Help identifying audio amplifier IC's

[Gominalo]

Hi all,
I've been messing around with an old portable iphone doc (Logitech Pure-Fi Express Plus) that doen't plays any audio from the aux input, only scratch when i move the power jack and i don't know some of the IC's. I think the one that is repeated is an OP amp (D4558) and the other a dig pot for the volume control (N1A46J0R).
This speaker uses a TDA7491LP for the audio amplification. Any help would be fantastic.
Thank you.

[madires]

Check the power supply and then follow the audio signal, starting at the aux input.

[JohnnyMalaria]

What's all the dirt/contamination?

[Gominalo]

Check the power supply and then follow the audio signal, starting at the aux input.

I checked the ics supplies and in one of the supposed op amps is half (arround 5v or less).

[Gominalo]

What's all the dirt/contamination?

That dirt looks like cloth fibers or dust.

[fzabkar]

The D4558 is a dual op amp. The manufacturer is Silicore (CHMC).

http://www.silicore.com.cn/product/272.html

FM62429. dual channel electronic volume control:
http://datasheet.elcodis.com/pdf2/76/14/761466/fm62429.pdf

[Gominalo]

The D4558 is a dual op amp. The manufacturer is Silicore (CHMC).

http://www.silicore.com.cn/product/272.html

FM62429. dual channel electronic volume control:
http://datasheet.elcodis.com/pdf2/76/14/761466/fm62429.pdf

Thank you a lot! 
Do you think D4558 could be replaceable with the LM1458? I still have to double check but seems to have one of them bad.

[fzabkar]

I suspect it is a general purpose op amp, so I would think an LM1458 would be OK.

[magic]

It's probably a 4558 type opamp so a notch above 1458. Try to find RC4558, NJM4558, BA4558, something of that sort.

[archil]

just find datasheets. 

[gamalot]

The model number of volume control IC is FM62429, not N1A46J0R.

http://file1.dzsc.com/product/16/04/16/1106295_104145462.pdf