Replace Q7330/35 and D7301 from donor board.
Better to replace the caps too.
Better to replace the caps too.
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A1311 late 2009 820-2494A only 1 led non starting
- Thread starter ex250
- Start date
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.
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.
Check voltage on other big coils.
Check U7401 voltage; pins 14, 16, 22, 29.
Seems to have similar problem.
Check resistance to ground at L7460 (ohm scale).
Check resistance to ground at L7460 (ohm scale).
Value looks good.
Check U7401 surrounding components.
If all good, change the chip.
BTW, any reason to quote an entire post, visible few centimeters above?
Write directly into reply box, instead of clicking Reply button...
Check U7401 surrounding components.
If all good, change the chip.
BTW, any reason to quote an entire post, visible few centimeters above?
Write directly into reply box, instead of clicking Reply button...
L7201/21/41 voltage appears?
Check ALL_SYS_PWRGD and PCIE_RESET_L, when fans spin.
You may need to test with other MXM graphics card.
Check ALL_SYS_PWRGD and PCIE_RESET_L, when fans spin.
You may need to test with other MXM graphics card.
Check voltage at pins 19 & 32 of U7100.
Check pin 33 too...
Try changing U7100.
Did you test with known good CPU?
Did you test with known good CPU?
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?
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?
Did you try known good DDR module, each slot at time?
Just in case, try known good BIOS.
Just in case, try known good BIOS.