NM-A281 SY8206BQNC 3,3V output issue

[rookieme]

I have the NM-A281 with fried the KBC.
I also noticed that the SY8206BQNC [pu401] that provides the 3,3 V gives 3,83V at +3VLP and at +3VALW.
That must be a good reason why KBC was fried.
I removed the KBC and measured the parts that regulate the output in my opinion - the PC411, PR407, PR444 and the PC403 are ok.
Also I replaced the SY8206BQNC but i get the same output that is too high.
I placed a new KBC and also noticed that U13 burns hot I guess by the efford to regulate down as I get 3,07 & 4,94 at the ouput [no short at output].
Any suggetions what goes wrong and I get too high voltage instead of 3,3V?

[mielta]

Re: NM-A281 SY8206BQNC 3,3V output issue

Hi
Wich voltage you have on PU401 En1+2
when you cut PJ402 is the voltage always 3,8V

[rookieme]

Re: NM-A281 SY8206BQNC 3,3V output issue

PU401 pin1 has 3,82V and pin2 0V

nice, by cutting PJ402 I get 3,34V at +3VALW_P and at +3VLP
also PU401 pin1 now is 3,33V and pin2 3,76V.

I'm guessing you have faced that before?

U13 still runs hot

[mielta]

Re: NM-A281 SY8206BQNC 3,3V output issue

Check pu402 voltage +5valw

[mielta]

Re: NM-A281 SY8206BQNC 3,3V output issue

i think it is problem +5valw or u13 is defect

[rookieme]

Re: NM-A281 SY8206BQNC 3,3V output issue

+5valw is 5,1 V and seems fine
ok U13 is faulty, without it and with PJ402 closed I get 3,3V
now long time waiting for a replacement
thank you for your time!

[mielta]

Re: NM-A281 SY8206BQNC 3,3V output issue

with pleasure

[islammostafa.me19]

Re: NM-A281 SY8206BQNC 3,3V output issue

thanks

[imranromi]

Re: NM-A281 SY8206BQNC 3,3V output issue

I have the NM-A281 with fried the KBC.
I also noticed that the SY8206BQNC [pu401] that provides the 3,3 V gives 3,83V at +3VLP and at +3VALW.
That must be a good reason why KBC was fried.
I removed the KBC and measured the parts that regulate the output in my opinion - the PC411, PR407, PR444 and the PC403 are ok.
Also I replaced the SY8206BQNC but i get the same output that is too high.
I placed a new KBC and also noticed that U13 burns hot I guess by the efford to regulate down as I get 3,07 & 4,94 at the ouput [no short at output].
Any suggetions what goes wrong and I get too high voltage instead of 3,3V?

I face same problem like 10 time problem found sound ic short to gnd..