Can anyone identify this chip - Page 1
Forum section: electronics / repair

author: tk1
author_rank: Newbie
timestamp: July 04, 2015, 09:47:28 am
content: Hi,Is anyone able to identify this chip and a proper replacement?I am trying to repair an Asus laptop motherboard.Any help is appreciatedThank you

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: July 04, 2015, 09:57:27 am
content: I would assume it's some kind of TVS diode array.

author: poorchava
author_rank: Super Contributor
timestamp: July 04, 2015, 11:22:27 am
content: Might be hard to find a generic replacement, to as TVS arrays are often targeted at specific applications. For example CDSOT23-720 is specially targeted for RS-485 interfaces.Sent from my HTC One M8s using Tapatalk

author: dfmischler
author_rank: Frequent Contributor
timestamp: July 04, 2015, 12:12:39 pm
content: If you can find the service manual for that board (ASUS K55VD REV 3.0: it probably exists), it should give you a part number. Good luck.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: July 04, 2015, 12:15:17 pm
content: Googling for "k55vd asus pcb" brings up interesting pictures from apolish forum:The connector is described as power jumper there. They couldn't identify the chip either.I fear that looking for a SOT23-6 TVS diode array with the marking "21" could be somewhat difficult.

author: Deathwish
author_rank: Unknown
timestamp: July 04, 2015, 03:29:34 pm
content: just for you.http://www.nxp.com/documents/data_sheet/IP4223CZ6.pdf

author: ez24
author_rank: Super Contributor
timestamp: July 04, 2015, 05:28:31 pm
content: Any chance it could be thishttp://www.diodes.com/datasheets/BAS21TW.pdfif you do not think the last marking is a "t" but a vertical marking YM (year month)look at the "marking" section

author: Deathwish
author_rank: Unknown
timestamp: July 04, 2015, 06:26:26 pm
content: The part i posted is directly taken from the asus boardview diagram with part numbers etc.

author: tk1
author_rank: Newbie
timestamp: July 04, 2015, 07:17:00 pm
content: Thank you all so very much. Thank you so much Deathwish, huge help, hopefully now I locate the proper replacement.

author: Deathwish
author_rank: Unknown
timestamp: July 04, 2015, 08:55:57 pm
content: If you go here and join up, you can then download the files yourself to look at.http://badcaps.net/forum/showthread.php?t=45306

author: tk1
author_rank: Newbie
timestamp: July 04, 2015, 09:02:24 pm
content: cool, thanksalso, I just ordered the chip... actually 25 of them to make it worth while with shipping and all... lol

author: Deathwish
author_rank: Unknown
timestamp: July 04, 2015, 09:09:20 pm
content: 25 !,oh well you can blow a few then, send us pics of the magic smoke....If you download those files and run up boardview it will be in chinese , go to the top of the window and click the third from the right, then the second one down and change the language to English. then press CTRL+F10 to load the file in ok.you will need to load the file named K55VD 3.1,60-N8DMB1800-B03.FZ into the sub directory calle fab in the main programme directory then when pressed ctrl+f10 to load it paste the name minus the extension in the pop up box and then ok. you then need to use the RefDes box to drop down to the part you are looking for by its board designation. it will tell you what part it is in that.

author: tk1
author_rank: Newbie
timestamp: July 04, 2015, 09:12:37 pm
content: ok coolthank you again for your help, hopefully the motherboard will be functional after the repair (crosses fingers) lol

author: Deathwish
author_rank: Unknown
timestamp: July 04, 2015, 09:15:30 pm
content: i just edited the prior post to explain how to load it up

author: tk1
author_rank: Newbie
timestamp: July 04, 2015, 09:17:18 pm
content: ok thanks

author: mcinque
author_rank: Unknown
timestamp: July 04, 2015, 09:19:58 pm
content: Well played Deathwish!@tk1: I guess that if it's an ESD protection like Deathwish posted, the mainboard should work even with that part blown (unless it's shorted?), don't you?What are the symptoms other than that component blown? I guess that to damage that ESD protection in such way, you need just a lot more energy than ESD, so maybe there is something that could be damaged other than that component. What do you think about this?