help again, I cant determine what type of this IC, MU4LA

[kazia]

I cant determine what type of this IC, MU4LA
any one know?
and what substitution for this ic?

[kotnatan]

which platform (marking) motherboard?

[kazia]

Originally Posted by kotnatan

which platform (marking) motherboard?

it's asus x450j.

SV41 JN MB
13320-1
448.01P03.11

only that printed on the board,
and only one ic is bad the other one is work, I have switch that two ic's.
that ic's is look like sy8208dqnc which code MU3XX, try it and not work.
http://www.*******************/detail/...dqnc-1132.html

[kotnatan]

Pu4801 - sy8208bqnc

[kazia]

Originally Posted by kotnatan

Pu4801 - sy8208bqnc

I'll try it and report here if it work... thank's

[kazia]

Hi... already try sy8208bqnc from here :
http://www.*******************/detail/...bqnc-1134.html
but still not work,
any suggestion...

[meritosari]

what exactly your problem?
-Doesn't react to power button and doen't charge the battery + led the adapter off immediately
-Doesn't react to power button and doesn't charge battery
-Doesn't react power button but the battery charging is working
-Power up but the battery charging doesn't work
-Power up but then shutdown immediately
-Power up but doesn't display anything on the screen

[kazia]

Originally Posted by meritosari

what exactly your problem?
-Doesn't react to power button and doen't charge the battery + led the adapter off immediately
-Doesn't react to power button and doesn't charge battery
-Doesn't react power button but the battery charging is working
-Power up but the battery charging doesn't work
-Power up but then shutdown immediately
-Power up but doesn't display anything on the screen

* Power up but doesn't display anything on the screen

only on that output ic's volt missing, one ic work and the other not. compare that two ic identically.

[kazia]

any one can help...

[meritosari]

didn't find schematic and datasheet the IC, if I see from kotnatan's pic the IC for PWR_1D05V rail

Did you get voltage on pin#1 pwr_1d05v_en?

try register on http://****************/load/noutbuki/306 you'll find boardview for this model, you should pass the test first. then search asus x450jn

[meritosari]

This part of schematic as reference that I hope would help you, taken from compal/lenovo G505s

[fzabkar]

The SY8208 part was manufactured by Silergy (it was also the subject of a patent infringement case). AFAICT it has at least three versions -- adjustable (DQNC), 3V fixed (BQNC), 5V fixed (CQNC).

Note that the suffix is VERY IMPORTANT.

Page 38 of the following schematic shows a SY8208DQNC_QFN10_3X3:
http://www.datasheetcafe.com/wp-cont...SY8208BQNC.pdf

The Compal circuits show a SY8208BQNC_QFN10_3X3 on page 1 (PU401), a SY8208CQNC_QFN10_3X3 on page 1 (PU403), a SY8208DQNC_QFN10_3X3 on page 2 (PU701) & 3 (PU451):

http://www.badcaps.net/forum/attachm...4&d=1450291182

More schematics ...
http://kythuatphancung.vn/uploads/do..._r1.0_2014.pdf

The SY8208DQNC incorporates an adjustable step-down switchmode converter with a feedback reference voltage of 0.6V.

The SY8208BQNC appears to be a fixed 3V converter, and the SY8208CQNC appears to be a fixed 5V converter.

[kazia]

Big Thanks to every one, problem solved,
yes the IC is sy8208DQNC adjustable not fixed voltage.

unfortunately bios is curupped to, that's why this board still not work.
after flash that dump bios, bord working perfectly,

[ktmmotocross]

that could be problem on VGA DDR