Toshiba Portege Z30-A - Burned Chip Identify

[kodox]

received unit with no power at all, pluged bench PSU and not consuming any amperage, measurement shows that 19V only reaching first mosfet & gate voltage only 6V.
visual inspection found that it has burned chip, marking code wasn't too clear under microscope, i guess it's "A C C I". the chip is located under huge diode with UCQ1QA03 marking on it, since i don't find any schematic or boardview for this model, wandering that someone had similiar board and kindly measure what voltage comeout from the inductor connected to that chip or maybe knew what model number of the chip

Board code: FAUXSY4 A3805A

[kodox]

Re: Toshiba Portege Z30-A - Burned Chip Identify

anyone...?

[Fraheeba]

Re: Toshiba Portege Z30-A - Burned Chip Identify

Hi kodox, chip marking code is ACCI, voltage at the 220 inductor is 5V (standby), and at 1R5 inductor, it's 1.35V when notebook is switched on.
However, my board code is FAUXSD3 A3669A, but I guess that shouldn't matter. Hope this helps.

[mon2]

Re: Toshiba Portege Z30-A - Burned Chip Identify

MAX1836EUT50

Just found this amazing item on AliExpress. Check it out! US $2.16 | Original genuine goods in stock MAX1836EUT50+T ACCI SOT23-6
https://a.aliexpress.com/_m02cWeS

https://www.mouser.com/ProductDetail...s5WQ69pQ%3D%3D

[kodox]

Re: Toshiba Portege Z30-A - Burned Chip Identify

Hi kodox, chip marking code is ACCI, voltage at the 220 inductor is 5V (standby), and at 1R5 inductor, it's 1.35V when notebook is switched on.
However, my board code is FAUXSD3 A3669A, but I guess that shouldn't matter. Hope this helps.

thank you sir...
it helped me a lot to continue troubleshoot the unit, though it's kinda weird why it has separated step-down converter for standby?

anyway, thank's for the info

MAX1836EUT50

Just found this amazing item on AliExpress. Check it out! US $2.16 | Original genuine goods in stock MAX1836EUT50+T ACCI SOT23-6
https://a.aliexpress.com/_m02cWeS

https://www.mouser.com/ProductDetail...s5WQ69pQ%3D%3D

you're the man @mon2
but since there were no local seller in my country, i think i'll be using universal buck-converter module that had similiar function for this, but thank's for the datasheet