Help Identifying Components - I have searched everywhere including this forum - Page 1
Forum section: electronics / repair

author: sukagr
author_rank: Newbie
timestamp: May 20, 2021, 08:52:20 pm
content: Hi,I am a bit frustrated in trying to fix a Mio cycle computer, I have written to them but they will not share anything, not even a capacitor value.Two components seem to be involved in providing power to the LCD which is non existent at the moment.See photo below, I have searched the SMD databases for both theseAAF07IA7BJAny help gratefully receivedThank youAdrian

author: EHT
author_rank: Frequent Contributor
timestamp: May 20, 2021, 09:03:03 pm
content: Not sure, if Google draws a blank. However, you could first check the various semiconductors with your meter for shorts, and on diode test to see if there is any sign they've failed. Did you have any voltage readings etc?

author: fzabkar
author_rank: Super Contributor
timestamp: May 20, 2021, 09:30:26 pm
content: AAF = MAX4502https://datasheets.maximintegrated.com/en/ds/MAX4501-MAX4502.pdfI suspect that the "I" in "IA7BJ" may be a vertical line or dash as is often used by Monolithic Power in their devices.More possibilities ...http://www.smdmark.com/en-US/search/code?id=aaxxxhttp://www.smdmark.com/en-US/search/code?id=aafxxhttp://chip.tomsk.ru/chip/chipdoc.nsf/vc1!readform&view=smd&cat=A&start=3500&count=500I suspect that AAF is an LDO regulator. The pinout seems to match this:https://www.mouser.com/datasheet/2/792/rp107-ea-1770685.pdfWhat about this??? (I don't think so, but ...)RP154N056A, Ricoh, 1.1+1.8V 300mA SMALL DUAL LDO REGULATOR, marking A7xx, SOT-23-6:https://www.mouser.com/datasheet/2/792/rp154-ea-1076095.pdf

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: May 21, 2021, 11:28:23 am
content: Quote from: EHT on May 20, 2021, 09:03:03 pmIf you suspect the components is from a Chinese manufacturer, use baidu.com instead.

author: gamalot
author_rank: Super Contributor
timestamp: May 21, 2021, 12:21:44 pm
content: AAF07 is AME8801AEEVhttp://www.ame.com.tw/datasheet/AME8801_8812_8840.pdfIA7BJ could be MP3204DJhttps://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP3204/document_id/1497

author: sukagr
author_rank: Newbie
timestamp: May 21, 2021, 04:40:06 pm
content: Hello,Thanks so much for the replies you people are amazing and v. helpful.You were spot on with LDO regulator, see photo for voltages under test.Gamalot wins the prize for MP3204DJ which matches the pins with pin 5 driving the LED on WD F2440VB display which has no power at the moment. Pins 1 and 6 are shorted which I do not think they should be.I looked really hard for these using all the recommended DBs, how you found these remains a mystery to me, IF you have any tips for future searches I would be grateful. Second picture is of my goto list for SMD code searches.Take care and many thanks.Adrian.

author: sukagr
author_rank: Newbie
timestamp: May 21, 2021, 04:44:43 pm
content: Second picture did not upload. Here are my goto SMD DBs if anyone knows of others please share.baidu.com noted thanks.many thanksAdrian.

author: gamalot
author_rank: Super Contributor
timestamp: May 21, 2021, 04:55:44 pm
content: For me, the most frequently used marking code search engine is Taobao. You may need to know a little Chinese to use it.https://s.taobao.com/search?q=MP3204DJ&type=p&tmhkh5=&spm=a2141.241046-my.a2227oh.d100&from=sea_1_searchbutton&catId=100

author: fzabkar
author_rank: Super Contributor
timestamp: May 21, 2021, 08:37:40 pm
content: Quote from: sukagr on May 21, 2021, 04:40:06 pmPins 1 and 6 are connected to an inductor, so they will appear to be shorted.