Burned IC's on a Onyx 6 portable speaker Board

MrChips

Joined Oct 2, 2009
34,700
The first three letters appear to be AJY.
However, I cannot find an IC that matches that package. MAX6762 shows up as AJY but I don't think that is the IC.

Texas Instruments make a series of audio amplifiers in the TPA700 and TPA6100 series.
TPA6111 = AJA
TPA321 = AJB
TPA731 = AJC
TPA741 = AJD
TPA6100 = AJL
TPA6101 = AJM
TPA6102 = AJN

They all appear to match the PCB layout and all appear to be good candidates.
Unfortunately, no listing on the AJY part.

I will keep searching,
 

Thread Starter

bad_electrician

Joined Mar 21, 2025
2
It is SY8213 DC-to-DC step-down converter.

Marking code is AJYxyx
x = year code
y = week code
z = lot number code

Note that there is GND pad (or paddle) labeled as pin-9 underneath the IC package.
Wow that's amazing !
Thanks a lot!
I'm not experienced in troubleshooting PCP's. Do you think if I change these two there is a big change it will work?
 

MrChips

Joined Oct 2, 2009
34,700
Wow that's amazing !
Thanks a lot!
I'm not experienced in troubleshooting PCP's. Do you think if I change these two there is a big change it will work?
I am going to guess no.
These are DC-DC converters to provide power to the board. If they are both blown, then there are reasons for them blowing, which is that there is a short or multiple shorts elsewhere on the board.

The other possibility is that the wrong power adapter was plugged into the unit and it blew both ICs.
 

sagor

Joined Mar 10, 2019
1,049
I read it as a possible AJL part, due to the small tail to the right of the print at the bottom of the first picture. Not sure if that is correct or not, second picture does not show that tail...
 
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