Asus R702UA dead (missing voltage)

[alderick]

Hello guys,

I have this laptop, can't figure it out what is the problem.
The battery is dead 2V.
Few month ago the laptop died but just remove the battery 30sec and it went alive.
This time is different, I have 3.3V, 5V, 0.8V and 1.1V power supply alive even it's off, when I try to power on, white LED light, but no change on power supply, 4 of them still dead 0V (CPU and RAM)

What should I check?

Thanks!

Mainboard sticker say X705UAR, mainboard itself is X705UQ V2.2

[Techtiger]

Re: Asus R702UA dead (missing voltage)

Bordview is not out try to request in Schematic section CPU Core coils will not genarate until RAM section is cleaired upload pic of the MB & mark the Voltages one the coils RAM IC number ? RTC section is Good ?

[alderick]

Re: Asus R702UA dead (missing voltage)

Thanks for reply.
I join a pic of the mobo with color spot, here the value:

left red 3.32V
left yellow 5.18V
left green 1.87V

blue 1.03V
purple 0V
white 0V
right red 0V
right yellow 0V

3.25V on bios chip


The IC under ram power suply is uP9002P 8GR920
The IC for CPU is NCP81236A

I you want closer photo on a small zone I can do it.

Thanks.

[Techtiger]

Re: Asus R702UA dead (missing voltage)

Thanks for reply.
I join a pic of the mobo with color spot, here the value:

left red 3.32V
left yellow 5.18V
left green 1.87V

blue 1.03V
purple 0V
white 0V
right red 0V
right yellow 0V

3.25V on bios chip


The IC under ram power suply is uP9002P 8GR920
The IC for CPU is NCP81236A

I you want closer photo on a small zone I can do it.

Thanks.

PWM CONTROLLER UP9002 pin 4 3 7 8 14 voltage ? & the 2 Mosfets connected to PWM check if no short on the 2 fets & the voltage of them , resistance to GND on coils with 0V

[alderick]

Re: Asus R702UA dead (missing voltage)

PWM CONTROLLER UP9002 pin 4 3 7 8 14 voltage ?

All of these are 0V

the 2 Mosfets connected to PWM check if no short on the 2 fets & the voltage of them , resistance to GND on coils with 0V

Not sure about the first part, but mosfet not shorted D/S or with G either.

Ram coil to GND 166ohm
RED coil 16 ohm
white coil 8 ohm
purple coil 80 ohm

With that 2 low resistance I believe there is something wrong with CPU?

[mcplslg123]

Re: Asus R702UA dead (missing voltage)

Perhaps "Deep Sleep Well" issue. Do you have dc power supply?? If yes, then measure the consumption in off mode. Have you flashed bios??

@techtiger, you may get core voltage but no ram voltage on coil in soc platform as soon you plug the adapter. Just solved such a case on quanta Y11A mb where consumption was 0.080A as soon as you plug in dc supply with no dc jack light but vcore @1.72V present but no ram volatge on coil. It was a problem with DSW and that's the reason 3/5V ALW always remain on.

[Techtiger]

Re: Asus R702UA dead (missing voltage)

@techtiger, you may get core voltage but no ram voltage on coil in soc platform as soon you plug the adapter. Just solved such a case on quanta Y11A mb where consumption was 0.080A as soon as you plug in dc supply with no dc jack light but vcore @1.72V present but no ram volatge on coil. It was a problem with DSW and that's the reason 3/5V ALW always remain on.

i have not come a cross but very interesting mcplslg123 Thanks

[alderick]

Re: Asus R702UA dead (missing voltage)

Hello mcplslg123, thanks for your help.
I have DC poxer supply, the board take 19mA when off, and 22mA when "on"
I try lot's of me clean, rebuild bios and even reflash ITE, nothing change.
Any ideas?

[Techtiger]

Re: Asus R702UA dead (missing voltage)

All of these are 0V



Not sure about the first part, but mosfet not shorted D/S or with G either.

Ram coil to GND 166ohm
RED coil 16 ohm
white coil 8 ohm
purple coil 80 ohm

With that 2 low resistance I believe there is something wrong with CPU?

since SOC cpu those coils show most of the time low resistance RAM coils also good what is your ITE XXX ?

[alderick]

Re: Asus R702UA dead (missing voltage)

It's an ITE IT8995E-128

[alderick]

Re: Asus R702UA dead (missing voltage)

Hello guys,

Can you explain the deep sleep well please.
Do you think it's my problem?
If not, any ideas?

[Techtiger]

Re: Asus R702UA dead (missing voltage)

It's an ITE IT8995E-128

check pin 83 1.2V ON

[alderick]

Re: Asus R702UA dead (missing voltage)

pin 83 is 0V

[Techtiger]

Re: Asus R702UA dead (missing voltage)

pin 83 is 0V

ok that's Bad now check pin 35 57 82 96

[alderick]

Re: Asus R702UA dead (missing voltage)

35 is 0V
57 0V
82 0V
96 3.3V

[Techtiger]

Re: Asus R702UA dead (missing voltage)

35 is 0V
57 0V
82 0V
96 3.3V

does the pin 96 RSMRST when press PWRBTW goes to 0V & come back to 3.3V you have to check the requarments of the SIO now par exemple VACC VA EC ect

[alderick]

Re: Asus R702UA dead (missing voltage)

The pin 96 stay at 3.3V when I press the power button, while the white LED goes on.

Edit: found pin, VACC is 3.3V and VA_EC is 3.3V too.

[Techtiger]

Re: Asus R702UA dead (missing voltage)

The pin 96 stay at 3.3V when I press the power button, while the white LED goes on.
Do you have datasheet of this SIO or tell me which pin are VACC and VA EC?

Thanks a lot!

no commutation between SIO PCH may be BIOS i have uplode Bordview & Asus X556UV this is the closest

[alderick]

Re: Asus R702UA dead (missing voltage)

Thank you, I've edit my previous post in the meantime.
Should I upload my bios and EC backup?

[Techtiger]

Re: Asus R702UA dead (missing voltage)

Thank you, I've edit my previous post in the meantime.
Should I upload my bios and EC backup?

check pin 21 56 110 108 97 85 21 14 yes up lode in BIOS section some one will help you what is the BIOS ic pins resistance to GND find out if the 3/5ALWS go to +3VS form the bordview