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Recent content by ex250

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    A1311 late 2009 820-2494A only 1 led non starting

    DDR slots tested with the same result. Did several tries, and sometimes L7201/21/41 get 1.08v (that should be ok), restarts if self and get 1.28, then powers off. Next manual switch on, starts at 1.28, restarts in 2 seconds and gets 1,53v, then powers off, switch on manually and reads 0.8v...
  2. E

    A1311 late 2009 820-2494A only 1 led non starting

    Tested with a functional CPU, still same. I started the board without CPU and there is 1.28v at the L7201/21/41 Seems that something shorts them with the CPU inside... Could inject that voltage to find any heating element, if there is any other, apart the cpu. What do you think?
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    A1311 late 2009 820-2494A only 1 led non starting

    P33-> 3,37v P36->0,05v
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    A1311 late 2009 820-2494A only 1 led non starting

    P19-> 5,056v P32-> 1,085v
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    A1311 late 2009 820-2494A only 1 led non starting

    L7201/21/41 0,01v ALL_SYS_PWRGD 3.38v PCIE_RESET_L 0v The MXM card is a working one.
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    A1311 late 2009 820-2494A only 1 led non starting

    Just replaced the U7401, now the second light powers up, mounted the system, but powers, fan speeds up and power down again. No post error sounds, no "dong" sound and no screen powering up.
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    A1311 late 2009 820-2494A only 1 led non starting

    Just only find a too high diode value at pin 13 of the U7401, 2,056
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    A1311 late 2009 820-2494A only 1 led non starting

    L7460 to ground-> 5,5 Ohms
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    A1311 late 2009 820-2494A only 1 led non starting

    U7401 14 -> 12,08 16 -> 5,09 22 -> 5,07 29 -> 3,33
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    A1311 late 2009 820-2494A only 1 led non starting

    L7320->5,08 L7460->0,01* L7610->1,21 L7660->3,37 L7920->1,11 Seems that there is a problem at the L7460, likely u7401 related? what to check there? Many thanks for all your help and guidance
  11. E

    A1311 late 2009 820-2494A only 1 led non starting

    Hello, unsolded from a donor a D7301, values where different on diode, so changed it first Results: P1->3,36 P2->4,55 P3->1,078 P4->0,801 P5->5,09 P6->5,09 P7->5,09 P8->GND P9->2,89 P10->5,09 P11->12,08 P12->9,98 P13->7,09 P14->5,09 P15->5,09 P16->1,25 But still not working led 2 of the board.
  12. E

    A1311 late 2009 820-2494A only 1 led non starting

    Yes, I have the 5VREG_EN at 3.36v L7320 -> 0.108 U7300 v diode P1 -> 3,36---- 0,568 P2 -> 4,55---- 0,728 P3 -> 2,66---- 0,726 P4 -> 0 ------ 0,721 P5 -> 0 ------ 0,112 P6 -> 0 ------ 0,827 P7 -> 5,089-- 0,582 P8 -> gnd ---...
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    A1311 late 2009 820-2494A only 1 led non starting

    Do you know a easy way to check for a problem there?
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    A1311 late 2009 820-2494A only 1 led non starting

    The U7300 gets some hot when powered, around 38C quickly, and also the U1400, if the 7300 was bad, should not heat up? not?
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    A1311 late 2009 820-2494A only 1 led non starting

    Two lots of 2 units from different sellers, latest ones came in bga sealed packets, tested all four with same results, just because of this I said this make me crazy. Any other thing to check?
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