Asus gamer f15

[madjid911]

Hi, I have an asus TUF Gaming F15 TUF506HM, motherboard DAONJHBAH0 REV : H, it does not turn on, but charges the battery well.

the charging light is on with the charger

I did not find any shorts, but the graphics card has a very low resistance close to zero (0.8 ohms).

The two bios chips are not powered by 3V3

the power button and the micro controller are powered by 3V3

there are two 3V power chips, 5X=RICHTEK which feeds the microcontroller well in 3v3. And the other chip 7=RICHTEK which does not output anything in voltage, this chip is powered by 20v

Do you believe that the ITE micro controller is defective or that it is the 7J=RICHTEK chip?

If anyone can help me find it, thanks

[Stevedb]

Re: Asus gamer f15

Hi how much resistance do you have on output of 7x chip.
O,8 ohm resistance to ground on gpu coil can be total normal. If you have no short on output is the chip get enabled?

That are the first measurements you must do

[madjid911]

Re: Asus gamer f15

Hi how much resistance do you have on output of 7x chip.
O,8 ohm resistance to ground on gpu coil can be total normal. If you have no short on output is the chip get enabled?

That are the first measurements you must do

Hi, no the chip 7J= is not activated, there is no voltage around except the 20v
phase 1 and 2 : 160 OHMS
resistance ok, no shorts around

[Stevedb]

Re: Asus gamer f15

Then you must check where the chip got enabled . Do you got a short on enable.
The chip can not work till he got enabled. Your problem is probably on enable pin. The chip replacement will not help for that

Regards

[madjid911]

Re: Asus gamer f15

Then you must check where the chip got enabled . Do you got a short on enable.
The chip can not work till he got enabled. Your problem is probably on enable pin. The chip replacement will not help for that

Regards

does anyone have the schemtic of this motherboard with the birdview?

the resistors are ok and are not short, maybe it's ITE that triggers sending the voltage on the chip's enable?

[Stevedb]

Re: Asus gamer f15

Shematic on asus will not be available maybe boardview if you are lucky. We will need then boardnummer

[mcplslg123]

Re: Asus gamer f15

7J chip is used for which circuit? Ram or GPU? This will chip get enable only after turning on. Is your motherboard turning on? If not, check basic requirements of SIO chip first.

[madjid911]

Re: Asus gamer f15

7J chip is used for which circuit? Ram or GPU? This will chip get enable only after turning on. Is your motherboard turning on? If not, check basic requirements of SIO chip first.

I think that the 7J= chip supplies the whole motherboard with 3V3 and 5v, because it is next to the two 3V 5V coils. I believe that the 5X= chip is there to power the power button on the keyboard and the SIO chip simply, and that once the power button is triggered, it sends a signal to trigger the general 3V3 of the 7J= chip. I deduce that either my SIO chip is defective or my keyboard does not work. do you know how to trigger the ignition without the keypad?

[Sephir0th]

Re: Asus gamer f15

The RT8816A has nothing to do with your 3.3V/5V. It controls more likely a power rail for the GPU, for example +1.35VDGPU or similar. The 3.3V LDO for the EC and the +3.3VALW (coil) are usually created from the same IC.
The only reason why you can't make progress is because you're trying to figure it with wrong assumptions so far. If you let the people here lead you, you'll make progress with the diagnose.

So, remove power go for resistance mode and measure resistance of each coil to GND. Share the values on a nice and clear picture of the board (not like the dark picture from before), then repeat the same step with voltages, with power of course. And from there we have something to work with.

[mcplslg123]

Re: Asus gamer f15

5X=RICHTEK . This is your 3v/5v pwm ic and certainly not 7J=