Help Identifying Components - I have searched everywhere including this forum

[sukagr]

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 these
AAF07
IA7BJ

Any help gratefully received

Thank you
Adrian

[EHT]

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?

[fzabkar]

AAF = MAX4502

https://datasheets.maximintegrated.com/en/ds/MAX4501-MAX4502.pdf

I 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=aaxxx
http://www.smdmark.com/en-US/search/code?id=aafxx
http://chip.tomsk.ru/chip/chipdoc.nsf/vc1!readform&view=smd&cat=A&start=3500&count=500

I suspect that AAF is an LDO regulator. The pinout seems to match this:

https://www.mouser.com/datasheet/2/792/rp107-ea-1770685.pdf

What 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

[BreakingOhmsLaw]

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?

If you suspect the components is from a Chinese manufacturer, use baidu.com instead.

[gamalot]

AAF07 is AME8801AEEV

http://www.ame.com.tw/datasheet/AME8801_8812_8840.pdf

IA7BJ could be MP3204DJ

https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP3204/document_id/1497

[sukagr]

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.

[sukagr]

Second picture did not upload.  Here are my goto SMD DBs if anyone knows of others please share.

baidu.com noted thanks.

many thanks
Adrian.

[gamalot]

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

[fzabkar]

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.

Pins 1 and 6 are connected to an inductor, so they will appear to be shorted.