Asus VG279QM Help identify ic SMD marking

[tehmatix]

Hi,
I'm dealing with an Asus monitor VG279QM which doesn't turn on, no any LED's on.
On the main board I found multiple power sources connected to 19V.
One is getting hot and the output is 0,6V.
I need to identify the chip which is marked with AWCM232

[PeteS in CA]

Re: Help identify ic SMD marking

I can't help much, but it looks like it might be a DC-DC converter IC,

[R_J]

Re: Help identify ic SMD marking

Looks like a MPS qfn-16, might be custom markings

[R_J]

Re: Help identify ic SMD marking

Looks like it may be a MP2229 but with different marking

[tehmatix]

Re: Asus VG279QM Help identify ic SMD marking

Thank you for replies,

Following the circuit output I found a direct connection with the audio amplifier which is a chip APA2604C operating voltage: 3.3V-5.8V. So my IC is delivering at the output 5V. From datasheet of MP2229 the feedback network resistor values are for 5V and its matching with what is on my board.

The winner is MP2229 !!!, but the markings are different.

What could be the reason for damaging this chip ?

[R_J]

Re: Asus VG279QM Help identify ic SMD marking

It may be that the audio amp. ic is bad, shorted and killing the voltage.

[tehmatix]

Re: Asus VG279QM Help identify ic SMD marking

What I did next was to isolate this power supply by removing the coil and come with an external one, 5V. The monitor, powered up from two power sources 19V and 5V, turn on and on side of 5V its takes 0,9A at FHD resolution.