Display problem Asus Rog G750JX G750JZ

[thinkfast76]

I have a problem with these two notebooks, both of which work on external monitors but not on their displays.
All this after trying to reverse the monitors.
The G750JX has a FHD 120hz display while the G750JZ is 60hz, I think this has caused the damage, I attach the photo of the power supply circuit of the G750JX display with a burned mosfet.
I would need the schematic or good advice to solve the problem. Thanks

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

its Q45502 N-MOSFET PMN45EN TSOP-6
Pin 1 +LCD POWR S
Pin 2 +LCD POWR S
Pin 3 L VDDEN RR
Pin 4 +LCD POWR S
Pin 5 +LCD POWR S
Pin 6 +LCD POWR S

hope it will be help full

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

its Q45502 N-MOSFET PMN45EN TSOP-6
Pin 1 +LCD POWR S
Pin 2 +LCD POWR S
Pin 3 L VDDEN RR
Pin 4 +LCD POWR S
Pin 5 +LCD POWR S
Pin 6 +LCD POWR S

hope it will be help full

THX a lot , i try with this

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

So this make me mad .........

I check G750JX J4701 connector and i try this I found these tensions:
pin 1-2-3 19v
pin 4 0

from 9 to 18 5v
Pin 22 0,24v
from 23 to 37 0v
pin 38 3v
pin 40 3.20v

I would like to change all the connected components that give 0, or if someone can tell me the specific that could be damaged, I would be really grateful

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

pin 23 to 38 are signels you have to use DSO
pin 22 Ov or 24V ? it should be 3.3V
Pin 9 to 18 if it’s LCD VDD it must be 3.3V

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

pin 23 to 38 are signels you have to use DSO
pin 22 Ov or 24V ? it should be 3.3V
Pin 9 to 18 if it's LCD VDD it must be 3.3V

PIN 22 is 0V

ANd sorry , what's DSO?
BTW , why i have this wrong voltage on 9 to 24 and 22?
THx a lot mate

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

DSO Oscilloscope
for the BL EN 3.3V test R4509 both side C4506 D4502 D4501 R4509 R4513 all Voltage's
in you Mob do you have J4501 ?
for LCD POWR 3.3V Q4503 all pin

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

DSO Oscilloscope
for the BL EN 3.3V test R4509 both side C4506 D4502 D4501 R4509 R4513 all Voltage's
in you Mob do you have J4501 ?
for LCD POWR 3.3V Q4503 all pin

So i test:

R4509 1 2,30v 2 0,24v
c4506 1 0,25v 2 0v
d4501 1 3,25v 2 3,25v 3 0,25v
d4502 1 0,25v 2 3,25v 3 0,25v
r4513 1 0,23v 2 2,3v
q4503 5,09 drain 0 gate 0 source


Hope that y can help me

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

now test Q4501 pin 2.3.5.6

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

and test L4501 both sides

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

now test Q4501 pin 2.3.5.6

Thx my friend

IK check this on q4501:
2 3,2v
3 8,5v
5 0v
6 0v

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

and test L4501 both sides

Ok i wil check this too

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

L4501
1 5v
2 5v

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

So i test:

R4509 1 2,30v 2 0,24v
c4506 1 0,25v 2 0v
d4501 1 3,25v 2 3,25v 3 0,25v
d4502 1 0,25v 2 3,25v 3 0,25v
r4513 1 0,23v 2 2,3v
q4503 5,09 drain 0 gate 0 source


Hope that y can help me

R4509 resistor is suspected in put 5V out put 2.30V this voltage goes through L4507 to pin 22 of J4701 (BL EN) 5V
this 4 SMD compontents are connected with R4509, first check C4506 cap short then test D4502 D4501 R413 with the help of the multimeter with out power
if you can remove D4501 & R413 and power up and test weather the R4509 out putting 5V

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

R4509 resistor is suspected in put 5V out put 2.30V this voltage goes through L4507 to pin 22 of J4701 (BL EN) 5V
this 4 SMD compontents are connected with R4509, first check C4506 cap short then test D4502 D4501 R413 with the help of the multimeter with out power
if you can remove D4501 & R413 and power up and test weather the R4509 out putting 5V

seen today r4509.
On my card is not present, I only saw the tensions on the pitches, but the component does not exist.
How is it possible?

[Techtiger]

Re: Display problem Asus Rog G750JX G750JZ

what are the component not exist R4509 ? or the rest did you replace the Fet that was burned

[thinkfast76]

Re: Display problem Asus Rog G750JX G750JZ

what are the component not exist R4509 ? or the rest did you replace the Fet that was burned

r4509 dont exist, i check just the pad, l dont replace it