I could use some help to troubleshoot an "almost dead" Dell Precision 3520 laptop (CDP80 LA-E152P board, Intel i7-7820hq cpu, Nvidia quadro m620 gpu) that started to die on me a few weeks ago.
Usually it will not POST, power button led stays on only for a few seconds with no other life signs. When the charger is connected it does the same, but the front battery indicator led slowly flashes white for ever (with or without any actual battery connected).
On very rare occasions it has POSTed, on one occasion i was even able to update the bios to the latest.
I took a bios flash dump and programmed some alternatives from around the net (for the specific board). Of course i have pulled the cmos battery during every flash, changed the cmos battery to a new one, tried a different main battery and memory, nothing new.
I can't find the exact schematic for my board, but found one for almost the same board (CDP81 LA-E153P), the only difference being it is missing the thunderbolt 3 circuitry that mine has (attached).
MOD EDIT: Schematic moved -> https://www.badcaps.net/forum/showthread.php?p=1252070
I am very experienced with electronics (not laptop motherboards unfortunately), so i thought i could use some pointers on what to check.
As a last resort i wouldn't mind even trying a cpu-gpu-chipset reflow if you think it could be the problem (cpu-gpu replacement is just uneconomical, i should as well change the whole board).
Thanks anyway...
Usually it will not POST, power button led stays on only for a few seconds with no other life signs. When the charger is connected it does the same, but the front battery indicator led slowly flashes white for ever (with or without any actual battery connected).
On very rare occasions it has POSTed, on one occasion i was even able to update the bios to the latest.
I took a bios flash dump and programmed some alternatives from around the net (for the specific board). Of course i have pulled the cmos battery during every flash, changed the cmos battery to a new one, tried a different main battery and memory, nothing new.
I can't find the exact schematic for my board, but found one for almost the same board (CDP81 LA-E153P), the only difference being it is missing the thunderbolt 3 circuitry that mine has (attached).
MOD EDIT: Schematic moved -> https://www.badcaps.net/forum/showthread.php?p=1252070
I am very experienced with electronics (not laptop motherboards unfortunately), so i thought i could use some pointers on what to check.
As a last resort i wouldn't mind even trying a cpu-gpu-chipset reflow if you think it could be the problem (cpu-gpu replacement is just uneconomical, i should as well change the whole board).
Thanks anyway...
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