MSI GL72 Board MS-16J91 - no 1_2VDIMM

    Hello,

    I'm looking for some assistance for a MS-16J91 board. When the adapter is plugged in, the powerled flashes slowly 3 times.
    19v main rail is always present, +3VALW and +5VALW are always present.
    +3v and +5v on the coils and +3.3v on bios chip are active untill the powerled goes off.
    Following the power sequence after +3 and +5 comes +1.2v for dimm on choke 9 I only have 0.1v.

    Drain of Q22 is 19v
    Source and gate are 0.1v

    I tested Q22 and Q25 on the board in diode mode, and they look ok.
    Maybe PU5 is the problem, but don't know how to diagnose this.
    I found boardview and schematic on this forum:
    https://www.badcaps.net/forum/troubl...ic-please-guys
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