IC datasheet

[jasko_jacker]

I'm searching up1661p datasheet or equivalent ic to solve an issue on an asus x555la because when it's connected with +5VS_PWR creates problems on the entire line of +5VS
thanks

[keeney123]

Re: IC datasheet

I sent in a request to the UPI folks to get the data sheet. We will see if they get back to me.

[meritosari]

Re: IC datasheet

May be equivalent with RT8813A.

Check on schematic Compal LA-A992P P.53

Only Pin 15 up1661 not connect directly to pin 24 on same IC. there is chance PR8538 as fuse or 0 ohm (according in boardview in another your thread)

[jasko_jacker]

Re: IC datasheet

Thanks for the link
The situation is in standby because if I disconnect the GPU power coil (PL8501 and PL8502) the +5VS_PWR is stable and the board finally goes on, but remain to understand where is the issue.
No voltage on disconnected coil:
1) the up1661p needs some feed from GPU and from +NVDD (vccsense and vddsense and other)
2) the up1661p is damaged !!!
I have checked all the capacitors on +NVDD and those on GPU are not shorted
Any idea ?

[meritosari]

Re: IC datasheet

Of course if coil has been removed the circuit won't work. ( Not Switching).

if there are not have short:
-input
-enable
-output
-feedback

I think you may make replacement for the IC and totally with careful

[keeney123]

Re: IC datasheet

So here is the UPI contact perhaps they will reply to you. 'jessie_liu@upi-semi.com'