CX62 (MS-16J71) No turn on after water damage

R EZ A

hello my friends
this laptop came with water damage problem and short circiut
it was Q22 and after replacing mosfet and it keeps burning
i remove PU5 Q22 and Q24(Ram supply)
now when i apply power and push power button i hear tiny click sound from cpu area and psu shows 0.1A and C.C light for just a little moment
i want to find does it means dead cpu?

Serguz05

where are the measurements? resistance / voltage. or is it necessary to guess.

R EZ A писал(а):

it was Q22 and after replacing mosfet and it keeps burning

and RAM is whole? worker ? if the RAM is burned out, then the processor is probably too. After all, the processor communicates directly with RAM.

R EZ A

Serguz05 писал(а):

and RAM is whole? worker? if the RAM is burned out, then the processor is probably too. After all, the processor communicates directly with RAM.

i mean mosfet keeps burning after replacment

i tried replacing TPS51216(pu5)
without mosfets it turns on to 0.2A and 3.3v ,5v and +1V_SUS is on
after adding mosfets it goes to short circuit and even without mosfets use 1.2A when turned on so pu5 died again
i have no more TPS51216 and replaced by G5316RZ1D
now it turnes on and use 0.2A again
how can i find does pwm work correctly and dont kill mosfets again

Serguz05

R EZ A писал(а):

i mean mosfet keeps burning after replacment

is RAM installed? if the RAM is defective, then PU5 may burn out.
you also need to check the PU5 harness. what on VBST 15pin, pr72, pc39, pr86,
what is the resistance on Choke6 with ram and without ram.

R EZ A

Serguz05 писал(а):

is RAM installed? if the RAM is defective, then PU5 may burn out.
you also need to check the PU5 harness. what on VBST 15pin, pr72, pc39, pr86,
what is the resistance on Choke6 with ram and without ram.

its all without ram
+1_2VDIMM looks short to ground: 1 Ohm
i remove pu5 ,q22,q244 and still 1 ohm

is it harmful to apply 1V to output?

Serguz05

R EZ A писал(а):

1 Ohm

Well, here's the problem.
you can apply 1v and see what is heated.

R EZ A

Serguz05 писал(а):

Well, here's the problem.
you can apply 1v and see what is heated.

cpu get warm
but its not short circuit
it just use 1A and cpu softly get warm

Serguz05

R EZ A писал(а):

+1_2VDIMM looks short to ground: 1 Ohm

there should not be 1om. If only the processor is heating up, then it is most likely bad.
p.s. and most likely RAM too.

R EZ A

Serguz05 писал(а):

there should not be 1om. If only the processor is heating up, then it is most likely bad.
ps and most likely RAM too.

for last test i decided to put G5316RZ1D and mosfets
surprisingly it doesn't burn and 1.2V runs normally!
but with or without ram uses same current:0.3A
and no VCC_CORE,VCCSA or VCC_GT
EC_ALLSYSPG = 3.3V

Serguz05

what is the resistance.
---------- Добавлено спустя 6 минут 39 секунд: ----------
you can try flashing the bios. MSI website has clean bios and ME dump.

R EZ A

Serguz05 писал(а):

what is the resistance.
---------- Added after 6 minutes 39 seconds: ----------
you can try flashing the bios. MSI website has clean bios and ME dump.

its 2.2 omh now
i already tried dump file in forum
also flashed file from msi website and all was same

Serguz05

R EZ A писал(а):

for last test i decided to put G5316RZ1D and mosfets
surprisingly it doesn't burn and 1.2V runs normally!

R EZ A писал(а):

its 2.2 omh now

this resistance in the RAM power circuit is extremely low.
there is no point in flashing bios.

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CX62 (MS-16J71) No turn on after water damage

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