Hello,
I hope someone can help me. The ADD1L comes from an oscilloscope and is part of the power supply (U31).
Unfortunately, ADD1L cannot be found on the Internet.
Thank you for your support!
Chris
Hi @DeepSpace6 ,
It seems to be a buck regulator in SOT23-5 package. The PCB layout suggests that the pin 3 is the switch output, pin 2 is GND, pin 5 is feedback and pin 4 is Vin. Pin 1 could be enable or something. The reference voltage is apparently 0.6V.
One bet for this with marking ADD1L is RY3420 by RYCHIP.
But, I’d dare to say you could replace it with any buck with identical pin-out, reference voltage and switching frequency, for example
Cheers, heke
BTW the LDO AM51117 seems to be damaged as well.
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Hello,
thanks for the quick reply. The LDO AM51117 has no problem. It only has a splash of flux on it. I was able to remove it. I’ll give it a try with the suggested regulator.
Thanks until then!
Christof
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Hi @DeepSpace6 Christof,
OK 
Give a try with the replacement and let the forum know how it goes.
Cheers, heke
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