Hello everyone...i will start a series of posts with laptops that are my nightmares 
.
This time i have a laptop ASUS FX504GM after burned mosfets in the CPU power supply section.
Laptop motherboard model : DABKLIMBAB0 REV. B
CPU : i7-8750H
GPU : GTX 1060
Laptop history : Laptop has burned mosfets (including hole in the motherboard) near the CPU.
The burned mosfets were exactly : PQ94, PQ95, PQ96
After few hours of work ( restoring pads, connections, and removing shorts ) finally i have tested motherboard...and the laptop came back to life
...almost.
Laptop was turning on with and without battery, he was charging the battery and it was possible to enter to the BIOS, he was theoretically working fine but...
After testing further there was no possibility to startup windows from any hard drive ( fresh installation, and windows already installed on different drive ). It was stuck at black screen and nothing was loading
.
Here comes the best part: I was thinking that maybe there is something with the BIOS so i have reprogrammed the BIOS with the one from one of the posts in forum with the SVOD programmer externally and not by using in-curcuit adapter.
And the laptop has died , i mean : it is not powering on after i have soldered back the BIOS chip which was reprogrammed, and even the old backup of the BIOS makes no difference.
I have also soldered fresh new KBC IT8987E-BXA and also i have changed/ soldered the BIOS chip itself to the new one programmed with the backup BIOS file.
Laptop is still not turning on
Symptoms are as desribed below:
Laptop is not powering on ( it is acting like it was somewhere a short curcuit but i have not noticed that anywhere on the motherboard ), i hear a click of the power supply i guess on the montherboard which i guess is trying to startup but it is not starting. The fans are very slightly trying to move but they are not spinning ( there is just a very tiny move after i press the power button ) and on power supply i got for a very short time a jump into 0,4xxA or 0,5xxA current draw and it is dropping into almost 0
Almost because :
What is strange that after the battery is disconnected tha laptop takes from 0.003 to 0.008 that values are jumping (0.004A-0.007A...after few seconds 0.003A into 0.008A after few seconds 0.005A into 0.007A )
The laptop is charging the battery fine because i see that after power cable is connected the charging LED status indicates charging and on power supply i have a 1,760A current draw.
I have also noticed on thermal camera that after i press button i hear that click sound and the PCH and coil above him it is getting hot for a very short period like 0,5 second
Does it really mean what i suspect ? That in some miracolous way the PCH was damaged by the BIOS file from the forum ?
That laptop is a real nightmare
If someone have any idea or a tip i will be very grateful.
I am attaching a schematic and boardview in case someone will take a look...and the hole of the motherboard which was restored ( it was a nightmare restoring that pcb with layers, pads and connections )
MOD Edit: Link to Schematic & Boardview - https://www.badcaps.net/forum/showthread.php?t=92340
Reminder , rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483
.
.This time i have a laptop ASUS FX504GM after burned mosfets in the CPU power supply section.
Laptop motherboard model : DABKLIMBAB0 REV. B
CPU : i7-8750H
GPU : GTX 1060
Laptop history : Laptop has burned mosfets (including hole in the motherboard) near the CPU.
The burned mosfets were exactly : PQ94, PQ95, PQ96
After few hours of work ( restoring pads, connections, and removing shorts ) finally i have tested motherboard...and the laptop came back to life
...almost.Laptop was turning on with and without battery, he was charging the battery and it was possible to enter to the BIOS, he was theoretically working fine but...
After testing further there was no possibility to startup windows from any hard drive ( fresh installation, and windows already installed on different drive ). It was stuck at black screen and nothing was loading
.Here comes the best part: I was thinking that maybe there is something with the BIOS so i have reprogrammed the BIOS with the one from one of the posts in forum with the SVOD programmer externally and not by using in-curcuit adapter.
And the laptop has died
, i mean : it is not powering on after i have soldered back the BIOS chip which was reprogrammed, and even the old backup of the BIOS makes no difference.I have also soldered fresh new KBC IT8987E-BXA and also i have changed/ soldered the BIOS chip itself to the new one programmed with the backup BIOS file.
Laptop is still not turning on
Symptoms are as desribed below:
Laptop is not powering on ( it is acting like it was somewhere a short curcuit but i have not noticed that anywhere on the motherboard
), i hear a click of the power supply i guess on the montherboard which i guess is trying to startup but it is not starting. The fans are very slightly trying to move but they are not spinning ( there is just a very tiny move after i press the power button ) and on power supply i got for a very short time a jump into 0,4xxA or 0,5xxA current draw and it is dropping into almost 0Almost because :
What is strange that after the battery is disconnected tha laptop takes from 0.003 to 0.008 that values are jumping (0.004A-0.007A...after few seconds 0.003A into 0.008A after few seconds 0.005A into 0.007A )
The laptop is charging the battery fine because i see that after power cable is connected the charging LED status indicates charging and on power supply i have a 1,760A current draw.
I have also noticed on thermal camera that after i press button i hear that click sound and the PCH and coil above him it is getting hot for a very short period like 0,5 second
Does it really mean what i suspect ? That in some miracolous way the PCH was damaged by the BIOS file from the forum ?
That laptop is a real nightmare
If someone have any idea or a tip i will be very grateful.
I am attaching a schematic and boardview in case someone will take a look...and the hole of the motherboard which was restored
( it was a nightmare restoring that pcb with layers, pads and connections )MOD Edit: Link to Schematic & Boardview - https://www.badcaps.net/forum/showthread.php?t=92340
Reminder , rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483
.
Attached Files
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