Need help for SMD part identification in Wacom Cintiq 21ux DTZ-2100/G (SOLVED!)

[Koray]

Hi all,

I received a Wacom DTZ-2100 in non working condition. Before testing anything I looked at the boards and identified a blown 8 pin SMD chip on the mainboard. It is very damaged and only few digits can be observed. There is an identical board (with some extra components) on sale on Aliexpress. There is a photo of the board on that listing but it is impossible to read the component text.  I requested a better photo from the seller but I am not sure if they will help. The Aliexpress board is not economic to buy for fixing the device.

https://www.aliexpress.com/item/4001145015060.html
https://ae01.alicdn.com/kf/H60898fe3c8fc4d8aae237bc7e61e4425h/Planar-Px212m-Driver-Board-00-61601gf01-RER-F-80-61610g001-Mainboard.jpg

I am including the photos of the blown chip, below. Is it possible to decipher the ID of this chip? I have outlined some numbers that I can identify. I am not sure which row I should focus on? If you think it will help I can take more pictures.

Thanks in advance.

Koray

[fzabkar]

It must be a PWM controller. It drives an external MOSFET and flywheel diode. Can you help us by determining the pinout?

There is a 3.3V linear regulator made by AIC at the top of the photo. Perhaps your damaged IC is also made by AIC?

Here is an example:

https://www.semiee.com/file/EOL/Analog%20Integrations%20-AIC1577.pdf
https://s3.bukalapak.com/img/3202996225/large/BU99.jpg

See page 2 of this guide for an idea of what chips were available in 2005:

https://web.archive.org/web/20051125211130/http://www.analog.com.tw/DB/appfile/s-guide.pdf

[Koray]

Thank you! This is helpful. I will take more photos and identify the connections of pins. I think I can place traces of numbers 157 on the blown part. I will take more photos.
K.

[fzabkar]

Another one:

https://m.media-amazon.com/images/I/51Km9qhVM-L._AC_UF894,1000_QL80_.jpg  (AIC1578CS)
https://i.ebayimg.com/images/g/If0AAOSwnhxci8NG/s-l1600.jpg  (AIC1578PS)

http://www.analog.com.tw/p2_6_detail.asp?hidShowID=45&hidTableName=05
http://www.analog.com.tw/ImgShow/DS-1578G-01.pdf  (datasheet)

[Koray]

I think you are right, it is AIC1578PS. I followed the pins and they match with the diagram below, both at the Vin side, and the transistor and diode and ferrite coil side. I took a new picture and now I can make out the letters better.
I will order this part to start with. Thank you very much for your help!
I will keep you updated.
K.

[Koray]

Hi there! SUCCESS!

It was AIC1578PS. I received the part today and put it on the board. Works perfectly!

Thank you very very much! We saved another equipment from the landfill. I appreciate your effort.

Kind regards,

Koray