X550jx black screen but cpu heating up

[questore]

Hello everyone thanks for your time reading this.

I have an asus x550jx laptop. The internal screen has given up so i only have external monitor to test.
The last two days when the laptop was working it was extremly slow (only like 3fps) when i tested gpu-z but working without a problem. One day i have a BSOD and then windows halted on boot with TRAP 00000030.
Removed every hdd, dvd drive but windows usb installer still thrown trap 30. Then after some restart the asus logo freezed uppon post and thats all. Black screen since then. 1 min powerbutton without any battery,cmos or ac connector but still the same.

Symptoms:
after power removed and 1 min power button holding, it starts with power+ num lock + caps lock lit, no blinks. Can only power off by holding power button for 6 sec. Then 2nd power on. Still blackscreen but onyl power+num lock lit. Cpu is slowly heating up after some time, and cpu fan starts to spin.
Tried ctrl+home bios flash but not seeing anything so dont know if it worked.

[questore]

Re: X550jx black screen but cpu heating up

further info:
Got an USB pendrive with led indicator, ctrl+home not racting to and bios file naming. X550JX.bin X550JXAS.bin X550JX.rom X550JXAS.rom X550J.bin X550J.rom. When i hit power button the usb led flashing once and thats all.

[Techtiger]

Re: X550jx black screen but cpu heating up

further info:
Got an USB pendrive with led indicator, ctrl+home not racting to and bios file naming. X550JX.bin X550JXAS.bin X550JX.rom X550JXAS.rom X550J.bin X550J.rom. When i hit power button the usb led flashing once and thats all.

You need a Special tool to do this job & a working BIN , dissemble the MOB & find out what voltages are missing on the BIG GRAY Coils , check this out https://www.badcaps.net/forum/showthread.php?t=88758

[questore]

Re: X550jx black screen but cpu heating up

Thanks I have very few spare time but maybe i learn something. Tools... i have everything i think. I post the results of voltages when i have them. Thank you.

[questore]

Re: X550jx black screen but cpu heating up

Can anyone link me a schematic diagram? (I have found the Boadview)

[questore]

Re: X550jx black screen but cpu heating up

Just had to ask for it and found it

Block diagram for X550JF/X550XJ

Boardview:X550JF/X550JX

https://www.badcaps.net/forum/showthread.php?p=995106

.

[questore]

Re: X550jx black screen but cpu heating up

I have measured the following values:

ALL_SYS_PWRGD 3,35v
VCCIN 1,745v
VRM_PWRGD 3,36v
CORE_PWRGD 3,3v
PM_PWROK 3,3v
H_DRAM_PWRGD + - + - + -
DRAMPWROK 0,877v
PM_SYSPWROK 3,3v
BUF_PLT_RST 3,3v
+NVDD 0,89v

Seems that the ram power is not high enough as i see it.
Anyone have an idea where to go next?

[Techtiger]

Re: X550jx black screen but cpu heating up

Yep on bord RAM ? Try with a another Ram find out the voltage on RAM slot DRAMRST May be pin 30

[questore]

Re: X550jx black screen but cpu heating up

Yep on bord RAM ? Try with a another Ram find out the voltage on RAM slot DRAMRST May be pin 30

With only onboard RAM yes!
DRAMRST 1.35V with another ram in slot.

[Techtiger]

Re: X550jx black screen but cpu heating up

check the voltage on R0338 R0341

[questore]

Re: X550jx black screen but cpu heating up

check the voltage on R0338 R0341

DRAMRST 1.35V with 1 extra ram in slot. (both R0338 R0341)

[questore]

Re: X550jx black screen but cpu heating up

Should i check DRAMPWRGD shorted?

[Techtiger]

Re: X550jx black screen but cpu heating up

DRAMRST 1.35V with 1 extra ram in slot. (both R0338 R0341)

what is the voltage on R0332 both sides ? what is the value of the resistor R0332 R0338 check with the multimeter with out power

[questore]

Re: X550jx black screen but cpu heating up

Without power:
R0332 - 50.3 Ohm
R0338 - 1.7 kOhm

Voltage i will check tomorrow cause cpu is heating if i remove the heatsink and the R0332 can only be measured if heatsink is off. I figure something out

[questore]

Re: X550jx black screen but cpu heating up

R0332 - 0V
both left and right side is 0 voltage.

What's next?

[questore]

Re: X550jx black screen but cpu heating up

More information to you:
PL8001 and PL8003 both +VCCIN and should be 1,745v but PL8001 is 0v. What the hell?

[questore]

Re: X550jx black screen but cpu heating up

A short followup about private messages:
- R0322 is a shorted place and measured also 0.8v
- R0342 is an empty place. Both side 0v

The next step would be to measure the followings:
- both side of R0338 R0335 R0337 R0336
- U0303 all pins

durring the measures the laptop condition changed:
Now it starts and Power+Caps lock LED lights up and stays on but after 10 seconds, the laptop shuts off.

[questore]

Re: X550jx black screen but cpu heating up

A short followup about private messages:
- R0322 is a shorted place and measured also 0.8v
- R0342 is an empty place. Both side 0v

The next step would be to measure the followings:
- both side of R0338 R0335 R0337 R0336
- U0303 all pins

durring the measures the laptop condition changed:
Now it starts and Power+Caps lock LED lights up and stays on but after 10 seconds, the laptop shuts off.

I have made a stupid mistake. CPU fan was not correctly plugged, thats why condition changed.

Update. Only Numlock+power led stays lit.
Measurements:
- U0303 Pins.
1. 3.3v
2. 3.3v
3. 0v (GROUND)
4. 0.8v (also checked its not sorted to ground)
5. 3.3v

R0335
1. 1.35v
2. 0.8v

R0336
1. 0.8v
2. 0v (ground)

R0337
1. 3.3v
2. 3.3v

R0338
1. 0.8v
2. constanly changing (cant measure)

[questore]

Re: X550jx black screen but cpu heating up

I'm thinking that accoring to datasheet SOT353 5 pin:
if the
input1=HIGH (3.3v) and
input2=HIGH (3.3v) and
VCC=3.3v
then isn't the output should be 3.3v??

Does U0303 faulty?

[questore]

Re: X550jx black screen but cpu heating up

Measured further cause power sequence should point the problem:
PM_SYSPWROK 3.3v
BUF_PLTRST 3.1v
PCH_PLTRST_CPU 1.0v

Ordered a BIOS USB flasher and try to flash chip